diff options
Diffstat (limited to 'sound/soc/soc-generic-dmaengine-pcm.c')
| -rw-r--r-- | sound/soc/soc-generic-dmaengine-pcm.c | 37 |
1 files changed, 36 insertions, 1 deletions
diff --git a/sound/soc/soc-generic-dmaengine-pcm.c b/sound/soc/soc-generic-dmaengine-pcm.c index 5bace124ef43..6307f85e871b 100644 --- a/sound/soc/soc-generic-dmaengine-pcm.c +++ b/sound/soc/soc-generic-dmaengine-pcm.c @@ -119,7 +119,10 @@ static int dmaengine_pcm_set_runtime_hwparams(struct snd_pcm_substream *substrea struct snd_dmaengine_dai_dma_data *dma_data; struct dma_slave_caps dma_caps; struct snd_pcm_hardware hw; - int ret; + u32 addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | + BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | + BIT(DMA_SLAVE_BUSWIDTH_4_BYTES); + int i, ret; if (pcm->config && pcm->config->pcm_hardware) return snd_soc_set_runtime_hwparams(substream, @@ -146,6 +149,38 @@ static int dmaengine_pcm_set_runtime_hwparams(struct snd_pcm_substream *substrea 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.dstn_addr_widths; + else + addr_widths = dma_caps.src_addr_widths; + } + + /* + * 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 = 0; 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 |= (1LL << i); + break; + default: + /* Unsupported types */ + break; + } } return snd_soc_set_runtime_hwparams(substream, &hw); |