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 6EE173AE196 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=1775811362; cv=none; b=JO51HZFbvSHuhMngvAYAA5iL1p7ELsnrCNu0fT5tY9pmj2g+tDAMEkvv89/baZvyC02Bk0X+sbTGahDPwPnpu5JoIjz3SemJNr9hhIg68MZe4NVta/kHUjqmJYK1FWWXLVrh3/ecARw4bD5WYW86KPsks3h2BupfF7Pd6X/Km28= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775811362; 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=d4EpNy3k9WenSuEOCRg8ZA97Iy1wRxsdLiVW80OmlGnRDJZKRTh+zSMdyZlDz2sehEAcSLxFXd7ZJwqko6k7hCqraZH0eYl8U2Dw2Eg5e3euTJIqaH9K2cV6x3eIY0uZOqfDMXPMnb4CF4tX8/907Rhyq357mmHGVHhrFr0jrP8= 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 (m0279864.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.18.1.11/8.18.1.11) with ESMTP id 63A5l4YK2866291 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-f197.google.com (mail-qt1-f197.google.com [209.85.160.197]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 4decaykn22-1 (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-f197.google.com with SMTP id d75a77b69052e-5073ed1ec6fso4945381cf.1 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=RpKSIv06KMCAncLOS3QD4sMQPzfHnN35/Rfos74CAW8lni4s25XXj2WPyYkMzgPxEv AWz8rVZ+5HhIxdHB3BZXRSknkvKsBBd7ZK20wTh6pzyQ5+t3VkutlYx9fOr2nCBjvEE/ HOwIK4gVmMs9yACiHY8I1dIH/B9a59sKNJ3FiX3UpWn44LGM71Kz0Obbkr+47QH0ZO8T TTMSHA5q5cyF9+bQJtOAM2s5SXPxbP32RpovSCwI/nxR5nhPQ6EvWryEPY6mTg30wniI hXtfDIzHzOOgjJWhgvT4OFXmgpvvO0qzbdybpMPmu/KAMrmMEzPjHCTSJUfutw/26e6B vOQQ== X-Forwarded-Encrypted: i=1; AJvYcCUErNRyy2+D6dqaj9PUvRHWMG3hhLLV6AyQFWQhdAgjqTf/7UckiFtSo0gVxHU0KjhrIexDamVkBGDa5gg=@vger.kernel.org X-Gm-Message-State: AOJu0Ywx92bO88E/Ya02RTb5t4gBYMp7L68DvSl3NVFLL/MZxnPpnMbH H/p7/TbCQ+21myEPWIz352RHHaPDxbZ2j+S3cawPifVCKS6mAPnNbMF0cgGjMbMkyJT0lnSGpex yHfwdVN4nxN9dOoHuuopViwBDqLWvnTjT2VlP6IvMw/D76Rw9fsoeYCaDjzMWiEoa+qI= X-Gm-Gg: AeBDies01zVhM67LAQ66Bhs+QoivcsSwvO7K22Y1bB7aVe4snmOKMaAMA/LEI8DDcIA xu2qG5odtML53ElIvnj5mc7YOLt3zk/kwCTkMW061M0reiZqMOkO4LwzPTew3qfgw8wPrlr6VNK lNPCPvuCD8DndGoI8Q2/xFOB2mcW1rBgRq3y7no49pCkG52hfvzvY0jYlSeWiRIIDkz5U51S3Wb Kz4kTd06PPuw6AlVvy8QwyxFvwGBag2hDa0H3qFD9/l21Vf1qnuQROFddPf3f2oFzECfPr3W+tP HmHZXvDZJOciuAyYBJ6FV6T6NJHZNuxSawPf2eiIvKIb6UIxNNadgZmXyaJu9Pt5N3mW9g1Kzy1 2e2IigGxQOB0Z/Zj2tobmtNE0H3d5gyA6veyu/VnBbXNjiOjIg6+qR6h4LrdVL6WzuFN3O0zyVJ JRoWI= X-Received: by 2002:ac8:588a:0:b0:50b:2f83:b702 with SMTP id d75a77b69052e-50dd5c4f080mr22735381cf.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-kernel@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=XtnK/1F9 c=1 sm=1 tr=0 ts=69d8bb1f cx=c_pps a=EVbN6Ke/fEF3bsl7X48z0g==:117 a=FpWmc02/iXfjRdCD7H54yg==:17 a=IkcTkHD0fZMA:10 a=A5OVakUREuEA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=DJpcGTmdVt4CTyJn9g5Z:22 a=SXzkmgPmAAAA:8 a=VwQbUJbxAAAA:8 a=RZ-4Qy_TuwwZI4MMkMAA:9 a=QEXdDO2ut3YA:10 a=a_PwQJl-kcHnX1M80qC6:22 a=EWLf6cg6Bh5aS0AxDgDu:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNDEwMDA4MSBTYWx0ZWRfX4QxV57KZ0cUD Gecn4eWE9ZuIAkPvsfNLjXetLw3fwG6BKyHTFtqLTZvZH9CT845qS4T27BjJ8s0E7gRmKrWf5oP 1YMXC/lIFInYGMVS6AeYjTTPNwiohCDzWppdxgm7oXWGtnqgyIJ9hV2x+xNVj9UHaYwGpReBuly 3nVjkLP5rpEHEF1abrM9lgIl39L3lPr4+n0HQE6I+V+5YK28Fd4QTxjAc61npoUwzSFXN7J2ntm +z7J511yPQ9Gs6DlmbOehRqG6csk0HFlMVb93hQ/5E2qjwJ3Wy1n2ycI01mY7q4al6JDMiybbeL dyt0OnQFwKaqkAqKpB8htexOifU2gCU751mKuik4PUctDyNWoSnBn31OqEAXuA3J8hMKD2rGkhm JFQtit2lhcOvhtKLmGbFWkOjSU4IORGcFYCfIEXitIFNxnVCmUudX7aCpTu6iVG/qlmYxPSR2J6 1pkOHD2k4UdFzrkpp6g== X-Proofpoint-GUID: fVU-Ti-0kQIuGuwnOvWwLopD1B7J6yd6 X-Proofpoint-ORIG-GUID: fVU-Ti-0kQIuGuwnOvWwLopD1B7J6yd6 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 suspectscore=0 lowpriorityscore=0 clxscore=1015 malwarescore=0 priorityscore=1501 bulkscore=0 phishscore=0 impostorscore=0 adultscore=0 spamscore=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