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drm: Stop using linedur_ns and pixeldur_ns for vblank timestamps

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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>
This commit is contained in:
Ville Syrjälä
2015-09-14 22:43:44 +03:00
committed by Daniel Vetter
parent eba1f35dfe
commit 3bb403bf42
11 changed files with 43 additions and 34 deletions
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5
drivers/gpu/drm/radeon/radeon_mode.h
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@@ -876,8 +876,9 @@ extern void radeon_cursor_reset(struct drm_crtc *crtc);
extern int radeon_get_crtc_scanoutpos(struct drm_device *dev, int crtc,
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);
extern bool radeon_combios_check_hardcoded_edid(struct radeon_device *rdev);
extern struct edid *