[Intel-gfx] [PATCH v2 4/4] drm/i915/gen9: Fix runtime PM refcounting in case DMC firmware isn't loaded

[Chris Wilson]

On Mon, Apr 18, 2016 at 02:48:21PM +0300, Imre Deak wrote:
> While we disable runtime PM and with that display power well support if
> the DMC firmware isn't loaded, we still want to disable power wells
> during system suspend and driver unload. So drop/reacquire the
> corresponding power refcount during suspend/resume and driver unloading.
> This also means we have to check if DMC is not loaded and skip enabling
> DC states in the power well code.
> 
> v2:
> - Reuse intel_csr_ucode_suspend() in intel_csr_ucode_fini() instead of
>   opencoding the former. (Chris)
> - Add docbook comment to the public resume and suspend functions.
> 
> CC: Chris Wilson <chris at chris-wilson.co.uk>
> Signed-off-by: Imre Deak <imre.deak at intel.com>

Makes sense to me (I'm will say I am not that familiar with CSR though)
Reviewed-by: Chris Wilson <chris at chris-wilson.co.uk>
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre