From 7b6b0049e2b70d103adf1b7d0320802f70ddceca Mon Sep 17 00:00:00 2001 From: Olivier Moysan 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 Signed-off-by: Mark Brown --- 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); } -- 2.39.5