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ASoC: dmaengine: Document support for TX only or RX only streams 

We intentionally do not return an error if we get a permanent failure
from dma_request_chan() in order to support systems which have TX only
or RX only channels. Add a comment documenting this.

Reported-by: Andy Shevchenko <andriy.shevchenko@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@intel.com>
Link: https://lore.kernel.org/r/20201008161105.21804-1-broonie@kernel.org
Signed-off-by: Mark Brown <broonie@kernel.org>
zero-sugar-mainline-defconfig
Mark Brown 2020-10-08 17:11:05 +01:00
parent b899e4fd7a
commit 86f29c7442
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1 changed files with 5 additions and 0 deletions
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5
sound/soc/soc-generic-dmaengine-pcm.c
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@ -386,6 +386,11 @@ static int dmaengine_pcm_request_chan_of(struct dmaengine_pcm *pcm,
name = config->chan_names[i];
chan = dma_request_chan(dev, name);
if (IS_ERR(chan)) {
/*
* Only report probe deferral errors, channels
* might not be present for devices that
* support only TX or only RX.
*/
if (PTR_ERR(chan) == -EPROBE_DEFER)
return -EPROBE_DEFER;
pcm->chan[i] = NULL;