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[78.88.45.245]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-b486970b2basm1094364466b.51.2025.10.06.01.36.44 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 06 Oct 2025 01:36:45 -0700 (PDT) Message-ID: Date: Mon, 6 Oct 2025 10:36:43 +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 v3 10/11] arm64: dts: qcom: sdm845-lg-judyln: Add lab/ibb To: Dmitry Baryshkov , Paul Sajna Cc: Bjorn Andersson , Konrad Dybcio , Rob Herring , Krzysztof Kozlowski , Conor Dooley , David Heidelberg , linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, phone-devel@vger.kernel.org, Amir Dahan , Christopher Brown References: <20250928-judyln-dts-v3-0-b14cf9e9a928@postmarketos.org> <20250928-judyln-dts-v3-10-b14cf9e9a928@postmarketos.org> <38c70e06-f7bf-4ca6-8fe9-2a4012017cff@oss.qualcomm.com> <64a732cdc3fe9381e2f716be9e965fbc905c1416@postmarketos.org> Content-Language: en-US From: Konrad Dybcio In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUxMDA0MDAxNyBTYWx0ZWRfX/Kf9vKeAyFMh lyORFEqI8KfzVUkTHX0LpWiUP20pvSGpyxi0via2mOmDeNl6SBoQAjaQlwxD/kO9HKwysolAREo NuVUpAl1Sggb6rIDJUcLIHdVn31cAwYzGAxM0Vmw+0dtWKD+QiflzfsgPv4oLq8cAe6vdeNNalg ccmAh4Hm/Kr8c+XtkiAxiHH0nw7rJJtkCNa/RDMIdyLC1Y/J81G4hU/4x5Z+4gj6GvkI1C5racH XcorfOtgm3LLPnDLVezCySGa768I6aGKUntpcf9uo9BYMSJ4Kyxb5/TeQ/d4XYXsJ27ohPI7XrX Ks7GFEGYiDF+6X6TSvh/UpfdOdmRDk4On3PNKXi4Wk/7aRrYIrwX0IrTFrxceAK7dEQsarpSWZR 2QcWE7/JPSBGlnCnRm/0Rk/EKDBV8w== X-Authority-Analysis: v=2.4 cv=do3Wylg4 c=1 sm=1 tr=0 ts=68e37f9f cx=c_pps a=hnmNkyzTK/kJ09Xio7VxxA==:117 a=FpWmc02/iXfjRdCD7H54yg==:17 a=IkcTkHD0fZMA:10 a=x6icFKpwvdMA:10 a=EUspDBNiAAAA:8 a=NEAV23lmAAAA:8 a=ruIub6WMR363QC8emKcA:9 a=lqcHg5cX4UMA:10 a=QEXdDO2ut3YA:10 a=PEH46H7Ffwr30OY-TuGO:22 X-Proofpoint-GUID: ptDbIBdyQS2VGI1zw4hf3ACYDz4jwJO- X-Proofpoint-ORIG-GUID: ptDbIBdyQS2VGI1zw4hf3ACYDz4jwJO- X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1117,Hydra:6.1.9,FMLib:17.12.80.40 definitions=2025-10-06_03,2025-10-02_03,2025-03-28_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 adultscore=0 lowpriorityscore=0 phishscore=0 clxscore=1015 malwarescore=0 spamscore=0 impostorscore=0 priorityscore=1501 bulkscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2509150000 definitions=main-2510040017 On 10/3/25 11:55 PM, Dmitry Baryshkov wrote: > On Thu, Oct 02, 2025 at 04:55:44AM +0000, Paul Sajna wrote: >> October 1, 2025 at 9:09 AM, "Konrad Dybcio" wrote: >> >> >>> >>> On 9/29/25 7:05 AM, Paul Sajna wrote: >>> >>>> >>> This patch will allow any values between 4.6 V and 6.0 V to >>> be set on your phone, with the kernel defaulting to 4.6 V at >>> boot and staying there until (if?) any driver requests that to >>> change. >>> >>> Your panel probably expects a *very* specific pair of voltages >>> and any deviation may cause unpredictable consequences, including >>> magic smoke if you happen to go over a certain limit. >>> >>> You should most likely hardcode that specific expected voltage here >> >> These are the values used in downstream android dts >> https://github.com/LineageOS/android_kernel_lge_sdm845/blob/efa8458f79dffeb380d43b38b9403407f87d9f05/arch/arm64/boot/dts/qcom/pmi8998.dtsi#L484-L485 > > Downstream frequently further constraints the regulators. Could you > please check the boards's dts file and the drivers (SDE)? Or you can read back the values at runtime.. presumably even /sys/kernel/debug/regulator/foo should have the up-to-date info Konrad