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drm/i915: Fix scanoutpos calculations for interlaced modes 

The scanline counter counts lines in the current field, not the entire
frame. But the crtc_ timings are the values for the entire frame. Divide
the vertical timings by 2 to make them match the scanline counter.

The rounding was carefully chosen to make it do the right thing wrt. the
observed scanline counter and ISR vblank bit behaviour.

Reviewed-by: mario.kleiner.de@gmail.com
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
This commit is contained in:
Ville Syrjälä 2013-10-28 16:31:41 +02:00
parent 3c184f6991
commit d31faf65b8
1 changed files with 6 additions and 0 deletions
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6
drivers/gpu/drm/i915/i915_irq.c
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@ -698,6 +698,12 @@ static int i915_get_crtc_scanoutpos(struct drm_device *dev, int pipe,
vbl_start = mode->crtc_vblank_start;
vbl_end = mode->crtc_vblank_end;
if (mode->flags & DRM_MODE_FLAG_INTERLACE) {
vbl_start = DIV_ROUND_UP(vbl_start, 2);
vbl_end /= 2;
vtotal /= 2;
}
ret |= DRM_SCANOUTPOS_VALID | DRM_SCANOUTPOS_ACCURATE;
/*