AMD Carrizo HDMI audio

[João Paulo Rechi Vita]

On 9 June 2016 at 15:26, Deucher, Alexander <Alexander.Deucher at amd.com> wrote:
>> -----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
>

Thanks for such a quick answer! So that means no audio over HDMI/DP
without DAL, right? Isn't any legacy code that can take care of that?
I'll give it a try on your branch and report back if I have any
problems.

Best regards,

--
João Paulo Rechi Vita
http://about.me/jprvita