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SubjectApplied "ASoC: stm32: i2s: improve channel capabilities handling" to the asoc tree
The patch

ASoC: stm32: i2s: improve channel capabilities handling

has been applied to the asoc tree at

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From c2dc8b2c114c22d7a04cf26a7c7d04faaa757143 Mon Sep 17 00:00:00 2001
From: Olivier Moysan <>
Date: Mon, 11 Mar 2019 16:26:29 +0100
Subject: [PATCH] ASoC: stm32: i2s: improve channel capabilities handling

Use alsa snd_pcm_hw_constraint_single service to manage
channels restriction. This provides better status on driver
limitations, to the application.

Signed-off-by: Olivier Moysan <>
Signed-off-by: Mark Brown <>
sound/soc/stm/stm32_i2s.c | 10 ++++------
1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/sound/soc/stm/stm32_i2s.c b/sound/soc/stm/stm32_i2s.c
index 783b33497435..06bbbef74b3a 100644
--- a/sound/soc/stm/stm32_i2s.c
+++ b/sound/soc/stm/stm32_i2s.c
@@ -496,12 +496,6 @@ static int stm32_i2s_configure(struct snd_soc_dai *cpu_dai,
unsigned int fthlv;
int ret;

- if ((params_channels(params) == 1) &&
- dev_err(cpu_dai->dev, "Mono mode supported only by DSP_A\n");
- return -EINVAL;
- }
switch (format) {
case 16:
@@ -551,6 +545,10 @@ static int stm32_i2s_startup(struct snd_pcm_substream *substream,
i2s->substream = substream;
spin_unlock_irqrestore(&i2s->irq_lock, flags);

+ snd_pcm_hw_constraint_single(substream->runtime,
ret = clk_prepare_enable(i2s->i2sclk);
if (ret < 0) {
dev_err(cpu_dai->dev, "Failed to enable clock: %d\n", ret);
 \ /
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