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Similar to
commit 37ca8d4ccd9860df0747aa2ea281a3c9c4bf8826
Author: Ville Syrjälä <ville.syrjala@linux.intel.com>
Date: Fri Oct 30 19:20:27 2015 +0200
drm/i915: Enable PCH FIFO underruns later on ILK/SNB/IVB
we can only enable fifo underrun reporting when using the fdi/lpt
after everything is set up and after a bit of waiting. The waiting
is required, enabling it right after enabling encoders will first trigger
an underrun on the pch and then, 1 frame later, an underrun on the
cpu. Two vblank waits after encoder enabling seems enough to curb it.
And similar to
Author: Ville Syrjälä <ville.syrjala@linux.intel.com>
Date: Fri Nov 20 22:09:18 2015 +0200
drm/i915: Suppress spurious CPU FIFO underruns on ILK-IVB
we also need to make sure cpu fifo underrun reporting is disabled when
enabling the fdi rx/tx and pch transcoder&port. But somehow this is
only needed when enabling, not also when disabling.
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1448705139-12534-1-git-send-email-daniel.vetter@ffwll.ch
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=91578
Tested-by: Mika Kahola <mika.kahola@intel.com>
Reviewed-by: Mika Kahola <mika.kahola@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
6b69851690