From:   Trevor Wu <trevor.wu@mediatek.com>
To:     <broonie@kernel.org>, <tiwai@suse.com>, <robh+dt@kernel.org>,
        <matthias.bgg@gmail.com>
CC:     <trevor.wu@mediatek.com>, <alsa-devel@alsa-project.org>,
        <linux-mediatek@lists.infradead.org>,
        <linux-arm-kernel@lists.infradead.org>,
        <linux-kernel@vger.kernel.org>, <devicetree@vger.kernel.org>,
        <yc.hung@mediatek.com>
Subject: [PATCH 1/2] ASoC: mediatek: mt8195: support reserved memory assignment
Date:   Tue, 30 Nov 2021 13:39:04 +0800
Message-ID: <20211130053905.28470-2-trevor.wu@mediatek.com>
In-Reply-To: <20211130053905.28470-1-trevor.wu@mediatek.com>
References: <20211130053905.28470-1-trevor.wu@mediatek.com>
MIME-Version: 1.0
Content-Type: text/plain
Precedence: bulk

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