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

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Date:   Fri, 16 Sep 2022 08:54:31 +0800
From:   Jason-JH Lin <jason-jh.lin@...iatek.com>
To:     Matthias Brugger <matthias.bgg@...il.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

Hi Matthias,

Thanks for the review.

On Thu, 2022-09-15 at 18:15 +0200, Matthias Brugger wrote:
> 
> 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
> 
OK, I'll remove this.

But I think this dts change should be sent after the vdosys1 series are
accepted.
So I'll drop this dts patch at the next version.

Regards,
Jason-JH.Lin

> > 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>;
> >   		};
> 
> 
-- 
Jason-JH Lin <jason-jh.lin@...iatek.com>