[Intel-gfx] [PATCH v2] drm/i915: Limit audio CDCLK>=2*BCLK constraint back to GLK only

[Kai Vehmanen]

Hey,

On Wed, 11 Mar 2020, Takashi Iwai wrote:

> The remaining question is whether this display_power() call is still
> needed for the recent chips.  Basically it's there for HSW/BDW type
> chips that need already the power for the HDA link that is dedicated
> to HDMI.  That is, a patch like below could work for the recent chips

yes, it is still needed. The newer chips (GLK, ICL and newer) have added 
sw logic in i915 get_power() that must be run before audio controller is 
initialized. So calling display_power() here is actually more critical 
than before, power up from codec driver is too late. If it's not done, 
you'll get verbs timing out (unless power management is disabled on i915 
side).

Br, Kai