diff options
Diffstat (limited to 'kernel/sound/soc/soc-generic-dmaengine-pcm.c')
| -rw-r--r-- | kernel/sound/soc/soc-generic-dmaengine-pcm.c | 25 |
1 files changed, 14 insertions, 11 deletions
diff --git a/kernel/sound/soc/soc-generic-dmaengine-pcm.c b/kernel/sound/soc/soc-generic-dmaengine-pcm.c index c9917ca5d..6fd1906af 100644 --- a/kernel/sound/soc/soc-generic-dmaengine-pcm.c +++ b/kernel/sound/soc/soc-generic-dmaengine-pcm.c @@ -24,6 +24,12 @@ #include <sound/dmaengine_pcm.h> +/* + * The platforms dmaengine driver does not support reporting the amount of + * bytes that are still left to transfer. + */ +#define SND_DMAENGINE_PCM_FLAG_NO_RESIDUE BIT(31) + struct dmaengine_pcm { struct dma_chan *chan[SNDRV_PCM_STREAM_LAST + 1]; const struct snd_dmaengine_pcm_config *config; @@ -222,14 +228,18 @@ static struct dma_chan *dmaengine_pcm_compat_request_channel( return snd_dmaengine_pcm_request_channel(fn, dma_data->filter_data); } -static bool dmaengine_pcm_can_report_residue(struct dma_chan *chan) +static bool dmaengine_pcm_can_report_residue(struct device *dev, + struct dma_chan *chan) { struct dma_slave_caps dma_caps; int ret; ret = dma_get_slave_caps(chan, &dma_caps); - if (ret != 0) - return true; + if (ret != 0) { + dev_warn(dev, "Failed to get DMA channel capabilities, falling back to period counting: %d\n", + ret); + return false; + } if (dma_caps.residue_granularity == DMA_RESIDUE_GRANULARITY_DESCRIPTOR) return false; @@ -289,14 +299,7 @@ static int dmaengine_pcm_new(struct snd_soc_pcm_runtime *rtd) if (ret) return ret; - /* - * This will only return false if we know for sure that at least - * one channel does not support residue reporting. If the DMA - * driver does not implement the slave_caps API we rely having - * the NO_RESIDUE flag set manually in case residue reporting is - * not supported. - */ - if (!dmaengine_pcm_can_report_residue(pcm->chan[i])) + if (!dmaengine_pcm_can_report_residue(dev, pcm->chan[i])) pcm->flags |= SND_DMAENGINE_PCM_FLAG_NO_RESIDUE; } |