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SubjectApplied "ASoC: stm32: dfsdm: fix 16 bits record" to the asoc tree
The patch

ASoC: stm32: dfsdm: fix 16 bits record

has been applied to the asoc tree at for-5.5

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tree (usually sometime in the next 24 hours) and sent to Linus during
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From 8e55ea19125b65cffe42747359af99d545e85f2f Mon Sep 17 00:00:00 2001
From: Olivier Moysan <>
Date: Fri, 10 Jan 2020 14:11:31 +0100
Subject: [PATCH] ASoC: stm32: dfsdm: fix 16 bits record

In stm32_afsdm_pcm_cb function, the transfer size is provided in bytes.
However, samples are copied as 16 bits words from iio buffer.
Divide by two the transfer size, to copy the right number of samples.

Fixes: 1e7f6e1c69f0 ("ASoC: stm32: dfsdm: add 16 bits audio record support")

Signed-off-by: Olivier Moysan <>
Signed-off-by: Mark Brown <>
sound/soc/stm/stm32_adfsdm.c | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/sound/soc/stm/stm32_adfsdm.c b/sound/soc/stm/stm32_adfsdm.c
index 81c407da15c5..08696a4adb69 100644
--- a/sound/soc/stm/stm32_adfsdm.c
+++ b/sound/soc/stm/stm32_adfsdm.c
@@ -153,13 +153,13 @@ static const struct snd_soc_component_driver stm32_adfsdm_dai_component = {
.name = "stm32_dfsdm_audio",

-static void memcpy_32to16(void *dest, const void *src, size_t n)
+static void stm32_memcpy_32to16(void *dest, const void *src, size_t n)
unsigned int i = 0;
u16 *d = (u16 *)dest, *s = (u16 *)src;

- for (i = n; i > 0; i--) {
+ for (i = n >> 1; i > 0; i--) {
*d++ = *s++;
@@ -186,8 +186,8 @@ static int stm32_afsdm_pcm_cb(const void *data, size_t size, void *private)

if ((priv->pos + src_size) > buff_size) {
if (format == SNDRV_PCM_FORMAT_S16_LE)
- memcpy_32to16(&pcm_buff[priv->pos], src_buff,
- buff_size - priv->pos);
+ stm32_memcpy_32to16(&pcm_buff[priv->pos], src_buff,
+ buff_size - priv->pos);
memcpy(&pcm_buff[priv->pos], src_buff,
buff_size - priv->pos);
@@ -196,8 +196,8 @@ static int stm32_afsdm_pcm_cb(const void *data, size_t size, void *private)

if (format == SNDRV_PCM_FORMAT_S16_LE)
- memcpy_32to16(&pcm_buff[priv->pos],
- &src_buff[src_size - cur_size], cur_size);
+ stm32_memcpy_32to16(&pcm_buff[priv->pos],
+ &src_buff[src_size - cur_size], cur_size);
memcpy(&pcm_buff[priv->pos], &src_buff[src_size - cur_size],
 \ /
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