linux-kernel - Re: [PATCH] ASoC: fsl_ssi: Fix clock control issue in master mode

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Message-ID: <CAOMZO5BF6M4McwGTuNU8jM41+N3jeaJp+U2ST5JY7e+yv8GO_A@mail.gmail.com>
Date:   Wed, 28 Aug 2019 13:02:32 -0300
From:   Fabio Estevam <festevam@...il.com>
To:     Shengjiu Wang <shengjiu.wang@....com>
Cc:     Timur Tabi <timur@...nel.org>,
        Nicolin Chen <nicoleotsuka@...il.com>,
        Xiubo Li <Xiubo.Lee@...il.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Linux-ALSA <alsa-devel@...a-project.org>,
        linuxppc-dev@...ts.ozlabs.org,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ASoC: fsl_ssi: Fix clock control issue in master mode

Hi Shengjiu,

On Wed, Aug 28, 2019 at 2:21 AM Shengjiu Wang <shengjiu.wang@....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@....com>

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