[Intel-gfx] [PATCH] drm/i915: Don't sanitize frame start delay if the pipe is off

[Chris Wilson]

Quoting Ville Syrjala (2017-11-15 20:04:42)
> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
> 
> Avoid touching PIPECONF in intel_sanitize_crtc() unless the pipe is
> actually on. Should cure some unclaimed register accesses.
+ during reset, as we are rather cavalier in our approach to powerdomain
management.

> We don't have to sanitize this if the pipe is off since we will
> overwrite the frame start delay anyway when turning the pipe on.
> 
> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=102249
> Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
Reviewed-by: Chris Wilson <chris at chris-wilson.co.uk>

Let's not even get started on the handling of modesets vs display reset.
-Chris