[Intel-gfx] [PATCH] drm/i915: decouple runtime PM enablement from DMC presence

[Jani Nikula]

On Thu, 15 Jun 2017, Imre Deak <imre.deak at intel.com> wrote:
> On Thu, Jun 15, 2017 at 10:20:57AM -0700, Rodrigo Vivi wrote:
>> I believe it is worth allowing RPM to work without requiring DMC, no?!
>
> Not if there is no good reason for not using DMC. It was decided early
> on that we won't support that configuration since if you care about the
> power saving provided by partially disabling things you probably also
> care about the bigger power saving provided by DMC. So that is the
> current state of the driver, enabling runtime PM without having DMC
> loaded is not supported. Proper support for that would need to be added
> after a justification why not to use the firmware.

Agreed. We already have too many configurations to support, and we
already struggle with our testing coverage as-is. Adding new
configurations to be tested is not to be taken lightly.

BR,
Jani.

-- 
Jani Nikula, Intel Open Source Technology Center