[alsa-devel] [PATCH] ALSA: hda_intel: add AZX_DCAPS_I915_POWERWELL for skl

[David Henningsson]

On 2015-03-30 04:47, Yang, Libin wrote:
>  From our silicon team's comment, it seems we need power on
> the powerwell when detecting and probing the HDMI codec.
>
> For the skl case (HDMI codec is in powerwell, while controller not),
> my thinking is:
>
> 1. power on the power well
> 2. read STATESTS to determine the codec_mask
> 3. if codec is not present, power off the power well
>      and remove the flag. (seems we need a new flag)
> 4. if codec is present, we will power on the power well
>      when dealing with HDMI codec.
>
> What do you think?

Side question - do you know if it's the same for braswell? I e, the HDMI 
codec is in the powerwell but the controller is not?

-- 
David Henningsson, Canonical Ltd.
https://launchpad.net/~diwic