linux-kernel - [PATCH] ASoC: SOF: mediatek: mt8186 modify dram type as non-cache

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Message-ID: <20230803075028.32170-1-trevor.wu@mediatek.com>
Date:   Thu, 3 Aug 2023 15:50:28 +0800
From:   Trevor Wu <trevor.wu@...iatek.com>
To:     <pierre-louis.bossart@...ux.intel.com>,
        <peter.ujfalusi@...ux.intel.com>,
        <yung-chuan.liao@...ux.intel.com>,
        <ranjani.sridharan@...ux.intel.com>,
        <kai.vehmanen@...ux.intel.com>, <daniel.baluta@....com>,
        <broonie@...nel.org>, <lgirdwood@...il.com>, <tiwai@...e.com>,
        <perex@...ex.cz>, <matthias.bgg@...il.com>,
        <angelogioacchino.delregno@...labora.com>
CC:     <trevor.wu@...iatek.com>, <yc.hung@...iatek.com>,
        <allen-kh.cheng@...iatek.com>,
        <sound-open-firmware@...a-project.org>,
        <alsa-devel@...a-project.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH] ASoC: SOF: mediatek: mt8186 modify dram type as non-cache

To prevent incorrect access between the host and DSP sides, we need to
modify DRAM as a non-cache memory type. Additionally, we can retrieve
the size of shared DMA from the device tree.

Signed-off-by: Trevor Wu <trevor.wu@...iatek.com>
Reviewed-by: Yaochun Hung <yc.hung@...iatek.com>
Reviewed-by: Kuan-Hsun Cheng <Allen-KH.Cheng@...iatek.com>
---
 sound/soc/sof/mediatek/mt8186/mt8186.c | 40 +++++++++++++++-----------
 1 file changed, 23 insertions(+), 17 deletions(-)

diff --git a/sound/soc/sof/mediatek/mt8186/mt8186.c b/sound/soc/sof/mediatek/mt8186/mt8186.c
index 3e0ea0e109e2..f587edf9e0a7 100644
--- a/sound/soc/sof/mediatek/mt8186/mt8186.c
+++ b/sound/soc/sof/mediatek/mt8186/mt8186.c
@@ -111,6 +111,14 @@ static int platform_parse_resource(struct platform_device *pdev, void *data)
 
 	dev_dbg(dev, "DMA %pR\n", &res);
 
+	adsp->pa_shared_dram = (phys_addr_t)res.start;
+	adsp->shared_size = resource_size(&res);
+	if (adsp->pa_shared_dram & DRAM_REMAP_MASK) {
+		dev_err(dev, "adsp shared dma memory(%#x) is not 4K-aligned\n",
+			(u32)adsp->pa_shared_dram);
+		return -EINVAL;
+	}
+
 	ret = of_reserved_mem_device_init(dev);
 	if (ret) {
 		dev_err(dev, "of_reserved_mem_device_init failed\n");
@@ -244,23 +252,18 @@ static int adsp_shared_base_ioremap(struct platform_device *pdev, void *data)
 {
 	struct device *dev = &pdev->dev;
 	struct mtk_adsp_chip_info *adsp = data;
-	u32 shared_size;
 
 	/* remap shared-dram base to be non-cachable */
-	shared_size = TOTAL_SIZE_SHARED_DRAM_FROM_TAIL;
-	adsp->pa_shared_dram = adsp->pa_dram + adsp->dramsize - shared_size;
-	if (adsp->va_dram) {
-		adsp->shared_dram = adsp->va_dram + DSP_DRAM_SIZE - shared_size;
-	} else {
-		adsp->shared_dram = devm_ioremap(dev, adsp->pa_shared_dram,
-						 shared_size);
-		if (!adsp->shared_dram) {
-			dev_err(dev, "ioremap failed for shared DRAM\n");
-			return -ENOMEM;
-		}
+	adsp->shared_dram = devm_ioremap(dev, adsp->pa_shared_dram,
+					 adsp->shared_size);
+	if (!adsp->shared_dram) {
+		dev_err(dev, "failed to ioremap base %pa size %#x\n",
+			adsp->shared_dram, adsp->shared_size);
+		return -ENOMEM;
 	}
-	dev_dbg(dev, "shared-dram vbase=%p, phy addr :%pa, size=%#x\n",
-		adsp->shared_dram, &adsp->pa_shared_dram, shared_size);
+
+	dev_dbg(dev, "shared-dram vbase=%p, phy addr :%pa,  size=%#x\n",
+		adsp->shared_dram, &adsp->pa_shared_dram, adsp->shared_size);
 
 	return 0;
 }
@@ -307,9 +310,12 @@ static int mt8186_dsp_probe(struct snd_sof_dev *sdev)
 		return -ENOMEM;
 	}
 
-	sdev->bar[SOF_FW_BLK_TYPE_SRAM] = devm_ioremap_wc(sdev->dev,
-							  priv->adsp->pa_dram,
-							  priv->adsp->dramsize);
+	priv->adsp->va_sram = sdev->bar[SOF_FW_BLK_TYPE_IRAM];
+
+	sdev->bar[SOF_FW_BLK_TYPE_SRAM] = devm_ioremap(sdev->dev,
+						       priv->adsp->pa_dram,
+						       priv->adsp->dramsize);
+
 	if (!sdev->bar[SOF_FW_BLK_TYPE_SRAM]) {
 		dev_err(sdev->dev, "failed to ioremap base %pa size %#x\n",
 			&priv->adsp->pa_dram, priv->adsp->dramsize);
-- 
2.18.0