Re: [PATCH v4] ASoC: fsl_sai: Force a software reset when starting in consumer mode

[Fabio Estevam]

On Thu, Jun 26, 2025 at 10:09 AM Arun Raghavan <a...@arunraghavan.net> wrote:
>
> From: Arun Raghavan <a...@asymptotic.io>
>
> On an imx8mm platform with an external clock provider, when running the
> receiver (arecord) and triggering an xrun with xrun_injection, we see a
> channel swap/offset. This happens sometimes when running only the
> receiver, but occurs reliably if a transmitter (aplay) is also
> concurrently running.
>
> It seems that the SAI loses track of frame sync during the trigger stop
> -> trigger start cycle that occurs during an xrun. Doing just a FIFO
> reset in this case does not suffice, and only a software reset seems to
> get it back on track.
>
> This looks like the same h/w bug that is already handled for the
> producer case, so we now do the reset unconditionally on config disable.
>
> Signed-off-by: Arun Raghavan <a...@asymptotic.io>
> Reported-by: Pieterjan Camerlynck <p.camerly...@televic.com>
> Fixes: 3e3f8bd56955 ("ASoC: fsl_sai: fix no frame clk in master mode")
> Cc: sta...@vger.kernel.org

Reviewed-by: Fabio Estevam <feste...@gmail.com>