From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from ixit.cz (ixit.cz [185.100.197.86]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id BEBF03090C6; Sun, 12 Apr 2026 09:03:50 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.100.197.86 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775984632; cv=none; b=QrWiwbF9YeKvRx2PdGSCZLkFUdGWfpJzK+XQ7AREZIvJBISUN+pE+zyx+iX8UMGbWWFEMWsoIQwpbd1wQntKp7kBN+0U+xhNVcPDdrxu6r1k8APAhIwea6HcnHy4tAGwNu4JihTgYRnW/CQ/rr5W3MAl89CpDjDC18YHRw2p94g= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775984632; c=relaxed/simple; bh=Xmy4d5xjiDT4473uWjIPnq8qgVHL+ZKkYIwOonQsUtE=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=PwVRzstot/F1MA2qm+TfnlKMEIAb2s2ks1TQmwhAqruX8DQTigha3Mb7e1SGSRpmRl6nR6/isPEQfmHshSXfxKHl/yDYg3pBMmqx4W0uSYBkJ/bGcKsr0YwSI50eCrjCwGM6MBy9UbSlvPw9TrsJNme2p757lMLo56QTTspav20= ARC-Authentication-Results:i=1; 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bh=VeAipJqFx7qYaRN7vtzwspojaBhHa6oPoBUdHoe//DI=; b=MAeakZoH6WzZti3NQPsYAZgmx1/8+KBZus6phk8O2OyniZsu521ixvsOVJqZ5B2aBS9pVv mG42QQe/cuGPf3wkEuJGT/cMZ/1gIpZOU7zS6Mjdox/ZCtwksPzI9XHum63hBJ7IBOk0jX NlQ9ntzdhINbFEO6/2Lbcs9oCToS2to= Message-ID: Date: Sun, 12 Apr 2026 11:03:40 +0200 Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 5/5] arm64: dts: qcom: sdm845-xiaomi-beryllium-tianma: Disable MDSS To: Dmitry Baryshkov Cc: Bjorn Andersson , Konrad Dybcio , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Sam Day , linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, phone-devel@vger.kernel.org, Petr Hodina References: <20260317-beryllium-fb-v2-0-36b69dfb760c@ixit.cz> <20260317-beryllium-fb-v2-5-36b69dfb760c@ixit.cz> <73fyiqoxxg2gg5244wkukepdfw6lnguq63si22qsx2ueyna4hu@l4vyykvn43oo> 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 12/04/2026 02:36, Dmitry Baryshkov wrote: > On Fri, Apr 10, 2026 at 03:51:12PM +0200, David Heidelberg wrote: >> On 18/03/2026 15:47, Dmitry Baryshkov wrote: >>> On Tue, Mar 17, 2026 at 11:12:35PM +0100, David Heidelberg via B4 Relay wrote: >>>> From: Petr Hodina >>>> >>>> Currently the panel driver for tianma is broken. >>>> Disable MDSS to prevent DRM taking over the framebuffer. >>> >>> I'd still hope that somebody can get it to work. I'd start by using >>> prepare_prev_first. Sumit reported the panel as working in 2020 and I >>> have no doubts that it was the case. Another option migt be something >>> related to the dispcc (see my [1]). >> >> Sadly, the prepare_prev_first didn't solve the issue. The framebuffer -> >> MDSS takover happens, but at greetd (login) loading screen goes black and >> never restores. >> >> Will need more work. > > Do you see a console _while_ it boots, after the handover? I'd check the > mode programming. Maybe, disabling panel reset would also (temporarily) > help. When I get access to the phone for longer period of time I'll try to debug it step by step. This time I had only time to flash kernel and test if it boots with prepare_prev_first. David > >> >> David> >>> [1] https://lore.kernel.org/linux-arm-msm/20260217-sdm845-hdk-v1-1-866f1965fef7@oss.qualcomm.com/ > -- David Heidelberg