linux-kernel - Re: [PATCH v7, 12/15] media: mtk-vcodec: Support 34bits dma address for vdec

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Date:   Wed, 27 Oct 2021 11:44:35 +0800
From:   "yunfei.dong@...iatek.com" <yunfei.dong@...iatek.com>
To:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Alexandre Courbot <acourbot@...omium.org>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Tzung-Bi Shih <tzungbi@...omium.org>,
        "Tiffany Lin" <tiffany.lin@...iatek.com>,
        Andrew-CT Chen <andrew-ct.chen@...iatek.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Tomasz Figa <tfiga@...gle.com>
CC:     Hsin-Yi Wang <hsinyi@...omium.org>,
        Fritz Koenig <frkoenig@...omium.org>,
        Dafna Hirschfeld <dafna.hirschfeld@...labora.com>,
        Benjamin Gaignard <benjamin.gaignard@...labora.com>,
        Daniel Vetter <daniel@...ll.ch>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        Irui Wang <irui.wang@...iatek.com>,
        <linux-media@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <srv_heupstream@...iatek.com>,
        <linux-mediatek@...ts.infradead.org>,
        <Project_Global_Chrome_Upstream_Group@...iatek.com>
Subject: Re: [PATCH v7, 12/15] media: mtk-vcodec: Support 34bits dma address
 for vdec

Hi AngeloGioacchino,

Thanks for your suggestion.
On Thu, 2021-10-14 at 13:02 +0200, AngeloGioacchino Del Regno wrote:
> > 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@...iatek.com>
> > ---
> >   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 de83e3b821b4..da963cdac96b 100644
> > --- a/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_drv.c
> > +++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_drv.c
> > @@ -376,6 +376,9 @@ 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));
> > +
> 
Will fix in patch v8.
> This function returns 0 for success, or negative number for failure:
> please check
> the return value, or this driver may not work correctly in some
> corner cases.
> 
> Regards,
> - Angelo
> 
> >   	for (i = 0; i < MTK_VDEC_HW_MAX; i++)
> >   		mutex_init(&dev->dec_mutex[i]);
> >   	spin_lock_init(&dev->irqlock);
> >