[PATCH 1/2] ASoC: mediatek: mt8195: support reserved memory assignment
From: Trevor Wu <hidden>
Date: 2021-11-30 05:39:30
Also in:
alsa-devel, linux-arm-kernel, linux-mediatek, lkml
Subsystem:
sound, sound - soc layer / dynamic audio power management (asoc), the rest · Maintainers:
Jaroslav Kysela, Takashi Iwai, Liam Girdwood, Mark Brown, Linus Torvalds
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 <redacted> --- 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