linux-kernel - Re: [PATCH] ASoC: fsl_esai: fix the channel swap issue after xrun

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Date:   Thu, 23 May 2019 09:53:42 +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>,
        "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: fix the channel swap issue after xrun

Hi

> > +     /*
> > +      * Add fifo reset here, because the regcache_sync will
> > +      * write one more data to ETDR.
> > +      * Which will cause channel shift.
> 
> Sounds like a bug to me...should fix it first by marking the data registers as
> volatile.
> 

The ETDR is a writable register, it is not volatile. Even we change it to
Volatile, I don't think we can't avoid this issue. for the regcache_sync
Just to write this register, it is correct behavior.

Best regards
Wang shengjiu