drm/i915: Improve the accuracy of get_scanout_pos on CTG+

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The DSL register increments at the start of horizontal sync, so it
manages to miss the entire active portion of the current line.

Improve the get_scanoutpos accuracy a bit when the scanout position is
close to the start or end of vblank. We can do that by double checking
the DSL value against the vblank status bit from ISR.

Cc: Mario Kleiner <mario.kleiner@tuebingen.mpg.de>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: mario.kleiner.de@gmail.com
Tested-by: mario.kleiner.de@gmail.com
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

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Ville Syrjälä 2013-09-23 13:02:07 +03:00 • committed by Daniel Vetter

parent 3aa18df8f2

commit 54ddcbd26a

1 changed files with 53 additions and 0 deletions

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drivers/gpu/drm/i915/i915_irq.c

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