[V6,3/4] ASoC: pcm_dmaengine: Extract snd_dmaengine_pcm_refine_runtime_hwparams

Commit Message

Shengjiu Wang Sept. 27, 2019, 1:46 a.m. UTC

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 <[e-mail]>
Reviewed-by: Nicolin Chen <[e-mail]>
---
 include/sound/dmaengine_pcm.h         |  5 ++
 sound/core/pcm_dmaengine.c            | 83 +++++++++++++++++++++++++++
 sound/soc/soc-generic-dmaengine-pcm.c | 61 ++------------------
 3 files changed, 94 insertions(+), 55 deletions(-)

Comments

John Stultz Jan. 9, 2020, 4:58 a.m. UTC | #1

On Thu, Sep 26, 2019 at 6:50 PM Shengjiu Wang <[e-mail]> 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 <[e-mail]>
> Reviewed-by: Nicolin Chen <[e-mail]>

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

John Stultz Jan. 16, 2020, 5:54 a.m. UTC | #2

On Wed, Jan 8, 2020 at 8:58 PM John Stultz <[e-mail]> wrote:
> On Thu, Sep 26, 2019 at 6:50 PM Shengjiu Wang <[e-mail]> 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 <[e-mail]>
> > Reviewed-by: Nicolin Chen <[e-mail]>
>
> 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?

Just wanted to check in on this, as I'm still seeing this regression with -rc6.

thanks
-john

Shengjiu Wang Jan. 17, 2020, 7:11 a.m. UTC | #3

Hi

On Thu, Jan 16, 2020 at 1:56 PM John Stultz <[e-mail]> wrote:
>
> On Wed, Jan 8, 2020 at 8:58 PM John Stultz <[e-mail]> wrote:
> > On Thu, Sep 26, 2019 at 6:50 PM Shengjiu Wang <[e-mail]> 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 <[e-mail]>
> > > Reviewed-by: Nicolin Chen <[e-mail]>
> >
> > 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?
>
> Just wanted to check in on this, as I'm still seeing this regression with -rc6.
>
Compare with the old code. it seems that we shouldn't check the return value.

Could you help to test below changes?

--- a/sound/soc/soc-generic-dmaengine-pcm.c
+++ b/sound/soc/soc-generic-dmaengine-pcm.c
@@ -138,12 +138,10 @@ dmaengine_pcm_set_runtime_hwparams(struct
snd_soc_component *component,
        if (pcm->flags & SND_DMAENGINE_PCM_FLAG_NO_RESIDUE)
                hw.info |= SNDRV_PCM_INFO_BATCH;

-       ret = snd_dmaengine_pcm_refine_runtime_hwparams(substream,
+       snd_dmaengine_pcm_refine_runtime_hwparams(substream,
                                                        dma_data,
                                                        &hw,
                                                        chan);
-       if (ret)
-               return ret;

        return snd_soc_set_runtime_hwparams(substream, &hw);
 }

Best regards
Shengjiu Wang

John Stultz Jan. 18, 2020, 4:02 a.m. UTC | #4

On Thu, Jan 16, 2020 at 11:11 PM Shengjiu Wang <[e-mail]> wrote:
>
> Hi
>
> On Thu, Jan 16, 2020 at 1:56 PM John Stultz <[e-mail]> wrote:
> >
> > On Wed, Jan 8, 2020 at 8:58 PM John Stultz <[e-mail]> wrote:
> > > On Thu, Sep 26, 2019 at 6:50 PM Shengjiu Wang <[e-mail]> 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 <[e-mail]>
> > > > Reviewed-by: Nicolin Chen <[e-mail]>
> > >
> > > 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?
> >
> > Just wanted to check in on this, as I'm still seeing this regression with -rc6.
> >
> Compare with the old code. it seems that we shouldn't check the return value.
>
> Could you help to test below changes?
>
> --- a/sound/soc/soc-generic-dmaengine-pcm.c
> +++ b/sound/soc/soc-generic-dmaengine-pcm.c
> @@ -138,12 +138,10 @@ dmaengine_pcm_set_runtime_hwparams(struct
> snd_soc_component *component,
>         if (pcm->flags & SND_DMAENGINE_PCM_FLAG_NO_RESIDUE)
>                 hw.info |= SNDRV_PCM_INFO_BATCH;
>
> -       ret = snd_dmaengine_pcm_refine_runtime_hwparams(substream,
> +       snd_dmaengine_pcm_refine_runtime_hwparams(substream,
>                                                         dma_data,
>                                                         &hw,
>                                                         chan);
> -       if (ret)
> -               return ret;
>
>         return snd_soc_set_runtime_hwparams(substream, &hw);
>  }

Yes, thanks for taking a look at this! Your patch does appear to avoid
the regression.
(Though you'll want to drop the ret declaration to avoid "warning:
unused variable 'ret'" compiler warnings.)

thanks
-john

Patch

diff --git a/include/sound/dmaengine_pcm.h b/include/sound/dmaengine_pcm.h
index c679f6116580..b65220685920 100644
--- a/include/sound/dmaengine_pcm.h
+++ b/include/sound/dmaengine_pcm.h
@@ -83,6 +83,11 @@  void snd_dmaengine_pcm_set_config_from_dai_data(
 	const struct snd_dmaengine_dai_dma_data *dma_data,
 	struct dma_slave_config *config);
 
+int snd_dmaengine_pcm_refine_runtime_hwparams(
+	struct snd_pcm_substream *substream,
+	struct snd_dmaengine_dai_dma_data *dma_data,
+	struct snd_pcm_hardware *hw,
+	struct dma_chan *chan);
 
 /*
  * Try to request the DMA channel using compat_request_channel or
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)
 }
 EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_close_release_chan);
 
+/**
+ * snd_dmaengine_pcm_refine_runtime_hwparams - Refine runtime hw params
+ * @substream: PCM substream
+ * @dma_data: DAI DMA data
+ * @hw: PCM hw params
+ * @chan: DMA channel to use for data transfers
+ *
+ * Returns 0 on success, a negative error code otherwise.
+ *
+ * This function will query DMA capability, then refine the pcm hardware
+ * parameters.
+ */
+int snd_dmaengine_pcm_refine_runtime_hwparams(
+	struct snd_pcm_substream *substream,
+	struct snd_dmaengine_dai_dma_data *dma_data,
+	struct snd_pcm_hardware *hw,
+	struct dma_chan *chan)
+{
+	struct dma_slave_caps dma_caps;
+	u32 addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
+			  BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
+			  BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
+	snd_pcm_format_t i;
+	int ret = 0;
+
+	if (!hw || !chan || !dma_data)
+		return -EINVAL;
+
+	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;
+	}
+
+	/*
+	 * 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;
+}
+EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_refine_runtime_hwparams);
+
 MODULE_LICENSE("GPL");
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
@@ -118,12 +118,7 @@  static int dmaengine_pcm_set_runtime_hwparams(struct snd_pcm_substream *substrea
 	struct device *dma_dev = dmaengine_dma_dev(pcm, substream);
 	struct dma_chan *chan = pcm->chan[substream->stream];
 	struct snd_dmaengine_dai_dma_data *dma_data;
-	struct dma_slave_caps dma_caps;
 	struct snd_pcm_hardware hw;
-	u32 addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
-			  BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
-			  BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
-	snd_pcm_format_t i;
 	int ret;
 
 	if (pcm->config && pcm->config->pcm_hardware)
@@ -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;
-	}
-
-	/*
-	 * 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;
-			}
-		}
+	ret = snd_dmaengine_pcm_refine_runtime_hwparams(substream,
+							dma_data,
+							&hw,
+							chan);
+	if (ret)
+		return ret;
 
 	return snd_soc_set_runtime_hwparams(substream, &hw);
 }