drm/i915: Fix scanoutpos calculations for interlaced modes

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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>

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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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drivers/gpu/drm/i915/i915_irq.c

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