linux-kernel - Re: [PATCH RFC 3/3] arm64: dts: qcom: x1e80100: Add ACD levels for GPU

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Message-ID: <20241015193540.mcpp2dvkmikruncj@hu-akhilpo-hyd.qualcomm.com>
Date: Wed, 16 Oct 2024 01:05:40 +0530
From: Akhil P Oommen <quic_akhilpo@...cinc.com>
To: Krzysztof Kozlowski <krzk@...nel.org>
CC: Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>,
        "Konrad
 Dybcio" <konradybcio@...nel.org>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Marijn Suijten
	<marijn.suijten@...ainline.org>,
        David Airlie <airlied@...il.com>, "Simona
 Vetter" <simona@...ll.ch>,
        Viresh Kumar <vireshk@...nel.org>, Nishanth Menon
	<nm@...com>,
        Stephen Boyd <sboyd@...nel.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        <linux-arm-msm@...r.kernel.org>, <dri-devel@...ts.freedesktop.org>,
        <freedreno@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>,
        <linux-pm@...r.kernel.org>, <devicetree@...r.kernel.org>
Subject: Re: [PATCH RFC 3/3] arm64: dts: qcom: x1e80100: Add ACD levels for
 GPU

On Mon, Oct 14, 2024 at 09:40:13AM +0200, Krzysztof Kozlowski wrote:
> On Sat, Oct 12, 2024 at 01:59:30AM +0530, Akhil P Oommen wrote:
> > Update GPU node to include acd level values.
> > 
> > Signed-off-by: Akhil P Oommen <quic_akhilpo@...cinc.com>
> > ---
> >  arch/arm64/boot/dts/qcom/x1e80100.dtsi | 11 ++++++++++-
> >  1 file changed, 10 insertions(+), 1 deletion(-)
> > 
> > diff --git a/arch/arm64/boot/dts/qcom/x1e80100.dtsi b/arch/arm64/boot/dts/qcom/x1e80100.dtsi
> > index a36076e3c56b..e6c500480eb1 100644
> > --- a/arch/arm64/boot/dts/qcom/x1e80100.dtsi
> > +++ b/arch/arm64/boot/dts/qcom/x1e80100.dtsi
> > @@ -3323,60 +3323,69 @@ zap-shader {
> >  			};
> >  
> >  			gpu_opp_table: opp-table {
> > -				compatible = "operating-points-v2";
> > +				compatible = "operating-points-v2-adreno";
> 
> This nicely breaks all existing users of this DTS. Sorry, no. We are way
> past initial bringup/development. One year past.

It is not obvious to me how it breaks backward compatibility. Could you
please elaborate a bit? I am aware that drivers should be backward
compatible with DT, but not the other way. Are we talking about kernels other
than Linux?

Also, does including "operating-points-v2" too here help?

-Akhil.

> 
> Best regards,
> Krzysztof
>