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ASoC: msm8916-wcd-digital: Reset RX interpolation path after use 

For some reason, attempting to route audio through QDSP6 on MSM8916
causes the RX interpolation path to get "stuck" after playing audio
a few times. In this situation, the analog codec part is still working,
but the RX path in the digital codec stops working, so you only hear
the analog parts powering up. After a reboot everything works again.

So far I was not able to reproduce the problem when using lpass-cpu.

The downstream kernel driver avoids this by resetting the RX
interpolation path after use. In mainline we do something similar
for the TX decimator (LPASS_CDC_CLK_TX_RESET_B1_CTL), but the
interpolator reset (LPASS_CDC_CLK_RX_RESET_CTL) got lost when the
msm8916-wcd driver was split into analog and digital.

Fix this problem by adding the reset to
msm8916_wcd_digital_enable_interpolator().

Fixes: 150db8c5af ("ASoC: codecs: Add msm8916-wcd digital codec")
Cc: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Stephan Gerhold <stephan@gerhold.net>
Link: https://lore.kernel.org/r/20200105102753.83108-1-stephan@gerhold.net
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Stephan Gerhold 2020-01-05 11:27:53 +01:00 committed by Mark Brown
parent 057efcf9fa
commit 85578bbd64
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 6 additions and 0 deletions
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6
sound/soc/codecs/msm8916-wcd-digital.c
View File

@ -586,6 +586,12 @@ static int msm8916_wcd_digital_enable_interpolator(
snd_soc_component_write(component, rx_gain_reg[w->shift],
snd_soc_component_read32(component, rx_gain_reg[w->shift]));
break;
case SND_SOC_DAPM_POST_PMD:
snd_soc_component_update_bits(component, LPASS_CDC_CLK_RX_RESET_CTL,
1 << w->shift, 1 << w->shift);
snd_soc_component_update_bits(component, LPASS_CDC_CLK_RX_RESET_CTL,
1 << w->shift, 0x0);
break;
}
return 0;
}