diff options
| author | Shengjiu Wang <shengjiu.wang@nxp.com> | 2020-06-12 15:37:51 +0800 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2020-06-12 14:18:04 +0100 |
| commit | b287a6d9723c601dd947f1c27d4cc0192e384a5a (patch) | |
| tree | eda9dcf3904cf052a079c37f6502232d98471020 /sound/soc/fsl/fsl_asrc_common.h | |
| parent | 706e2c8811585f42612b6cff218ab3adbe63a4ee (diff) | |
ASoC: fsl_asrc_dma: Fix data copying speed issue with EDMA
With EDMA, there is two dma channels can be used for dev_to_dev,
one is from ASRC, one is from another peripheral (ESAI or SAI).
If we select the dma channel of ASRC, there is an issue for ideal
ratio case, the speed of copy data is faster than sample
frequency, because ASRC output data is very fast in ideal ratio
mode.
So it is reasonable to use the dma channel of Back-End peripheral.
then copying speed of DMA is controlled by data consumption
speed in the peripheral FIFO,
Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
Reviewed-by: Nicolin Chen <nicoleotsuka@gmail.com>
Link: https://lore.kernel.org/r/424ed6c249bafcbe30791c9de0352821c5ea67e2.1591947428.git.shengjiu.wang@nxp.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'sound/soc/fsl/fsl_asrc_common.h')
| -rw-r--r-- | sound/soc/fsl/fsl_asrc_common.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/sound/soc/fsl/fsl_asrc_common.h b/sound/soc/fsl/fsl_asrc_common.h index 77665b15c8db..7e1c13ca37f1 100644 --- a/sound/soc/fsl/fsl_asrc_common.h +++ b/sound/soc/fsl/fsl_asrc_common.h @@ -32,6 +32,7 @@ enum asrc_pair_index { * @dma_chan: inputer and output DMA channels * @dma_data: private dma data * @pos: hardware pointer position + * @req_dma_chan: flag to release dev_to_dev chan * @private: pair private area */ struct fsl_asrc_pair { @@ -45,6 +46,7 @@ struct fsl_asrc_pair { struct dma_chan *dma_chan[2]; struct imx_dma_data dma_data; unsigned int pos; + bool req_dma_chan; void *private; }; |