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authorPeter Ujfalusi <peter.ujfalusi@ti.com>2014-07-03 08:51:55 +0400
committerMark Brown <broonie@linaro.org>2014-07-04 21:55:25 +0400
commit75f850fc229e090d3073708f55ca628db650b64e (patch)
tree0d2f384ecf535d0ca8cb10961f46066608859adb /sound/core
parent2d38df12832186e592c1330dc5c363a778800cf1 (diff)
downloadlinux-75f850fc229e090d3073708f55ca628db650b64e.tar.xz
ALSA: pcm_dmaengine: Correct support for 24bits physical sample widths
In case of _3LE/_3BE formats the samples are stored in 3 consecutive bytes without padding it to 4 bytes. This means that the DMA needs to be able to support 3 bytes word length in order to read/write the samples from memory correctly. Originally the code treated 24 bits physical length samples as they were 32 bits which leads to corruption when playing or recording audio. The hw.formats field has already been prepared to exclude formats not supported by the DMA engine in use, which means that only on platforms where 3 bytes is supported by the DMA will be able to use this format. Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com> Acked-by: Vinod Koul <vinod.koul@intel.com> Acked-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Mark Brown <broonie@linaro.org>
Diffstat (limited to 'sound/core')
-rw-r--r--sound/core/pcm_dmaengine.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/sound/core/pcm_dmaengine.c b/sound/core/pcm_dmaengine.c
index d5611ec80381..6542c4083594 100644
--- a/sound/core/pcm_dmaengine.c
+++ b/sound/core/pcm_dmaengine.c
@@ -72,6 +72,8 @@ int snd_hwparams_to_dma_slave_config(const struct snd_pcm_substream *substream,
buswidth = DMA_SLAVE_BUSWIDTH_1_BYTE;
else if (bits == 16)
buswidth = DMA_SLAVE_BUSWIDTH_2_BYTES;
+ else if (bits == 24)
+ buswidth = DMA_SLAVE_BUSWIDTH_3_BYTES;
else if (bits <= 32)
buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES;
else