linux-kernel - Re: [PATCH v4,3/6] media: mtk-vcodec: Support 4GB~8GB range iova space for venc

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Date:   Fri, 21 May 2021 16:06:12 +0800
From:   Tzung-Bi Shih <tzungbi@...gle.com>
To:     Irui Wang <irui.wang@...iatek.com>
Cc:     Alexandre Courbot <acourbot@...omium.org>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        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>,
        Hsin-Yi Wang <hsinyi@...omium.org>,
        Maoguang Meng <maoguang.meng@...iatek.com>,
        Longfei Wang <longfei.wang@...iatek.com>,
        Yong Wu <yong.wu@...iatek.com>,
        Yunfei Dong <yunfei.dong@...iatek.com>,
        Fritz Koenig <frkoenig@...omium.org>,
        Tzung-Bi Shih <tzungbi@...omium.org>,
        linux-media@...r.kernel.org,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-arm-kernel@...ts.infradead.org>,
        srv_heupstream@...iatek.com,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>,
        Project_Global_Chrome_Upstream_Group@...iatek.com
Subject: Re: [PATCH v4,3/6] media: mtk-vcodec: Support 4GB~8GB range iova
 space for venc

On Fri, May 21, 2021 at 3:02 PM Irui Wang <irui.wang@...iatek.com> wrote:
> +       if (of_get_property(pdev->dev.of_node, "dma-ranges", NULL))
> +               dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(34));
> +

>From your previous dt-bindings patch[1], it has 4 banks.
> 0~4G; 4G~8G; 8G~12G; 12G~16G.

But, the code treats it as a boolean.  I.e. 0~4GB if non-existent;
otherwise, 4GB~8GB.

[1]: https://patchwork.linuxtv.org/project/linux-media/patch/20210521070139.20644-3-irui.wang@mediatek.com/