[Intel-gfx] [PATCH v3] drm/i915: Beef up the IPS vs. CRC workaround

[Ville Syrjälä]

On Thu, Aug 17, 2017 at 05:55:09PM +0300, ville.syrjala at linux.intel.com wrote:
> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
> 
> Oneshot disabling of IPS when CRC capturing is started is insufficient.
> IPS may get re-enabled by any plane update, and hence tests that keep
> CRC capturing on across plane updates will start to see inconsistent
> results as soon as IPS kicks back in. Add a new knob into the crtc state
> to make sure IPS stays disabled as long as CRC capturing is enabled.
> 
> Forcing a modeset is the easiest way to handle this since that's already
> how we do the panel fitter workaround. It's a little heavy handed just
> for IPS, but seeing as we might already do the panel fitter workaround
> I think it's better to follow that. We migth want to optimize both cases
> later if someone gets too upset by the extra delay from the modeset.
> 
> v2: Check the right thing when deciding whether to force a modeset
> v3: Rebase, check HAS_IPS before forcing a modeset,
>     move ips_force_disable check into pipe_config_supports_ips()
> 
> Cc: Paulo Zanoni <paulo.r.zanoni at intel.com>
> Cc: Daniel Vetter <daniel.vetter at ffwll.ch>
> Cc: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
> Cc: Marta Lofstedt <marta.lofstedt at intel.com>
> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=101664
> Reviewed-by: Paulo Zanoni <paulo.r.zanoni at intel.com>
> Tested-by: Marta Lofsted <marta.lofstedt at intel.com> #v2
> Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>

Pushed to dinq. Thanks for the review and testing.

-- 
Ville Syrjälä
Intel OTC