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authorVille Syrjälä <ville.syrjala@linux.intel.com>2015-09-14 22:43:44 +0300
committerDaniel Vetter <daniel.vetter@ffwll.ch>2015-09-24 21:14:21 +0300
commit3bb403bf421b5b00366a9041a7edc0a1f6494f5e (patch)
treed280555ef17c89c2a1e952d03749d230547598c3 /drivers/gpu/drm/nouveau/nouveau_display.c
parenteba1f35dfe145247c7eb690c7c32740fde8ec699 (diff)
downloadlinux-3bb403bf421b5b00366a9041a7edc0a1f6494f5e.tar.xz
drm: Stop using linedur_ns and pixeldur_ns for vblank timestamps
linedur_ns, and especially pixeldur_ns are becoming rather inaccurate to be used for the vblank timestamp correction. With 4k@60 the pixel duration is already below 2ns, so the amount of error due to the truncation to nanoseconds is introducing quite a bit of error. We can avoid such problems if we instead calculate the timestamp delta_ns directly from the dislay timings, avoiding the use of these intermediate truncated values. Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> [danvet: Squash in fixup from Thierry Reding for amdgpu.] Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Diffstat (limited to 'drivers/gpu/drm/nouveau/nouveau_display.c')
-rw-r--r--drivers/gpu/drm/nouveau/nouveau_display.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/gpu/drm/nouveau/nouveau_display.c b/drivers/gpu/drm/nouveau/nouveau_display.c
index 425515feef6e..a82c3cbe3127 100644
--- a/drivers/gpu/drm/nouveau/nouveau_display.c
+++ b/drivers/gpu/drm/nouveau/nouveau_display.c
@@ -133,7 +133,8 @@ nouveau_display_scanoutpos_head(struct drm_crtc *crtc, int *vpos, int *hpos,
int
nouveau_display_scanoutpos(struct drm_device *dev, int head, unsigned int flags,
- int *vpos, int *hpos, ktime_t *stime, ktime_t *etime)
+ int *vpos, int *hpos, ktime_t *stime, ktime_t *etime,
+ const struct drm_display_mode *mode)
{
struct drm_crtc *crtc;