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Re: [PATCH 1/2] ASoC: dmaengine_pcm: Add support for packed transfers

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> On 27.04.2016, at 15:26, Matthias Reichl <hias@horus.com> wrote:
> 
> dmaengine_pcm currently only supports setups where FIFO reads/writes
> correspond to exactly one sample, eg 16-bit sample data is transferred
> via 16-bit FIFO accesses, 32-bit data via 32-bit accesses.
> 
> This patch adds support for setups with fixed width FIFOs where
> multiple samples are packed into a larger word.
> 
> For example setups with a 32-bit wide FIFO register that expect
> 16-bit sample transfers to be done with the left+right sample data
> packed into a 32-bit word.
> 
> Support for packed transfers is controlled via the
> SND_DMAENGINE_PCM_DAI_FLAG_PACK flag in snd_dmaengine_dai_dma_data.flags
> 
> If this flag is set dmaengine_pcm doesn't put any restriction on the
> supported formats and sets the DMA transfer width to undefined.
> 
> This means control over the constraints is now transferred to the DAI
> driver and it's responsible to provide proper configuration and
> check for possible corner cases that aren't handled by the ALSA core.
> 
> Signed-off-by: Matthias Reichl <hias@horus.com>

Tested-by: Martin Sperl <kernel@martin.sperl.org>

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[PATCH 1/2] ASoC: dmaengine_pcm: Add support for packed transfers Matthias Reichl <hias@horus.com> - 2016-04-27 15:40 +0200
  [PATCH 2/2] ASoC: bcm2835: Add S16_LE support via packed DMA transfers Matthias Reichl <hias@horus.com> - 2016-04-27 15:40 +0200
    Re: [PATCH 2/2] ASoC: bcm2835: Add S16_LE support via packed DMA transfers Martin Sperl <kernel@martin.sperl.org> - 2016-04-27 16:40 +0200
    Applied "ASoC: bcm2835: Add S16_LE support via packed DMA transfers" to the asoc tree Mark Brown <broonie@kernel.org> - 2016-04-27 18:40 +0200
    Re: [PATCH 2/2] ASoC: bcm2835: Add S16_LE support via packed DMA transfers Eric Anholt <eric@anholt.net> - 2016-04-27 21:00 +0200
  Re: [PATCH 1/2] ASoC: dmaengine_pcm: Add support for packed transfers Lars-Peter Clausen <lars@metafoo.de> - 2016-04-27 16:20 +0200
  Re: [PATCH 1/2] ASoC: dmaengine_pcm: Add support for packed transfers Martin Sperl <kernel@martin.sperl.org> - 2016-04-27 16:40 +0200
  Applied "ASoC: dmaengine_pcm: Add support for packed transfers" to the asoc tree Mark Brown <broonie@kernel.org> - 2016-04-27 18:40 +0200

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