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

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?