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drm/i915: Disable CPU underruns around eDP port and vdd enable on ILK-IVB
authorVille Syrjälä <ville.syrjala@linux.intel.com>
Fri, 20 Nov 2015 20:09:19 +0000 (22:09 +0200)
committerVille Syrjälä <ville.syrjala@linux.intel.com>
Tue, 24 Nov 2015 14:13:46 +0000 (16:13 +0200)
commit7864578a70ac8af640b02d2caf3555aba9048f6f
treed86eaf2cd1c3ed4fbb90d7209c2c4b78cef7e530
parent3860b2ecfc96251455091739b92217e4f01b96c2
drm/i915: Disable CPU underruns around eDP port and vdd enable on ILK-IVB

We sometimes get a spurious CPU pipe underrun somewhere between
enabling port A and enabling vdd for the panel. Observed on both
ILK and IVB with port A eDP. Suppress FIFO underrun reporting
around the port and vdd enable to avoid the dmesg errors.

Not sure if port D eDP would suffer from the same issue, but assume
that it doesn't until proven differently.

Testcase: igt/kms_setmode
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1448050160-14124-2-git-send-email-ville.syrjala@linux.intel.com
Acked-by: Chris Wilson <chris@chris-wilson.co.uk>
drivers/gpu/drm/i915/intel_dp.c