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/radeon/radeon_display.c | |
| parent | eba1f35dfe145247c7eb690c7c32740fde8ec699 (diff) | |
| download | linux-3bb403bf421b5b00366a9041a7edc0a1f6494f5e.tar.bz2 | |
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/radeon/radeon_display.c')
| -rw-r--r-- | drivers/gpu/drm/radeon/radeon_display.c | 14 |
1 files changed, 8 insertions, 6 deletions
diff --git a/drivers/gpu/drm/radeon/radeon_display.c b/drivers/gpu/drm/radeon/radeon_display.c index d2e9e9efc159..0503af748d99 100644 --- a/drivers/gpu/drm/radeon/radeon_display.c +++ b/drivers/gpu/drm/radeon/radeon_display.c @@ -323,7 +323,8 @@ void radeon_crtc_handle_vblank(struct radeon_device *rdev, int crtc_id) */ if (update_pending && (DRM_SCANOUTPOS_VALID & radeon_get_crtc_scanoutpos(rdev->ddev, crtc_id, 0, - &vpos, &hpos, NULL, NULL)) && + &vpos, &hpos, NULL, NULL, + &rdev->mode_info.crtcs[crtc_id]->base.hwmode)) && ((vpos >= (99 * rdev->mode_info.crtcs[crtc_id]->base.hwmode.crtc_vdisplay)/100) || (vpos < 0 && !ASIC_IS_AVIVO(rdev)))) { /* crtc didn't flip in this target vblank interval, @@ -1799,7 +1800,8 @@ bool radeon_crtc_scaling_mode_fixup(struct drm_crtc *crtc, * */ 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) { u32 stat_crtc = 0, vbl = 0, position = 0; int vbl_start, vbl_end, vtotal, ret = 0; @@ -1914,7 +1916,7 @@ int radeon_get_crtc_scanoutpos(struct drm_device *dev, int crtc, unsigned int fl } else { /* No: Fake something reasonable which gives at least ok results. */ - vbl_start = rdev->mode_info.crtcs[crtc]->base.hwmode.crtc_vdisplay; + vbl_start = mode->crtc_vdisplay; vbl_end = 0; } @@ -1930,7 +1932,7 @@ int radeon_get_crtc_scanoutpos(struct drm_device *dev, int crtc, unsigned int fl /* Inside "upper part" of vblank area? Apply corrective offset if so: */ if (in_vbl && (*vpos >= vbl_start)) { - vtotal = rdev->mode_info.crtcs[crtc]->base.hwmode.crtc_vtotal; + vtotal = mode->crtc_vtotal; *vpos = *vpos - vtotal; } @@ -1952,8 +1954,8 @@ int radeon_get_crtc_scanoutpos(struct drm_device *dev, int crtc, unsigned int fl * We only do this if DRM_CALLED_FROM_VBLIRQ. */ if ((flags & DRM_CALLED_FROM_VBLIRQ) && !in_vbl) { - vbl_start = rdev->mode_info.crtcs[crtc]->base.hwmode.crtc_vdisplay; - vtotal = rdev->mode_info.crtcs[crtc]->base.hwmode.crtc_vtotal; + vbl_start = mode->crtc_vdisplay; + vtotal = mode->crtc_vtotal; if (vbl_start - *vpos < vtotal / 100) { *vpos -= vtotal; |