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ASoC: davinci-mcasp: Clear TXSTAT register before activating serializers

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Follow the guideline from the TRM:
Before starting, clear the respective transmitter and receiver status
registers

To avoid stale state stored in the status registers.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Peter Ujfalusi 2018-11-16 15:41:38 +02:00 committed by Mark Brown
parent 61f94ee4a7
commit 1003c27acf
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1 changed files with 2 additions and 0 deletions
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sound/soc/davinci/davinci-mcasp.c
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@ -192,6 +192,7 @@ static void mcasp_start_rx(struct davinci_mcasp *mcasp)
}
/* Activate serializer(s) */
mcasp_set_reg(mcasp, DAVINCI_MCASP_RXSTAT_REG, 0xFFFFFFFF);
mcasp_set_ctl_reg(mcasp, DAVINCI_MCASP_GBLCTLR_REG, RXSERCLR);
/* Release RX state machine */
mcasp_set_ctl_reg(mcasp, DAVINCI_MCASP_GBLCTLR_REG, RXSMRST);
@ -220,6 +221,7 @@ static void mcasp_start_tx(struct davinci_mcasp *mcasp)
mcasp_set_ctl_reg(mcasp, DAVINCI_MCASP_GBLCTLX_REG, TXHCLKRST);
mcasp_set_ctl_reg(mcasp, DAVINCI_MCASP_GBLCTLX_REG, TXCLKRST);
/* Activate serializer(s) */
mcasp_set_reg(mcasp, DAVINCI_MCASP_TXSTAT_REG, 0xFFFFFFFF);
mcasp_set_ctl_reg(mcasp, DAVINCI_MCASP_GBLCTLX_REG, TXSERCLR);
/* wait for XDATA to be cleared */