12 Jun
2020
12 Jun
'20
10:08 a.m.
On Fri, Jun 12, 2020 at 03:37:50PM +0800, Shengjiu Wang wrote:
The dma channel has been requested by Back-End cpu dai driver already. If fsl_asrc_dma requests dma chan with same dma:tx symlink, then there will be below warning with SDMA.
[ 48.174236] fsl-esai-dai 2024000.esai: Cannot create DMA dma:tx symlink
So if we can reuse the dma channel of Back-End, then the issue can be fixed.
In order to get the dma channel which is already requested in Back-End. we use the exported two functions (snd_soc_lookup_component_nolocked and soc_component_to_pcm). If we can get the dma channel, then reuse it, if can't, then request a new one.
Signed-off-by: Shengjiu Wang shengjiu.wang@nxp.com
Reviewed-by: Nicolin Chen nicoleotsuka@gmail.com