drm/i915: Try to fix the messy IVB sprite scaling workaround

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We now have a very clear method of disabling LP1+ wartermarks,
and we can actually detect if we actually did disable them, or
if they were already disabled. Use that to clean up the
WaCxSRDisabledForSpriteScaling:ivb handling.

I was hoping to apply the workaround in a way that wouldn't
require a blocking wait, but sadly IVB really does appear to
require LP1+ watermarks to be off for an entire frame before
enabling sprite scaling. Simply disabling LP1+ watermarks
during the previous frame is not enough, no matter how early
in the frame we do it :(

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

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Ville Syrjälä 2013-12-05 15:51:39 +02:00 • committed by Daniel Vetter

parent 96f90c5421

commit 8553c18ea6

3 changed files with 46 additions and 40 deletions

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1

drivers/gpu/drm/i915/i915_drv.h

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68

drivers/gpu/drm/i915/intel_pm.c

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27

drivers/gpu/drm/i915/intel_sprite.c

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