[Intel-gfx] [PATCH 1/2] drm/i915: Get power refs in encoder->get_power_domain()

[Chris Wilson]

Quoting Imre Deak (2019-04-05 16:36:56)
> Push getting the reference for the encoders' power domains into the
> encoder get_power_domain() hook instead of doing this from the caller.
> This way the encoder can store away the corresponding wakerefs.
> 
> This fixes the DSI encoder disabling, which didn't release these
> power references it acquired during HW state readout.

The io_wakeref is for the paired io_enable/io_disable.

get_encoder_power_domains() is the owner of these wakerefs, and they
then belong to the atomic state from preparation through use to final
release.
-Chris