forked from KolibriOS/kolibrios
2741 lines
73 KiB
C
2741 lines
73 KiB
C
/*
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* Copyright © 2014 Red Hat
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*
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* Permission to use, copy, modify, distribute, and sell this software and its
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* documentation for any purpose is hereby granted without fee, provided that
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* the above copyright notice appear in all copies and that both that copyright
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* notice and this permission notice appear in supporting documentation, and
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* that the name of the copyright holders not be used in advertising or
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* publicity pertaining to distribution of the software without specific,
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* written prior permission. The copyright holders make no representations
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* about the suitability of this software for any purpose. It is provided "as
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* is" without express or implied warranty.
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*
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* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
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* EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
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* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
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* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
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* OF THIS SOFTWARE.
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*/
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#include <linux/kernel.h>
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#include <linux/mutex.h>
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#include <linux/kref.h>
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#include <linux/wait.h>
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#include <linux/workqueue.h>
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#include <linux/delay.h>
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#include <linux/errno.h>
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#include <linux/sched.h>
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#include <linux/seq_file.h>
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#include <linux/i2c.h>
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#include <drm/drm_dp_mst_helper.h>
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#include <drm/drmP.h>
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#include <drm/drm_fixed.h>
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u64 get_jiffies_64(void)
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{
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return jiffies;
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}
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/**
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* DOC: dp mst helper
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*
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* These functions contain parts of the DisplayPort 1.2a MultiStream Transport
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* protocol. The helpers contain a topology manager and bandwidth manager.
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* The helpers encapsulate the sending and received of sideband msgs.
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*/
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static bool dump_dp_payload_table(struct drm_dp_mst_topology_mgr *mgr,
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char *buf);
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static int test_calc_pbn_mode(void);
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static void drm_dp_put_port(struct drm_dp_mst_port *port);
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static int drm_dp_dpcd_write_payload(struct drm_dp_mst_topology_mgr *mgr,
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int id,
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struct drm_dp_payload *payload);
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static int drm_dp_send_dpcd_write(struct drm_dp_mst_topology_mgr *mgr,
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struct drm_dp_mst_port *port,
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int offset, int size, u8 *bytes);
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static int drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr,
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struct drm_dp_mst_branch *mstb);
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static int drm_dp_send_enum_path_resources(struct drm_dp_mst_topology_mgr *mgr,
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struct drm_dp_mst_branch *mstb,
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struct drm_dp_mst_port *port);
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static bool drm_dp_validate_guid(struct drm_dp_mst_topology_mgr *mgr,
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u8 *guid);
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static int drm_dp_mst_register_i2c_bus(struct drm_dp_aux *aux);
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static void drm_dp_mst_unregister_i2c_bus(struct drm_dp_aux *aux);
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static void drm_dp_mst_kick_tx(struct drm_dp_mst_topology_mgr *mgr);
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/* sideband msg handling */
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static u8 drm_dp_msg_header_crc4(const uint8_t *data, size_t num_nibbles)
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{
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u8 bitmask = 0x80;
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u8 bitshift = 7;
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u8 array_index = 0;
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int number_of_bits = num_nibbles * 4;
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u8 remainder = 0;
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while (number_of_bits != 0) {
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number_of_bits--;
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remainder <<= 1;
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remainder |= (data[array_index] & bitmask) >> bitshift;
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bitmask >>= 1;
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bitshift--;
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if (bitmask == 0) {
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bitmask = 0x80;
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bitshift = 7;
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array_index++;
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}
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if ((remainder & 0x10) == 0x10)
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remainder ^= 0x13;
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}
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number_of_bits = 4;
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while (number_of_bits != 0) {
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number_of_bits--;
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remainder <<= 1;
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if ((remainder & 0x10) != 0)
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remainder ^= 0x13;
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}
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return remainder;
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}
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static u8 drm_dp_msg_data_crc4(const uint8_t *data, u8 number_of_bytes)
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{
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u8 bitmask = 0x80;
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u8 bitshift = 7;
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u8 array_index = 0;
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int number_of_bits = number_of_bytes * 8;
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u16 remainder = 0;
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while (number_of_bits != 0) {
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number_of_bits--;
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remainder <<= 1;
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remainder |= (data[array_index] & bitmask) >> bitshift;
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bitmask >>= 1;
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bitshift--;
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if (bitmask == 0) {
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bitmask = 0x80;
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bitshift = 7;
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array_index++;
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}
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if ((remainder & 0x100) == 0x100)
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remainder ^= 0xd5;
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}
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number_of_bits = 8;
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while (number_of_bits != 0) {
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number_of_bits--;
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remainder <<= 1;
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if ((remainder & 0x100) != 0)
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remainder ^= 0xd5;
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}
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return remainder & 0xff;
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}
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static inline u8 drm_dp_calc_sb_hdr_size(struct drm_dp_sideband_msg_hdr *hdr)
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{
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u8 size = 3;
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size += (hdr->lct / 2);
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return size;
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}
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static void drm_dp_encode_sideband_msg_hdr(struct drm_dp_sideband_msg_hdr *hdr,
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u8 *buf, int *len)
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{
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int idx = 0;
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int i;
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u8 crc4;
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buf[idx++] = ((hdr->lct & 0xf) << 4) | (hdr->lcr & 0xf);
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for (i = 0; i < (hdr->lct / 2); i++)
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buf[idx++] = hdr->rad[i];
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buf[idx++] = (hdr->broadcast << 7) | (hdr->path_msg << 6) |
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(hdr->msg_len & 0x3f);
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buf[idx++] = (hdr->somt << 7) | (hdr->eomt << 6) | (hdr->seqno << 4);
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crc4 = drm_dp_msg_header_crc4(buf, (idx * 2) - 1);
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buf[idx - 1] |= (crc4 & 0xf);
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*len = idx;
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}
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static bool drm_dp_decode_sideband_msg_hdr(struct drm_dp_sideband_msg_hdr *hdr,
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u8 *buf, int buflen, u8 *hdrlen)
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{
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u8 crc4;
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u8 len;
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int i;
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u8 idx;
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if (buf[0] == 0)
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return false;
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len = 3;
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len += ((buf[0] & 0xf0) >> 4) / 2;
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if (len > buflen)
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return false;
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crc4 = drm_dp_msg_header_crc4(buf, (len * 2) - 1);
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if ((crc4 & 0xf) != (buf[len - 1] & 0xf)) {
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DRM_DEBUG_KMS("crc4 mismatch 0x%x 0x%x\n", crc4, buf[len - 1]);
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return false;
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}
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hdr->lct = (buf[0] & 0xf0) >> 4;
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hdr->lcr = (buf[0] & 0xf);
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idx = 1;
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for (i = 0; i < (hdr->lct / 2); i++)
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hdr->rad[i] = buf[idx++];
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hdr->broadcast = (buf[idx] >> 7) & 0x1;
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hdr->path_msg = (buf[idx] >> 6) & 0x1;
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hdr->msg_len = buf[idx] & 0x3f;
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idx++;
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hdr->somt = (buf[idx] >> 7) & 0x1;
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hdr->eomt = (buf[idx] >> 6) & 0x1;
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hdr->seqno = (buf[idx] >> 4) & 0x1;
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idx++;
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*hdrlen = idx;
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return true;
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}
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static void drm_dp_encode_sideband_req(struct drm_dp_sideband_msg_req_body *req,
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struct drm_dp_sideband_msg_tx *raw)
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{
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int idx = 0;
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int i;
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u8 *buf = raw->msg;
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buf[idx++] = req->req_type & 0x7f;
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switch (req->req_type) {
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case DP_ENUM_PATH_RESOURCES:
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buf[idx] = (req->u.port_num.port_number & 0xf) << 4;
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idx++;
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break;
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case DP_ALLOCATE_PAYLOAD:
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buf[idx] = (req->u.allocate_payload.port_number & 0xf) << 4 |
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(req->u.allocate_payload.number_sdp_streams & 0xf);
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idx++;
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buf[idx] = (req->u.allocate_payload.vcpi & 0x7f);
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idx++;
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buf[idx] = (req->u.allocate_payload.pbn >> 8);
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idx++;
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buf[idx] = (req->u.allocate_payload.pbn & 0xff);
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idx++;
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for (i = 0; i < req->u.allocate_payload.number_sdp_streams / 2; i++) {
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buf[idx] = ((req->u.allocate_payload.sdp_stream_sink[i * 2] & 0xf) << 4) |
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(req->u.allocate_payload.sdp_stream_sink[i * 2 + 1] & 0xf);
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idx++;
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}
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if (req->u.allocate_payload.number_sdp_streams & 1) {
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i = req->u.allocate_payload.number_sdp_streams - 1;
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buf[idx] = (req->u.allocate_payload.sdp_stream_sink[i] & 0xf) << 4;
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idx++;
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}
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break;
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case DP_QUERY_PAYLOAD:
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buf[idx] = (req->u.query_payload.port_number & 0xf) << 4;
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idx++;
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buf[idx] = (req->u.query_payload.vcpi & 0x7f);
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idx++;
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break;
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case DP_REMOTE_DPCD_READ:
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buf[idx] = (req->u.dpcd_read.port_number & 0xf) << 4;
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buf[idx] |= ((req->u.dpcd_read.dpcd_address & 0xf0000) >> 16) & 0xf;
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idx++;
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buf[idx] = (req->u.dpcd_read.dpcd_address & 0xff00) >> 8;
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idx++;
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buf[idx] = (req->u.dpcd_read.dpcd_address & 0xff);
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idx++;
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buf[idx] = (req->u.dpcd_read.num_bytes);
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idx++;
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break;
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case DP_REMOTE_DPCD_WRITE:
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buf[idx] = (req->u.dpcd_write.port_number & 0xf) << 4;
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buf[idx] |= ((req->u.dpcd_write.dpcd_address & 0xf0000) >> 16) & 0xf;
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idx++;
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buf[idx] = (req->u.dpcd_write.dpcd_address & 0xff00) >> 8;
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idx++;
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buf[idx] = (req->u.dpcd_write.dpcd_address & 0xff);
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idx++;
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buf[idx] = (req->u.dpcd_write.num_bytes);
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idx++;
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memcpy(&buf[idx], req->u.dpcd_write.bytes, req->u.dpcd_write.num_bytes);
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idx += req->u.dpcd_write.num_bytes;
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break;
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case DP_REMOTE_I2C_READ:
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buf[idx] = (req->u.i2c_read.port_number & 0xf) << 4;
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buf[idx] |= (req->u.i2c_read.num_transactions & 0x3);
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idx++;
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for (i = 0; i < (req->u.i2c_read.num_transactions & 0x3); i++) {
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buf[idx] = req->u.i2c_read.transactions[i].i2c_dev_id & 0x7f;
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idx++;
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buf[idx] = req->u.i2c_read.transactions[i].num_bytes;
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idx++;
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memcpy(&buf[idx], req->u.i2c_read.transactions[i].bytes, req->u.i2c_read.transactions[i].num_bytes);
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idx += req->u.i2c_read.transactions[i].num_bytes;
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buf[idx] = (req->u.i2c_read.transactions[i].no_stop_bit & 0x1) << 5;
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buf[idx] |= (req->u.i2c_read.transactions[i].i2c_transaction_delay & 0xf);
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idx++;
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}
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buf[idx] = (req->u.i2c_read.read_i2c_device_id) & 0x7f;
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idx++;
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buf[idx] = (req->u.i2c_read.num_bytes_read);
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idx++;
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break;
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case DP_REMOTE_I2C_WRITE:
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buf[idx] = (req->u.i2c_write.port_number & 0xf) << 4;
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idx++;
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buf[idx] = (req->u.i2c_write.write_i2c_device_id) & 0x7f;
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idx++;
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buf[idx] = (req->u.i2c_write.num_bytes);
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idx++;
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memcpy(&buf[idx], req->u.i2c_write.bytes, req->u.i2c_write.num_bytes);
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idx += req->u.i2c_write.num_bytes;
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break;
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}
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raw->cur_len = idx;
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}
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static void drm_dp_crc_sideband_chunk_req(u8 *msg, u8 len)
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{
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u8 crc4;
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crc4 = drm_dp_msg_data_crc4(msg, len);
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msg[len] = crc4;
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}
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static void drm_dp_encode_sideband_reply(struct drm_dp_sideband_msg_reply_body *rep,
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struct drm_dp_sideband_msg_tx *raw)
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{
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int idx = 0;
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u8 *buf = raw->msg;
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buf[idx++] = (rep->reply_type & 0x1) << 7 | (rep->req_type & 0x7f);
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raw->cur_len = idx;
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}
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/* this adds a chunk of msg to the builder to get the final msg */
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static bool drm_dp_sideband_msg_build(struct drm_dp_sideband_msg_rx *msg,
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u8 *replybuf, u8 replybuflen, bool hdr)
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{
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int ret;
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u8 crc4;
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if (hdr) {
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u8 hdrlen;
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struct drm_dp_sideband_msg_hdr recv_hdr;
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ret = drm_dp_decode_sideband_msg_hdr(&recv_hdr, replybuf, replybuflen, &hdrlen);
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if (ret == false) {
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print_hex_dump(KERN_DEBUG, "failed hdr", DUMP_PREFIX_NONE, 16, 1, replybuf, replybuflen, false);
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return false;
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}
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/* get length contained in this portion */
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msg->curchunk_len = recv_hdr.msg_len;
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msg->curchunk_hdrlen = hdrlen;
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/* we have already gotten an somt - don't bother parsing */
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if (recv_hdr.somt && msg->have_somt)
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return false;
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if (recv_hdr.somt) {
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memcpy(&msg->initial_hdr, &recv_hdr, sizeof(struct drm_dp_sideband_msg_hdr));
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msg->have_somt = true;
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}
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if (recv_hdr.eomt)
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msg->have_eomt = true;
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/* copy the bytes for the remainder of this header chunk */
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msg->curchunk_idx = min(msg->curchunk_len, (u8)(replybuflen - hdrlen));
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memcpy(&msg->chunk[0], replybuf + hdrlen, msg->curchunk_idx);
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} else {
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memcpy(&msg->chunk[msg->curchunk_idx], replybuf, replybuflen);
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msg->curchunk_idx += replybuflen;
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}
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if (msg->curchunk_idx >= msg->curchunk_len) {
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/* do CRC */
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crc4 = drm_dp_msg_data_crc4(msg->chunk, msg->curchunk_len - 1);
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/* copy chunk into bigger msg */
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memcpy(&msg->msg[msg->curlen], msg->chunk, msg->curchunk_len - 1);
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msg->curlen += msg->curchunk_len - 1;
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}
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return true;
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}
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|
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static bool drm_dp_sideband_parse_link_address(struct drm_dp_sideband_msg_rx *raw,
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struct drm_dp_sideband_msg_reply_body *repmsg)
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{
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int idx = 1;
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int i;
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memcpy(repmsg->u.link_addr.guid, &raw->msg[idx], 16);
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idx += 16;
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repmsg->u.link_addr.nports = raw->msg[idx] & 0xf;
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idx++;
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if (idx > raw->curlen)
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goto fail_len;
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for (i = 0; i < repmsg->u.link_addr.nports; i++) {
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if (raw->msg[idx] & 0x80)
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repmsg->u.link_addr.ports[i].input_port = 1;
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|
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repmsg->u.link_addr.ports[i].peer_device_type = (raw->msg[idx] >> 4) & 0x7;
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repmsg->u.link_addr.ports[i].port_number = (raw->msg[idx] & 0xf);
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idx++;
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if (idx > raw->curlen)
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goto fail_len;
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repmsg->u.link_addr.ports[i].mcs = (raw->msg[idx] >> 7) & 0x1;
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repmsg->u.link_addr.ports[i].ddps = (raw->msg[idx] >> 6) & 0x1;
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if (repmsg->u.link_addr.ports[i].input_port == 0)
|
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repmsg->u.link_addr.ports[i].legacy_device_plug_status = (raw->msg[idx] >> 5) & 0x1;
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idx++;
|
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if (idx > raw->curlen)
|
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goto fail_len;
|
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if (repmsg->u.link_addr.ports[i].input_port == 0) {
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repmsg->u.link_addr.ports[i].dpcd_revision = (raw->msg[idx]);
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idx++;
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if (idx > raw->curlen)
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goto fail_len;
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memcpy(repmsg->u.link_addr.ports[i].peer_guid, &raw->msg[idx], 16);
|
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idx += 16;
|
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if (idx > raw->curlen)
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goto fail_len;
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repmsg->u.link_addr.ports[i].num_sdp_streams = (raw->msg[idx] >> 4) & 0xf;
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repmsg->u.link_addr.ports[i].num_sdp_stream_sinks = (raw->msg[idx] & 0xf);
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idx++;
|
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|
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}
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if (idx > raw->curlen)
|
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goto fail_len;
|
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}
|
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|
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return true;
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|
fail_len:
|
|
DRM_DEBUG_KMS("link address reply parse length fail %d %d\n", idx, raw->curlen);
|
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return false;
|
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}
|
|
|
|
static bool drm_dp_sideband_parse_remote_dpcd_read(struct drm_dp_sideband_msg_rx *raw,
|
|
struct drm_dp_sideband_msg_reply_body *repmsg)
|
|
{
|
|
int idx = 1;
|
|
repmsg->u.remote_dpcd_read_ack.port_number = raw->msg[idx] & 0xf;
|
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idx++;
|
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if (idx > raw->curlen)
|
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goto fail_len;
|
|
repmsg->u.remote_dpcd_read_ack.num_bytes = raw->msg[idx];
|
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if (idx > raw->curlen)
|
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goto fail_len;
|
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|
|
memcpy(repmsg->u.remote_dpcd_read_ack.bytes, &raw->msg[idx], repmsg->u.remote_dpcd_read_ack.num_bytes);
|
|
return true;
|
|
fail_len:
|
|
DRM_DEBUG_KMS("link address reply parse length fail %d %d\n", idx, raw->curlen);
|
|
return false;
|
|
}
|
|
|
|
static bool drm_dp_sideband_parse_remote_dpcd_write(struct drm_dp_sideband_msg_rx *raw,
|
|
struct drm_dp_sideband_msg_reply_body *repmsg)
|
|
{
|
|
int idx = 1;
|
|
repmsg->u.remote_dpcd_write_ack.port_number = raw->msg[idx] & 0xf;
|
|
idx++;
|
|
if (idx > raw->curlen)
|
|
goto fail_len;
|
|
return true;
|
|
fail_len:
|
|
DRM_DEBUG_KMS("parse length fail %d %d\n", idx, raw->curlen);
|
|
return false;
|
|
}
|
|
|
|
static bool drm_dp_sideband_parse_remote_i2c_read_ack(struct drm_dp_sideband_msg_rx *raw,
|
|
struct drm_dp_sideband_msg_reply_body *repmsg)
|
|
{
|
|
int idx = 1;
|
|
|
|
repmsg->u.remote_i2c_read_ack.port_number = (raw->msg[idx] & 0xf);
|
|
idx++;
|
|
if (idx > raw->curlen)
|
|
goto fail_len;
|
|
repmsg->u.remote_i2c_read_ack.num_bytes = raw->msg[idx];
|
|
idx++;
|
|
/* TODO check */
|
|
memcpy(repmsg->u.remote_i2c_read_ack.bytes, &raw->msg[idx], repmsg->u.remote_i2c_read_ack.num_bytes);
|
|
return true;
|
|
fail_len:
|
|
DRM_DEBUG_KMS("remote i2c reply parse length fail %d %d\n", idx, raw->curlen);
|
|
return false;
|
|
}
|
|
|
|
static bool drm_dp_sideband_parse_enum_path_resources_ack(struct drm_dp_sideband_msg_rx *raw,
|
|
struct drm_dp_sideband_msg_reply_body *repmsg)
|
|
{
|
|
int idx = 1;
|
|
repmsg->u.path_resources.port_number = (raw->msg[idx] >> 4) & 0xf;
|
|
idx++;
|
|
if (idx > raw->curlen)
|
|
goto fail_len;
|
|
repmsg->u.path_resources.full_payload_bw_number = (raw->msg[idx] << 8) | (raw->msg[idx+1]);
|
|
idx += 2;
|
|
if (idx > raw->curlen)
|
|
goto fail_len;
|
|
repmsg->u.path_resources.avail_payload_bw_number = (raw->msg[idx] << 8) | (raw->msg[idx+1]);
|
|
idx += 2;
|
|
if (idx > raw->curlen)
|
|
goto fail_len;
|
|
return true;
|
|
fail_len:
|
|
DRM_DEBUG_KMS("enum resource parse length fail %d %d\n", idx, raw->curlen);
|
|
return false;
|
|
}
|
|
|
|
static bool drm_dp_sideband_parse_allocate_payload_ack(struct drm_dp_sideband_msg_rx *raw,
|
|
struct drm_dp_sideband_msg_reply_body *repmsg)
|
|
{
|
|
int idx = 1;
|
|
repmsg->u.allocate_payload.port_number = (raw->msg[idx] >> 4) & 0xf;
|
|
idx++;
|
|
if (idx > raw->curlen)
|
|
goto fail_len;
|
|
repmsg->u.allocate_payload.vcpi = raw->msg[idx];
|
|
idx++;
|
|
if (idx > raw->curlen)
|
|
goto fail_len;
|
|
repmsg->u.allocate_payload.allocated_pbn = (raw->msg[idx] << 8) | (raw->msg[idx+1]);
|
|
idx += 2;
|
|
if (idx > raw->curlen)
|
|
goto fail_len;
|
|
return true;
|
|
fail_len:
|
|
DRM_DEBUG_KMS("allocate payload parse length fail %d %d\n", idx, raw->curlen);
|
|
return false;
|
|
}
|
|
|
|
static bool drm_dp_sideband_parse_query_payload_ack(struct drm_dp_sideband_msg_rx *raw,
|
|
struct drm_dp_sideband_msg_reply_body *repmsg)
|
|
{
|
|
int idx = 1;
|
|
repmsg->u.query_payload.port_number = (raw->msg[idx] >> 4) & 0xf;
|
|
idx++;
|
|
if (idx > raw->curlen)
|
|
goto fail_len;
|
|
repmsg->u.query_payload.allocated_pbn = (raw->msg[idx] << 8) | (raw->msg[idx + 1]);
|
|
idx += 2;
|
|
if (idx > raw->curlen)
|
|
goto fail_len;
|
|
return true;
|
|
fail_len:
|
|
DRM_DEBUG_KMS("query payload parse length fail %d %d\n", idx, raw->curlen);
|
|
return false;
|
|
}
|
|
|
|
static bool drm_dp_sideband_parse_reply(struct drm_dp_sideband_msg_rx *raw,
|
|
struct drm_dp_sideband_msg_reply_body *msg)
|
|
{
|
|
memset(msg, 0, sizeof(*msg));
|
|
msg->reply_type = (raw->msg[0] & 0x80) >> 7;
|
|
msg->req_type = (raw->msg[0] & 0x7f);
|
|
|
|
if (msg->reply_type) {
|
|
memcpy(msg->u.nak.guid, &raw->msg[1], 16);
|
|
msg->u.nak.reason = raw->msg[17];
|
|
msg->u.nak.nak_data = raw->msg[18];
|
|
return false;
|
|
}
|
|
|
|
switch (msg->req_type) {
|
|
case DP_LINK_ADDRESS:
|
|
return drm_dp_sideband_parse_link_address(raw, msg);
|
|
case DP_QUERY_PAYLOAD:
|
|
return drm_dp_sideband_parse_query_payload_ack(raw, msg);
|
|
case DP_REMOTE_DPCD_READ:
|
|
return drm_dp_sideband_parse_remote_dpcd_read(raw, msg);
|
|
case DP_REMOTE_DPCD_WRITE:
|
|
return drm_dp_sideband_parse_remote_dpcd_write(raw, msg);
|
|
case DP_REMOTE_I2C_READ:
|
|
return drm_dp_sideband_parse_remote_i2c_read_ack(raw, msg);
|
|
case DP_ENUM_PATH_RESOURCES:
|
|
return drm_dp_sideband_parse_enum_path_resources_ack(raw, msg);
|
|
case DP_ALLOCATE_PAYLOAD:
|
|
return drm_dp_sideband_parse_allocate_payload_ack(raw, msg);
|
|
default:
|
|
DRM_ERROR("Got unknown reply 0x%02x\n", msg->req_type);
|
|
return false;
|
|
}
|
|
}
|
|
|
|
static bool drm_dp_sideband_parse_connection_status_notify(struct drm_dp_sideband_msg_rx *raw,
|
|
struct drm_dp_sideband_msg_req_body *msg)
|
|
{
|
|
int idx = 1;
|
|
|
|
msg->u.conn_stat.port_number = (raw->msg[idx] & 0xf0) >> 4;
|
|
idx++;
|
|
if (idx > raw->curlen)
|
|
goto fail_len;
|
|
|
|
memcpy(msg->u.conn_stat.guid, &raw->msg[idx], 16);
|
|
idx += 16;
|
|
if (idx > raw->curlen)
|
|
goto fail_len;
|
|
|
|
msg->u.conn_stat.legacy_device_plug_status = (raw->msg[idx] >> 6) & 0x1;
|
|
msg->u.conn_stat.displayport_device_plug_status = (raw->msg[idx] >> 5) & 0x1;
|
|
msg->u.conn_stat.message_capability_status = (raw->msg[idx] >> 4) & 0x1;
|
|
msg->u.conn_stat.input_port = (raw->msg[idx] >> 3) & 0x1;
|
|
msg->u.conn_stat.peer_device_type = (raw->msg[idx] & 0x7);
|
|
idx++;
|
|
return true;
|
|
fail_len:
|
|
DRM_DEBUG_KMS("connection status reply parse length fail %d %d\n", idx, raw->curlen);
|
|
return false;
|
|
}
|
|
|
|
static bool drm_dp_sideband_parse_resource_status_notify(struct drm_dp_sideband_msg_rx *raw,
|
|
struct drm_dp_sideband_msg_req_body *msg)
|
|
{
|
|
int idx = 1;
|
|
|
|
msg->u.resource_stat.port_number = (raw->msg[idx] & 0xf0) >> 4;
|
|
idx++;
|
|
if (idx > raw->curlen)
|
|
goto fail_len;
|
|
|
|
memcpy(msg->u.resource_stat.guid, &raw->msg[idx], 16);
|
|
idx += 16;
|
|
if (idx > raw->curlen)
|
|
goto fail_len;
|
|
|
|
msg->u.resource_stat.available_pbn = (raw->msg[idx] << 8) | (raw->msg[idx + 1]);
|
|
idx++;
|
|
return true;
|
|
fail_len:
|
|
DRM_DEBUG_KMS("resource status reply parse length fail %d %d\n", idx, raw->curlen);
|
|
return false;
|
|
}
|
|
|
|
static bool drm_dp_sideband_parse_req(struct drm_dp_sideband_msg_rx *raw,
|
|
struct drm_dp_sideband_msg_req_body *msg)
|
|
{
|
|
memset(msg, 0, sizeof(*msg));
|
|
msg->req_type = (raw->msg[0] & 0x7f);
|
|
|
|
switch (msg->req_type) {
|
|
case DP_CONNECTION_STATUS_NOTIFY:
|
|
return drm_dp_sideband_parse_connection_status_notify(raw, msg);
|
|
case DP_RESOURCE_STATUS_NOTIFY:
|
|
return drm_dp_sideband_parse_resource_status_notify(raw, msg);
|
|
default:
|
|
DRM_ERROR("Got unknown request 0x%02x\n", msg->req_type);
|
|
return false;
|
|
}
|
|
}
|
|
|
|
static int build_dpcd_write(struct drm_dp_sideband_msg_tx *msg, u8 port_num, u32 offset, u8 num_bytes, u8 *bytes)
|
|
{
|
|
struct drm_dp_sideband_msg_req_body req;
|
|
|
|
req.req_type = DP_REMOTE_DPCD_WRITE;
|
|
req.u.dpcd_write.port_number = port_num;
|
|
req.u.dpcd_write.dpcd_address = offset;
|
|
req.u.dpcd_write.num_bytes = num_bytes;
|
|
req.u.dpcd_write.bytes = bytes;
|
|
drm_dp_encode_sideband_req(&req, msg);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int build_link_address(struct drm_dp_sideband_msg_tx *msg)
|
|
{
|
|
struct drm_dp_sideband_msg_req_body req;
|
|
|
|
req.req_type = DP_LINK_ADDRESS;
|
|
drm_dp_encode_sideband_req(&req, msg);
|
|
return 0;
|
|
}
|
|
|
|
static int build_enum_path_resources(struct drm_dp_sideband_msg_tx *msg, int port_num)
|
|
{
|
|
struct drm_dp_sideband_msg_req_body req;
|
|
|
|
req.req_type = DP_ENUM_PATH_RESOURCES;
|
|
req.u.port_num.port_number = port_num;
|
|
drm_dp_encode_sideband_req(&req, msg);
|
|
msg->path_msg = true;
|
|
return 0;
|
|
}
|
|
|
|
static int build_allocate_payload(struct drm_dp_sideband_msg_tx *msg, int port_num,
|
|
u8 vcpi, uint16_t pbn)
|
|
{
|
|
struct drm_dp_sideband_msg_req_body req;
|
|
memset(&req, 0, sizeof(req));
|
|
req.req_type = DP_ALLOCATE_PAYLOAD;
|
|
req.u.allocate_payload.port_number = port_num;
|
|
req.u.allocate_payload.vcpi = vcpi;
|
|
req.u.allocate_payload.pbn = pbn;
|
|
drm_dp_encode_sideband_req(&req, msg);
|
|
msg->path_msg = true;
|
|
return 0;
|
|
}
|
|
|
|
static int drm_dp_mst_assign_payload_id(struct drm_dp_mst_topology_mgr *mgr,
|
|
struct drm_dp_vcpi *vcpi)
|
|
{
|
|
int ret, vcpi_ret;
|
|
|
|
mutex_lock(&mgr->payload_lock);
|
|
ret = find_first_zero_bit(&mgr->payload_mask, mgr->max_payloads + 1);
|
|
if (ret > mgr->max_payloads) {
|
|
ret = -EINVAL;
|
|
DRM_DEBUG_KMS("out of payload ids %d\n", ret);
|
|
goto out_unlock;
|
|
}
|
|
|
|
vcpi_ret = find_first_zero_bit(&mgr->vcpi_mask, mgr->max_payloads + 1);
|
|
if (vcpi_ret > mgr->max_payloads) {
|
|
ret = -EINVAL;
|
|
DRM_DEBUG_KMS("out of vcpi ids %d\n", ret);
|
|
goto out_unlock;
|
|
}
|
|
|
|
set_bit(ret, &mgr->payload_mask);
|
|
set_bit(vcpi_ret, &mgr->vcpi_mask);
|
|
vcpi->vcpi = vcpi_ret + 1;
|
|
mgr->proposed_vcpis[ret - 1] = vcpi;
|
|
out_unlock:
|
|
mutex_unlock(&mgr->payload_lock);
|
|
return ret;
|
|
}
|
|
|
|
static void drm_dp_mst_put_payload_id(struct drm_dp_mst_topology_mgr *mgr,
|
|
int vcpi)
|
|
{
|
|
int i;
|
|
if (vcpi == 0)
|
|
return;
|
|
|
|
mutex_lock(&mgr->payload_lock);
|
|
DRM_DEBUG_KMS("putting payload %d\n", vcpi);
|
|
clear_bit(vcpi - 1, &mgr->vcpi_mask);
|
|
|
|
for (i = 0; i < mgr->max_payloads; i++) {
|
|
if (mgr->proposed_vcpis[i])
|
|
if (mgr->proposed_vcpis[i]->vcpi == vcpi) {
|
|
mgr->proposed_vcpis[i] = NULL;
|
|
clear_bit(i + 1, &mgr->payload_mask);
|
|
}
|
|
}
|
|
mutex_unlock(&mgr->payload_lock);
|
|
}
|
|
|
|
static bool check_txmsg_state(struct drm_dp_mst_topology_mgr *mgr,
|
|
struct drm_dp_sideband_msg_tx *txmsg)
|
|
{
|
|
bool ret;
|
|
mutex_lock(&mgr->qlock);
|
|
ret = (txmsg->state == DRM_DP_SIDEBAND_TX_RX ||
|
|
txmsg->state == DRM_DP_SIDEBAND_TX_TIMEOUT);
|
|
mutex_unlock(&mgr->qlock);
|
|
return ret;
|
|
}
|
|
|
|
static int drm_dp_mst_wait_tx_reply(struct drm_dp_mst_branch *mstb,
|
|
struct drm_dp_sideband_msg_tx *txmsg)
|
|
{
|
|
struct drm_dp_mst_topology_mgr *mgr = mstb->mgr;
|
|
int ret;
|
|
|
|
ret = wait_event_timeout(mgr->tx_waitq,
|
|
check_txmsg_state(mgr, txmsg),
|
|
(4 * HZ));
|
|
mutex_lock(&mstb->mgr->qlock);
|
|
if (ret > 0) {
|
|
if (txmsg->state == DRM_DP_SIDEBAND_TX_TIMEOUT) {
|
|
ret = -EIO;
|
|
goto out;
|
|
}
|
|
} else {
|
|
DRM_DEBUG_KMS("timedout msg send %p %d %d\n", txmsg, txmsg->state, txmsg->seqno);
|
|
|
|
/* dump some state */
|
|
ret = -EIO;
|
|
|
|
/* remove from q */
|
|
if (txmsg->state == DRM_DP_SIDEBAND_TX_QUEUED ||
|
|
txmsg->state == DRM_DP_SIDEBAND_TX_START_SEND) {
|
|
list_del(&txmsg->next);
|
|
}
|
|
|
|
if (txmsg->state == DRM_DP_SIDEBAND_TX_START_SEND ||
|
|
txmsg->state == DRM_DP_SIDEBAND_TX_SENT) {
|
|
mstb->tx_slots[txmsg->seqno] = NULL;
|
|
}
|
|
}
|
|
out:
|
|
mutex_unlock(&mgr->qlock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static struct drm_dp_mst_branch *drm_dp_add_mst_branch_device(u8 lct, u8 *rad)
|
|
{
|
|
struct drm_dp_mst_branch *mstb;
|
|
|
|
mstb = kzalloc(sizeof(*mstb), GFP_KERNEL);
|
|
if (!mstb)
|
|
return NULL;
|
|
|
|
mstb->lct = lct;
|
|
if (lct > 1)
|
|
memcpy(mstb->rad, rad, lct / 2);
|
|
INIT_LIST_HEAD(&mstb->ports);
|
|
kref_init(&mstb->kref);
|
|
return mstb;
|
|
}
|
|
|
|
static void drm_dp_destroy_mst_branch_device(struct kref *kref)
|
|
{
|
|
struct drm_dp_mst_branch *mstb = container_of(kref, struct drm_dp_mst_branch, kref);
|
|
struct drm_dp_mst_port *port, *tmp;
|
|
bool wake_tx = false;
|
|
|
|
cancel_work_sync(&mstb->mgr->work);
|
|
|
|
/*
|
|
* destroy all ports - don't need lock
|
|
* as there are no more references to the mst branch
|
|
* device at this point.
|
|
*/
|
|
list_for_each_entry_safe(port, tmp, &mstb->ports, next) {
|
|
list_del(&port->next);
|
|
drm_dp_put_port(port);
|
|
}
|
|
|
|
/* drop any tx slots msg */
|
|
mutex_lock(&mstb->mgr->qlock);
|
|
if (mstb->tx_slots[0]) {
|
|
mstb->tx_slots[0]->state = DRM_DP_SIDEBAND_TX_TIMEOUT;
|
|
mstb->tx_slots[0] = NULL;
|
|
wake_tx = true;
|
|
}
|
|
if (mstb->tx_slots[1]) {
|
|
mstb->tx_slots[1]->state = DRM_DP_SIDEBAND_TX_TIMEOUT;
|
|
mstb->tx_slots[1] = NULL;
|
|
wake_tx = true;
|
|
}
|
|
mutex_unlock(&mstb->mgr->qlock);
|
|
|
|
// if (wake_tx)
|
|
// wake_up(&mstb->mgr->tx_waitq);
|
|
kfree(mstb);
|
|
}
|
|
|
|
static void drm_dp_put_mst_branch_device(struct drm_dp_mst_branch *mstb)
|
|
{
|
|
kref_put(&mstb->kref, drm_dp_destroy_mst_branch_device);
|
|
}
|
|
|
|
|
|
static void drm_dp_port_teardown_pdt(struct drm_dp_mst_port *port, int old_pdt)
|
|
{
|
|
struct drm_dp_mst_branch *mstb;
|
|
|
|
switch (old_pdt) {
|
|
case DP_PEER_DEVICE_DP_LEGACY_CONV:
|
|
case DP_PEER_DEVICE_SST_SINK:
|
|
/* remove i2c over sideband */
|
|
drm_dp_mst_unregister_i2c_bus(&port->aux);
|
|
break;
|
|
case DP_PEER_DEVICE_MST_BRANCHING:
|
|
mstb = port->mstb;
|
|
port->mstb = NULL;
|
|
drm_dp_put_mst_branch_device(mstb);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void drm_dp_destroy_port(struct kref *kref)
|
|
{
|
|
struct drm_dp_mst_port *port = container_of(kref, struct drm_dp_mst_port, kref);
|
|
struct drm_dp_mst_topology_mgr *mgr = port->mgr;
|
|
if (!port->input) {
|
|
port->vcpi.num_slots = 0;
|
|
|
|
kfree(port->cached_edid);
|
|
if (port->connector)
|
|
(*port->mgr->cbs->destroy_connector)(mgr, port->connector);
|
|
drm_dp_port_teardown_pdt(port, port->pdt);
|
|
|
|
if (!port->input && port->vcpi.vcpi > 0)
|
|
drm_dp_mst_put_payload_id(mgr, port->vcpi.vcpi);
|
|
}
|
|
kfree(port);
|
|
|
|
(*mgr->cbs->hotplug)(mgr);
|
|
}
|
|
|
|
static void drm_dp_put_port(struct drm_dp_mst_port *port)
|
|
{
|
|
kref_put(&port->kref, drm_dp_destroy_port);
|
|
}
|
|
|
|
static struct drm_dp_mst_branch *drm_dp_mst_get_validated_mstb_ref_locked(struct drm_dp_mst_branch *mstb, struct drm_dp_mst_branch *to_find)
|
|
{
|
|
struct drm_dp_mst_port *port;
|
|
struct drm_dp_mst_branch *rmstb;
|
|
if (to_find == mstb) {
|
|
kref_get(&mstb->kref);
|
|
return mstb;
|
|
}
|
|
list_for_each_entry(port, &mstb->ports, next) {
|
|
if (port->mstb) {
|
|
rmstb = drm_dp_mst_get_validated_mstb_ref_locked(port->mstb, to_find);
|
|
if (rmstb)
|
|
return rmstb;
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static struct drm_dp_mst_branch *drm_dp_get_validated_mstb_ref(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_branch *mstb)
|
|
{
|
|
struct drm_dp_mst_branch *rmstb = NULL;
|
|
mutex_lock(&mgr->lock);
|
|
if (mgr->mst_primary)
|
|
rmstb = drm_dp_mst_get_validated_mstb_ref_locked(mgr->mst_primary, mstb);
|
|
mutex_unlock(&mgr->lock);
|
|
return rmstb;
|
|
}
|
|
|
|
static struct drm_dp_mst_port *drm_dp_mst_get_port_ref_locked(struct drm_dp_mst_branch *mstb, struct drm_dp_mst_port *to_find)
|
|
{
|
|
struct drm_dp_mst_port *port, *mport;
|
|
|
|
list_for_each_entry(port, &mstb->ports, next) {
|
|
if (port == to_find) {
|
|
kref_get(&port->kref);
|
|
return port;
|
|
}
|
|
if (port->mstb) {
|
|
mport = drm_dp_mst_get_port_ref_locked(port->mstb, to_find);
|
|
if (mport)
|
|
return mport;
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static struct drm_dp_mst_port *drm_dp_get_validated_port_ref(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port)
|
|
{
|
|
struct drm_dp_mst_port *rport = NULL;
|
|
mutex_lock(&mgr->lock);
|
|
if (mgr->mst_primary)
|
|
rport = drm_dp_mst_get_port_ref_locked(mgr->mst_primary, port);
|
|
mutex_unlock(&mgr->lock);
|
|
return rport;
|
|
}
|
|
|
|
static struct drm_dp_mst_port *drm_dp_get_port(struct drm_dp_mst_branch *mstb, u8 port_num)
|
|
{
|
|
struct drm_dp_mst_port *port;
|
|
|
|
list_for_each_entry(port, &mstb->ports, next) {
|
|
if (port->port_num == port_num) {
|
|
kref_get(&port->kref);
|
|
return port;
|
|
}
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* calculate a new RAD for this MST branch device
|
|
* if parent has an LCT of 2 then it has 1 nibble of RAD,
|
|
* if parent has an LCT of 3 then it has 2 nibbles of RAD,
|
|
*/
|
|
static u8 drm_dp_calculate_rad(struct drm_dp_mst_port *port,
|
|
u8 *rad)
|
|
{
|
|
int lct = port->parent->lct;
|
|
int shift = 4;
|
|
int idx = lct / 2;
|
|
if (lct > 1) {
|
|
memcpy(rad, port->parent->rad, idx);
|
|
shift = (lct % 2) ? 4 : 0;
|
|
} else
|
|
rad[0] = 0;
|
|
|
|
rad[idx] |= port->port_num << shift;
|
|
return lct + 1;
|
|
}
|
|
|
|
/*
|
|
* return sends link address for new mstb
|
|
*/
|
|
static bool drm_dp_port_setup_pdt(struct drm_dp_mst_port *port)
|
|
{
|
|
int ret;
|
|
u8 rad[6], lct;
|
|
bool send_link = false;
|
|
switch (port->pdt) {
|
|
case DP_PEER_DEVICE_DP_LEGACY_CONV:
|
|
case DP_PEER_DEVICE_SST_SINK:
|
|
/* add i2c over sideband */
|
|
ret = drm_dp_mst_register_i2c_bus(&port->aux);
|
|
break;
|
|
case DP_PEER_DEVICE_MST_BRANCHING:
|
|
lct = drm_dp_calculate_rad(port, rad);
|
|
|
|
port->mstb = drm_dp_add_mst_branch_device(lct, rad);
|
|
port->mstb->mgr = port->mgr;
|
|
port->mstb->port_parent = port;
|
|
|
|
send_link = true;
|
|
break;
|
|
}
|
|
return send_link;
|
|
}
|
|
|
|
static void drm_dp_check_port_guid(struct drm_dp_mst_branch *mstb,
|
|
struct drm_dp_mst_port *port)
|
|
{
|
|
int ret;
|
|
if (port->dpcd_rev >= 0x12) {
|
|
port->guid_valid = drm_dp_validate_guid(mstb->mgr, port->guid);
|
|
if (!port->guid_valid) {
|
|
ret = drm_dp_send_dpcd_write(mstb->mgr,
|
|
port,
|
|
DP_GUID,
|
|
16, port->guid);
|
|
port->guid_valid = true;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void build_mst_prop_path(struct drm_dp_mst_port *port,
|
|
struct drm_dp_mst_branch *mstb,
|
|
char *proppath,
|
|
size_t proppath_size)
|
|
{
|
|
int i;
|
|
char temp[8];
|
|
snprintf(proppath, proppath_size, "mst:%d", mstb->mgr->conn_base_id);
|
|
for (i = 0; i < (mstb->lct - 1); i++) {
|
|
int shift = (i % 2) ? 0 : 4;
|
|
int port_num = mstb->rad[i / 2] >> shift;
|
|
snprintf(temp, sizeof(temp), "-%d", port_num);
|
|
strlcat(proppath, temp, proppath_size);
|
|
}
|
|
snprintf(temp, sizeof(temp), "-%d", port->port_num);
|
|
strlcat(proppath, temp, proppath_size);
|
|
}
|
|
|
|
static void drm_dp_add_port(struct drm_dp_mst_branch *mstb,
|
|
struct device *dev,
|
|
struct drm_dp_link_addr_reply_port *port_msg)
|
|
{
|
|
struct drm_dp_mst_port *port;
|
|
bool ret;
|
|
bool created = false;
|
|
int old_pdt = 0;
|
|
int old_ddps = 0;
|
|
port = drm_dp_get_port(mstb, port_msg->port_number);
|
|
if (!port) {
|
|
port = kzalloc(sizeof(*port), GFP_KERNEL);
|
|
if (!port)
|
|
return;
|
|
kref_init(&port->kref);
|
|
port->parent = mstb;
|
|
port->port_num = port_msg->port_number;
|
|
port->mgr = mstb->mgr;
|
|
port->aux.name = "DPMST";
|
|
port->aux.dev = dev;
|
|
created = true;
|
|
} else {
|
|
old_pdt = port->pdt;
|
|
old_ddps = port->ddps;
|
|
}
|
|
|
|
port->pdt = port_msg->peer_device_type;
|
|
port->input = port_msg->input_port;
|
|
port->mcs = port_msg->mcs;
|
|
port->ddps = port_msg->ddps;
|
|
port->ldps = port_msg->legacy_device_plug_status;
|
|
port->dpcd_rev = port_msg->dpcd_revision;
|
|
port->num_sdp_streams = port_msg->num_sdp_streams;
|
|
port->num_sdp_stream_sinks = port_msg->num_sdp_stream_sinks;
|
|
memcpy(port->guid, port_msg->peer_guid, 16);
|
|
|
|
/* manage mstb port lists with mgr lock - take a reference
|
|
for this list */
|
|
if (created) {
|
|
mutex_lock(&mstb->mgr->lock);
|
|
kref_get(&port->kref);
|
|
list_add(&port->next, &mstb->ports);
|
|
mutex_unlock(&mstb->mgr->lock);
|
|
}
|
|
|
|
if (old_ddps != port->ddps) {
|
|
if (port->ddps) {
|
|
drm_dp_check_port_guid(mstb, port);
|
|
if (!port->input)
|
|
drm_dp_send_enum_path_resources(mstb->mgr, mstb, port);
|
|
} else {
|
|
port->guid_valid = false;
|
|
port->available_pbn = 0;
|
|
}
|
|
}
|
|
|
|
if (old_pdt != port->pdt && !port->input) {
|
|
drm_dp_port_teardown_pdt(port, old_pdt);
|
|
|
|
ret = drm_dp_port_setup_pdt(port);
|
|
if (ret == true) {
|
|
drm_dp_send_link_address(mstb->mgr, port->mstb);
|
|
port->mstb->link_address_sent = true;
|
|
}
|
|
}
|
|
|
|
if (created && !port->input) {
|
|
char proppath[255];
|
|
build_mst_prop_path(port, mstb, proppath, sizeof(proppath));
|
|
port->connector = (*mstb->mgr->cbs->add_connector)(mstb->mgr, port, proppath);
|
|
|
|
if (port->port_num >= 8) {
|
|
port->cached_edid = drm_get_edid(port->connector, &port->aux.ddc);
|
|
}
|
|
}
|
|
|
|
/* put reference to this port */
|
|
drm_dp_put_port(port);
|
|
}
|
|
|
|
static void drm_dp_update_port(struct drm_dp_mst_branch *mstb,
|
|
struct drm_dp_connection_status_notify *conn_stat)
|
|
{
|
|
struct drm_dp_mst_port *port;
|
|
int old_pdt;
|
|
int old_ddps;
|
|
bool dowork = false;
|
|
port = drm_dp_get_port(mstb, conn_stat->port_number);
|
|
if (!port)
|
|
return;
|
|
|
|
old_ddps = port->ddps;
|
|
old_pdt = port->pdt;
|
|
port->pdt = conn_stat->peer_device_type;
|
|
port->mcs = conn_stat->message_capability_status;
|
|
port->ldps = conn_stat->legacy_device_plug_status;
|
|
port->ddps = conn_stat->displayport_device_plug_status;
|
|
|
|
if (old_ddps != port->ddps) {
|
|
if (port->ddps) {
|
|
drm_dp_check_port_guid(mstb, port);
|
|
dowork = true;
|
|
} else {
|
|
port->guid_valid = false;
|
|
port->available_pbn = 0;
|
|
}
|
|
}
|
|
if (old_pdt != port->pdt && !port->input) {
|
|
drm_dp_port_teardown_pdt(port, old_pdt);
|
|
|
|
if (drm_dp_port_setup_pdt(port))
|
|
dowork = true;
|
|
}
|
|
|
|
drm_dp_put_port(port);
|
|
// if (dowork)
|
|
// queue_work(system_long_wq, &mstb->mgr->work);
|
|
|
|
}
|
|
|
|
static struct drm_dp_mst_branch *drm_dp_get_mst_branch_device(struct drm_dp_mst_topology_mgr *mgr,
|
|
u8 lct, u8 *rad)
|
|
{
|
|
struct drm_dp_mst_branch *mstb;
|
|
struct drm_dp_mst_port *port;
|
|
int i;
|
|
/* find the port by iterating down */
|
|
mstb = mgr->mst_primary;
|
|
|
|
for (i = 0; i < lct - 1; i++) {
|
|
int shift = (i % 2) ? 0 : 4;
|
|
int port_num = rad[i / 2] >> shift;
|
|
|
|
list_for_each_entry(port, &mstb->ports, next) {
|
|
if (port->port_num == port_num) {
|
|
if (!port->mstb) {
|
|
DRM_ERROR("failed to lookup MSTB with lct %d, rad %02x\n", lct, rad[0]);
|
|
return NULL;
|
|
}
|
|
|
|
mstb = port->mstb;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
kref_get(&mstb->kref);
|
|
return mstb;
|
|
}
|
|
|
|
static void drm_dp_check_and_send_link_address(struct drm_dp_mst_topology_mgr *mgr,
|
|
struct drm_dp_mst_branch *mstb)
|
|
{
|
|
struct drm_dp_mst_port *port;
|
|
|
|
if (!mstb->link_address_sent) {
|
|
drm_dp_send_link_address(mgr, mstb);
|
|
mstb->link_address_sent = true;
|
|
}
|
|
list_for_each_entry(port, &mstb->ports, next) {
|
|
if (port->input)
|
|
continue;
|
|
|
|
if (!port->ddps)
|
|
continue;
|
|
|
|
if (!port->available_pbn)
|
|
drm_dp_send_enum_path_resources(mgr, mstb, port);
|
|
|
|
if (port->mstb)
|
|
drm_dp_check_and_send_link_address(mgr, port->mstb);
|
|
}
|
|
}
|
|
|
|
static void drm_dp_mst_link_probe_work(struct work_struct *work)
|
|
{
|
|
struct drm_dp_mst_topology_mgr *mgr = container_of(work, struct drm_dp_mst_topology_mgr, work);
|
|
|
|
drm_dp_check_and_send_link_address(mgr, mgr->mst_primary);
|
|
|
|
}
|
|
|
|
static bool drm_dp_validate_guid(struct drm_dp_mst_topology_mgr *mgr,
|
|
u8 *guid)
|
|
{
|
|
static u8 zero_guid[16];
|
|
|
|
if (!memcmp(guid, zero_guid, 16)) {
|
|
u64 salt = get_jiffies_64();
|
|
memcpy(&guid[0], &salt, sizeof(u64));
|
|
memcpy(&guid[8], &salt, sizeof(u64));
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
#if 0
|
|
static int build_dpcd_read(struct drm_dp_sideband_msg_tx *msg, u8 port_num, u32 offset, u8 num_bytes)
|
|
{
|
|
struct drm_dp_sideband_msg_req_body req;
|
|
|
|
req.req_type = DP_REMOTE_DPCD_READ;
|
|
req.u.dpcd_read.port_number = port_num;
|
|
req.u.dpcd_read.dpcd_address = offset;
|
|
req.u.dpcd_read.num_bytes = num_bytes;
|
|
drm_dp_encode_sideband_req(&req, msg);
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static int drm_dp_send_sideband_msg(struct drm_dp_mst_topology_mgr *mgr,
|
|
bool up, u8 *msg, int len)
|
|
{
|
|
int ret;
|
|
int regbase = up ? DP_SIDEBAND_MSG_UP_REP_BASE : DP_SIDEBAND_MSG_DOWN_REQ_BASE;
|
|
int tosend, total, offset;
|
|
int retries = 0;
|
|
|
|
retry:
|
|
total = len;
|
|
offset = 0;
|
|
do {
|
|
tosend = min3(mgr->max_dpcd_transaction_bytes, 16, total);
|
|
|
|
ret = drm_dp_dpcd_write(mgr->aux, regbase + offset,
|
|
&msg[offset],
|
|
tosend);
|
|
if (ret != tosend) {
|
|
if (ret == -EIO && retries < 5) {
|
|
retries++;
|
|
goto retry;
|
|
}
|
|
DRM_DEBUG_KMS("failed to dpcd write %d %d\n", tosend, ret);
|
|
WARN(1, "fail\n");
|
|
|
|
return -EIO;
|
|
}
|
|
offset += tosend;
|
|
total -= tosend;
|
|
} while (total > 0);
|
|
return 0;
|
|
}
|
|
|
|
static int set_hdr_from_dst_qlock(struct drm_dp_sideband_msg_hdr *hdr,
|
|
struct drm_dp_sideband_msg_tx *txmsg)
|
|
{
|
|
struct drm_dp_mst_branch *mstb = txmsg->dst;
|
|
|
|
/* both msg slots are full */
|
|
if (txmsg->seqno == -1) {
|
|
if (mstb->tx_slots[0] && mstb->tx_slots[1]) {
|
|
DRM_DEBUG_KMS("%s: failed to find slot\n", __func__);
|
|
return -EAGAIN;
|
|
}
|
|
if (mstb->tx_slots[0] == NULL && mstb->tx_slots[1] == NULL) {
|
|
txmsg->seqno = mstb->last_seqno;
|
|
mstb->last_seqno ^= 1;
|
|
} else if (mstb->tx_slots[0] == NULL)
|
|
txmsg->seqno = 0;
|
|
else
|
|
txmsg->seqno = 1;
|
|
mstb->tx_slots[txmsg->seqno] = txmsg;
|
|
}
|
|
hdr->broadcast = 0;
|
|
hdr->path_msg = txmsg->path_msg;
|
|
hdr->lct = mstb->lct;
|
|
hdr->lcr = mstb->lct - 1;
|
|
if (mstb->lct > 1)
|
|
memcpy(hdr->rad, mstb->rad, mstb->lct / 2);
|
|
hdr->seqno = txmsg->seqno;
|
|
return 0;
|
|
}
|
|
/*
|
|
* process a single block of the next message in the sideband queue
|
|
*/
|
|
static int process_single_tx_qlock(struct drm_dp_mst_topology_mgr *mgr,
|
|
struct drm_dp_sideband_msg_tx *txmsg,
|
|
bool up)
|
|
{
|
|
u8 chunk[48];
|
|
struct drm_dp_sideband_msg_hdr hdr;
|
|
int len, space, idx, tosend;
|
|
int ret;
|
|
|
|
memset(&hdr, 0, sizeof(struct drm_dp_sideband_msg_hdr));
|
|
|
|
if (txmsg->state == DRM_DP_SIDEBAND_TX_QUEUED) {
|
|
txmsg->seqno = -1;
|
|
txmsg->state = DRM_DP_SIDEBAND_TX_START_SEND;
|
|
}
|
|
|
|
/* make hdr from dst mst - for replies use seqno
|
|
otherwise assign one */
|
|
ret = set_hdr_from_dst_qlock(&hdr, txmsg);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
/* amount left to send in this message */
|
|
len = txmsg->cur_len - txmsg->cur_offset;
|
|
|
|
/* 48 - sideband msg size - 1 byte for data CRC, x header bytes */
|
|
space = 48 - 1 - drm_dp_calc_sb_hdr_size(&hdr);
|
|
|
|
tosend = min(len, space);
|
|
if (len == txmsg->cur_len)
|
|
hdr.somt = 1;
|
|
if (space >= len)
|
|
hdr.eomt = 1;
|
|
|
|
|
|
hdr.msg_len = tosend + 1;
|
|
drm_dp_encode_sideband_msg_hdr(&hdr, chunk, &idx);
|
|
memcpy(&chunk[idx], &txmsg->msg[txmsg->cur_offset], tosend);
|
|
/* add crc at end */
|
|
drm_dp_crc_sideband_chunk_req(&chunk[idx], tosend);
|
|
idx += tosend + 1;
|
|
|
|
ret = drm_dp_send_sideband_msg(mgr, up, chunk, idx);
|
|
if (ret) {
|
|
DRM_DEBUG_KMS("sideband msg failed to send\n");
|
|
return ret;
|
|
}
|
|
|
|
txmsg->cur_offset += tosend;
|
|
if (txmsg->cur_offset == txmsg->cur_len) {
|
|
txmsg->state = DRM_DP_SIDEBAND_TX_SENT;
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* must be called holding qlock */
|
|
static void process_single_down_tx_qlock(struct drm_dp_mst_topology_mgr *mgr)
|
|
{
|
|
struct drm_dp_sideband_msg_tx *txmsg;
|
|
int ret;
|
|
|
|
/* construct a chunk from the first msg in the tx_msg queue */
|
|
if (list_empty(&mgr->tx_msg_downq)) {
|
|
mgr->tx_down_in_progress = false;
|
|
return;
|
|
}
|
|
mgr->tx_down_in_progress = true;
|
|
|
|
txmsg = list_first_entry(&mgr->tx_msg_downq, struct drm_dp_sideband_msg_tx, next);
|
|
ret = process_single_tx_qlock(mgr, txmsg, false);
|
|
if (ret == 1) {
|
|
/* txmsg is sent it should be in the slots now */
|
|
list_del(&txmsg->next);
|
|
} else if (ret) {
|
|
DRM_DEBUG_KMS("failed to send msg in q %d\n", ret);
|
|
list_del(&txmsg->next);
|
|
if (txmsg->seqno != -1)
|
|
txmsg->dst->tx_slots[txmsg->seqno] = NULL;
|
|
txmsg->state = DRM_DP_SIDEBAND_TX_TIMEOUT;
|
|
// wake_up(&mgr->tx_waitq);
|
|
}
|
|
if (list_empty(&mgr->tx_msg_downq)) {
|
|
mgr->tx_down_in_progress = false;
|
|
return;
|
|
}
|
|
}
|
|
|
|
/* called holding qlock */
|
|
static void process_single_up_tx_qlock(struct drm_dp_mst_topology_mgr *mgr)
|
|
{
|
|
struct drm_dp_sideband_msg_tx *txmsg;
|
|
int ret;
|
|
|
|
/* construct a chunk from the first msg in the tx_msg queue */
|
|
if (list_empty(&mgr->tx_msg_upq)) {
|
|
mgr->tx_up_in_progress = false;
|
|
return;
|
|
}
|
|
|
|
txmsg = list_first_entry(&mgr->tx_msg_upq, struct drm_dp_sideband_msg_tx, next);
|
|
ret = process_single_tx_qlock(mgr, txmsg, true);
|
|
if (ret == 1) {
|
|
/* up txmsgs aren't put in slots - so free after we send it */
|
|
list_del(&txmsg->next);
|
|
kfree(txmsg);
|
|
} else if (ret)
|
|
DRM_DEBUG_KMS("failed to send msg in q %d\n", ret);
|
|
mgr->tx_up_in_progress = true;
|
|
}
|
|
|
|
static void drm_dp_queue_down_tx(struct drm_dp_mst_topology_mgr *mgr,
|
|
struct drm_dp_sideband_msg_tx *txmsg)
|
|
{
|
|
mutex_lock(&mgr->qlock);
|
|
list_add_tail(&txmsg->next, &mgr->tx_msg_downq);
|
|
if (!mgr->tx_down_in_progress)
|
|
process_single_down_tx_qlock(mgr);
|
|
mutex_unlock(&mgr->qlock);
|
|
}
|
|
|
|
static int drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr,
|
|
struct drm_dp_mst_branch *mstb)
|
|
{
|
|
int len;
|
|
struct drm_dp_sideband_msg_tx *txmsg;
|
|
int ret;
|
|
|
|
txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
|
|
if (!txmsg)
|
|
return -ENOMEM;
|
|
|
|
txmsg->dst = mstb;
|
|
len = build_link_address(txmsg);
|
|
|
|
drm_dp_queue_down_tx(mgr, txmsg);
|
|
|
|
ret = drm_dp_mst_wait_tx_reply(mstb, txmsg);
|
|
if (ret > 0) {
|
|
int i;
|
|
|
|
if (txmsg->reply.reply_type == 1)
|
|
DRM_DEBUG_KMS("link address nak received\n");
|
|
else {
|
|
DRM_DEBUG_KMS("link address reply: %d\n", txmsg->reply.u.link_addr.nports);
|
|
for (i = 0; i < txmsg->reply.u.link_addr.nports; i++) {
|
|
DRM_DEBUG_KMS("port %d: input %d, pdt: %d, pn: %d, dpcd_rev: %02x, mcs: %d, ddps: %d, ldps %d, sdp %d/%d\n", i,
|
|
txmsg->reply.u.link_addr.ports[i].input_port,
|
|
txmsg->reply.u.link_addr.ports[i].peer_device_type,
|
|
txmsg->reply.u.link_addr.ports[i].port_number,
|
|
txmsg->reply.u.link_addr.ports[i].dpcd_revision,
|
|
txmsg->reply.u.link_addr.ports[i].mcs,
|
|
txmsg->reply.u.link_addr.ports[i].ddps,
|
|
txmsg->reply.u.link_addr.ports[i].legacy_device_plug_status,
|
|
txmsg->reply.u.link_addr.ports[i].num_sdp_streams,
|
|
txmsg->reply.u.link_addr.ports[i].num_sdp_stream_sinks);
|
|
}
|
|
for (i = 0; i < txmsg->reply.u.link_addr.nports; i++) {
|
|
drm_dp_add_port(mstb, mgr->dev, &txmsg->reply.u.link_addr.ports[i]);
|
|
}
|
|
(*mgr->cbs->hotplug)(mgr);
|
|
}
|
|
} else
|
|
DRM_DEBUG_KMS("link address failed %d\n", ret);
|
|
|
|
kfree(txmsg);
|
|
return 0;
|
|
}
|
|
|
|
static int drm_dp_send_enum_path_resources(struct drm_dp_mst_topology_mgr *mgr,
|
|
struct drm_dp_mst_branch *mstb,
|
|
struct drm_dp_mst_port *port)
|
|
{
|
|
int len;
|
|
struct drm_dp_sideband_msg_tx *txmsg;
|
|
int ret;
|
|
|
|
txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
|
|
if (!txmsg)
|
|
return -ENOMEM;
|
|
|
|
txmsg->dst = mstb;
|
|
len = build_enum_path_resources(txmsg, port->port_num);
|
|
|
|
drm_dp_queue_down_tx(mgr, txmsg);
|
|
|
|
ret = drm_dp_mst_wait_tx_reply(mstb, txmsg);
|
|
if (ret > 0) {
|
|
if (txmsg->reply.reply_type == 1)
|
|
DRM_DEBUG_KMS("enum path resources nak received\n");
|
|
else {
|
|
if (port->port_num != txmsg->reply.u.path_resources.port_number)
|
|
DRM_ERROR("got incorrect port in response\n");
|
|
DRM_DEBUG_KMS("enum path resources %d: %d %d\n", txmsg->reply.u.path_resources.port_number, txmsg->reply.u.path_resources.full_payload_bw_number,
|
|
txmsg->reply.u.path_resources.avail_payload_bw_number);
|
|
port->available_pbn = txmsg->reply.u.path_resources.avail_payload_bw_number;
|
|
}
|
|
}
|
|
|
|
kfree(txmsg);
|
|
return 0;
|
|
}
|
|
|
|
static int drm_dp_payload_send_msg(struct drm_dp_mst_topology_mgr *mgr,
|
|
struct drm_dp_mst_port *port,
|
|
int id,
|
|
int pbn)
|
|
{
|
|
struct drm_dp_sideband_msg_tx *txmsg;
|
|
struct drm_dp_mst_branch *mstb;
|
|
int len, ret;
|
|
|
|
mstb = drm_dp_get_validated_mstb_ref(mgr, port->parent);
|
|
if (!mstb)
|
|
return -EINVAL;
|
|
|
|
txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
|
|
if (!txmsg) {
|
|
ret = -ENOMEM;
|
|
goto fail_put;
|
|
}
|
|
|
|
txmsg->dst = mstb;
|
|
len = build_allocate_payload(txmsg, port->port_num,
|
|
id,
|
|
pbn);
|
|
|
|
drm_dp_queue_down_tx(mgr, txmsg);
|
|
|
|
ret = drm_dp_mst_wait_tx_reply(mstb, txmsg);
|
|
if (ret > 0) {
|
|
if (txmsg->reply.reply_type == 1) {
|
|
ret = -EINVAL;
|
|
} else
|
|
ret = 0;
|
|
}
|
|
kfree(txmsg);
|
|
fail_put:
|
|
drm_dp_put_mst_branch_device(mstb);
|
|
return ret;
|
|
}
|
|
|
|
static int drm_dp_create_payload_step1(struct drm_dp_mst_topology_mgr *mgr,
|
|
int id,
|
|
struct drm_dp_payload *payload)
|
|
{
|
|
int ret;
|
|
|
|
ret = drm_dp_dpcd_write_payload(mgr, id, payload);
|
|
if (ret < 0) {
|
|
payload->payload_state = 0;
|
|
return ret;
|
|
}
|
|
payload->payload_state = DP_PAYLOAD_LOCAL;
|
|
return 0;
|
|
}
|
|
|
|
static int drm_dp_create_payload_step2(struct drm_dp_mst_topology_mgr *mgr,
|
|
struct drm_dp_mst_port *port,
|
|
int id,
|
|
struct drm_dp_payload *payload)
|
|
{
|
|
int ret;
|
|
ret = drm_dp_payload_send_msg(mgr, port, id, port->vcpi.pbn);
|
|
if (ret < 0)
|
|
return ret;
|
|
payload->payload_state = DP_PAYLOAD_REMOTE;
|
|
return ret;
|
|
}
|
|
|
|
static int drm_dp_destroy_payload_step1(struct drm_dp_mst_topology_mgr *mgr,
|
|
struct drm_dp_mst_port *port,
|
|
int id,
|
|
struct drm_dp_payload *payload)
|
|
{
|
|
DRM_DEBUG_KMS("\n");
|
|
/* its okay for these to fail */
|
|
if (port) {
|
|
drm_dp_payload_send_msg(mgr, port, id, 0);
|
|
}
|
|
|
|
drm_dp_dpcd_write_payload(mgr, id, payload);
|
|
payload->payload_state = DP_PAYLOAD_DELETE_LOCAL;
|
|
return 0;
|
|
}
|
|
|
|
static int drm_dp_destroy_payload_step2(struct drm_dp_mst_topology_mgr *mgr,
|
|
int id,
|
|
struct drm_dp_payload *payload)
|
|
{
|
|
payload->payload_state = 0;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* drm_dp_update_payload_part1() - Execute payload update part 1
|
|
* @mgr: manager to use.
|
|
*
|
|
* This iterates over all proposed virtual channels, and tries to
|
|
* allocate space in the link for them. For 0->slots transitions,
|
|
* this step just writes the VCPI to the MST device. For slots->0
|
|
* transitions, this writes the updated VCPIs and removes the
|
|
* remote VC payloads.
|
|
*
|
|
* after calling this the driver should generate ACT and payload
|
|
* packets.
|
|
*/
|
|
int drm_dp_update_payload_part1(struct drm_dp_mst_topology_mgr *mgr)
|
|
{
|
|
int i, j;
|
|
int cur_slots = 1;
|
|
struct drm_dp_payload req_payload;
|
|
struct drm_dp_mst_port *port;
|
|
|
|
mutex_lock(&mgr->payload_lock);
|
|
for (i = 0; i < mgr->max_payloads; i++) {
|
|
/* solve the current payloads - compare to the hw ones
|
|
- update the hw view */
|
|
req_payload.start_slot = cur_slots;
|
|
if (mgr->proposed_vcpis[i]) {
|
|
port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi);
|
|
req_payload.num_slots = mgr->proposed_vcpis[i]->num_slots;
|
|
} else {
|
|
port = NULL;
|
|
req_payload.num_slots = 0;
|
|
}
|
|
|
|
if (mgr->payloads[i].start_slot != req_payload.start_slot) {
|
|
mgr->payloads[i].start_slot = req_payload.start_slot;
|
|
}
|
|
/* work out what is required to happen with this payload */
|
|
if (mgr->payloads[i].num_slots != req_payload.num_slots) {
|
|
|
|
/* need to push an update for this payload */
|
|
if (req_payload.num_slots) {
|
|
drm_dp_create_payload_step1(mgr, mgr->proposed_vcpis[i]->vcpi, &req_payload);
|
|
mgr->payloads[i].num_slots = req_payload.num_slots;
|
|
} else if (mgr->payloads[i].num_slots) {
|
|
mgr->payloads[i].num_slots = 0;
|
|
drm_dp_destroy_payload_step1(mgr, port, port->vcpi.vcpi, &mgr->payloads[i]);
|
|
req_payload.payload_state = mgr->payloads[i].payload_state;
|
|
mgr->payloads[i].start_slot = 0;
|
|
}
|
|
mgr->payloads[i].payload_state = req_payload.payload_state;
|
|
}
|
|
cur_slots += req_payload.num_slots;
|
|
}
|
|
|
|
for (i = 0; i < mgr->max_payloads; i++) {
|
|
if (mgr->payloads[i].payload_state == DP_PAYLOAD_DELETE_LOCAL) {
|
|
DRM_DEBUG_KMS("removing payload %d\n", i);
|
|
for (j = i; j < mgr->max_payloads - 1; j++) {
|
|
memcpy(&mgr->payloads[j], &mgr->payloads[j + 1], sizeof(struct drm_dp_payload));
|
|
mgr->proposed_vcpis[j] = mgr->proposed_vcpis[j + 1];
|
|
if (mgr->proposed_vcpis[j] && mgr->proposed_vcpis[j]->num_slots) {
|
|
set_bit(j + 1, &mgr->payload_mask);
|
|
} else {
|
|
clear_bit(j + 1, &mgr->payload_mask);
|
|
}
|
|
}
|
|
memset(&mgr->payloads[mgr->max_payloads - 1], 0, sizeof(struct drm_dp_payload));
|
|
mgr->proposed_vcpis[mgr->max_payloads - 1] = NULL;
|
|
clear_bit(mgr->max_payloads, &mgr->payload_mask);
|
|
|
|
}
|
|
}
|
|
mutex_unlock(&mgr->payload_lock);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(drm_dp_update_payload_part1);
|
|
|
|
/**
|
|
* drm_dp_update_payload_part2() - Execute payload update part 2
|
|
* @mgr: manager to use.
|
|
*
|
|
* This iterates over all proposed virtual channels, and tries to
|
|
* allocate space in the link for them. For 0->slots transitions,
|
|
* this step writes the remote VC payload commands. For slots->0
|
|
* this just resets some internal state.
|
|
*/
|
|
int drm_dp_update_payload_part2(struct drm_dp_mst_topology_mgr *mgr)
|
|
{
|
|
struct drm_dp_mst_port *port;
|
|
int i;
|
|
int ret = 0;
|
|
mutex_lock(&mgr->payload_lock);
|
|
for (i = 0; i < mgr->max_payloads; i++) {
|
|
|
|
if (!mgr->proposed_vcpis[i])
|
|
continue;
|
|
|
|
port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi);
|
|
|
|
DRM_DEBUG_KMS("payload %d %d\n", i, mgr->payloads[i].payload_state);
|
|
if (mgr->payloads[i].payload_state == DP_PAYLOAD_LOCAL) {
|
|
ret = drm_dp_create_payload_step2(mgr, port, mgr->proposed_vcpis[i]->vcpi, &mgr->payloads[i]);
|
|
} else if (mgr->payloads[i].payload_state == DP_PAYLOAD_DELETE_LOCAL) {
|
|
ret = drm_dp_destroy_payload_step2(mgr, mgr->proposed_vcpis[i]->vcpi, &mgr->payloads[i]);
|
|
}
|
|
if (ret) {
|
|
mutex_unlock(&mgr->payload_lock);
|
|
return ret;
|
|
}
|
|
}
|
|
mutex_unlock(&mgr->payload_lock);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(drm_dp_update_payload_part2);
|
|
|
|
#if 0 /* unused as of yet */
|
|
static int drm_dp_send_dpcd_read(struct drm_dp_mst_topology_mgr *mgr,
|
|
struct drm_dp_mst_port *port,
|
|
int offset, int size)
|
|
{
|
|
int len;
|
|
struct drm_dp_sideband_msg_tx *txmsg;
|
|
|
|
txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
|
|
if (!txmsg)
|
|
return -ENOMEM;
|
|
|
|
len = build_dpcd_read(txmsg, port->port_num, 0, 8);
|
|
txmsg->dst = port->parent;
|
|
|
|
drm_dp_queue_down_tx(mgr, txmsg);
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static int drm_dp_send_dpcd_write(struct drm_dp_mst_topology_mgr *mgr,
|
|
struct drm_dp_mst_port *port,
|
|
int offset, int size, u8 *bytes)
|
|
{
|
|
int len;
|
|
int ret;
|
|
struct drm_dp_sideband_msg_tx *txmsg;
|
|
struct drm_dp_mst_branch *mstb;
|
|
|
|
mstb = drm_dp_get_validated_mstb_ref(mgr, port->parent);
|
|
if (!mstb)
|
|
return -EINVAL;
|
|
|
|
txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
|
|
if (!txmsg) {
|
|
ret = -ENOMEM;
|
|
goto fail_put;
|
|
}
|
|
|
|
len = build_dpcd_write(txmsg, port->port_num, offset, size, bytes);
|
|
txmsg->dst = mstb;
|
|
|
|
drm_dp_queue_down_tx(mgr, txmsg);
|
|
|
|
ret = drm_dp_mst_wait_tx_reply(mstb, txmsg);
|
|
if (ret > 0) {
|
|
if (txmsg->reply.reply_type == 1) {
|
|
ret = -EINVAL;
|
|
} else
|
|
ret = 0;
|
|
}
|
|
kfree(txmsg);
|
|
fail_put:
|
|
drm_dp_put_mst_branch_device(mstb);
|
|
return ret;
|
|
}
|
|
|
|
static int drm_dp_encode_up_ack_reply(struct drm_dp_sideband_msg_tx *msg, u8 req_type)
|
|
{
|
|
struct drm_dp_sideband_msg_reply_body reply;
|
|
|
|
reply.reply_type = 1;
|
|
reply.req_type = req_type;
|
|
drm_dp_encode_sideband_reply(&reply, msg);
|
|
return 0;
|
|
}
|
|
|
|
static int drm_dp_send_up_ack_reply(struct drm_dp_mst_topology_mgr *mgr,
|
|
struct drm_dp_mst_branch *mstb,
|
|
int req_type, int seqno, bool broadcast)
|
|
{
|
|
struct drm_dp_sideband_msg_tx *txmsg;
|
|
|
|
txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
|
|
if (!txmsg)
|
|
return -ENOMEM;
|
|
|
|
txmsg->dst = mstb;
|
|
txmsg->seqno = seqno;
|
|
drm_dp_encode_up_ack_reply(txmsg, req_type);
|
|
|
|
mutex_lock(&mgr->qlock);
|
|
list_add_tail(&txmsg->next, &mgr->tx_msg_upq);
|
|
if (!mgr->tx_up_in_progress) {
|
|
process_single_up_tx_qlock(mgr);
|
|
}
|
|
mutex_unlock(&mgr->qlock);
|
|
return 0;
|
|
}
|
|
|
|
static bool drm_dp_get_vc_payload_bw(int dp_link_bw,
|
|
int dp_link_count,
|
|
int *out)
|
|
{
|
|
switch (dp_link_bw) {
|
|
default:
|
|
DRM_DEBUG_KMS("invalid link bandwidth in DPCD: %x (link count: %d)\n",
|
|
dp_link_bw, dp_link_count);
|
|
return false;
|
|
|
|
case DP_LINK_BW_1_62:
|
|
*out = 3 * dp_link_count;
|
|
break;
|
|
case DP_LINK_BW_2_7:
|
|
*out = 5 * dp_link_count;
|
|
break;
|
|
case DP_LINK_BW_5_4:
|
|
*out = 10 * dp_link_count;
|
|
break;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* drm_dp_mst_topology_mgr_set_mst() - Set the MST state for a topology manager
|
|
* @mgr: manager to set state for
|
|
* @mst_state: true to enable MST on this connector - false to disable.
|
|
*
|
|
* This is called by the driver when it detects an MST capable device plugged
|
|
* into a DP MST capable port, or when a DP MST capable device is unplugged.
|
|
*/
|
|
int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool mst_state)
|
|
{
|
|
int ret = 0;
|
|
struct drm_dp_mst_branch *mstb = NULL;
|
|
|
|
mutex_lock(&mgr->lock);
|
|
if (mst_state == mgr->mst_state)
|
|
goto out_unlock;
|
|
|
|
mgr->mst_state = mst_state;
|
|
/* set the device into MST mode */
|
|
if (mst_state) {
|
|
WARN_ON(mgr->mst_primary);
|
|
|
|
/* get dpcd info */
|
|
ret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, mgr->dpcd, DP_RECEIVER_CAP_SIZE);
|
|
if (ret != DP_RECEIVER_CAP_SIZE) {
|
|
DRM_DEBUG_KMS("failed to read DPCD\n");
|
|
goto out_unlock;
|
|
}
|
|
|
|
if (!drm_dp_get_vc_payload_bw(mgr->dpcd[1],
|
|
mgr->dpcd[2] & DP_MAX_LANE_COUNT_MASK,
|
|
&mgr->pbn_div)) {
|
|
ret = -EINVAL;
|
|
goto out_unlock;
|
|
}
|
|
|
|
mgr->total_pbn = 2560;
|
|
mgr->total_slots = DIV_ROUND_UP(mgr->total_pbn, mgr->pbn_div);
|
|
mgr->avail_slots = mgr->total_slots;
|
|
|
|
/* add initial branch device at LCT 1 */
|
|
mstb = drm_dp_add_mst_branch_device(1, NULL);
|
|
if (mstb == NULL) {
|
|
ret = -ENOMEM;
|
|
goto out_unlock;
|
|
}
|
|
mstb->mgr = mgr;
|
|
|
|
/* give this the main reference */
|
|
mgr->mst_primary = mstb;
|
|
kref_get(&mgr->mst_primary->kref);
|
|
|
|
{
|
|
struct drm_dp_payload reset_pay;
|
|
reset_pay.start_slot = 0;
|
|
reset_pay.num_slots = 0x3f;
|
|
drm_dp_dpcd_write_payload(mgr, 0, &reset_pay);
|
|
}
|
|
|
|
ret = drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL,
|
|
DP_MST_EN | DP_UP_REQ_EN | DP_UPSTREAM_IS_SRC);
|
|
if (ret < 0) {
|
|
goto out_unlock;
|
|
}
|
|
|
|
|
|
/* sort out guid */
|
|
ret = drm_dp_dpcd_read(mgr->aux, DP_GUID, mgr->guid, 16);
|
|
if (ret != 16) {
|
|
DRM_DEBUG_KMS("failed to read DP GUID %d\n", ret);
|
|
goto out_unlock;
|
|
}
|
|
|
|
mgr->guid_valid = drm_dp_validate_guid(mgr, mgr->guid);
|
|
if (!mgr->guid_valid) {
|
|
ret = drm_dp_dpcd_write(mgr->aux, DP_GUID, mgr->guid, 16);
|
|
mgr->guid_valid = true;
|
|
}
|
|
|
|
// queue_work(system_long_wq, &mgr->work);
|
|
|
|
ret = 0;
|
|
} else {
|
|
/* disable MST on the device */
|
|
mstb = mgr->mst_primary;
|
|
mgr->mst_primary = NULL;
|
|
/* this can fail if the device is gone */
|
|
drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, 0);
|
|
ret = 0;
|
|
memset(mgr->payloads, 0, mgr->max_payloads * sizeof(struct drm_dp_payload));
|
|
mgr->payload_mask = 0;
|
|
set_bit(0, &mgr->payload_mask);
|
|
mgr->vcpi_mask = 0;
|
|
}
|
|
|
|
out_unlock:
|
|
mutex_unlock(&mgr->lock);
|
|
if (mstb)
|
|
drm_dp_put_mst_branch_device(mstb);
|
|
return ret;
|
|
|
|
}
|
|
EXPORT_SYMBOL(drm_dp_mst_topology_mgr_set_mst);
|
|
|
|
/**
|
|
* drm_dp_mst_topology_mgr_suspend() - suspend the MST manager
|
|
* @mgr: manager to suspend
|
|
*
|
|
* This function tells the MST device that we can't handle UP messages
|
|
* anymore. This should stop it from sending any since we are suspended.
|
|
*/
|
|
void drm_dp_mst_topology_mgr_suspend(struct drm_dp_mst_topology_mgr *mgr)
|
|
{
|
|
mutex_lock(&mgr->lock);
|
|
drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL,
|
|
DP_MST_EN | DP_UPSTREAM_IS_SRC);
|
|
mutex_unlock(&mgr->lock);
|
|
}
|
|
EXPORT_SYMBOL(drm_dp_mst_topology_mgr_suspend);
|
|
|
|
/**
|
|
* drm_dp_mst_topology_mgr_resume() - resume the MST manager
|
|
* @mgr: manager to resume
|
|
*
|
|
* This will fetch DPCD and see if the device is still there,
|
|
* if it is, it will rewrite the MSTM control bits, and return.
|
|
*
|
|
* if the device fails this returns -1, and the driver should do
|
|
* a full MST reprobe, in case we were undocked.
|
|
*/
|
|
int drm_dp_mst_topology_mgr_resume(struct drm_dp_mst_topology_mgr *mgr)
|
|
{
|
|
int ret = 0;
|
|
|
|
mutex_lock(&mgr->lock);
|
|
|
|
if (mgr->mst_primary) {
|
|
int sret;
|
|
sret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, mgr->dpcd, DP_RECEIVER_CAP_SIZE);
|
|
if (sret != DP_RECEIVER_CAP_SIZE) {
|
|
DRM_DEBUG_KMS("dpcd read failed - undocked during suspend?\n");
|
|
ret = -1;
|
|
goto out_unlock;
|
|
}
|
|
|
|
ret = drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL,
|
|
DP_MST_EN | DP_UP_REQ_EN | DP_UPSTREAM_IS_SRC);
|
|
if (ret < 0) {
|
|
DRM_DEBUG_KMS("mst write failed - undocked during suspend?\n");
|
|
ret = -1;
|
|
goto out_unlock;
|
|
}
|
|
ret = 0;
|
|
} else
|
|
ret = -1;
|
|
|
|
out_unlock:
|
|
mutex_unlock(&mgr->lock);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(drm_dp_mst_topology_mgr_resume);
|
|
|
|
static void drm_dp_get_one_sb_msg(struct drm_dp_mst_topology_mgr *mgr, bool up)
|
|
{
|
|
int len;
|
|
u8 replyblock[32];
|
|
int replylen, origlen, curreply;
|
|
int ret;
|
|
struct drm_dp_sideband_msg_rx *msg;
|
|
int basereg = up ? DP_SIDEBAND_MSG_UP_REQ_BASE : DP_SIDEBAND_MSG_DOWN_REP_BASE;
|
|
msg = up ? &mgr->up_req_recv : &mgr->down_rep_recv;
|
|
|
|
len = min(mgr->max_dpcd_transaction_bytes, 16);
|
|
ret = drm_dp_dpcd_read(mgr->aux, basereg,
|
|
replyblock, len);
|
|
if (ret != len) {
|
|
DRM_DEBUG_KMS("failed to read DPCD down rep %d %d\n", len, ret);
|
|
return;
|
|
}
|
|
ret = drm_dp_sideband_msg_build(msg, replyblock, len, true);
|
|
if (!ret) {
|
|
DRM_DEBUG_KMS("sideband msg build failed %d\n", replyblock[0]);
|
|
return;
|
|
}
|
|
replylen = msg->curchunk_len + msg->curchunk_hdrlen;
|
|
|
|
origlen = replylen;
|
|
replylen -= len;
|
|
curreply = len;
|
|
while (replylen > 0) {
|
|
len = min3(replylen, mgr->max_dpcd_transaction_bytes, 16);
|
|
ret = drm_dp_dpcd_read(mgr->aux, basereg + curreply,
|
|
replyblock, len);
|
|
if (ret != len) {
|
|
DRM_DEBUG_KMS("failed to read a chunk\n");
|
|
}
|
|
ret = drm_dp_sideband_msg_build(msg, replyblock, len, false);
|
|
if (ret == false)
|
|
DRM_DEBUG_KMS("failed to build sideband msg\n");
|
|
curreply += len;
|
|
replylen -= len;
|
|
}
|
|
}
|
|
|
|
static int drm_dp_mst_handle_down_rep(struct drm_dp_mst_topology_mgr *mgr)
|
|
{
|
|
int ret = 0;
|
|
|
|
drm_dp_get_one_sb_msg(mgr, false);
|
|
|
|
if (mgr->down_rep_recv.have_eomt) {
|
|
struct drm_dp_sideband_msg_tx *txmsg;
|
|
struct drm_dp_mst_branch *mstb;
|
|
int slot = -1;
|
|
mstb = drm_dp_get_mst_branch_device(mgr,
|
|
mgr->down_rep_recv.initial_hdr.lct,
|
|
mgr->down_rep_recv.initial_hdr.rad);
|
|
|
|
if (!mstb) {
|
|
DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->down_rep_recv.initial_hdr.lct);
|
|
memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));
|
|
return 0;
|
|
}
|
|
|
|
/* find the message */
|
|
slot = mgr->down_rep_recv.initial_hdr.seqno;
|
|
mutex_lock(&mgr->qlock);
|
|
txmsg = mstb->tx_slots[slot];
|
|
/* remove from slots */
|
|
mutex_unlock(&mgr->qlock);
|
|
|
|
if (!txmsg) {
|
|
DRM_DEBUG_KMS("Got MST reply with no msg %p %d %d %02x %02x\n",
|
|
mstb,
|
|
mgr->down_rep_recv.initial_hdr.seqno,
|
|
mgr->down_rep_recv.initial_hdr.lct,
|
|
mgr->down_rep_recv.initial_hdr.rad[0],
|
|
mgr->down_rep_recv.msg[0]);
|
|
drm_dp_put_mst_branch_device(mstb);
|
|
memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));
|
|
return 0;
|
|
}
|
|
|
|
drm_dp_sideband_parse_reply(&mgr->down_rep_recv, &txmsg->reply);
|
|
if (txmsg->reply.reply_type == 1) {
|
|
DRM_DEBUG_KMS("Got NAK reply: req 0x%02x, reason 0x%02x, nak data 0x%02x\n", txmsg->reply.req_type, txmsg->reply.u.nak.reason, txmsg->reply.u.nak.nak_data);
|
|
}
|
|
|
|
memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));
|
|
drm_dp_put_mst_branch_device(mstb);
|
|
|
|
mutex_lock(&mgr->qlock);
|
|
txmsg->state = DRM_DP_SIDEBAND_TX_RX;
|
|
mstb->tx_slots[slot] = NULL;
|
|
mutex_unlock(&mgr->qlock);
|
|
|
|
// wake_up(&mgr->tx_waitq);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int drm_dp_mst_handle_up_req(struct drm_dp_mst_topology_mgr *mgr)
|
|
{
|
|
int ret = 0;
|
|
drm_dp_get_one_sb_msg(mgr, true);
|
|
|
|
if (mgr->up_req_recv.have_eomt) {
|
|
struct drm_dp_sideband_msg_req_body msg;
|
|
struct drm_dp_mst_branch *mstb;
|
|
bool seqno;
|
|
mstb = drm_dp_get_mst_branch_device(mgr,
|
|
mgr->up_req_recv.initial_hdr.lct,
|
|
mgr->up_req_recv.initial_hdr.rad);
|
|
if (!mstb) {
|
|
DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->up_req_recv.initial_hdr.lct);
|
|
memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));
|
|
return 0;
|
|
}
|
|
|
|
seqno = mgr->up_req_recv.initial_hdr.seqno;
|
|
drm_dp_sideband_parse_req(&mgr->up_req_recv, &msg);
|
|
|
|
if (msg.req_type == DP_CONNECTION_STATUS_NOTIFY) {
|
|
drm_dp_send_up_ack_reply(mgr, mstb, msg.req_type, seqno, false);
|
|
drm_dp_update_port(mstb, &msg.u.conn_stat);
|
|
DRM_DEBUG_KMS("Got CSN: pn: %d ldps:%d ddps: %d mcs: %d ip: %d pdt: %d\n", msg.u.conn_stat.port_number, msg.u.conn_stat.legacy_device_plug_status, msg.u.conn_stat.displayport_device_plug_status, msg.u.conn_stat.message_capability_status, msg.u.conn_stat.input_port, msg.u.conn_stat.peer_device_type);
|
|
(*mgr->cbs->hotplug)(mgr);
|
|
|
|
} else if (msg.req_type == DP_RESOURCE_STATUS_NOTIFY) {
|
|
drm_dp_send_up_ack_reply(mgr, mstb, msg.req_type, seqno, false);
|
|
DRM_DEBUG_KMS("Got RSN: pn: %d avail_pbn %d\n", msg.u.resource_stat.port_number, msg.u.resource_stat.available_pbn);
|
|
}
|
|
|
|
drm_dp_put_mst_branch_device(mstb);
|
|
memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* drm_dp_mst_hpd_irq() - MST hotplug IRQ notify
|
|
* @mgr: manager to notify irq for.
|
|
* @esi: 4 bytes from SINK_COUNT_ESI
|
|
* @handled: whether the hpd interrupt was consumed or not
|
|
*
|
|
* This should be called from the driver when it detects a short IRQ,
|
|
* along with the value of the DEVICE_SERVICE_IRQ_VECTOR_ESI0. The
|
|
* topology manager will process the sideband messages received as a result
|
|
* of this.
|
|
*/
|
|
int drm_dp_mst_hpd_irq(struct drm_dp_mst_topology_mgr *mgr, u8 *esi, bool *handled)
|
|
{
|
|
int ret = 0;
|
|
int sc;
|
|
*handled = false;
|
|
sc = esi[0] & 0x3f;
|
|
|
|
if (sc != mgr->sink_count) {
|
|
mgr->sink_count = sc;
|
|
*handled = true;
|
|
}
|
|
|
|
if (esi[1] & DP_DOWN_REP_MSG_RDY) {
|
|
ret = drm_dp_mst_handle_down_rep(mgr);
|
|
*handled = true;
|
|
}
|
|
|
|
if (esi[1] & DP_UP_REQ_MSG_RDY) {
|
|
ret |= drm_dp_mst_handle_up_req(mgr);
|
|
*handled = true;
|
|
}
|
|
|
|
drm_dp_mst_kick_tx(mgr);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(drm_dp_mst_hpd_irq);
|
|
|
|
/**
|
|
* drm_dp_mst_detect_port() - get connection status for an MST port
|
|
* @mgr: manager for this port
|
|
* @port: unverified pointer to a port
|
|
*
|
|
* This returns the current connection state for a port. It validates the
|
|
* port pointer still exists so the caller doesn't require a reference
|
|
*/
|
|
enum drm_connector_status drm_dp_mst_detect_port(struct drm_connector *connector,
|
|
struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port)
|
|
{
|
|
enum drm_connector_status status = connector_status_disconnected;
|
|
|
|
/* we need to search for the port in the mgr in case its gone */
|
|
port = drm_dp_get_validated_port_ref(mgr, port);
|
|
if (!port)
|
|
return connector_status_disconnected;
|
|
|
|
if (!port->ddps)
|
|
goto out;
|
|
|
|
switch (port->pdt) {
|
|
case DP_PEER_DEVICE_NONE:
|
|
case DP_PEER_DEVICE_MST_BRANCHING:
|
|
break;
|
|
|
|
case DP_PEER_DEVICE_SST_SINK:
|
|
status = connector_status_connected;
|
|
/* for logical ports - cache the EDID */
|
|
if (port->port_num >= 8 && !port->cached_edid) {
|
|
port->cached_edid = drm_get_edid(connector, &port->aux.ddc);
|
|
}
|
|
break;
|
|
case DP_PEER_DEVICE_DP_LEGACY_CONV:
|
|
if (port->ldps)
|
|
status = connector_status_connected;
|
|
break;
|
|
}
|
|
out:
|
|
drm_dp_put_port(port);
|
|
return status;
|
|
}
|
|
EXPORT_SYMBOL(drm_dp_mst_detect_port);
|
|
|
|
/**
|
|
* drm_dp_mst_get_edid() - get EDID for an MST port
|
|
* @connector: toplevel connector to get EDID for
|
|
* @mgr: manager for this port
|
|
* @port: unverified pointer to a port.
|
|
*
|
|
* This returns an EDID for the port connected to a connector,
|
|
* It validates the pointer still exists so the caller doesn't require a
|
|
* reference.
|
|
*/
|
|
struct edid *drm_dp_mst_get_edid(struct drm_connector *connector, struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port)
|
|
{
|
|
struct edid *edid = NULL;
|
|
|
|
/* we need to search for the port in the mgr in case its gone */
|
|
port = drm_dp_get_validated_port_ref(mgr, port);
|
|
if (!port)
|
|
return NULL;
|
|
|
|
if (port->cached_edid)
|
|
edid = drm_edid_duplicate(port->cached_edid);
|
|
else
|
|
edid = drm_get_edid(connector, &port->aux.ddc);
|
|
|
|
drm_mode_connector_set_tile_property(connector);
|
|
drm_dp_put_port(port);
|
|
return edid;
|
|
}
|
|
EXPORT_SYMBOL(drm_dp_mst_get_edid);
|
|
|
|
/**
|
|
* drm_dp_find_vcpi_slots() - find slots for this PBN value
|
|
* @mgr: manager to use
|
|
* @pbn: payload bandwidth to convert into slots.
|
|
*/
|
|
int drm_dp_find_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr,
|
|
int pbn)
|
|
{
|
|
int num_slots;
|
|
|
|
num_slots = DIV_ROUND_UP(pbn, mgr->pbn_div);
|
|
|
|
if (num_slots > mgr->avail_slots)
|
|
return -ENOSPC;
|
|
return num_slots;
|
|
}
|
|
EXPORT_SYMBOL(drm_dp_find_vcpi_slots);
|
|
|
|
static int drm_dp_init_vcpi(struct drm_dp_mst_topology_mgr *mgr,
|
|
struct drm_dp_vcpi *vcpi, int pbn)
|
|
{
|
|
int num_slots;
|
|
int ret;
|
|
|
|
num_slots = DIV_ROUND_UP(pbn, mgr->pbn_div);
|
|
|
|
if (num_slots > mgr->avail_slots)
|
|
return -ENOSPC;
|
|
|
|
vcpi->pbn = pbn;
|
|
vcpi->aligned_pbn = num_slots * mgr->pbn_div;
|
|
vcpi->num_slots = num_slots;
|
|
|
|
ret = drm_dp_mst_assign_payload_id(mgr, vcpi);
|
|
if (ret < 0)
|
|
return ret;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* drm_dp_mst_allocate_vcpi() - Allocate a virtual channel
|
|
* @mgr: manager for this port
|
|
* @port: port to allocate a virtual channel for.
|
|
* @pbn: payload bandwidth number to request
|
|
* @slots: returned number of slots for this PBN.
|
|
*/
|
|
bool drm_dp_mst_allocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port, int pbn, int *slots)
|
|
{
|
|
int ret;
|
|
|
|
port = drm_dp_get_validated_port_ref(mgr, port);
|
|
if (!port)
|
|
return false;
|
|
|
|
if (port->vcpi.vcpi > 0) {
|
|
DRM_DEBUG_KMS("payload: vcpi %d already allocated for pbn %d - requested pbn %d\n", port->vcpi.vcpi, port->vcpi.pbn, pbn);
|
|
if (pbn == port->vcpi.pbn) {
|
|
*slots = port->vcpi.num_slots;
|
|
return true;
|
|
}
|
|
}
|
|
|
|
ret = drm_dp_init_vcpi(mgr, &port->vcpi, pbn);
|
|
if (ret) {
|
|
DRM_DEBUG_KMS("failed to init vcpi %d %d %d\n", DIV_ROUND_UP(pbn, mgr->pbn_div), mgr->avail_slots, ret);
|
|
goto out;
|
|
}
|
|
DRM_DEBUG_KMS("initing vcpi for %d %d\n", pbn, port->vcpi.num_slots);
|
|
*slots = port->vcpi.num_slots;
|
|
|
|
drm_dp_put_port(port);
|
|
return true;
|
|
out:
|
|
return false;
|
|
}
|
|
EXPORT_SYMBOL(drm_dp_mst_allocate_vcpi);
|
|
|
|
/**
|
|
* drm_dp_mst_reset_vcpi_slots() - Reset number of slots to 0 for VCPI
|
|
* @mgr: manager for this port
|
|
* @port: unverified pointer to a port.
|
|
*
|
|
* This just resets the number of slots for the ports VCPI for later programming.
|
|
*/
|
|
void drm_dp_mst_reset_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port)
|
|
{
|
|
port = drm_dp_get_validated_port_ref(mgr, port);
|
|
if (!port)
|
|
return;
|
|
port->vcpi.num_slots = 0;
|
|
drm_dp_put_port(port);
|
|
}
|
|
EXPORT_SYMBOL(drm_dp_mst_reset_vcpi_slots);
|
|
|
|
/**
|
|
* drm_dp_mst_deallocate_vcpi() - deallocate a VCPI
|
|
* @mgr: manager for this port
|
|
* @port: unverified port to deallocate vcpi for
|
|
*/
|
|
void drm_dp_mst_deallocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port)
|
|
{
|
|
port = drm_dp_get_validated_port_ref(mgr, port);
|
|
if (!port)
|
|
return;
|
|
|
|
drm_dp_mst_put_payload_id(mgr, port->vcpi.vcpi);
|
|
port->vcpi.num_slots = 0;
|
|
port->vcpi.pbn = 0;
|
|
port->vcpi.aligned_pbn = 0;
|
|
port->vcpi.vcpi = 0;
|
|
drm_dp_put_port(port);
|
|
}
|
|
EXPORT_SYMBOL(drm_dp_mst_deallocate_vcpi);
|
|
|
|
static int drm_dp_dpcd_write_payload(struct drm_dp_mst_topology_mgr *mgr,
|
|
int id, struct drm_dp_payload *payload)
|
|
{
|
|
u8 payload_alloc[3], status;
|
|
int ret;
|
|
int retries = 0;
|
|
|
|
drm_dp_dpcd_writeb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS,
|
|
DP_PAYLOAD_TABLE_UPDATED);
|
|
|
|
payload_alloc[0] = id;
|
|
payload_alloc[1] = payload->start_slot;
|
|
payload_alloc[2] = payload->num_slots;
|
|
|
|
ret = drm_dp_dpcd_write(mgr->aux, DP_PAYLOAD_ALLOCATE_SET, payload_alloc, 3);
|
|
if (ret != 3) {
|
|
DRM_DEBUG_KMS("failed to write payload allocation %d\n", ret);
|
|
goto fail;
|
|
}
|
|
|
|
retry:
|
|
ret = drm_dp_dpcd_readb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, &status);
|
|
if (ret < 0) {
|
|
DRM_DEBUG_KMS("failed to read payload table status %d\n", ret);
|
|
goto fail;
|
|
}
|
|
|
|
if (!(status & DP_PAYLOAD_TABLE_UPDATED)) {
|
|
retries++;
|
|
if (retries < 20) {
|
|
usleep_range(10000, 20000);
|
|
goto retry;
|
|
}
|
|
DRM_DEBUG_KMS("status not set after read payload table status %d\n", status);
|
|
ret = -EINVAL;
|
|
goto fail;
|
|
}
|
|
ret = 0;
|
|
fail:
|
|
return ret;
|
|
}
|
|
|
|
|
|
/**
|
|
* drm_dp_check_act_status() - Check ACT handled status.
|
|
* @mgr: manager to use
|
|
*
|
|
* Check the payload status bits in the DPCD for ACT handled completion.
|
|
*/
|
|
int drm_dp_check_act_status(struct drm_dp_mst_topology_mgr *mgr)
|
|
{
|
|
u8 status;
|
|
int ret;
|
|
int count = 0;
|
|
|
|
do {
|
|
ret = drm_dp_dpcd_readb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, &status);
|
|
|
|
if (ret < 0) {
|
|
DRM_DEBUG_KMS("failed to read payload table status %d\n", ret);
|
|
goto fail;
|
|
}
|
|
|
|
if (status & DP_PAYLOAD_ACT_HANDLED)
|
|
break;
|
|
count++;
|
|
udelay(100);
|
|
|
|
} while (count < 30);
|
|
|
|
if (!(status & DP_PAYLOAD_ACT_HANDLED)) {
|
|
DRM_DEBUG_KMS("failed to get ACT bit %d after %d retries\n", status, count);
|
|
ret = -EINVAL;
|
|
goto fail;
|
|
}
|
|
return 0;
|
|
fail:
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(drm_dp_check_act_status);
|
|
|
|
/**
|
|
* drm_dp_calc_pbn_mode() - Calculate the PBN for a mode.
|
|
* @clock: dot clock for the mode
|
|
* @bpp: bpp for the mode.
|
|
*
|
|
* This uses the formula in the spec to calculate the PBN value for a mode.
|
|
*/
|
|
int drm_dp_calc_pbn_mode(int clock, int bpp)
|
|
{
|
|
fixed20_12 pix_bw;
|
|
fixed20_12 fbpp;
|
|
fixed20_12 result;
|
|
fixed20_12 margin, tmp;
|
|
u32 res;
|
|
|
|
pix_bw.full = dfixed_const(clock);
|
|
fbpp.full = dfixed_const(bpp);
|
|
tmp.full = dfixed_const(8);
|
|
fbpp.full = dfixed_div(fbpp, tmp);
|
|
|
|
result.full = dfixed_mul(pix_bw, fbpp);
|
|
margin.full = dfixed_const(54);
|
|
tmp.full = dfixed_const(64);
|
|
margin.full = dfixed_div(margin, tmp);
|
|
result.full = dfixed_div(result, margin);
|
|
|
|
margin.full = dfixed_const(1006);
|
|
tmp.full = dfixed_const(1000);
|
|
margin.full = dfixed_div(margin, tmp);
|
|
result.full = dfixed_mul(result, margin);
|
|
|
|
result.full = dfixed_div(result, tmp);
|
|
result.full = dfixed_ceil(result);
|
|
res = dfixed_trunc(result);
|
|
return res;
|
|
}
|
|
EXPORT_SYMBOL(drm_dp_calc_pbn_mode);
|
|
|
|
static int test_calc_pbn_mode(void)
|
|
{
|
|
int ret;
|
|
ret = drm_dp_calc_pbn_mode(154000, 30);
|
|
if (ret != 689)
|
|
return -EINVAL;
|
|
ret = drm_dp_calc_pbn_mode(234000, 30);
|
|
if (ret != 1047)
|
|
return -EINVAL;
|
|
return 0;
|
|
}
|
|
|
|
/* we want to kick the TX after we've ack the up/down IRQs. */
|
|
static void drm_dp_mst_kick_tx(struct drm_dp_mst_topology_mgr *mgr)
|
|
{
|
|
// queue_work(system_long_wq, &mgr->tx_work);
|
|
}
|
|
|
|
static void drm_dp_mst_dump_mstb(struct seq_file *m,
|
|
struct drm_dp_mst_branch *mstb)
|
|
{
|
|
struct drm_dp_mst_port *port;
|
|
int tabs = mstb->lct;
|
|
char prefix[10];
|
|
int i;
|
|
|
|
for (i = 0; i < tabs; i++)
|
|
prefix[i] = '\t';
|
|
prefix[i] = '\0';
|
|
|
|
// seq_printf(m, "%smst: %p, %d\n", prefix, mstb, mstb->num_ports);
|
|
// list_for_each_entry(port, &mstb->ports, next) {
|
|
// seq_printf(m, "%sport: %d: ddps: %d ldps: %d, %p, conn: %p\n", prefix, port->port_num, port->ddps, port->ldps, port, port->connector);
|
|
// if (port->mstb)
|
|
// drm_dp_mst_dump_mstb(m, port->mstb);
|
|
// }
|
|
}
|
|
|
|
static bool dump_dp_payload_table(struct drm_dp_mst_topology_mgr *mgr,
|
|
char *buf)
|
|
{
|
|
int ret;
|
|
int i;
|
|
for (i = 0; i < 4; i++) {
|
|
ret = drm_dp_dpcd_read(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS + (i * 16), &buf[i * 16], 16);
|
|
if (ret != 16)
|
|
break;
|
|
}
|
|
if (i == 4)
|
|
return true;
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* drm_dp_mst_dump_topology(): dump topology to seq file.
|
|
* @m: seq_file to dump output to
|
|
* @mgr: manager to dump current topology for.
|
|
*
|
|
* helper to dump MST topology to a seq file for debugfs.
|
|
*/
|
|
void drm_dp_mst_dump_topology(struct seq_file *m,
|
|
struct drm_dp_mst_topology_mgr *mgr)
|
|
{
|
|
int i;
|
|
struct drm_dp_mst_port *port;
|
|
mutex_lock(&mgr->lock);
|
|
if (mgr->mst_primary)
|
|
drm_dp_mst_dump_mstb(m, mgr->mst_primary);
|
|
|
|
/* dump VCPIs */
|
|
mutex_unlock(&mgr->lock);
|
|
|
|
|
|
|
|
}
|
|
EXPORT_SYMBOL(drm_dp_mst_dump_topology);
|
|
|
|
static void drm_dp_tx_work(struct work_struct *work)
|
|
{
|
|
struct drm_dp_mst_topology_mgr *mgr = container_of(work, struct drm_dp_mst_topology_mgr, tx_work);
|
|
|
|
mutex_lock(&mgr->qlock);
|
|
if (mgr->tx_down_in_progress)
|
|
process_single_down_tx_qlock(mgr);
|
|
mutex_unlock(&mgr->qlock);
|
|
}
|
|
|
|
/**
|
|
* drm_dp_mst_topology_mgr_init - initialise a topology manager
|
|
* @mgr: manager struct to initialise
|
|
* @dev: device providing this structure - for i2c addition.
|
|
* @aux: DP helper aux channel to talk to this device
|
|
* @max_dpcd_transaction_bytes: hw specific DPCD transaction limit
|
|
* @max_payloads: maximum number of payloads this GPU can source
|
|
* @conn_base_id: the connector object ID the MST device is connected to.
|
|
*
|
|
* Return 0 for success, or negative error code on failure
|
|
*/
|
|
int drm_dp_mst_topology_mgr_init(struct drm_dp_mst_topology_mgr *mgr,
|
|
struct device *dev, struct drm_dp_aux *aux,
|
|
int max_dpcd_transaction_bytes,
|
|
int max_payloads, int conn_base_id)
|
|
{
|
|
mutex_init(&mgr->lock);
|
|
mutex_init(&mgr->qlock);
|
|
mutex_init(&mgr->payload_lock);
|
|
INIT_LIST_HEAD(&mgr->tx_msg_upq);
|
|
INIT_LIST_HEAD(&mgr->tx_msg_downq);
|
|
INIT_WORK(&mgr->work, drm_dp_mst_link_probe_work);
|
|
INIT_WORK(&mgr->tx_work, drm_dp_tx_work);
|
|
// init_waitqueue_head(&mgr->tx_waitq);
|
|
mgr->dev = dev;
|
|
mgr->aux = aux;
|
|
mgr->max_dpcd_transaction_bytes = max_dpcd_transaction_bytes;
|
|
mgr->max_payloads = max_payloads;
|
|
mgr->conn_base_id = conn_base_id;
|
|
mgr->payloads = kcalloc(max_payloads, sizeof(struct drm_dp_payload), GFP_KERNEL);
|
|
if (!mgr->payloads)
|
|
return -ENOMEM;
|
|
mgr->proposed_vcpis = kcalloc(max_payloads, sizeof(struct drm_dp_vcpi *), GFP_KERNEL);
|
|
if (!mgr->proposed_vcpis)
|
|
return -ENOMEM;
|
|
set_bit(0, &mgr->payload_mask);
|
|
test_calc_pbn_mode();
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(drm_dp_mst_topology_mgr_init);
|
|
|
|
/**
|
|
* drm_dp_mst_topology_mgr_destroy() - destroy topology manager.
|
|
* @mgr: manager to destroy
|
|
*/
|
|
void drm_dp_mst_topology_mgr_destroy(struct drm_dp_mst_topology_mgr *mgr)
|
|
{
|
|
mutex_lock(&mgr->payload_lock);
|
|
kfree(mgr->payloads);
|
|
mgr->payloads = NULL;
|
|
kfree(mgr->proposed_vcpis);
|
|
mgr->proposed_vcpis = NULL;
|
|
mutex_unlock(&mgr->payload_lock);
|
|
mgr->dev = NULL;
|
|
mgr->aux = NULL;
|
|
}
|
|
EXPORT_SYMBOL(drm_dp_mst_topology_mgr_destroy);
|
|
|
|
/* I2C device */
|
|
static int drm_dp_mst_i2c_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs,
|
|
int num)
|
|
{
|
|
struct drm_dp_aux *aux = adapter->algo_data;
|
|
struct drm_dp_mst_port *port = container_of(aux, struct drm_dp_mst_port, aux);
|
|
struct drm_dp_mst_branch *mstb;
|
|
struct drm_dp_mst_topology_mgr *mgr = port->mgr;
|
|
unsigned int i;
|
|
bool reading = false;
|
|
struct drm_dp_sideband_msg_req_body msg;
|
|
struct drm_dp_sideband_msg_tx *txmsg = NULL;
|
|
int ret;
|
|
|
|
mstb = drm_dp_get_validated_mstb_ref(mgr, port->parent);
|
|
if (!mstb)
|
|
return -EREMOTEIO;
|
|
|
|
/* construct i2c msg */
|
|
/* see if last msg is a read */
|
|
if (msgs[num - 1].flags & I2C_M_RD)
|
|
reading = true;
|
|
|
|
if (!reading) {
|
|
DRM_DEBUG_KMS("Unsupported I2C transaction for MST device\n");
|
|
ret = -EIO;
|
|
goto out;
|
|
}
|
|
|
|
msg.req_type = DP_REMOTE_I2C_READ;
|
|
msg.u.i2c_read.num_transactions = num - 1;
|
|
msg.u.i2c_read.port_number = port->port_num;
|
|
for (i = 0; i < num - 1; i++) {
|
|
msg.u.i2c_read.transactions[i].i2c_dev_id = msgs[i].addr;
|
|
msg.u.i2c_read.transactions[i].num_bytes = msgs[i].len;
|
|
msg.u.i2c_read.transactions[i].bytes = msgs[i].buf;
|
|
}
|
|
msg.u.i2c_read.read_i2c_device_id = msgs[num - 1].addr;
|
|
msg.u.i2c_read.num_bytes_read = msgs[num - 1].len;
|
|
|
|
txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
|
|
if (!txmsg) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
txmsg->dst = mstb;
|
|
drm_dp_encode_sideband_req(&msg, txmsg);
|
|
|
|
drm_dp_queue_down_tx(mgr, txmsg);
|
|
|
|
ret = drm_dp_mst_wait_tx_reply(mstb, txmsg);
|
|
if (ret > 0) {
|
|
|
|
if (txmsg->reply.reply_type == 1) { /* got a NAK back */
|
|
ret = -EREMOTEIO;
|
|
goto out;
|
|
}
|
|
if (txmsg->reply.u.remote_i2c_read_ack.num_bytes != msgs[num - 1].len) {
|
|
ret = -EIO;
|
|
goto out;
|
|
}
|
|
memcpy(msgs[num - 1].buf, txmsg->reply.u.remote_i2c_read_ack.bytes, msgs[num - 1].len);
|
|
ret = num;
|
|
}
|
|
out:
|
|
kfree(txmsg);
|
|
drm_dp_put_mst_branch_device(mstb);
|
|
return ret;
|
|
}
|
|
|
|
static u32 drm_dp_mst_i2c_functionality(struct i2c_adapter *adapter)
|
|
{
|
|
return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL |
|
|
I2C_FUNC_SMBUS_READ_BLOCK_DATA |
|
|
I2C_FUNC_SMBUS_BLOCK_PROC_CALL |
|
|
I2C_FUNC_10BIT_ADDR;
|
|
}
|
|
|
|
static const struct i2c_algorithm drm_dp_mst_i2c_algo = {
|
|
.functionality = drm_dp_mst_i2c_functionality,
|
|
.master_xfer = drm_dp_mst_i2c_xfer,
|
|
};
|
|
|
|
/**
|
|
* drm_dp_mst_register_i2c_bus() - register an I2C adapter for I2C-over-AUX
|
|
* @aux: DisplayPort AUX channel
|
|
*
|
|
* Returns 0 on success or a negative error code on failure.
|
|
*/
|
|
static int drm_dp_mst_register_i2c_bus(struct drm_dp_aux *aux)
|
|
{
|
|
aux->ddc.algo = &drm_dp_mst_i2c_algo;
|
|
aux->ddc.algo_data = aux;
|
|
aux->ddc.retries = 3;
|
|
|
|
aux->ddc.class = I2C_CLASS_DDC;
|
|
aux->ddc.owner = THIS_MODULE;
|
|
aux->ddc.dev.parent = aux->dev;
|
|
|
|
return i2c_add_adapter(&aux->ddc);
|
|
}
|
|
|
|
/**
|
|
* drm_dp_mst_unregister_i2c_bus() - unregister an I2C-over-AUX adapter
|
|
* @aux: DisplayPort AUX channel
|
|
*/
|
|
static void drm_dp_mst_unregister_i2c_bus(struct drm_dp_aux *aux)
|
|
{
|
|
i2c_del_adapter(&aux->ddc);
|
|
}
|