343 lines
11 KiB
C
343 lines
11 KiB
C
/**
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* \file drm_irq.c
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* IRQ support
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*
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* \author Rickard E. (Rik) Faith <faith@valinux.com>
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* \author Gareth Hughes <gareth@valinux.com>
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*/
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/*
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* Created: Fri Mar 19 14:30:16 1999 by faith@valinux.com
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*
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* Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
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* Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <drm/drmP.h>
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#include <asm/div64.h>
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//#include "drm_trace.h"
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//#include <linux/interrupt.h> /* For task queue support */
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#include <linux/slab.h>
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//#include <linux/vgaarb.h>
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#include <linux/export.h>
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/* Access macro for slots in vblank timestamp ringbuffer. */
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#define vblanktimestamp(dev, crtc, count) \
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((dev)->vblank[crtc].time[(count) % DRM_VBLANKTIME_RBSIZE])
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/* Retry timestamp calculation up to 3 times to satisfy
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* drm_timestamp_precision before giving up.
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*/
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#define DRM_TIMESTAMP_MAXRETRIES 3
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/* Threshold in nanoseconds for detection of redundant
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* vblank irq in drm_handle_vblank(). 1 msec should be ok.
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*/
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#define DRM_REDUNDANT_VBLIRQ_THRESH_NS 1000000
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irqreturn_t device_irq_handler(struct drm_device *dev)
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{
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// printf("video irq\n");
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// printf("device %p driver %p handler %p\n", dev, dev->driver, dev->driver->irq_handler) ;
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return dev->driver->irq_handler(0, dev);
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}
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/**
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* Install IRQ handler.
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*
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* \param dev DRM device.
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*
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* Initializes the IRQ related data. Installs the handler, calling the driver
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* \c irq_preinstall() and \c irq_postinstall() functions
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* before and after the installation.
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*/
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int drm_irq_install(struct drm_device *dev)
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{
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int ret;
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unsigned long sh_flags = 0;
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char *irqname;
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if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
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return -EINVAL;
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if (drm_dev_to_irq(dev) == 0)
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return -EINVAL;
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mutex_lock(&dev->struct_mutex);
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/* Driver must have been initialized */
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if (!dev->dev_private) {
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mutex_unlock(&dev->struct_mutex);
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return -EINVAL;
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}
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if (dev->irq_enabled) {
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mutex_unlock(&dev->struct_mutex);
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return -EBUSY;
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}
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dev->irq_enabled = true;
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mutex_unlock(&dev->struct_mutex);
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DRM_DEBUG("irq=%d\n", drm_dev_to_irq(dev));
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/* Before installing handler */
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if (dev->driver->irq_preinstall)
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dev->driver->irq_preinstall(dev);
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ret = !AttachIntHandler(drm_dev_to_irq(dev), device_irq_handler, (u32)dev);
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/* After installing handler */
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if (dev->driver->irq_postinstall)
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ret = dev->driver->irq_postinstall(dev);
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if (ret < 0) {
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dev->irq_enabled = 0;
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DRM_ERROR(__FUNCTION__);
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}
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u16_t cmd = PciRead16(dev->pdev->busnr, dev->pdev->devfn, 4);
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cmd&= ~(1<<10);
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PciWrite16(dev->pdev->busnr, dev->pdev->devfn, 4, cmd);
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return ret;
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}
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EXPORT_SYMBOL(drm_irq_install);
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u64 div64_u64(u64 dividend, u64 divisor)
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{
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u32 high, d;
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high = divisor >> 32;
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if (high) {
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unsigned int shift = fls(high);
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d = divisor >> shift;
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dividend >>= shift;
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} else
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d = divisor;
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return div_u64(dividend, d);
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}
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/**
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* drm_calc_timestamping_constants - Calculate vblank timestamp constants
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*
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* @crtc drm_crtc whose timestamp constants should be updated.
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* @mode display mode containing the scanout timings
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*
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* Calculate and store various constants which are later
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* needed by vblank and swap-completion timestamping, e.g,
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* by drm_calc_vbltimestamp_from_scanoutpos(). They are
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* derived from crtc's true scanout timing, so they take
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* things like panel scaling or other adjustments into account.
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*/
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void drm_calc_timestamping_constants(struct drm_crtc *crtc,
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const struct drm_display_mode *mode)
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{
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int linedur_ns = 0, pixeldur_ns = 0, framedur_ns = 0;
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int dotclock = mode->crtc_clock;
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/* Valid dotclock? */
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if (dotclock > 0) {
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int frame_size = mode->crtc_htotal * mode->crtc_vtotal;
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/*
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* Convert scanline length in pixels and video
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* dot clock to line duration, frame duration
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* and pixel duration in nanoseconds:
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*/
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pixeldur_ns = 1000000 / dotclock;
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linedur_ns = div_u64((u64) mode->crtc_htotal * 1000000, dotclock);
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framedur_ns = div_u64((u64) frame_size * 1000000, dotclock);
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/*
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* Fields of interlaced scanout modes are only half a frame duration.
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*/
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if (mode->flags & DRM_MODE_FLAG_INTERLACE)
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framedur_ns /= 2;
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} else
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DRM_ERROR("crtc %d: Can't calculate constants, dotclock = 0!\n",
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crtc->base.id);
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crtc->pixeldur_ns = pixeldur_ns;
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crtc->linedur_ns = linedur_ns;
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crtc->framedur_ns = framedur_ns;
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DRM_DEBUG("crtc %d: hwmode: htotal %d, vtotal %d, vdisplay %d\n",
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crtc->base.id, mode->crtc_htotal,
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mode->crtc_vtotal, mode->crtc_vdisplay);
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DRM_DEBUG("crtc %d: clock %d kHz framedur %d linedur %d, pixeldur %d\n",
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crtc->base.id, dotclock, framedur_ns,
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linedur_ns, pixeldur_ns);
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}
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EXPORT_SYMBOL(drm_calc_timestamping_constants);
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/**
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* drm_calc_vbltimestamp_from_scanoutpos - helper routine for kms
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* drivers. Implements calculation of exact vblank timestamps from
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* given drm_display_mode timings and current video scanout position
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* of a crtc. This can be called from within get_vblank_timestamp()
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* implementation of a kms driver to implement the actual timestamping.
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*
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* Should return timestamps conforming to the OML_sync_control OpenML
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* extension specification. The timestamp corresponds to the end of
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* the vblank interval, aka start of scanout of topmost-leftmost display
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* pixel in the following video frame.
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*
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* Requires support for optional dev->driver->get_scanout_position()
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* in kms driver, plus a bit of setup code to provide a drm_display_mode
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* that corresponds to the true scanout timing.
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*
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* The current implementation only handles standard video modes. It
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* returns as no operation if a doublescan or interlaced video mode is
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* active. Higher level code is expected to handle this.
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*
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* @dev: DRM device.
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* @crtc: Which crtc's vblank timestamp to retrieve.
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* @max_error: Desired maximum allowable error in timestamps (nanosecs).
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* On return contains true maximum error of timestamp.
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* @vblank_time: Pointer to struct timeval which should receive the timestamp.
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* @flags: Flags to pass to driver:
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* 0 = Default.
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* DRM_CALLED_FROM_VBLIRQ = If function is called from vbl irq handler.
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* @refcrtc: drm_crtc* of crtc which defines scanout timing.
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* @mode: mode which defines the scanout timings
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*
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* Returns negative value on error, failure or if not supported in current
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* video mode:
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*
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* -EINVAL - Invalid crtc.
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* -EAGAIN - Temporary unavailable, e.g., called before initial modeset.
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* -ENOTSUPP - Function not supported in current display mode.
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* -EIO - Failed, e.g., due to failed scanout position query.
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*
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* Returns or'ed positive status flags on success:
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*
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* DRM_VBLANKTIME_SCANOUTPOS_METHOD - Signal this method used for timestamping.
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* DRM_VBLANKTIME_INVBL - Timestamp taken while scanout was in vblank interval.
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*
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*/
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int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev, int crtc,
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int *max_error,
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struct timeval *vblank_time,
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unsigned flags,
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const struct drm_crtc *refcrtc,
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const struct drm_display_mode *mode)
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{
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struct timeval tv_etime;
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int vbl_status;
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int vpos, hpos, i;
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int framedur_ns, linedur_ns, pixeldur_ns, delta_ns, duration_ns;
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bool invbl;
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if (crtc < 0 || crtc >= dev->num_crtcs) {
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DRM_ERROR("Invalid crtc %d\n", crtc);
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return -EINVAL;
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}
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/* Scanout position query not supported? Should not happen. */
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if (!dev->driver->get_scanout_position) {
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DRM_ERROR("Called from driver w/o get_scanout_position()!?\n");
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return -EIO;
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}
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/* Durations of frames, lines, pixels in nanoseconds. */
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framedur_ns = refcrtc->framedur_ns;
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linedur_ns = refcrtc->linedur_ns;
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pixeldur_ns = refcrtc->pixeldur_ns;
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/* If mode timing undefined, just return as no-op:
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* Happens during initial modesetting of a crtc.
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*/
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if (framedur_ns == 0) {
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DRM_DEBUG("crtc %d: Noop due to uninitialized mode.\n", crtc);
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return -EAGAIN;
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}
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return -EIO;
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}
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EXPORT_SYMBOL(drm_calc_vbltimestamp_from_scanoutpos);
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/**
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* drm_vblank_pre_modeset - account for vblanks across mode sets
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* @dev: DRM device
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* @crtc: CRTC in question
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*
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* Account for vblank events across mode setting events, which will likely
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* reset the hardware frame counter.
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*/
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void drm_vblank_pre_modeset(struct drm_device *dev, int crtc)
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{
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#if 0
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/* vblank is not initialized (IRQ not installed ?) */
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if (!dev->num_crtcs)
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return;
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/*
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* To avoid all the problems that might happen if interrupts
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* were enabled/disabled around or between these calls, we just
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* have the kernel take a reference on the CRTC (just once though
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* to avoid corrupting the count if multiple, mismatch calls occur),
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* so that interrupts remain enabled in the interim.
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*/
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if (!dev->vblank[crtc].inmodeset) {
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dev->vblank[crtc].inmodeset = 0x1;
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if (drm_vblank_get(dev, crtc) == 0)
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dev->vblank[crtc].inmodeset |= 0x2;
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}
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#endif
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}
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EXPORT_SYMBOL(drm_vblank_pre_modeset);
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void drm_vblank_post_modeset(struct drm_device *dev, int crtc)
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{
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#if 0
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unsigned long irqflags;
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/* vblank is not initialized (IRQ not installed ?), or has been freed */
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if (!dev->num_crtcs)
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return;
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if (dev->vblank[crtc].inmodeset) {
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spin_lock_irqsave(&dev->vbl_lock, irqflags);
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dev->vblank_disable_allowed = true;
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spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
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if (dev->vblank[crtc].inmodeset & 0x2)
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drm_vblank_put(dev, crtc);
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dev->vblank[crtc].inmodeset = 0;
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}
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#endif
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}
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EXPORT_SYMBOL(drm_vblank_post_modeset);
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