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Message-ID: <8fcb5816-2d59-4e27-ba68-8e0ed6e7d839@linaro.org>
Date: Thu, 22 Feb 2024 10:28:19 +0100
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Subject: Re: [PATCH 3/9] arm64: dts: qcom: sc7280: Enable MDP turbo mode
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To: Dmitry Baryshkov <dmitry.baryshkov@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
References: <20240221-rb3gen2-dp-connector-v1-0-dc0964ef7d96@quicinc.com>
 <20240221-rb3gen2-dp-connector-v1-3-dc0964ef7d96@quicinc.com>
 <CAA8EJpo=9vhM+5YzaFxUoYRuEWQyrMS8wLNPSF3K=bN5JwWyDw@mail.gmail.com>
 <8313a7c3-3ace-4dee-ad27-8f51a06cd58c@linaro.org>
 <CAA8EJpqFj5nf8d_=Uoup7qg+nQrxqQU-DHbL3uSP138m9AcXLw@mail.gmail.com>
From: Konrad Dybcio <konrad.dybcio@linaro.org>
In-Reply-To: <CAA8EJpqFj5nf8d_=Uoup7qg+nQrxqQU-DHbL3uSP138m9AcXLw@mail.gmail.com>
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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.

Konrad