137 lines
4.5 KiB
C
137 lines
4.5 KiB
C
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/**
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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 "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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/* Access macro for slots in vblank timestamp ringbuffer. */
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#define vblanktimestamp(dev, crtc, count) ( \
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(dev)->_vblank_time[(crtc) * DRM_VBLANKTIME_RBSIZE + \
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((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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static inline u64 div_u64(u64 dividend, u32 divisor)
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{
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u32 remainder;
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return div_u64_rem(dividend, divisor, &remainder);
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}
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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 and
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* store various constants which are later needed by
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* vblank and swap-completion timestamping, e.g, by
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* drm_calc_vbltimestamp_from_scanoutpos().
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* They are derived from crtc's true scanout timing,
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* so they take things like panel scaling or other
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* adjustments into account.
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*
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* @crtc drm_crtc whose timestamp constants should be updated.
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*
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*/
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void drm_calc_timestamping_constants(struct drm_crtc *crtc)
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{
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s64 linedur_ns = 0, pixeldur_ns = 0, framedur_ns = 0;
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u64 dotclock;
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/* Dot clock in Hz: */
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dotclock = (u64) crtc->hwmode.clock * 1000;
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/* Fields of interlaced scanout modes are only halve a frame duration.
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* Double the dotclock to get halve the frame-/line-/pixelduration.
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*/
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if (crtc->hwmode.flags & DRM_MODE_FLAG_INTERLACE)
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dotclock *= 2;
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/* Valid dotclock? */
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if (dotclock > 0) {
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/* Convert scanline length in pixels and video dot clock to
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* line duration, frame duration and pixel duration in
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* nanoseconds:
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*/
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pixeldur_ns = (s64) div64_u64(1000000000, dotclock);
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linedur_ns = (s64) div64_u64(((u64) crtc->hwmode.crtc_htotal *
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1000000000), dotclock);
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framedur_ns = (s64) crtc->hwmode.crtc_vtotal * linedur_ns;
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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, crtc->hwmode.crtc_htotal,
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crtc->hwmode.crtc_vtotal, crtc->hwmode.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, (int) dotclock/1000, (int) framedur_ns,
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(int) linedur_ns, (int) pixeldur_ns);
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}
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