linux-kernel - Re: [PATCH] dt-bindings: arm: mediatek: mmsys: change compatible for MT8195

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Message-ID: <d5a00dc88bed1680caa8af895a1140324b9d079e.camel@mediatek.com>
Date:   Thu, 25 Aug 2022 14:59:20 +0800
From:   Bo-Chen Chen <rex-bc.chen@...iatek.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>,
        "matthias.bgg@...il.com" <matthias.bgg@...il.com>
CC:     Jason-JH Lin (林睿祥) 
        <Jason-JH.Lin@...iatek.com>,
        Nancy Lin (林欣螢) 
        <Nancy.Lin@...iatek.com>,
        "CK Hu (胡俊光)" 
        <ck.hu@...iatek.com>,
        "chunkuang.hu@...nel.org" <chunkuang.hu@...nel.org>,
        "angelogioacchino.delregno@...labora.com" 
        <angelogioacchino.delregno@...labora.com>,
        "hsinyi@...gle.com" <hsinyi@...gle.com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>,
        Project_Global_Chrome_Upstream_Group 
        <Project_Global_Chrome_Upstream_Group@...iatek.com>
Subject: Re: [PATCH] dt-bindings: arm: mediatek: mmsys: change compatible
 for MT8195

On Thu, 2022-08-25 at 14:11 +0800, Krzysztof Kozlowski wrote:
> On 25/08/2022 08:56, Bo-Chen Chen wrote:
> > From: "Jason-JH.Lin" <jason-jh.lin@...iatek.com>
> > 
> > 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.
> 
> I don't see binding to different clock drivers and anyway that's not
> really an argument here. Please focus in description on hardware
> properties, IOW, are devices compatible or different. What is the
> incompatible difference between VDOSYS0 and 1?
> 
> Best regards,
> Krzysztof

Hello Krzysztof,

Thanks for yor review.

>From the functions perspective:

Hardware pipeline of VDOSYS0 has these components: COLOR, CCORR, AAL,
GAMMA, DITHER.
They are related to PQ (Picture Quality) functions 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.

About mediatek ETHDR, you can refer to this series:

https://lore.kernel.org/all/20220819061456.8042-2-nancy.lin@mediatek.com/

To summary:
Only VDOSYS0 can support PQ adjustment.
Only VDOSYS1 can support HDR adjustment.

Is this description ok for you?
If it is ok, I will put them into commit message in next version.

BRs,
Bo-Chen