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ASoC: davinci-mcasp: Logic low for inactive output slots

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The default state when serializers are in inactive slots is Hi-Z.
In some cases, there are no additional components driving the data
lines to a safe state so they might have noise.

While in inactive slots, the McASP AXR pins configured as outputs
can be driven low through the serializer pin drive mode setting
(DISMOD) to prevent such noise.

Signed-off-by: Misael Lopez Cruz <misael.lopez@ti.com>
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Misael Lopez Cruz
2015-06-08 16:03:47 +03:00
committed by Mark Brown
parent 518f6bab13
commit 19db62ea05
2 changed files with 6 additions and 1 deletions
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2
sound/soc/davinci/davinci-mcasp.c
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@@ -686,6 +686,8 @@ static int mcasp_common_hw_param(struct davinci_mcasp *mcasp, int stream,
if (mcasp->serial_dir[i] == TX_MODE &&
tx_ser < max_active_serializers) {
mcasp_set_bits(mcasp, DAVINCI_MCASP_PDIR_REG, AXR(i));
mcasp_mod_bits(mcasp, DAVINCI_MCASP_XRSRCTL_REG(i),
DISMOD_LOW, DISMOD_MASK);
tx_ser++;
} else if (mcasp->serial_dir[i] == RX_MODE &&
rx_ser < max_active_serializers) {