| 0,0 → 1,136 |
|---|
| /** |
| * \file drm_irq.c |
| * IRQ support |
| * |
| * \author Rickard E. (Rik) Faith <faith@valinux.com> |
| * \author Gareth Hughes <gareth@valinux.com> |
| */ |
| |
| /* |
| * Created: Fri Mar 19 14:30:16 1999 by faith@valinux.com |
| * |
| * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas. |
| * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. |
| * All Rights Reserved. |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a |
| * copy of this software and associated documentation files (the "Software"), |
| * to deal in the Software without restriction, including without limitation |
| * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| * and/or sell copies of the Software, and to permit persons to whom the |
| * Software is furnished to do so, subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice (including the next |
| * paragraph) shall be included in all copies or substantial portions of the |
| * Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR |
| * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, |
| * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR |
| * OTHER DEALINGS IN THE SOFTWARE. |
| */ |
| |
| #include "drmP.h" |
| #include <asm/div64.h> |
| //#include "drm_trace.h" |
| |
| //#include <linux/interrupt.h> /* For task queue support */ |
| #include <linux/slab.h> |
| |
| //#include <linux/vgaarb.h> |
| |
| /* Access macro for slots in vblank timestamp ringbuffer. */ |
| #define vblanktimestamp(dev, crtc, count) ( \ |
| (dev)->_vblank_time[(crtc) * DRM_VBLANKTIME_RBSIZE + \ |
| ((count) % DRM_VBLANKTIME_RBSIZE)]) |
| |
| /* Retry timestamp calculation up to 3 times to satisfy |
| * drm_timestamp_precision before giving up. |
| */ |
| #define DRM_TIMESTAMP_MAXRETRIES 3 |
| |
| /* Threshold in nanoseconds for detection of redundant |
| * vblank irq in drm_handle_vblank(). 1 msec should be ok. |
| */ |
| #define DRM_REDUNDANT_VBLIRQ_THRESH_NS 1000000 |
| |
| |
| static inline u64 div_u64(u64 dividend, u32 divisor) |
| { |
| u32 remainder; |
| return div_u64_rem(dividend, divisor, &remainder); |
| } |
| |
| |
| u64 div64_u64(u64 dividend, u64 divisor) |
| { |
| u32 high, d; |
| |
| high = divisor >> 32; |
| if (high) { |
| unsigned int shift = fls(high); |
| |
| d = divisor >> shift; |
| dividend >>= shift; |
| } else |
| d = divisor; |
| |
| return div_u64(dividend, d); |
| } |
| |
| |
| /** |
| * drm_calc_timestamping_constants - Calculate and |
| * store various constants which are later needed by |
| * vblank and swap-completion timestamping, e.g, by |
| * drm_calc_vbltimestamp_from_scanoutpos(). |
| * They are derived from crtc's true scanout timing, |
| * so they take things like panel scaling or other |
| * adjustments into account. |
| * |
| * @crtc drm_crtc whose timestamp constants should be updated. |
| * |
| */ |
| void drm_calc_timestamping_constants(struct drm_crtc *crtc) |
| { |
| s64 linedur_ns = 0, pixeldur_ns = 0, framedur_ns = 0; |
| u64 dotclock; |
| |
| /* Dot clock in Hz: */ |
| dotclock = (u64) crtc->hwmode.clock * 1000; |
| |
| /* Fields of interlaced scanout modes are only halve a frame duration. |
| * Double the dotclock to get halve the frame-/line-/pixelduration. |
| */ |
| if (crtc->hwmode.flags & DRM_MODE_FLAG_INTERLACE) |
| dotclock *= 2; |
| |
| /* Valid dotclock? */ |
| if (dotclock > 0) { |
| /* Convert scanline length in pixels and video dot clock to |
| * line duration, frame duration and pixel duration in |
| * nanoseconds: |
| */ |
| pixeldur_ns = (s64) div64_u64(1000000000, dotclock); |
| linedur_ns = (s64) div64_u64(((u64) crtc->hwmode.crtc_htotal * |
| 1000000000), dotclock); |
| framedur_ns = (s64) crtc->hwmode.crtc_vtotal * linedur_ns; |
| } else |
| DRM_ERROR("crtc %d: Can't calculate constants, dotclock = 0!\n", |
| crtc->base.id); |
| |
| crtc->pixeldur_ns = pixeldur_ns; |
| crtc->linedur_ns = linedur_ns; |
| crtc->framedur_ns = framedur_ns; |
| |
| DRM_DEBUG("crtc %d: hwmode: htotal %d, vtotal %d, vdisplay %d\n", |
| crtc->base.id, crtc->hwmode.crtc_htotal, |
| crtc->hwmode.crtc_vtotal, crtc->hwmode.crtc_vdisplay); |
| DRM_DEBUG("crtc %d: clock %d kHz framedur %d linedur %d, pixeldur %d\n", |
| crtc->base.id, (int) dotclock/1000, (int) framedur_ns, |
| (int) linedur_ns, (int) pixeldur_ns); |
| } |
| |