diff options
| author | Ville Syrjälä <ville.syrjala@linux.intel.com> | 2015-09-14 22:43:44 +0300 |
|---|---|---|
| committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2015-09-24 20:14:21 +0200 |
| commit | 3bb403bf421b5b00366a9041a7edc0a1f6494f5e (patch) | |
| tree | d280555ef17c89c2a1e952d03749d230547598c3 /drivers/gpu/drm/nouveau/nouveau_display.h | |
| parent | eba1f35dfe145247c7eb690c7c32740fde8ec699 (diff) | |
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.h')
| -rw-r--r-- | drivers/gpu/drm/nouveau/nouveau_display.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/gpu/drm/nouveau/nouveau_display.h b/drivers/gpu/drm/nouveau/nouveau_display.h index a6213e2425c5..4182d21538c5 100644 --- a/drivers/gpu/drm/nouveau/nouveau_display.h +++ b/drivers/gpu/drm/nouveau/nouveau_display.h @@ -68,7 +68,8 @@ void nouveau_display_resume(struct drm_device *dev, bool runtime); int nouveau_display_vblank_enable(struct drm_device *, int); void nouveau_display_vblank_disable(struct drm_device *, int); int nouveau_display_scanoutpos(struct drm_device *, int, unsigned int, - int *, int *, ktime_t *, ktime_t *); + int *, int *, ktime_t *, ktime_t *, + const struct drm_display_mode *); int nouveau_display_vblstamp(struct drm_device *, int, int *, struct timeval *, unsigned); |