From: Trevor Wu <trevor.wu@mediatek.com>
To: <broonie@kernel.org>, <tiwai@suse.com>, <robh+dt@kernel.org>,
<matthias.bgg@gmail.com>
Cc: devicetree@vger.kernel.org, alsa-devel@alsa-project.org,
linux-kernel@vger.kernel.org, linux-mediatek@lists.infradead.org,
trevor.wu@mediatek.com, yc.hung@mediatek.com,
linux-arm-kernel@lists.infradead.org
Subject: [PATCH 1/2] ASoC: mediatek: mt8195: support reserved memory assignment
Date: Tue, 30 Nov 2021 13:39:04 +0800 [thread overview]
Message-ID: <20211130053905.28470-2-trevor.wu@mediatek.com> (raw)
In-Reply-To: <20211130053905.28470-1-trevor.wu@mediatek.com>
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>
---
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 2bb05a828e8d..8a6db24116e3 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;
--
2.18.0
next prev parent reply other threads:[~2021-11-30 5:41 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-30 5:39 [PATCH 0/2] ASoC: mediatek: support memory-region assignment Trevor Wu
2021-11-30 5:39 ` Trevor Wu [this message]
2021-11-30 5:39 ` [PATCH 2/2] dt-bindings: mediatek: mt8195: add memory-region property Trevor Wu
2021-12-06 18:00 ` [PATCH 0/2] ASoC: mediatek: support memory-region assignment Mark Brown
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