The patch
ASoC: stm32: i2s: skip useless write in slave mode
has been applied to the asoc tree at
https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git
All being well this means that it will be integrated into the linux-next tree (usually sometime in the next 24 hours) and sent to Linus during the next merge window (or sooner if it is a bug fix), however if problems are discovered then the patch may be dropped or reverted.
You may get further e-mails resulting from automated or manual testing and review of the tree, please engage with people reporting problems and send followup patches addressing any issues that are reported if needed.
If any updates are required or you are submitting further changes they should be sent as incremental updates against current git, existing patches will not be replaced.
Please add any relevant lists and maintainers to the CCs when replying to this mail.
Thanks, Mark
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); }