linux-kernel - Re: [PATCH] ASoC: simple-card: Fill in driver name

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Date:   Tue, 12 Oct 2021 09:09:29 +0200
From:   Jaroslav Kysela <perex@...ex.cz>
To:     didi.debian@...ow.org
Cc:     alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
        Guido Günther <agx@...xcpu.org>
Subject: Re: [PATCH] ASoC: simple-card: Fill in driver name

On 11. 10. 21 23:48, didi.debian@...ow.org wrote:
> On 2021-10-11 19:16, Jaroslav Kysela wrote:
>> On 10. 10. 21 12:40, Diederik de Haas wrote:
>>> On Sunday, 10 October 2021 10:40:09 CEST Jaroslav Kysela wrote:
>>>>> Unfortunately this change broke multichannel audio on my Rock64
>>>>> device
>>>>> running Debian. My Rock64 is connected to my AVR (Pioneer SC-1224)
>>>>> via a
>>>>> HDMI cable.
>>>> This looks like an user space configuration problem.
>>>
>>> I have placed ALSA card definitions (I think) from LibreELEC on my
>>> system from
>>> https://github.com/LibreELEC/LibreELEC.tv/tree/master/projects/Rockchip/
>>> filesystem/usr/share/alsa/cards
>>
>> Apparently, the alsa-lib configuration is used in this case.
>>
>> It seems that there are four sound cards (Analog/HDMI/I2S/SPDIF)
>> created for your hardware. The alsa-lib configuration is a bit weird -
>> an obfuscation for the simple-card driver use. The simple way to
>> resolve this is to create a proper UCM configuration.
>>
>> If you need further assistance, create an issue for alsa-lib or
>> alsa-ucm-conf on github and with an output from the 'alsa-info.sh'
>> script.
> 
> Will do.
> 
> FTR: It's now working again for me on a kernel with this patch included:
> https://github.com/LibreELEC/LibreELEC.tv/issues/5734#issuecomment-940088156
> 
> I have no idea whether this is a proper solution or another
> 'workaround', but
> it's working for me again :)

The patch bellow resolved your issue - alsa-lib configuration fix. But it's 
not an universal solution and there may be clashes with other simple-card 
drivers in future.

https://github.com/LibreELEC/LibreELEC.tv/pull/5749/commits/f681a48a664bd0f0e8f0dc131bd58c5d7512adc3

						Jaroslav

-- 
Jaroslav Kysela <perex@...ex.cz>
Linux Sound Maintainer; ALSA Project; Red Hat, Inc.