diff options
| author |   Mario Kleiner <mario.kleiner@tuebingen.mpg.de> | 2011-02-21 05:42:02 +0100 |
|---|---|---|
| committer |   Dave Airlie <airlied@redhat.com> | 2011-02-23 10:08:49 +1000 |
| commit | 9be6f8a978bdcbab46474a125aa4212516b71fe7 (patch) | |
| tree | 060d33b9eef457ad6f794804052a443c6f91347a /drivers/gpu/drm/drm_irq.c | |
| parent | drm/vblank: Use memory barriers optimized for atomic_t instead of generics. (diff) | |
| download | linux-dev-9be6f8a978bdcbab46474a125aa4212516b71fe7.tar.xz linux-dev-9be6f8a978bdcbab46474a125aa4212516b71fe7.zip | |
drm/vblank: Enable precise vblank timestamps for interlaced and doublescan modes.
Testing showed the current code can already handle doublescan
video modes just fine. A trivial tweak makes it work for interlaced
scanout as well.
Tested and shown to be precise on Radeon rv530, r600 and
Intel 945-GME.
Signed-off-by: Mario Kleiner <mario.kleiner@tuebingen.mpg.de>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Diffstat (limited to '')
| -rw-r--r-- | drivers/gpu/drm/drm_irq.c | 14 |
1 files changed, 6 insertions, 8 deletions
diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c index 22f3bf5ecbd2..53120a72a48c 100644 --- a/drivers/gpu/drm/drm_irq.c +++ b/drivers/gpu/drm/drm_irq.c @@ -493,6 +493,12 @@ void drm_calc_timestamping_constants(struct drm_crtc *crtc) /* Dot clock in Hz: */ dotclock = (u64) crtc->hwmode.clock * 1000; + /* Fields of interlaced scanout modes are only halve a frame duration. + * Double the dotclock to get halve the frame-/line-/pixelduration. + */ + if (crtc->hwmode.flags & DRM_MODE_FLAG_INTERLACE) + dotclock *= 2; + /* Valid dotclock? */ if (dotclock > 0) { /* Convert scanline length in pixels and video dot clock to @@ -605,14 +611,6 @@ int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev, int crtc, return -EAGAIN; } - /* Don't know yet how to handle interlaced or - * double scan modes. Just no-op for now. - */ - if (mode->flags & (DRM_MODE_FLAG_INTERLACE | DRM_MODE_FLAG_DBLSCAN)) { - DRM_DEBUG("crtc %d: Noop due to unsupported mode.\n", crtc); - return -ENOTSUPP; - } - /* Get current scanout position with system timestamp. * Repeat query up to DRM_TIMESTAMP_MAXRETRIES times * if single query takes longer than max_error nanoseconds. |