Rev 3031 | Go to most recent revision | Details | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 1963 | serge | 1 | /** |
| 2 | * \file drm_irq.c |
||
| 3 | * IRQ support |
||
| 4 | * |
||
| 5 | * \author Rickard E. (Rik) Faith |
||
| 6 | * \author Gareth Hughes |
||
| 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 |
||
| 38 | //#include "drm_trace.h" |
||
| 39 | |||
| 40 | //#include |
||
| 41 | #include |
||
| 42 | |||
| 43 | //#include |
||
| 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 |