From 7b6b0049e2b70d103adf1b7d0320802f70ddceca Mon Sep 17 00:00:00 2001
From: Olivier Moysan <olivier.moysan@st.com>
Date: Tue, 26 Feb 2019 14:51:10 +0100
Subject: [PATCH] ASoC: stm32: i2s: skip useless write in slave mode
Dummy write in capture master mode is used to gate
bus clocks. This write is useless in slave mode
as the clocks are not managed by slave.
Signed-off-by: Olivier Moysan <olivier.moysan@st.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
---
sound/soc/stm/stm32_i2s.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/sound/soc/stm/stm32_i2s.c b/sound/soc/stm/stm32_i2s.c
index 42ce87a35104..47c334de6b09 100644
--- a/sound/soc/stm/stm32_i2s.c
+++ b/sound/soc/stm/stm32_i2s.c
@@ -623,8 +623,8 @@ static int stm32_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
} else {
ier = I2S_IER_OVRIE;
- if (i2s->refcount == 1)
- /* dummy write to trigger capture */
+ if (STM32_I2S_IS_MASTER(i2s) && i2s->refcount == 1)
+ /* dummy write to gate bus clocks */
regmap_write(i2s->regmap,
STM32_I2S_TXDR_REG, 0);
}