MLK-20096: ASoC: fsl_asrc_m2m: fix noise issue for 8k5c to 176k5c conversion
Compare with imx6, the conversion of 8kHz 5channel to 176kHz is ok.
And compare the output we found that about every 48K bytes, there will be
additional data be added, which cause noise.
In this case, there will be two sg_nodes, for the maxmum output size exceed
the ASRC_MAX_BUFFER_SIZE, each size is ASRC_MAX_BUFFER_SIZE, it is 49152.
the value can't be exact divided by channel * word_with * watermark = 40.
So the EDMA can't finish the copy with correct size.
There is limitation of EMDA described in commit 3519b67ac01c
("MLK-19151: ASoC: fsl_asrc: fix dma timeout issue for imx8qxp")
EDMA just copy 49120 bytes, there will 32 bytes wrong data.
According to this limitation, this commit is to change the maxburst to 1
for EDMA case, then EDMA can do what we expect correctly.
Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
1 file changed
