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[78.88.45.245]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-b9d6dfd88c9sm308377666b.23.2026.04.13.03.28.58 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 13 Apr 2026 03:28:59 -0700 (PDT) Message-ID: Date: Mon, 13 Apr 2026 12:28:57 +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 3/4] arm64: dts: qcom: sdm845: Add missing MDSS reset To: Dmitry Baryshkov Cc: David Heidelberg , 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-v1-3-866f1965fef7@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> <5b45a40d-54a6-40b5-b4b6-eac344827dc9@oss.qualcomm.com> 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=RYWgzVtv c=1 sm=1 tr=0 ts=69dcc56d cx=c_pps a=JbAStetqSzwMeJznSMzCyw==:117 a=FpWmc02/iXfjRdCD7H54yg==:17 a=IkcTkHD0fZMA:10 a=A5OVakUREuEA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=ZpdpYltYx_vBUK5n70dp:22 a=SXzkmgPmAAAA:8 a=VwQbUJbxAAAA:8 a=GlKLo3LhAl51aJ-GqygA:9 a=QEXdDO2ut3YA:10 a=uxP6HrT_eTzRwkO_Te1X:22 a=EWLf6cg6Bh5aS0AxDgDu:22 X-Proofpoint-GUID: 7EG9uh-5i5Apo_8JQWpuwNP9Zh5b3kGN X-Proofpoint-ORIG-GUID: 7EG9uh-5i5Apo_8JQWpuwNP9Zh5b3kGN X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNDEzMDEwMyBTYWx0ZWRfX02GKNo2ip5Rx jNZxI0W9jFEBupHjCiCDgFmQGp8UB6VMEMFx76OK5IwFNKId5335yCHoKiIIUYjHK4NM1jzEiPw ElUtY8LXAyxCZRJ5wO2rOw2UV9/eiCNH5mK2Y0pgOMcDqrNi9DnJoyhf1F4FGilvPLsBBV2g1gI bRW/9OawNrtzYUi+1+3yjvSzdHvhqqUv1IYlUlbSAYz9t4szgqyLzEMa0MmuhPB9yILdfAgZYw5 3l/ALW9y2Y6sdCEVak4RsYW5TwotkXTnLn0+guniXcYPGj0MgZDsIFgpPzV1HQUplp/t0FQpNgo Rj7TpeQMGZ0hTMyYbfLDw2bd2a2Je4dQLwc3TPPWgbz0ZXuHEqBP4Emk7nGbbFeHxnaWgo2yU9F TYs+1N3HfVVfps2tRP+2es/EUw3DfIqYEuckDMlemtce5IbGSkEf7Sks87FMLQyJdipNsE7dIkK I3DCjjGw+b+SSOyrrkQ== 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=2026-04-13_02,2026-04-13_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 bulkscore=0 spamscore=0 impostorscore=0 phishscore=0 clxscore=1015 suspectscore=0 priorityscore=1501 adultscore=0 lowpriorityscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2604010000 definitions=main-2604130103 On 4/12/26 2:41 AM, Dmitry Baryshkov wrote: > On Fri, Apr 10, 2026 at 10:55:53AM +0200, Konrad Dybcio wrote: >> 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? > > The HDK and DB845c reset if I try touching MDSS core reset. And David, does that also happen on your other boards? Konrad