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

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Date: Thu, 22 Feb 2024 11:02:47 +0100
From: Konrad Dybcio <konrad.dybcio@...aro.org>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc: Bjorn Andersson <quic_bjorande@...cinc.com>,
 Douglas Anderson <dianders@...omium.org>, 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>,
 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 2/22/24 10:46, Dmitry Baryshkov wrote:
> On Thu, 22 Feb 2024 at 11:28, Konrad Dybcio <konrad.dybcio@...aro.org> wrote:
>>
>>
>>
>> On 2/22/24 10:04, Dmitry Baryshkov wrote:
>>> On Thu, 22 Feb 2024 at 10:56, Konrad Dybcio <konrad.dybcio@...aro.org> wrote:
>>>>
>>>>
>>>>
>>>> On 2/22/24 00:41, Dmitry Baryshkov wrote:
>>>>> 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?
>>>>
>>>> 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?

Would it not concern non-Chrome SC7280s too, then?

Konrad