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Thu, 12 Nov 2026 00:22:20 -0800 (PST) Received: from [10.206.111.19] ([202.46.23.25]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-3b182debb54sm3082736a91.2.2026.11.12.00.22.15 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 12 Nov 2026 00:22:20 -0800 (PST) Message-ID: <2ac0ce9b-f54e-46ff-9d28-511c07a4fe18@oss.qualcomm.com> Date: Thu, 12 Nov 2026 13:52:14 +0530 X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 User-Agent: Mozilla Thunderbird From: Nihal Kumar Gupta Subject: Re: [PATCH v2 3/6] arm64: dts: qcom: glymur: Add camera MCLK pinctrl To: Jesse Casco , Konrad Dybcio Cc: Bjorn Andersson , Konrad Dybcio , Abel Vesa , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Bryan O'Donoghue , linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Suresh Vankadara , Vikram Sharma , Abel Vesa References: <20261015-glymur_camss_dts-v2-3-e7b1f403146f@oss.qualcomm.com> <20261110221232.3883-1-jesse.casco@gmail.com> Content-Language: en-US In-Reply-To: <20261110221232.3883-1-jesse.casco@gmail.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Proofpoint-GUID: MKpXzcDdxhoXkst6H65ClY1OaF-JMM2A X-Proofpoint-Spam-Info: AW1haW4tMjYxMTEyMDAzMyBTYWx0ZWRfX+dzZ8RN+Ib+H QvkZS62aGrnCxoChaAaZ53WOWCE0QZQA8MlU+DAnE7Uc7BJb0r8hvesL/61AWVsTMeHosUeUox3 p5j/e44lMxykLWT9OQvJ4bDqjtPoU00= X-Proofpoint-ORIG-GUID: MKpXzcDdxhoXkst6H65ClY1OaF-JMM2A X-Authority-Analysis: v=2.4 cv=d49gWhjE c=1 sm=1 tr=0 ts=6af5773d cx=c_pps a=RP+M6JBNLl+fLTcSJhASfg==:117 a=ZePRamnt/+rB5gQjfz0u9A==:17 a=IkcTkHD0fZMA:10 a=zJRp6_cAMcgA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=YMgV9FUhrdKAYTUUvYB2:22 a=smo19LPPzjqg-eG-KNYA:9 a=QEXdDO2ut3YA:10 a=iS9zxrgQBfv6-_F4QbHw:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMTEyMDAzMyBTYWx0ZWRfXyXwHrpmUvWpT caIeaV1tUsIOPQFdQDGvPY7cvLc8wRuqn8rzpjA00/Pv4QeWScvZ51xuX+cvXD7lgk8mOXO6Dtg uCChTx1W8ujuioXpTmzX2MFLzH5igr5CBy9fq6OEMFG/V09nxaRY68rFax7HV/10jRftrhWPPGw 13lY88gsxp14ZFBnycvigNZTamwF+KJSF7suYeHZ2wqbSPKHOwK4Cp5c2438ctZCExvNlsT8sXG nnujK9K+6M+xaciaJvrclL9hTU8ePzX0zn5LawsWAESXzjIK/ykg9nwYnFedh3j52Y7QjAl2BMH rUgHufX1gNBHsYFOWlrgGVY0pzUrCxMJLM+/cTxJWOAgeSKTIXyL+uLWWsw0wjVg8h3mokErJOk 6F/sAaI5XntnGk1B+OBWjqqAExrxxYbkAmMPSqhzYDXiFWqi3DHIR/342N8suxGZ3tx4PJlt1fb A1RyoSPPb/VBj5UK4kQ== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.138,FMLib:17.12.100.49 definitions=2026-11-12_01,2026-11-11_03,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 spamscore=0 malwarescore=0 clxscore=1015 suspectscore=0 adultscore=0 lowpriorityscore=0 impostorscore=0 bulkscore=0 priorityscore=1501 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2611040001 definitions=main-2611120033 On 11-11-2026 03:42, Jesse Casco wrote: >> + cam_mclk4_default: cam-mclk4-default-state { >> + pins = "gpio100"; >> + function = "cam_asc_mclk4"; >> + drive-strength = <2>; >> + bias-disable; >> + }; > I've been running this series on an ASUS Zenbook A16 (UX3607OA), which > has an OV02C10 on MCLK4 at 19.2 MHz. With 2 mA here the sensor shows > horizontal banding, and its frame period stretches by about 9%, whenever > the internal DMIC clock (LPASS LPI GPIO6, 2.4 MHz) is running. The bands > are already in the RAW10 frames, and the sensor test pattern is clean, > so it looks like the MCLK pad itself rather than CSI or the ISP. > > Changing only this pin to 6 mA fixes it. A/B/A across three boots, same > kernel, fixed exposure/gain, row high-pass RMS / frame period: > > MCLK4 mic off mic on after > 2 mA 0.96 / 33.28 ms 20.44 / 36.17 ms 1.04 / 33.27 ms > 6 mA 0.89 / 33.27 ms 0.90 / 33.27 ms 0.90 / 33.27 ms > 2 mA 0.95 / 33.27 ms 15.33 / 34.37 ms 0.93 / 33.28 ms > > At 6 mA the frame timing holds steady at 33.27 ms and the image stays > clean in every phase, including while the microphone is recording, > which is exactly the case that couples interference into the 2 mA > clock. Normal camera use with the mic on is also clean at 6 mA, so the > fix holds up on real hardware, not just in the capture script. > > Could cam_mclk4_default use 6 mA? If you'd rather keep 2 mA in the SoC > dtsi, I'll override it in the A16 board DT instead. Hi Jesse, Thanks for the detailed testing and measurements. Konrad, what would you suggest here: update the SoC dtsi to 6 mA, or keep 2 mA there and override it only in the A16 board DT? -- Regards, Nihal Kumar Gupta