[PATCH v2 2/2] drm/i915: Check for unreliable MMIO during forcewake

[Andi Shyti]

> Although we now sanitycheck MMIO access during driver load to make sure
> the MMIO BAR isn't returning all 0xFFFFFFFF, there have been a few cases
> where (temporarily?) unreliable MMIO access has happened after GPU
> resets or power events.  We'll often notice this on our next GT register
> access since forcewake handling will fail; let's change our handling
> slightly so that when this happens we print a more meaningful message
> clarifying that the problem is the MMIO access, not forcewake
> specifically.
> 
> Signed-off-by: Matt Roper <matthew.d.roper at intel.com>
> Cc: Mika Kuoppala <mika.kuoppala at linux.intel.com>
> Signed-off-by: Andi Shyti <andi.shyti at linux.intel.com>

Reviewed-by: Andi Shyti <andi.shyti at linux.intel.com>

Andi