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From: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Date: Thu, 22 Feb 2024 01:41:11 +0200
Message-ID: <CAA8EJpo=9vhM+5YzaFxUoYRuEWQyrMS8wLNPSF3K=bN5JwWyDw@mail.gmail.com>
Subject: Re: [PATCH 3/9] arm64: dts: qcom: sc7280: Enable MDP turbo mode
To: Bjorn Andersson <quic_bjorande@quicinc.com>, Douglas Anderson <dianders@chromium.org>
Cc: Rob Clark <robdclark@gmail.com>, Abhinav Kumar <quic_abhinavk@quicinc.com>, 
	Sean Paul <sean@poorly.run>, Marijn Suijten <marijn.suijten@somainline.org>, 
	David Airlie <airlied@gmail.com>, Daniel Vetter <daniel@ffwll.ch>, cros-qcom-dts-watchers@chromium.org, 
	Bjorn Andersson <andersson@kernel.org>, Konrad Dybcio <konrad.dybcio@linaro.org>, 
	Rob Herring <robh@kernel.org>, Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>, 
	Conor Dooley <conor+dt@kernel.org>, linux-arm-msm@vger.kernel.org, 
	dri-devel@lists.freedesktop.org, freedreno@lists.freedesktop.org, 
	linux-kernel@vger.kernel.org, devicetree@vger.kernel.org
Content-Type: text/plain; charset="UTF-8"

On Thu, 22 Feb 2024 at 01:19, Bjorn Andersson <quic_bjorande@quicinc.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@quicinc.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