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

[Dmitry Osipenko]

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.

>> 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.

> I really don't understand why this is all taking so long, this thread
> just seems to be going round in interminable circles long after it
> looked like the issue was understood.  I have to admit I've not read
> every single message in the thread but it's difficult to see why it
> doesn't seem to be making any progress.

Ben was trying to make a fix for the introduced problem, but it's not
easy as we see now.

Perhaps the best solution should be to revert all of the three applied
patches and try again later on, once all current problems will be resolved.