linux-kernel - Re: [PATCH 4/5] arm64: dts: change compatible of vdosys0 and vdosys1 for mt8195

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Date:   Thu, 15 Sep 2022 18:15:04 +0200
From:   Matthias Brugger <matthias.bgg@...il.com>
To:     "Jason-JH.Lin" <jason-jh.lin@...iatek.com>,
        Chun-Kuang Hu <chunkuang.hu@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
Cc:     CK Hu <ck.hu@...iatek.com>, Rex-BC Chen <rex-bc.chen@...iatek.com>,
        Singo Chang <singo.chang@...iatek.com>,
        Nancy Lin <nancy.lin@...iatek.com>,
        dri-devel@...ts.freedesktop.org,
        linux-mediatek@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Project_Global_Chrome_Upstream_Group@...iatek.com
Subject: Re: [PATCH 4/5] arm64: dts: change compatible of vdosys0 and vdosys1
 for mt8195



On 14/09/2022 20:23, Jason-JH.Lin wrote:
> For previous MediaTek SoCs, such as MT8173, there are 2 display HW
> pipelines binding to 1 mmsys with the same power domain, the same
> clock driver and the same mediatek-drm driver.
> 
> For MT8195, VDOSYS0 and VDOSYS1 are 2 display HW pipelines binding to
> 2 different power domains, different clock drivers and different
> mediatek-drm drivers.
> 
> Moreover, Hardware pipeline of VDOSYS0 has these components: COLOR,
> CCORR, AAL, GAMMA, DITHER. They are related to the PQ (Picture Quality)
> and they makes VDOSYS0 supports PQ function while they are not
> including in VDOSYS1.
> 
> Hardware pipeline of VDOSYS1 has the component ETHDR (HDR related
> component). It makes VDOSYS1 supports the HDR function while it's not
> including in VDOSYS0.
> 
> To summarize0:
> Only VDOSYS0 can support PQ adjustment.
> Only VDOSYS1 can support HDR adjustment.
> 
> Therefore, we need to separate these two different mmsys hardwares to
> 2 different compatibles for MT8195.
> 
> Fixes: b852ee68fd72 ("arm64: dts: mt8195: Add display node for vdosys0")

No fixes tag needed, there is no runtime bug.

Regards,
Matthias

> Signed-off-by: Jason-JH.Lin <jason-jh.lin@...iatek.com>
> ---
>   arch/arm64/boot/dts/mediatek/mt8195.dtsi | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/mediatek/mt8195.dtsi b/arch/arm64/boot/dts/mediatek/mt8195.dtsi
> index 905d1a90b406..6ec6d59a16ec 100644
> --- a/arch/arm64/boot/dts/mediatek/mt8195.dtsi
> +++ b/arch/arm64/boot/dts/mediatek/mt8195.dtsi
> @@ -1966,7 +1966,7 @@
>   		};
>   
>   		vdosys0: syscon@...1a000 {
> -			compatible = "mediatek,mt8195-mmsys", "syscon";
> +			compatible = "mediatek,mt8195-vdosys0", "syscon";
>   			reg = <0 0x1c01a000 0 0x1000>;
>   			mboxes = <&gce0 0 CMDQ_THR_PRIO_4>;
>   			#clock-cells = <1>;
> @@ -2101,7 +2101,7 @@
>   		};
>   
>   		vdosys1: syscon@...00000 {
> -			compatible = "mediatek,mt8195-mmsys", "syscon";
> +			compatible = "mediatek,mt8195-vdosys1", "syscon";
>   			reg = <0 0x1c100000 0 0x1000>;
>   			#clock-cells = <1>;
>   		};