linux-kernel - Re: [PATCH] ASoC: fsl_esai: Add spin lock to protect reset and stop

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Date:   Fri, 25 Oct 2019 05:54:16 +0000
From:   "S.j. Wang" <shengjiu.wang@....com>
To:     Nicolin Chen <nicoleotsuka@...il.com>
CC:     "timur@...nel.org" <timur@...nel.org>,
        "Xiubo.Lee@...il.com" <Xiubo.Lee@...il.com>,
        "festevam@...il.com" <festevam@...il.com>,
        "broonie@...nel.org" <broonie@...nel.org>,
        "alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
        "lgirdwood@...il.com" <lgirdwood@...il.com>,
        "perex@...ex.cz" <perex@...ex.cz>,
        "tiwai@...e.com" <tiwai@...e.com>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ASoC: fsl_esai: Add spin lock to protect reset and stop


Hi
> 
> On Wed, Oct 23, 2019 at 03:29:49PM +0800, Shengjiu Wang wrote:
> > xrun may happen at the end of stream, the
> > trigger->fsl_esai_trigger_stop maybe called in the middle of
> > fsl_esai_hw_reset, this may cause esai in wrong state after stop, and
> > there may be endless xrun interrupt.
> 
> What about fsl_esai_trigger_start? It touches ESAI_xFCR_xFEN bit that is
> being checked in the beginning of fsl_esai_hw_reset.
> 
> Could the scenario below be possible also?
> 
> 1) ESAI TX starts
> 2) Xrun happens to TX
> 3) Starting fsl_esai_hw_reset (enabled[TX] = true; enabled[RX] = false)
> 4) ESAI RX starts
> 5) Finishing fsl_esai_hw_reset (enabled[RX] is still false)
> 
> 
Good catch, this may possible.  Will update in v2.

Best regards
Wang shengjiu