Re: [PATCH 2/3] drm/i915: Disable CPU underruns around eDP port and vdd enable on ILK-IVB

Chris Wilson
2015-11-21T10:52:27Z

On Fri, Nov 20, 2015 at 10:09:19PM +0200, ville.syrjala@linux.intel.com wrote:
> From: Ville Syrjälä <ville.syrjala@linux.intel.com>
>
> 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>
Acked-by: Chris Wilson <chris@chris-wilson.co.uk>

Same query as before as to whether we could add some DBG spew.
-Chris

--
Chris Wilson, Intel Open Source Technology Centre