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SubjectRe: [PATCH v4 4/4] dmaengine: mediatek-cqdma: add dma mask for capability
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On Thu, 2020-05-28 at 16:10 +0200, Matthias Brugger wrote:
>
> On 28/05/2020 11:57, EastL wrote:
> > This patch add dma mask for capability.
> >
> > Change-Id: I31f4622f9541d769702029532e5f5f185815dda2
>
> No Change-Id in the commit message please.
>
> > Signed-off-by: EastL <EastL.Lee@mediatek.com>
> > ---
> > 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;
> }
>
> > + dev_info(&pdev->dev,
> > + "Using 0 as missing dma-channel-mask property\n");
>
> dev_warn should be OK.
>
> > + } 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.

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

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