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SubjectApplied "ASoC: sprd: Add reserved DMA memory support" to the asoc tree
The patch

ASoC: sprd: Add reserved DMA memory support

has been applied to the asoc tree at

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From 1587a061ef562de0d97c82a95863e191bcd69d63 Mon Sep 17 00:00:00 2001
From: Baolin Wang <>
Date: Fri, 12 Apr 2019 14:40:17 +0800
Subject: [PATCH] ASoC: sprd: Add reserved DMA memory support

For Spreadtrum audio platform driver, it need allocate a larger DMA buffer
dynamically to copy audio data between userspace and kernel space, but that
will increase the risk of memory allocation failure especially the system
is under heavy load situation.

To make sure the audio can work in this scenario, we usually reserve one
region of memory to be used as a shared pool of DMA buffers for the
platform component. So add of_reserved_mem_device_init_by_idx() function
to initialize the shared pool of DMA buffers to be used by the platform

Signed-off-by: Baolin Wang <>
Signed-off-by: Mark Brown <>
sound/soc/sprd/sprd-pcm-dma.c | 7 +++++++
1 file changed, 7 insertions(+)

diff --git a/sound/soc/sprd/sprd-pcm-dma.c b/sound/soc/sprd/sprd-pcm-dma.c
index 9be6d4b2bf74..d38ebbbbf169 100644
--- a/sound/soc/sprd/sprd-pcm-dma.c
+++ b/sound/soc/sprd/sprd-pcm-dma.c
@@ -6,6 +6,7 @@
#include <linux/dma/sprd-dma.h>
#include <linux/kernel.h>
#include <linux/module.h>
+#include <linux/of_reserved_mem.h>
#include <linux/platform_device.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
@@ -530,8 +531,14 @@ static const struct snd_soc_component_driver sprd_soc_component = {

static int sprd_soc_platform_probe(struct platform_device *pdev)
+ struct device_node *np = pdev->dev.of_node;
int ret;

+ ret = of_reserved_mem_device_init_by_idx(&pdev->dev, np, 0);
+ if (ret)
+ dev_warn(&pdev->dev,
+ "no reserved DMA memory for audio platform device\n");
ret = devm_snd_soc_register_component(&pdev->dev, &sprd_soc_component,
NULL, 0);
if (ret)
 \ /
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