diff options
| author | Ville Syrjälä <ville.syrjala@linux.intel.com> | 2014-03-28 22:29:32 +0100 |
|---|---|---|
| committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2014-03-31 10:46:33 +0200 |
| commit | 1caea6e945e0867d391369097937620c945dcec1 (patch) | |
| tree | 571c190878b0e9f8fd0d787e7066a488409f9443 /drivers/gpu | |
| parent | drm/i915: Fix the interlace mode selection for gmch platforms (diff) | |
| download | linux-1caea6e945e0867d391369097937620c945dcec1.tar.xz linux-1caea6e945e0867d391369097937620c945dcec1.zip | |
drm/i915: Make sure vsyncshift is positive
If vsyncshift comes out as negative, add one htotal to it to get the
corresponding positive value.
This is rather theoretical as it would require a mode where the
hsync+back porch is very long and the active+front porch very short.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Diffstat (limited to 'drivers/gpu')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_display.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index a0f4ac187f1a..56018b79da62 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -5369,7 +5369,8 @@ static void intel_set_pipe_timings(struct intel_crtc *intel_crtc) enum transcoder cpu_transcoder = intel_crtc->config.cpu_transcoder; struct drm_display_mode *adjusted_mode = &intel_crtc->config.adjusted_mode; - uint32_t vsyncshift = 0, crtc_vtotal, crtc_vblank_end; + uint32_t crtc_vtotal, crtc_vblank_end; + int vsyncshift = 0; /* We need to be careful not to changed the adjusted mode, for otherwise * the hw state checker will get angry at the mismatch. */ @@ -5386,6 +5387,8 @@ static void intel_set_pipe_timings(struct intel_crtc *intel_crtc) else vsyncshift = adjusted_mode->crtc_hsync_start - adjusted_mode->crtc_htotal / 2; + if (vsyncshift < 0) + vsyncshift += adjusted_mode->crtc_htotal; } if (INTEL_INFO(dev)->gen > 3) |