[alsa-devel] [PATCH] ASoC: fsl_ssi: Fix clock control issue in master mode

[Fabio Estevam]

Hi Shengjiu,

On Wed, Aug 28, 2019 at 2:21 AM Shengjiu Wang <shengjiu.wang at nxp.com> wrote:
>
> The test case is
> arecord -Dhw:0 -d 10 -f S16_LE -r 48000 -c 2 temp.wav &
> aplay -Dhw:0 -d 30 -f S16_LE -r 48000 -c 2 test.wav
>
> There will be error after end of arecord:
> aplay: pcm_write:2051: write error: Input/output error
>
> Capture and Playback work in parallel in master mode, one
> substream stops, the other substream is impacted, the
> reason is that clock is disabled wrongly.
>
> The clock's reference count is not increased when second
> substream starts, the hw_param() function returns in the
> beginning because first substream is enabled, then in end
> of first substream, the hw_free() disables the clock.
>
> This patch is to move the clock enablement to the place
> before checking of the device enablement in hw_param().
>
> Signed-off-by: Shengjiu Wang <shengjiu.wang at nxp.com>

It would be nice if you could add a Fixes tag as well.