linux-kernel - Re: [PATCH 3/9] arm64: dts: qcom: sc7280: Enable MDP turbo mode

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Date: Thu, 22 Feb 2024 01:41:11 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Bjorn Andersson <quic_bjorande@...cinc.com>, Douglas Anderson <dianders@...omium.org>
Cc: Rob Clark <robdclark@...il.com>, Abhinav Kumar <quic_abhinavk@...cinc.com>, 
	Sean Paul <sean@...rly.run>, Marijn Suijten <marijn.suijten@...ainline.org>, 
	David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>, cros-qcom-dts-watchers@...omium.org, 
	Bjorn Andersson <andersson@...nel.org>, Konrad Dybcio <konrad.dybcio@...aro.org>, 
	Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, 
	Conor Dooley <conor+dt@...nel.org>, linux-arm-msm@...r.kernel.org, 
	dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org, 
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH 3/9] arm64: dts: qcom: sc7280: Enable MDP turbo mode

On Thu, 22 Feb 2024 at 01:19, Bjorn Andersson <quic_bjorande@...cinc.com> wrote:
>
> The max frequency listed in the DPU opp-table is 506MHz, this is not
> sufficient to drive a 4k@60 display, resulting in constant underrun.
>
> Add the missing MDP_CLK turbo frequency of 608MHz to the opp-table to
> fix this.

I think we might want to keep this disabled for ChromeOS devices. Doug?

>
> Signed-off-by: Bjorn Andersson <quic_bjorande@...cinc.com>
> ---
>  arch/arm64/boot/dts/qcom/sc7280.dtsi | 5 +++++
>  1 file changed, 5 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/qcom/sc7280.dtsi b/arch/arm64/boot/dts/qcom/sc7280.dtsi
> index a19c278ebec9..a2a6717c6c87 100644
> --- a/arch/arm64/boot/dts/qcom/sc7280.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sc7280.dtsi
> @@ -4417,6 +4417,11 @@ opp-506666667 {
>                                                 opp-hz = /bits/ 64 <506666667>;
>                                                 required-opps = <&rpmhpd_opp_nom>;
>                                         };
> +
> +                                       opp-608000000 {
> +                                               opp-hz = /bits/ 64 <608000000>;
> +                                               required-opps = <&rpmhpd_opp_turbo>;
> +                                       };
>                                 };
>                         };
>
>
> --
> 2.25.1
>


-- 
With best wishes
Dmitry