linux-kernel - [PATCH V2] dmaengine: sprd: add dma mask interface in probe

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Message-ID: <20230919023050.3777-1-kaiwei.liu@unisoc.com>
Date:   Tue, 19 Sep 2023 10:30:50 +0800
From:   Kaiwei Liu <kaiwei.liu@...soc.com>
To:     Vinod Koul <vkoul@...nel.org>, Orson Zhai <orsonzhai@...il.com>,
        Baolin Wang <baolin.wang@...ux.alibaba.com>,
        Chunyan Zhang <zhang.lyra@...il.com>
CC:     <dmaengine@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        kaiwei liu <liukaiwei086@...il.com>,
        Wenming Wu <wenming.wu@...soc.com>
Subject: [PATCH V2] dmaengine: sprd: add dma mask interface in probe

In the probe of DMA, the default addressing range is 32 bits,
while the actual DMA hardware addressing range used is 36 bits.
So add dma_set_mask_and_coherent function to match DMA
addressing range.

Signed-off-by: Kaiwei Liu <kaiwei.liu@...soc.com>
---
Change in V2:
-Change subject line.
-Modify error message to make it more readable.
---
 drivers/dma/sprd-dma.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/dma/sprd-dma.c b/drivers/dma/sprd-dma.c
index 20c3cb1ef2f5..0e146550dfbb 100644
--- a/drivers/dma/sprd-dma.c
+++ b/drivers/dma/sprd-dma.c
@@ -1115,6 +1115,15 @@ static int sprd_dma_probe(struct platform_device *pdev)
 	u32 chn_count;
 	int ret, i;
 
+	ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(36));
+	if (ret) {
+		ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
+		if (ret) {
+			dev_err(&pdev->dev, "dma_set_mask_and_coherent failed\n");
+			return ret;
+		}
+	}
+
 	/* Parse new and deprecated dma-channels properties */
 	ret = device_property_read_u32(&pdev->dev, "dma-channels", &chn_count);
 	if (ret)
-- 
2.17.1