linux-kernel - RE: [EXT] Re: [PATCH 3/3] ASoC: fsl_asrc: Fix error with S24

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Message-ID: <VE1PR04MB647982DF7060E527385CE50CE3B60@VE1PR04MB6479.eurprd04.prod.outlook.com>
Date:   Tue, 10 Sep 2019 02:24:43 +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>,
        "lgirdwood@...il.com" <lgirdwood@...il.com>,
        "broonie@...nel.org" <broonie@...nel.org>,
        "perex@...ex.cz" <perex@...ex.cz>,
        "tiwai@...e.com" <tiwai@...e.com>,
        "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: [EXT] Re: [PATCH 3/3] ASoC: fsl_asrc: Fix error with S24_3LE
 format bitstream in i.MX8


Hi

> 
> On Mon, Sep 09, 2019 at 06:33:21PM -0400, Shengjiu Wang wrote:
> > There is error "aplay: pcm_write:2023: write error: Input/output error"
> > on i.MX8QM/i.MX8QXP platform for S24_3LE format.
> >
> > In i.MX8QM/i.MX8QXP, the DMA is EDMA, which don't support 24bit
> > sample, but we didn't add any constraint, that cause issues.
> >
> > So we need to query the caps of dma, then update the hw parameters
> > according to the caps.
> 
> > @@ -285,8 +293,81 @@ static int fsl_asrc_dma_startup(struct
> > snd_pcm_substream *substream)
> >
> >       runtime->private_data = pair;
> >
> > -     snd_pcm_hw_constraint_integer(substream->runtime,
> > -                                   SNDRV_PCM_HW_PARAM_PERIODS);
> > +     ret = snd_pcm_hw_constraint_integer(substream->runtime,
> > +                                         SNDRV_PCM_HW_PARAM_PERIODS);
> > +     if (ret < 0) {
> > +             dev_err(dev, "failed to set pcm hw params periods\n");
> > +             return ret;
> > +     }
> > +
> > +     dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
> > +
> > +     /* Request a temp pair, which is release in the end */
> > +     fsl_asrc_request_pair(1, pair);
> 
> Not sure if it'd be practical, but a pair request could fail. Will probably need
> to check return value.
> 
> And a quick feeling is that below code is mostly identical to what is in the
> soc-generic-dmaengine-pcm.c file. So I'm wondering if we could abstract a
> helper function somewhere in the ASoC core: Mark?
> 
> Thanks
> Nicolin
> 
Yes, it refers to the code in soc-generic-dmaengine-pcm.c, if there is a common
API, this is helpful.

Best regards
Wang shengjiu