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From:   John Stultz <john.stultz@linaro.org>
Date:   Wed, 8 Jan 2020 20:58:15 -0800
Message-ID: <CANcMJZBy=yH+4YgZWwphiE-PO6d4hzhFK3XFtpN677ZAv_N4WQ@mail.gmail.com>
Subject: Re: [PATCH V6 3/4] ASoC: pcm_dmaengine: Extract snd_dmaengine_pcm_refine_runtime_hwparams
To:     Shengjiu Wang <shengjiu.wang@nxp.com>
Cc:     timur@kernel.org, nicoleotsuka@gmail.com, Xiubo.Lee@gmail.com,
        festevam@gmail.com, lgirdwood@gmail.com, broonie@kernel.org,
        perex@perex.cz, tiwai@suse.com, alsa-devel@alsa-project.org,
        linuxppc-dev@lists.ozlabs.org,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Rob Herring <robh+dt@kernel.org>,
        Mark Rutland <mark.rutland@arm.com>,
        devicetree@vger.kernel.org, lars@metafoo.de
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On Thu, Sep 26, 2019 at 6:50 PM Shengjiu Wang <shengjiu.wang@nxp.com> wrote:
>
> When set the runtime hardware parameters, we may need to query
> the capability of DMA to complete the parameters.
>
> This patch is to Extract this operation from
> dmaengine_pcm_set_runtime_hwparams function to a separate function
> snd_dmaengine_pcm_refine_runtime_hwparams, that other components
> which need this feature can call this function.
>
> Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
> Reviewed-by: Nicolin Chen <nicoleotsuka@gmail.com>

As a heads up, this patch seems to be causing a regression on the HiKey board.

On boot up I'm seeing:
[   17.721424] hi6210_i2s f7118000.i2s: ASoC: can't open component
f7118000.i2s: -6

And HDMI audio isn't working. With this patch reverted, audio works again.


> diff --git a/sound/core/pcm_dmaengine.c b/sound/core/pcm_dmaengine.c
> index 89a05926ac73..5749a8a49784 100644
> --- a/sound/core/pcm_dmaengine.c
> +++ b/sound/core/pcm_dmaengine.c
> @@ -369,4 +369,87 @@ int snd_dmaengine_pcm_close_release_chan(struct snd_pcm_substream *substream)
...
> +       ret = dma_get_slave_caps(chan, &dma_caps);
> +       if (ret == 0) {
> +               if (dma_caps.cmd_pause && dma_caps.cmd_resume)
> +                       hw->info |= SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME;
> +               if (dma_caps.residue_granularity <= DMA_RESIDUE_GRANULARITY_SEGMENT)
> +                       hw->info |= SNDRV_PCM_INFO_BATCH;
> +
> +               if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
> +                       addr_widths = dma_caps.dst_addr_widths;
> +               else
> +                       addr_widths = dma_caps.src_addr_widths;
> +       }

It seems a failing ret from dma_get_slave_caps() here is being returned...

> +
> +       /*
> +        * If SND_DMAENGINE_PCM_DAI_FLAG_PACK is set keep
> +        * hw.formats set to 0, meaning no restrictions are in place.
> +        * In this case it's the responsibility of the DAI driver to
> +        * provide the supported format information.
> +        */
> +       if (!(dma_data->flags & SND_DMAENGINE_PCM_DAI_FLAG_PACK))
> +               /*
> +                * Prepare formats mask for valid/allowed sample types. If the
> +                * dma does not have support for the given physical word size,
> +                * it needs to be masked out so user space can not use the
> +                * format which produces corrupted audio.
> +                * In case the dma driver does not implement the slave_caps the
> +                * default assumption is that it supports 1, 2 and 4 bytes
> +                * widths.
> +                */
> +               for (i = SNDRV_PCM_FORMAT_FIRST; i <= SNDRV_PCM_FORMAT_LAST; i++) {
> +                       int bits = snd_pcm_format_physical_width(i);
> +
> +                       /*
> +                        * Enable only samples with DMA supported physical
> +                        * widths
> +                        */
> +                       switch (bits) {
> +                       case 8:
> +                       case 16:
> +                       case 24:
> +                       case 32:
> +                       case 64:
> +                               if (addr_widths & (1 << (bits / 8)))
> +                                       hw->formats |= pcm_format_to_bits(i);
> +                               break;
> +                       default:
> +                               /* Unsupported types */
> +                               break;
> +                       }
> +               }
> +
> +       return ret;

... down here.

Where as in the old code...

> diff --git a/sound/soc/soc-generic-dmaengine-pcm.c b/sound/soc/soc-generic-dmaengine-pcm.c
> index 748f5f641002..b9f147eaf7c4 100644
> --- a/sound/soc/soc-generic-dmaengine-pcm.c
> +++ b/sound/soc/soc-generic-dmaengine-pcm.c

> @@ -145,56 +140,12 @@ static int dmaengine_pcm_set_runtime_hwparams(struct snd_pcm_substream *substrea
>         if (pcm->flags & SND_DMAENGINE_PCM_FLAG_NO_RESIDUE)
>                 hw.info |= SNDRV_PCM_INFO_BATCH;
>
> -       ret = dma_get_slave_caps(chan, &dma_caps);
> -       if (ret == 0) {
> -               if (dma_caps.cmd_pause && dma_caps.cmd_resume)
> -                       hw.info |= SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME;
> -               if (dma_caps.residue_granularity <= DMA_RESIDUE_GRANULARITY_SEGMENT)
> -                       hw.info |= SNDRV_PCM_INFO_BATCH;
> -
> -               if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
> -                       addr_widths = dma_caps.dst_addr_widths;
> -               else
> -                       addr_widths = dma_caps.src_addr_widths;
> -       }

...the ret from dma_get_slave_caps()  checked above, but is not
actually returned.

Suggestions on how to sort this out?

thanks
-john