From: Shengjiu Wang shengjiu.wang@nxp.com
[ Upstream commit b776c4a4618ec1b5219d494c423dc142f23c4e8f ]
There may be failure when start 1 channel recording after 8 channels recording. The reason is that the CHnF flags are not cleared successfully by software reset.
This issue is triggerred by the change of clearing software reset bit.
CHnF flags are write 1 clear bits. Clear them by force write.
Signed-off-by: Shengjiu Wang shengjiu.wang@nxp.com Link: https://lore.kernel.org/r/1651925654-32060-2-git-send-email-shengjiu.wang@nx... Signed-off-by: Mark Brown broonie@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- sound/soc/fsl/fsl_micfil.c | 8 ++++++++ 1 file changed, 8 insertions(+)
diff --git a/sound/soc/fsl/fsl_micfil.c b/sound/soc/fsl/fsl_micfil.c index ead4bfa13561..6c794605e33c 100644 --- a/sound/soc/fsl/fsl_micfil.c +++ b/sound/soc/fsl/fsl_micfil.c @@ -201,6 +201,14 @@ static int fsl_micfil_reset(struct device *dev) if (ret) return ret;
+ /* + * Set SRES should clear CHnF flags, But even add delay here + * the CHnF may not be cleared sometimes, so clear CHnF explicitly. + */ + ret = regmap_write_bits(micfil->regmap, REG_MICFIL_STAT, 0xFF, 0xFF); + if (ret) + return ret; + return 0; }