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[87.246.222.6]) by smtp.gmail.com with ESMTPSA id c4-20020a056512074400b00512ab928706sm1730595lfs.167.2024.02.22.02.02.49 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 22 Feb 2024 02:02:51 -0800 (PST) Message-ID: Date: Thu, 22 Feb 2024 11:02:47 +0100 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 3/9] arm64: dts: qcom: sc7280: Enable MDP turbo mode To: Dmitry Baryshkov Cc: Bjorn Andersson , Douglas Anderson , Rob Clark , Abhinav Kumar , Sean Paul , Marijn Suijten , David Airlie , Daniel Vetter , cros-qcom-dts-watchers@chromium.org, Bjorn Andersson , Rob Herring , Krzysztof Kozlowski , Conor Dooley , 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> <8313a7c3-3ace-4dee-ad27-8f51a06cd58c@linaro.org> <8fcb5816-2d59-4e27-ba68-8e0ed6e7d839@linaro.org> Content-Language: en-US From: Konrad Dybcio In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 2/22/24 10:46, Dmitry Baryshkov wrote: > On Thu, 22 Feb 2024 at 11:28, Konrad Dybcio wrote: >> >> >> >> On 2/22/24 10:04, Dmitry Baryshkov wrote: >>> On Thu, 22 Feb 2024 at 10:56, Konrad Dybcio wrote: >>>> >>>> >>>> >>>> On 2/22/24 00:41, Dmitry Baryshkov wrote: >>>>> On Thu, 22 Feb 2024 at 01:19, Bjorn Andersson 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