linux-kernel - Re: [PATCH v2, 3/5] Revert "dt-bindings: mailbox: mtk-gce: fix incorrect mbox-cells value"

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Date:   Wed, 14 Apr 2021 07:38:13 +0800
From:   Chun-Kuang Hu <chunkuang.hu@...nel.org>
To:     Yongqiang Niu <yongqiang.niu@...iatek.com>
Cc:     Chun-Kuang Hu <chunkuang.hu@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Jassi Brar <jassisinghbrar@...il.com>,
        Fabien Parent <fparent@...libre.com>,
        Dennis YC Hsieh <dennis-yc.hsieh@...iatek.com>,
        DTML <devicetree@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        DRI Development <dri-devel@...ts.freedesktop.org>,
        Project_Global_Chrome_Upstream_Group@...iatek.com
Subject: Re: [PATCH v2, 3/5] Revert "dt-bindings: mailbox: mtk-gce: fix
 incorrect mbox-cells value"

Hi, Yongqiang:

Yongqiang Niu <yongqiang.niu@...iatek.com> 於 2021年4月12日 週一 下午7:19寫道：
>
> This reverts commit f83b03fc727ab56a77e68713d6e40299698f3c9f.
>
> Signed-off-by: Yongqiang Niu <yongqiang.niu@...iatek.com>
> ---
>  Documentation/devicetree/bindings/mailbox/mtk-gce.txt | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/Documentation/devicetree/bindings/mailbox/mtk-gce.txt b/Documentation/devicetree/bindings/mailbox/mtk-gce.txt
> index 7771eca..cf48cd8 100644
> --- a/Documentation/devicetree/bindings/mailbox/mtk-gce.txt
> +++ b/Documentation/devicetree/bindings/mailbox/mtk-gce.txt
> @@ -47,7 +47,7 @@ Example:
>                 interrupts = <GIC_SPI 135 IRQ_TYPE_LEVEL_LOW>;
>                 clocks = <&infracfg CLK_INFRA_GCE>;
>                 clock-names = "gce";
> -               #mbox-cells = <2>;
> +               #mbox-cells = <3>;

I think we should not change the binding just to fix software bug.
I think there are many temporary solution to fix drm bug. If drm bug
is caused by cursor plane, you could temporarily let drm not support
cursor plane to fix it (in [1], do not return DRM_PLANE_TYPE_CURSOR).
But I would like you to find out the correct solution rather than a
temporary solution because this bug is not so urgent. (For me, bug of
build fail, boot fail, black screen is urgent).

[1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/gpu/drm/mediatek/mtk_drm_crtc.c?h=v5.12-rc7#n699

Regards,
Chun-Kuang.

>         };
>
>  Example for a client device:
> --
> 1.8.1.1.dirty
>