Subversion Repositories Kolibri OS

Rev

Rev 3480 | Go to most recent revision | Blame | Compare with Previous | Last modification | View Log | Download | RSS feed

  1. /**
  2.  * \file drm_irq.c
  3.  * IRQ support
  4.  *
  5.  * \author Rickard E. (Rik) Faith <faith@valinux.com>
  6.  * \author Gareth Hughes <gareth@valinux.com>
  7.  */
  8.  
  9. /*
  10.  * Created: Fri Mar 19 14:30:16 1999 by faith@valinux.com
  11.  *
  12.  * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
  13.  * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
  14.  * All Rights Reserved.
  15.  *
  16.  * Permission is hereby granted, free of charge, to any person obtaining a
  17.  * copy of this software and associated documentation files (the "Software"),
  18.  * to deal in the Software without restriction, including without limitation
  19.  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  20.  * and/or sell copies of the Software, and to permit persons to whom the
  21.  * Software is furnished to do so, subject to the following conditions:
  22.  *
  23.  * The above copyright notice and this permission notice (including the next
  24.  * paragraph) shall be included in all copies or substantial portions of the
  25.  * Software.
  26.  *
  27.  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  28.  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  29.  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  30.  * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  31.  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  32.  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  33.  * OTHER DEALINGS IN THE SOFTWARE.
  34.  */
  35.  
  36. #include "drmP.h"
  37. #include <asm/div64.h>
  38. //#include "drm_trace.h"
  39.  
  40. //#include <linux/interrupt.h>   /* For task queue support */
  41. #include <linux/slab.h>
  42.  
  43. //#include <linux/vgaarb.h>
  44.  
  45. /* Access macro for slots in vblank timestamp ringbuffer. */
  46. #define vblanktimestamp(dev, crtc, count) ( \
  47.         (dev)->_vblank_time[(crtc) * DRM_VBLANKTIME_RBSIZE + \
  48.         ((count) % DRM_VBLANKTIME_RBSIZE)])
  49.  
  50. /* Retry timestamp calculation up to 3 times to satisfy
  51.  * drm_timestamp_precision before giving up.
  52.  */
  53. #define DRM_TIMESTAMP_MAXRETRIES 3
  54.  
  55. /* Threshold in nanoseconds for detection of redundant
  56.  * vblank irq in drm_handle_vblank(). 1 msec should be ok.
  57.  */
  58. #define DRM_REDUNDANT_VBLIRQ_THRESH_NS 1000000
  59.  
  60.  
  61. static inline u64 div_u64(u64 dividend, u32 divisor)
  62. {
  63.         u32 remainder;
  64.         return div_u64_rem(dividend, divisor, &remainder);
  65. }
  66.  
  67.  
  68. u64 div64_u64(u64 dividend, u64 divisor)
  69. {
  70.         u32 high, d;
  71.  
  72.         high = divisor >> 32;
  73.         if (high) {
  74.                 unsigned int shift = fls(high);
  75.  
  76.                 d = divisor >> shift;
  77.                 dividend >>= shift;
  78.         } else
  79.                 d = divisor;
  80.  
  81.         return div_u64(dividend, d);
  82. }
  83.  
  84.  
  85. /**
  86.  * drm_calc_timestamping_constants - Calculate and
  87.  * store various constants which are later needed by
  88.  * vblank and swap-completion timestamping, e.g, by
  89.  * drm_calc_vbltimestamp_from_scanoutpos().
  90.  * They are derived from crtc's true scanout timing,
  91.  * so they take things like panel scaling or other
  92.  * adjustments into account.
  93.  *
  94.  * @crtc drm_crtc whose timestamp constants should be updated.
  95.  *
  96.  */
  97. void drm_calc_timestamping_constants(struct drm_crtc *crtc)
  98. {
  99.         s64 linedur_ns = 0, pixeldur_ns = 0, framedur_ns = 0;
  100.         u64 dotclock;
  101.  
  102.         /* Dot clock in Hz: */
  103.         dotclock = (u64) crtc->hwmode.clock * 1000;
  104.  
  105.         /* Fields of interlaced scanout modes are only halve a frame duration.
  106.          * Double the dotclock to get halve the frame-/line-/pixelduration.
  107.          */
  108.         if (crtc->hwmode.flags & DRM_MODE_FLAG_INTERLACE)
  109.                 dotclock *= 2;
  110.  
  111.         /* Valid dotclock? */
  112.         if (dotclock > 0) {
  113.                 /* Convert scanline length in pixels and video dot clock to
  114.                  * line duration, frame duration and pixel duration in
  115.                  * nanoseconds:
  116.                  */
  117.                 pixeldur_ns = (s64) div64_u64(1000000000, dotclock);
  118.                 linedur_ns  = (s64) div64_u64(((u64) crtc->hwmode.crtc_htotal *
  119.                                               1000000000), dotclock);
  120.                 framedur_ns = (s64) crtc->hwmode.crtc_vtotal * linedur_ns;
  121.         } else
  122.                 DRM_ERROR("crtc %d: Can't calculate constants, dotclock = 0!\n",
  123.                           crtc->base.id);
  124.  
  125.         crtc->pixeldur_ns = pixeldur_ns;
  126.         crtc->linedur_ns  = linedur_ns;
  127.         crtc->framedur_ns = framedur_ns;
  128.  
  129.         DRM_DEBUG("crtc %d: hwmode: htotal %d, vtotal %d, vdisplay %d\n",
  130.                   crtc->base.id, crtc->hwmode.crtc_htotal,
  131.                   crtc->hwmode.crtc_vtotal, crtc->hwmode.crtc_vdisplay);
  132.         DRM_DEBUG("crtc %d: clock %d kHz framedur %d linedur %d, pixeldur %d\n",
  133.                   crtc->base.id, (int) dotclock/1000, (int) framedur_ns,
  134.                   (int) linedur_ns, (int) pixeldur_ns);
  135. }
  136.  
  137.