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bh=VOOo4qimvzuaNrtRLJw1grh5KPdzyRw4MzBD2N8q7+s=; b=A0H+T9RoVNxutcy67G5oqwYwRs4d7L1dsoj8EL/4MKoCbR8AbHKzB19xwB1r/GThRItwS0 gpkhV/86hnR32KwsHyHIjrJabf4EYlehh2C34o3tmZRLHwc+eFZh4dpP4Jmhn1PIVSid9H qygav8MQFFTcb1Q8mGlAjZh8NRNFVHA= Message-ID: <712c3466-e5ba-4c42-8068-fb9750326f31@ixit.cz> Date: Wed, 18 Feb 2026 13:21:05 +0100 Precedence: bulk X-Mailing-List: linux-clk@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 3/4] arm64: dts: qcom: sdm845: Add missing MDSS reset To: Dmitry Baryshkov Cc: Konrad Dybcio , Bjorn Andersson , Michael Turquette , Stephen Boyd , Ulf Hansson , Konrad Dybcio , Rob Herring , Krzysztof Kozlowski , Conor Dooley , linux-arm-msm@vger.kernel.org, linux-clk@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org References: <20260217-sdm845-hdk-v1-0-866f1965fef7@oss.qualcomm.com> <20260217-sdm845-hdk-v1-3-866f1965fef7@oss.qualcomm.com> <590f75c2-6418-4d39-ba7e-589acdf98786@oss.qualcomm.com> Content-Language: en-US From: David Heidelberg Autocrypt: addr=david@ixit.cz; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 18/02/2026 13:19, Dmitry Baryshkov wrote: > On Wed, Feb 18, 2026 at 12:18:39PM +0100, David Heidelberg wrote: >> On 18/02/2026 11:30, Konrad Dybcio wrote: >>> On 2/17/26 10:20 PM, Dmitry Baryshkov wrote: >>>> From: David Heidelberg >>>> >>>> If the OS does not support recovering the state left by the >>>> bootloader it needs a way to reset display hardware, so that it can >>>> start from a clean state. Add a reference to the relevant reset. >>> >>> This is not the relevant reset >>> >>> You want MDSS_CORE_BCR @ 0xaf0_2000 >> >> Thanks, I prepared the fixes [1]. > > UPD: touching that register resets the device. So, it seems, we will > have to live without the MDSS Core reset of SDM845. For me, so far, one test on Pixel 3 it freezes the device. Haven't found UART dongle, so not sure where exactly. David > >> >> I'll try to test it if it's not breaking anything for us and send as v2 of >> [2]. >> >> David >> >> [1] https://codeberg.org/sdm845/linux/commits/branch/b4/mdss-reset >> [2] https://patchwork.kernel.org/project/linux-arm-msm/patch/20260112-mdss-reset-v1-1-af7c572204d3@ixit.cz/ >> >>> >>> Konrad >>> >>>> >>>> Signed-off-by: David Heidelberg >>>> Signed-off-by: Dmitry Baryshkov >>>> --- >>> >>> >>>> arch/arm64/boot/dts/qcom/sdm845.dtsi | 1 + >>>> 1 file changed, 1 insertion(+) >>>> >>>> diff --git a/arch/arm64/boot/dts/qcom/sdm845.dtsi b/arch/arm64/boot/dts/qcom/sdm845.dtsi >>>> index bf2f9c04adba..75c192eddc57 100644 >>>> --- a/arch/arm64/boot/dts/qcom/sdm845.dtsi >>>> +++ b/arch/arm64/boot/dts/qcom/sdm845.dtsi >>>> @@ -4550,6 +4550,7 @@ mdss: display-subsystem@ae00000 { >>>> reg-names = "mdss"; >>>> power-domains = <&dispcc MDSS_GDSC>; >>>> + resets = <&dispcc DISP_CC_MDSS_RSCC_BCR>; >>>> clocks = <&dispcc DISP_CC_MDSS_AHB_CLK>, >>>> <&dispcc DISP_CC_MDSS_MDP_CLK>; >>>> >> >> -- >> David Heidelberg >> > -- David Heidelberg