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/i915/i915_irq.c | |
parent | eba1f35dfe145247c7eb690c7c32740fde8ec699 (diff) | |
download | op-kernel-dev-3bb403bf421b5b00366a9041a7edc0a1f6494f5e.zip op-kernel-dev-3bb403bf421b5b00366a9041a7edc0a1f6494f5e.tar.gz |
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/i915/i915_irq.c')
-rw-r--r-- | drivers/gpu/drm/i915/i915_irq.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c index 4cbc722..ce1e0f5 100644 --- a/drivers/gpu/drm/i915/i915_irq.c +++ b/drivers/gpu/drm/i915/i915_irq.c @@ -648,12 +648,12 @@ static int __intel_get_crtc_scanline(struct intel_crtc *crtc) static int i915_get_crtc_scanoutpos(struct drm_device *dev, int pipe, unsigned int flags, int *vpos, int *hpos, - ktime_t *stime, ktime_t *etime) + ktime_t *stime, ktime_t *etime, + const struct drm_display_mode *mode) { struct drm_i915_private *dev_priv = dev->dev_private; struct drm_crtc *crtc = dev_priv->pipe_to_crtc_mapping[pipe]; struct intel_crtc *intel_crtc = to_intel_crtc(crtc); - const struct drm_display_mode *mode = &intel_crtc->base.hwmode; int position; int vbl_start, vbl_end, hsync_start, htotal, vtotal; bool in_vbl = true; |