Re: [PATCH v6 3/4] dmaengine: mediatek-cqdma: add dma mask for capability

Matthias Brugger
2020-07-03T14:55:01Z

On 02/07/2020 09:06, EastL Lee wrote:
> This patch add dma mask for capability.
>
> Signed-off-by: EastL Lee <EastL.Lee@mediatek.com>

Reviewed-by: Matthias Brugger <matthias.bgg@gmail.com>

> ---
> drivers/dma/mediatek/mtk-cqdma.c | 17 +++++++++++++++++
> 1 file changed, 17 insertions(+)
>
> diff --git a/drivers/dma/mediatek/mtk-cqdma.c b/drivers/dma/mediatek/mtk-cqdma.c
> index 905bbcb..1610632 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;
> };
> @@ -607,6 +609,21 @@ static int mtk_cqdma_probe(struct platform_device *pdev)
> cqdma->dma_channels = MTK_CQDMA_NR_PCHANS;
> }
>
> + if (pdev->dev.of_node)
> + err = of_property_read_u32(pdev->dev.of_node,
> + "dma-channel-mask",
> + &cqdma->dma_mask);
> + if (err) {
> + dev_warn(&pdev->dev,
> + "Using 0 as missing dma-channel-mask property\n");
> + cqdma->dma_mask = 0;
> + }
> +
> + if (dma_set_mask(&pdev->dev, DMA_BIT_MASK(cqdma->dma_mask))) {
> + dev_warn(&pdev->dev, "DMA set mask failed\n");
> + return -EINVAL;
> + }
> +
> cqdma->pc = devm_kcalloc(&pdev->dev, cqdma->dma_channels,
> sizeof(*cqdma->pc), GFP_KERNEL);
> if (!cqdma->pc)
>