Quoting Michal Wajdeczko (2018-05-28 18:16:18)
> SOFT_SCRATCH(15) is used by GuC for sending MMIO GuC events to host and
> those events are now handled by intel_guc_to_host_event_handler_mmio().
> 
> We should not try to read it on MMIO action error as 1) we may be using
> different set of registers for GuC MMIO communication, and 2) GuC may
> use CTB mechanism for sending events to host.
> 
> While here, upgrade error message to DRM_ERROR.
> 
> Signed-off-by: Michal Wajdeczko <[email protected]>
> Cc: Michel Thierry <[email protected]>
> Cc: Joonas Lahtinen <[email protected]>
> Cc: Chris Wilson <[email protected]>

I'm still not totally sold on having the DRM_ERROR here improves
debugging; it doesn't do anything to improve error handling, but

Reviewed-by: Chris Wilson <[email protected]>

nevertheless.
-Chris
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