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| /openbmc/linux/drivers/gpu/drm/i915/ |
| H A D | i915_irq.c | diff 54ddcbd26a677524d4bcd9f2a9539e6d743592d8 Mon Sep 23 05:02:07 CDT 2013 Ville Syrjälä <ville.syrjala@linux.intel.com> drm/i915: Improve the accuracy of get_scanout_pos on CTG+
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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