Re: [PATCH v6, 12/15] media: mtk-vcodec: Support 34bits dma address for vdec

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Le 01/09/2021 à 10:32, Yunfei Dong a écrit :
Use the dma_set_mask_and_coherent helper to set vdec
DMA bit mask to support 34bits iova space(16GB) that
the mt8192 iommu HW support.

Whole the iova range separate to 0~4G/4G~8G/8G~12G/12G~16G,
regarding which iova range VDEC actually locate, it
depends on the dma-ranges property of vdec dtsi node.

Signed-off-by: Yunfei Dong <yunfei.dong@xxxxxxxxxxxx>
---
  drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_drv.c | 3 +++
  1 file changed, 3 insertions(+)

diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_drv.c b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_drv.c
index 002352fcf8de..1a8d9308327d 100644
--- a/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_drv.c
+++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_drv.c
@@ -417,6 +417,9 @@ static int mtk_vcodec_probe(struct platform_device *pdev)
  		}
  	}
+ if (of_get_property(pdev->dev.of_node, "dma-ranges", NULL))
+		dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(34));
+

Hi Yunfei,

Does all SoC support 34bits iova space ?
If not you need to also check SoC version before setting dma mask.

Regards,
Benjamin

  	for (i = 0; i < MTK_VDEC_HW_MAX; i++)
  		mutex_init(&dev->dec_mutex[i]);
  	spin_lock_init(&dev->irqlock);



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