[alsa-devel] [Linux-kernel] [PATCH v5 2/7] ASoC: tegra: Allow 24bit and 32bit samples

[Jon Hunter]

On 28/01/2020 17:42, Dmitry Osipenko wrote:
> 28.01.2020 15:13, Mark Brown пишет:
>> On Mon, Jan 27, 2020 at 10:20:25PM +0300, Dmitry Osipenko wrote:
>>> 24.01.2020 19:50, Jon Hunter пишет:
>>
>>>>                 .rates = SNDRV_PCM_RATE_8000_96000,
>>>>                 .formats = SNDRV_PCM_FMTBIT_S32_LE |
>>>> -                          SNDRV_PCM_FMTBIT_S24_LE |
>>>> +                          SNDRV_PCM_FMTBIT_S24_3LE |
>>
>>> It should solve the problem in my particular case, but I'm not sure that
>>> the solution is correct.
>>
>> If the format implemented by the driver is S24_3LE the driver should
>> advertise S24_3LE.
> 
> It should be S24_LE, but seems we still don't know for sure.

Why?

>>> The v5.5 kernel is released now with the broken audio and apparently
>>> getting 24bit to work won't be trivial (if possible at all). Ben, could
>>> you please send a patch to fix v5.5 by removing the S24 support
>>> advertisement from the driver?
>>
>> Why is that the best fix rather than just advertising the format
>> implemented by the driver?
> 
> The currently supported format that is known to work well is S16_LE.
> 
> I'm suggesting to drop the S24_LE and S32_LE that were added by the
> applied patches simply because this series wasn't tested properly before
> it was sent out and turned out that it doesn't work well.

S32_LE should be fine, however, I do have some concerns about S24_LE.

Jon

-- 
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