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From: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Date: Thu, 22 Feb 2024 11:46:26 +0200
Message-ID: <CAA8EJporaUuddHHqpyYHiYSu=toHmrDxSHf9msZUJoym4Nz72g@mail.gmail.com>
Subject: Re: [PATCH 3/9] arm64: dts: qcom: sc7280: Enable MDP turbo mode
To: Konrad Dybcio <konrad.dybcio@linaro.org>
Cc: Bjorn Andersson <quic_bjorande@quicinc.com>, Douglas Anderson <dianders@chromium.org>, 
	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>, 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 11:28, Konrad Dybcio <konrad.dybcio@linaro.org> wrote:
>
>
>
> On 2/22/24 10:04, Dmitry Baryshkov wrote:
> > On Thu, 22 Feb 2024 at 10:56, Konrad Dybcio <konrad.dybcio@linaro.org> wrote:
> >>
> >>
> >>
> >> On 2/22/24 00:41, Dmitry Baryshkov wrote:
> >>> 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?
> >>
> >> ChromeOS devices don't get a special SoC
> >
> > But they have the sc7280-chrome-common.dtsi, which might contain a
> > corresponding /delete-node/ .
>
> What does that change? The clock rates are bound to the
> SoC and the effective values are limited by link-frequencies
> or the panel driver.

Preventing the DPU from overheating? Or spending too much power?

-- 
With best wishes
Dmitry