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

[yunfei.dong@xxxxxxxxxxxx]

Hi Benjiamin,


On Thu, 2021-10-07 at 13:37 +0200, Benjamin Gaignard wrote:
> 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.
> 
Not all SoC support 34bits. Will add dma-ranges property in dtsi if the
SoC support 34bits.

like this:
dma-ranges = <>;

Thanks,
Yunfei Dong
> Regards,
> Benjamin
> 
> >   	for (i = 0; i < MTK_VDEC_HW_MAX; i++)
> >   		mutex_init(&dev->dec_mutex[i]);
> >   	spin_lock_init(&dev->irqlock);