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soundwire: cadence: clear FIFO to avoid pop noise issue on playback start

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Driver should clear FIFO in PDI, or the previously stored sample data
in FIFO will generate pop noise when stream is started. The soft reset
bit will clear all the FIFO to zero and is self-cleared after that.

Signed-off-by: randerwang <rander.wang@linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20200317163329.25501-18-pierre-louis.bossart@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
randerwang 2020-03-17 11:33:29 -05:00 committed by Vinod Koul
parent 2c800e3ba7
commit b468a785bd
1 changed files with 1 additions and 0 deletions
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drivers/soundwire/cadence_master.c
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@ -1503,6 +1503,7 @@ void sdw_cdns_config_stream(struct sdw_cdns *cdns,
cdns_updatel(cdns, offset, CDNS_PORTCTRL_DIRN, val);
val = pdi->num;
val |= CDNS_PDI_CONFIG_SOFT_RESET;
val |= ((1 << ch) - 1) << SDW_REG_SHIFT(CDNS_PDI_CONFIG_CHANNEL);
cdns_writel(cdns, CDNS_PDI_CONFIG(pdi->num), val);
}