[alsa-devel] HDA HDMI audio doesn't work on Intel Geminilake machines

[Subhransu S. Prusty]

On Thu, Nov 02, 2017 at 12:40:46PM +0530, Hui Wang wrote:
> We have several Geminilake laptop and desktop machines, on these 
> machines, the HW configs are same and are as shown below:
> 
> the HDA controller: 00:0e.0 Audio device [0403]: Intel Corporation 
> Device [8086:3198] (rev 01)
> the HDMI codec: Vendor Id: 0x8086280d
> VGA controller: 00:02.0 VGA compatible controller [0300]: Intel 
> Corporation Device [8086:3184] (rev 01) (prog-if 00 [VGA controller])
> 
> The problem is if we boot the system without plugging the HDMI monitor, 
> the Linux kernel can't find HDMI codec at all. If we plug the HDMI 
> monitor before booting up, the kernel can find the HDMI codec, but there 
> are many errors (as shown below) and the HDMI audio can't play any sound.

Please create a bugzilla. Share the logs after applying the attached test
patch. Note to enable the debug logs.

> 
> Codec: Intel Geminilake HDMI
> Address: 2
> AFG Function Id: 0x1 (unsol 0)
> Vendor Id: 0x8086280d
> Subsystem Id: 0x80860101
> Revision Id: 0x100000
> No Modem Function Group found
> Default PCM:
> N/A
> Default Amp-In caps: N/A
> Default Amp-Out caps: N/A
> State of AFG node 0x01:
>    Power: setting=UNKNOWN, actual=UNKNOWN, Error, Clock-stop-OK, 
> Setting-reset
> Invalid AFG subtree
> --endcollapse--
> 
> [   25.504069] snd_hda_intel 0000:00:0e.0: azx_get_response timeout, 
> switching to polling mode: last cmd=0x20bf8100
> [   26.516125] snd_hda_intel 0000:00:0e.0: No response from codec, 
> disabling MSI: last cmd=0x20bf8100
> [   27.528058] snd_hda_intel 0000:00:0e.0: azx_get_response timeout, 
> switching to single_cmd mode: last cmd=0x20bf8100
> [   27.528259] azx_single_wait_for_response: 12 callbacks suppressed
> [   27.547927] snd_hda_codec_hdmi hdaudioC0D2: Unable to sync register 
> 0x2f0d00. -5
> 
> 
> We have tested the latest mainline kernel, but the testing result is the 
> same.
> 
> So does the existing kernel driver support the HDMI audio well for 
> Geminilake? If it does, what is wrong with those machines, HW issue or 

Hi,

Yes HDMI audio is tested on Geminilake. Can you please share information on
model you are testing? Also what is the BIOS version you are using?

> BIOS issue?

Yes this may be a BIOS issue as well.

Regards,
Subhransu

> 
> 
> Thanks in advance.
> 
> 
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> Alsa-devel at alsa-project.org
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