[alsa-devel] AMD Carrizo HDMI audio

[Deucher, Alexander]

> -----Original Message-----
> From: João Paulo Rechi Vita [mailto:jprvita at gmail.com]
> Sent: Thursday, June 09, 2016 3:14 PM
> To: Alex Deucher; maruthi.srinivas.b at gmail.com
> Cc: dri-devel at lists.freedesktop.org; alsa-devel at alsa-project.org; Deucher,
> Alexander; Bayyavarapu, Maruthi; João Paulo Rechi Vita;
> linux at endlessm.com
> Subject: AMD Carrizo HDMI audio
> 
> Hello Alex and Maruthi,
> 
> I'm trying to get HDMI audio working on a AMD CARRIZO laptop, which I
> believe need the ACP changes which got merged into Linux 4.6. But
> testing the v4.6 tag, amd_acp_hw_init() returns -ENODEV, because it
> succeeds the "if (acp_mode != ACP_MODE_I2S)" test in acp_hw.c. Does
> this mean this chip does not uses ACP, or is there anything else
> missing?

Your system does not use ACP.  It uses HDA audio.  You'll need to use the new DAL display code which is not yet upstream for HDMI or DP audio support.  You can find dal support on my freedesktop tree.  E.g.,
https://cgit.freedesktop.org/~agd5f/linux/log/?h=drm-next-4.7-wip-dal

Alex