From a8e93877488fa02c6b95a937ecf8bf25dde9ac1a Mon Sep 17 00:00:00 2001
From: Trevor Wu <trevor.wu@mediatek.com>
Date: Tue, 30 Nov 2021 13:39:04 +0800
Subject: [PATCH] ASoC: mediatek: mt8195: support reserved memory assignment
For security purpose, restrict the memory assess region of AFE memif.
The specified memory region should be assigned from DTS.
Signed-off-by: Trevor Wu <trevor.wu@mediatek.com>
Link: https://lore.kernel.org/r/20211130053905.28470-2-trevor.wu@mediatek.com
Signed-off-by: Mark Brown <broonie@kernel.org>
---
sound/soc/mediatek/mt8195/mt8195-afe-pcm.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/sound/soc/mediatek/mt8195/mt8195-afe-pcm.c b/sound/soc/mediatek/mt8195/mt8195-afe-pcm.c
index 2bb05a828e8d2..8a6db24116e39 100644
--- a/sound/soc/mediatek/mt8195/mt8195-afe-pcm.c
+++ b/sound/soc/mediatek/mt8195/mt8195-afe-pcm.c
@@ -14,6 +14,7 @@
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_platform.h>
+#include <linux/of_reserved_mem.h>
#include <linux/pm_runtime.h>
#include "mt8195-afe-common.h"
#include "mt8195-afe-clk.h"
@@ -3061,6 +3062,12 @@ static int mt8195_afe_pcm_dev_probe(struct platform_device *pdev)
int i, irq_id, ret;
struct snd_soc_component *component;
+ ret = of_reserved_mem_device_init(dev);
+ if (ret) {
+ dev_err(dev, "failed to assign memory region: %d\n", ret);
+ return ret;
+ }
+
ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(33));
if (ret)
return ret;
--
2.39.5