On Thu, 2020-05-28 at 16:10 +0200, Matthias Brugger wrote:

On 28/05/2020 11:57, EastL wrote:

quoted

This patch add dma mask for capability.

Change-Id: I31f4622f9541d769702029532e5f5f185815dda2

No Change-Id in the commit message please.

quoted

Signed-off-by: EastL <redacted>
---
 drivers/dma/mediatek/mtk-cqdma.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/dma/mediatek/mtk-cqdma.c b/drivers/dma/mediatek/mtk-cqdma.c
index bca7118..1805a76 100644
--- a/drivers/dma/mediatek/mtk-cqdma.c
+++ b/drivers/dma/mediatek/mtk-cqdma.c

@@ -117,6 +117,7 @@ struct mtk_cqdma_vchan {
  * @clk:                    The clock that device internal is using
  * @dma_requests:           The number of VCs the device supports to
  * @dma_channels:           The number of PCs the device supports to
+ * @dma_mask:               A mask for DMA capability
  * @vc:                     The pointer to all available VCs
  * @pc:                     The pointer to all the underlying PCs
  */

@@ -126,6 +127,7 @@ struct mtk_cqdma_device {
 
 	u32 dma_requests;
 	u32 dma_channels;
+	u32 dma_mask;
 	struct mtk_cqdma_vchan *vc;
 	struct mtk_cqdma_pchan **pc;
 };

@@ -549,6 +551,7 @@ static void mtk_cqdma_hw_deinit(struct mtk_cqdma_device *cqdma)
 };
 MODULE_DEVICE_TABLE(of, mtk_cqdma_match);
 
+static u64 cqdma_dmamask;
 static int mtk_cqdma_probe(struct platform_device *pdev)
 {
 	struct mtk_cqdma_device *cqdma;

@@ -607,6 +610,16 @@ static int mtk_cqdma_probe(struct platform_device *pdev)
 		cqdma->dma_channels = MTK_CQDMA_NR_PCHANS;
 	}
 
+	if (pdev->dev.of_node && of_property_read_u32(pdev->dev.of_node,
+						      "dma-channel-mask",
+						      &cqdma->dma_mask)) {

I'd prefer:

if (pdev->dev.of_node)
    ret = of_property_read_u32(pdev->dev.of_node,
                               "dma-channel-mask",
                               &cqdma->dma_mask))
if (ret) {
    dev_warn(&pdev->dev,
             "Using 0 as missing dma-channel-mask
              property\n");
    cqdma->dma_mask = 0;
}

quoted

+		dev_info(&pdev->dev,
+			 "Using 0 as missing dma-channel-mask property\n");

dev_warn should be OK.

quoted

+	} else {
+		cqdma_dmamask = DMA_BIT_MASK(cqdma->dma_mask);
+		pdev->dev.dma_mask = &cqdma_dmamask;

if (dma_set_mask(&pdev->dev,
    DMA_BIT_MASK(cqdma->dma_mask)) {
         /* error out */
}

OK, I'll fix it on next version.

quoted

+	}
+
 	cqdma->pc = devm_kcalloc(&pdev->dev, cqdma->dma_channels,
 				 sizeof(*cqdma->pc), GFP_KERNEL);
 	if (!cqdma->pc)

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