drm/i915: Check for underruns after crtc disable
To get a better idea if underruns occurred during crtc disabling, let's check for them explicitly. This helps in cases where the error interrupt isn't active, or there is no underrun interrupt support at all. Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/1448050160-14124-3-git-send-email-ville.syrjala@linux.intel.comReviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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