From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx0a-0031df01.pphosted.com (mx0a-0031df01.pphosted.com [205.220.168.131]) (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 6EEAB3AF664 for ; Fri, 10 Apr 2026 08:56:00 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=205.220.168.131 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775811361; cv=none; b=ikahWr8dzvue8CGQwA+7/cpJ0xtU0KG0KzRUK4o3G9d6P7jhKzsiMl6aSKQa+oDwHmJZ3n9oKlIH47GmO8kurSBVVFJVxy8BOQXd0jNnVVlozucTkzDS1VoYLG/ABj07YUV1kWQbX9FdLYHFigOnI/JcdNsYEJrz8Dlx8gUh1+8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775811361; c=relaxed/simple; bh=GWFjobN/z+q+q6VAzTn83X8tsx2TENHTLcoPabSCniM=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=MPcf35uiU/vgzm+He1GabgaChexH7ViV8K+FM1fD1PE5qg0mgWoYVend9KTBn1TeEfRZ1o+uN1OJmpGQ09Z9RhZTqPmYA30MFnj30TrOTJkXw6vS1C6BjX+h+Noz8vWPGOwWSjzteHRumHDYUQu7Ys698cgJAeLdvavMp7vKiTU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=oss.qualcomm.com; spf=pass smtp.mailfrom=oss.qualcomm.com; dkim=pass (2048-bit key) header.d=qualcomm.com header.i=@qualcomm.com header.b=l1lQV9aA; dkim=pass (2048-bit key) header.d=oss.qualcomm.com header.i=@oss.qualcomm.com header.b=IieUhSIP; arc=none smtp.client-ip=205.220.168.131 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=oss.qualcomm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=oss.qualcomm.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=qualcomm.com header.i=@qualcomm.com header.b="l1lQV9aA"; dkim=pass (2048-bit key) header.d=oss.qualcomm.com header.i=@oss.qualcomm.com header.b="IieUhSIP" Received: from pps.filterd (m0279862.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.18.1.11/8.18.1.11) with ESMTP id 63A5oLSh1925369 for ; Fri, 10 Apr 2026 08:55:59 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=qualcomm.com; h= cc:content-transfer-encoding:content-type:date:from:in-reply-to :message-id:mime-version:references:subject:to; s=qcppdkim1; bh= wNlvcLiFn3EPDBnTEP3/OD9nrYq1rMilcUmKdwmcd2s=; b=l1lQV9aAAZB5IWPm XPASMvqTU24RYFa7av3+0/B4pKhbqKvF5EZ/80VStWKbf6Cc+mTM1qLGfzzseZMs j6p35k0fZSw8d+SBjB0+FMUqTDWMxPfAgEGLxyYkl0jMfbjKjCHNsAWj1i0k6N5g Bs06LR0v8PuvhTfo3RklyARL4gRSOaJHsBY4MTeAOQkNx4dTfZCEC1TOAnCdoDhE mn6dS9khgo2pdGqhw9eASbrtpw+Bp6CkQgpaiLr+9uisa6k/725ZcwWhUDE20itZ kY9zOerW+/gFLLg2DKHtqphkiv5oWITixNzVidn25dC758H12bAhxAgmsbABtZ0Z nSoFCQ== Received: from mail-qt1-f198.google.com (mail-qt1-f198.google.com [209.85.160.198]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 4deudjrn7n-1 (version=TLSv1.3 cipher=TLS_AES_128_GCM_SHA256 bits=128 verify=NOT) for ; Fri, 10 Apr 2026 08:55:59 +0000 (GMT) Received: by mail-qt1-f198.google.com with SMTP id d75a77b69052e-50d7128e038so4623971cf.2 for ; Fri, 10 Apr 2026 01:55:59 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oss.qualcomm.com; s=google; t=1775811358; x=1776416158; darn=vger.kernel.org; h=content-transfer-encoding:in-reply-to:from:content-language :references:cc:to:subject:user-agent:mime-version:date:message-id :from:to:cc:subject:date:message-id:reply-to; bh=wNlvcLiFn3EPDBnTEP3/OD9nrYq1rMilcUmKdwmcd2s=; b=IieUhSIPeHdUE3/NKoKFkUMr+cTrl73YBedtmy86PWwvqSdORmrWt476kEPVn3KJDl CbtcbM4zOYU5FHgHzW2NFbgn70jMf8xFJzhSNWnV/4zLsSsjtDBbn5C5684GtvQB0C2J T7xEI1kk2KwtmuIeAJxApSS3wSR/ekFxsCaxTS+HcxHmcHV37+yn0+mG2GZpBpFAKrjK jhXOEdv4eXQCnIqxIbXIagL0kFhkCNIyZKQ9fPhcKwIrFFDIzoFow2A6hWY5ljLwpmKV J3LaWrZPm9XiO8TOTKVUm77TE5iKkNyaNxHqeoxWzrIB0egvBpW4Buw7JHmrJc8BkCX/ 99uA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1775811358; x=1776416158; h=content-transfer-encoding:in-reply-to:from:content-language :references:cc:to:subject:user-agent:mime-version:date:message-id :x-gm-gg:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=wNlvcLiFn3EPDBnTEP3/OD9nrYq1rMilcUmKdwmcd2s=; b=UrvxQzCnjg1TfsFNG3TrwVfhNL8SJBc/P2ZRfgFP7285J+c64psBejHFLGjsoufQ14 mi6igV7+BiWrhM7crciB6XevvtkHeepgY7daqlR4ypelDrnS/WKIJcvWn8nGF7Epci8o gay3zDdMUQdfbqgcfVByRqCBMhOlCVf+ZKhzpYt8MVZ1kcd6W+YSBf7Bz3rcL2n1Kj+P 1UJMCrS8IfVQFwqy6EJ06KluA9F+1omlwytLXX7Z+2w2R1xoDVngP5svCRO7fRMo1hlr 0jGJ1+wz5/9veGh6LLhioHmqN1ZhyGNkESjei+z2ZJSRfrwJybXyS/aQ4NTFG6QRyDeC 9M0Q== X-Forwarded-Encrypted: i=1; AJvYcCWsoqqpy/t25Sws8tvYggw9FW8vF8ONMmAxvR/zQ2cY7rEok46FxQ5l9Fuo/390WgSjmK9sDxPxLao=@vger.kernel.org X-Gm-Message-State: AOJu0YwRIn8DaPbTD0Ox9yXGVTDael+la6gI1HxEIvE6g/Ypk5cCqzlH vBa2jQhRK697AkMIQVnVaWR198kUspyJ6yQfJauzos8dgPpuRcu6uRZKYBE3dv9IQsoLzoYF9UZ 7mqx/pmKxumrIVkEHpIVYXPRctw0OYvZNHgdJZtPQuAzGpKtZbHC/sAiDLUI7bsc= X-Gm-Gg: AeBDieuu5iFbfyNBcXWs61spwfA3GvYg05w2A9d1MK2Ta8H9SMCh/utIEYJKCHzbJ6A lee4LLkKGN2VtD1Z+PUooocV9WAgSIxe9L2mKgxluAjJS9yqHoVmV0t3JkFUo0UV2Tph6g9FtuO qgT0fKnesRuQMXWc+pFl4yBJEosBHHS9tjiMF86PuRucl5oAM7IoAkn3NL4DlAzveQ/9SmHDP/c qaqDKtOFCF4Ete0NOzNwZqnJOtwhifJdOX/MW6k7aQrrdyUCrReM/KB31Hnl52DojbmmjruXmOk uR31RySvBDeZI5GG8K57eh+Pm1fY6mMjLPhNzbuPGdVLlae5XelZ+Llc93kZMO8Ub58hHdlJfsO lYOq7fpDPl2/cCMw9OUnxsZPYY3BfaY/vyj+Oxvl7ELi+YAkuJsHGvKbXc7wtIqjJ1kNpon+BE8 b7wDE= X-Received: by 2002:ac8:588a:0:b0:50b:2f83:b702 with SMTP id d75a77b69052e-50dd5c4f080mr22735371cf.6.1775811358542; Fri, 10 Apr 2026 01:55:58 -0700 (PDT) X-Received: by 2002:ac8:588a:0:b0:50b:2f83:b702 with SMTP id d75a77b69052e-50dd5c4f080mr22735201cf.6.1775811358089; Fri, 10 Apr 2026 01:55:58 -0700 (PDT) Received: from [192.168.119.254] (078088045245.garwolin.vectranet.pl. [78.88.45.245]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-67070815a1dsm443649a12.22.2026.04.10.01.55.54 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 10 Apr 2026 01:55:57 -0700 (PDT) Message-ID: <5b45a40d-54a6-40b5-b4b6-eac344827dc9@oss.qualcomm.com> Date: Fri, 10 Apr 2026 10:55:53 +0200 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 , David Heidelberg Cc: 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> <9405b67b-9e08-472d-a937-38c038fdf73a@oss.qualcomm.com> <9b4cb352-d1ed-402d-a55d-cce2d2fe1eed@oss.qualcomm.com> <8cd9693d-9ec0-4173-bcca-786915b5c4cc@ixit.cz> Content-Language: en-US From: Konrad Dybcio In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Authority-Analysis: v=2.4 cv=X+hi7mTe c=1 sm=1 tr=0 ts=69d8bb1f cx=c_pps a=mPf7EqFMSY9/WdsSgAYMbA==:117 a=FpWmc02/iXfjRdCD7H54yg==:17 a=IkcTkHD0fZMA:10 a=A5OVakUREuEA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=_K5XuSEh1TEqbUxoQ0s3:22 a=SXzkmgPmAAAA:8 a=VwQbUJbxAAAA:8 a=RZ-4Qy_TuwwZI4MMkMAA:9 a=QEXdDO2ut3YA:10 a=dawVfQjAaf238kedN5IG:22 a=EWLf6cg6Bh5aS0AxDgDu:22 X-Proofpoint-GUID: sx8tVCCRpbEgonUVmm5vurvhvrBU4GfG X-Proofpoint-ORIG-GUID: sx8tVCCRpbEgonUVmm5vurvhvrBU4GfG X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNDEwMDA4MSBTYWx0ZWRfX6+uRLlMIJLr9 9WUNxvl2wnoXUhHpUXxbNHYQmPmxuuUMjvuqcDxWXTCx0fb0UaWN6S6pryPdH2CyWAICTubPg9w Mz4v+IEpUMn4osP3hpzt4KCIvS4vYuOxj+2WkpuLuthxqhD8aBrdqAZgJwpHJjcOGD+yxSeVi3N fR0VZSdQMkll85jMoBNUWqPTk1cLysTIjPgoFQ+8yn0p8GZWFdMRspHjBfi0B4XEp04V84hOaai 3rKTqwBE44YyVBRhpabW6qmBRtxi4rYWKvgAuC8kNGD2qSQkr6fuUs9UGtfZMrtG37SUPyfoKJ+ o2cFeUyhSwSBl41HAr1TnkEwSgCFoLtS2pqlOwVC+C0Zi69kXEFtIdO577yH4wNVhPN48VWQeFj ZlvQLY9PK9QwNbvlILCf51V4WhGHA0TmX2/rKBRLCITPoc5f60M1A3rZ7KW5KtgUEKEWsumImsG Q0Mwt8KUrGufvPBHWJg== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-04-10_02,2026-04-09_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 malwarescore=0 clxscore=1015 adultscore=0 priorityscore=1501 lowpriorityscore=0 suspectscore=0 spamscore=0 bulkscore=0 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2604010000 definitions=main-2604100081 On 4/9/26 11:24 PM, Dmitry Baryshkov wrote: > On Thu, Apr 09, 2026 at 10:38:15PM +0200, David Heidelberg wrote: >> On 18/02/2026 16:59, Dmitry Baryshkov wrote: >>> On Wed, Feb 18, 2026 at 03:28:01PM +0100, Konrad Dybcio wrote: >>>> >>>> >>>> On 18-Feb-26 12:58, Dmitry Baryshkov wrote: >>>>> On Wed, Feb 18, 2026 at 12:24:26PM +0100, Konrad Dybcio wrote: >>>>>> On 2/18/26 12:18 PM, 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]. >>>>>>> >>>>>>> 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/ >>>>>> >>>>>> Please don't alter the contents of dt-bindings, it really doesn't matter >>>>>> if on sdm845 it's reset0 or reset1, that's why we define them in the first >>>>>> place >>>>> >>>>> I dpn't think that will pass. Current reset is defined as RSCC, we can't >>>>> change that to CORE behind the scene. I'd prefer David's approach. >>>> >>>> Back when I replied, David had a patch that removed the current RSCC >>>> reset definition in dt-bindings (at index 0) and re-used that index >>>> for CORE, putting RSCC at index 1. Perhaps it's better to link to >>>> specific commits when making comments, note to self :P >>> >>> Yes, I saw the commit having two resets. Anyway, as we saw, it doesn't >>> work. >> >> So, finally I spent "so much effort" (read throwing it at LLM) looking at: >> >> arm-smmu 15000000.iommu: Unhandled context fault: fsr=0x402, >> iova=0x9d4bb500, fsynr=0x170021, cbfrsynra=0xc88, cb=11 >> arm-smmu 15000000.iommu: FSR = 00000402 [Format=2 TF], SID=0xc88 >> arm-smmu 15000000.iommu: FSYNR0 = 00170021 [S1CBNDX=23 PNU PLVL=1] > > [...] > >> >> These (or very similar warnings) are around sdm845 definitely 6.19+ / >> linux-next kernels for some time, but pretty harmless. >> >> LLM suggested multiple fixes, but when presenting possibility of >> implementing mdss reset it found it as most preferable [1]. >> >> Adding MDSS reset would most likely solve it. It's not critical, but not >> nice to see many red lines in the dmesg. >> >> Is there something I could experiment with to get closer to have proper MDSS reset? > > I don't have a sensible solution at this point. We tried using the MDSS > reset on several SDM845 devices, but they just reset. So... I don't have > any possible solution. The older context talks about altering the existing dt-bindings values and now we're at hardware (mis)behaving? What is the issue here? Konrad