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Mon, 26 Oct 2026 03:00:18 -0700 (PDT) Received: from [192.168.226.26] ([178.235.128.140]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-c46bd7abf6asm295380766b.81.2026.10.26.03.00.15 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 26 Oct 2026 03:00:17 -0700 (PDT) Message-ID: <0a36d49a-a1c8-4434-a9c9-36cb1ccfc097@oss.qualcomm.com> Date: Mon, 26 Oct 2026 11:00:14 +0100 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 Subject: Re: [PATCH v2] arm64: dts: qcom: x1e80100-medion-sprchrgd-14-s1: Add PWM backlight To: ferreira@se-rg.io, Bjorn Andersson , Konrad Dybcio , Abel Vesa , Rob Herring , Krzysztof Kozlowski , Conor Dooley Cc: linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Georg Gottleuber , Ettore Chimenti , Jens Glathe , Srinivas Kandagatla References: <20261025-medion-sprchrgd-14-backlight-v2-1-bf2979485ec2@se-rg.io> Content-Language: en-US From: Konrad Dybcio In-Reply-To: <20261025-medion-sprchrgd-14-backlight-v2-1-bf2979485ec2@se-rg.io> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Proofpoint-ORIG-GUID: tuv_q5d6b8QZq4tJ93HD_sau0qQ_gY5R X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMDI2MDAzOSBTYWx0ZWRfXxoYBV6hKB5+J 7vU9kVeJ7CPt6Tju2P02DgwvidDi8a+VD+7IxI02WOxwm31b+jtWifs2FPzS/4GUHt9NSwCpGnJ 9fDxFK8al0wmf89xnAqZfei7Rmv5C0b5bS2NneHTVj9a3xq3X6RwFTfEEtiPzUzNVhhl2keURB0 Byo7EnfCL2v/yxE8PQ3wSL433xdWCC9B5LaondMotZVkJ8DsYQ8ao2xm5PP7+AKc7U08Lj7Hu5E oVDBwxzDWNp/nMFmOF7czjK3Ry/4aDeg8G2nDumHkJlOlR1zeRujKZnFjBiGtN3/2hVS1fC+1i5 kR0J1o+58BQsOHMIEucHa3Hs5UUN162SH9a+ObL2WxC9I+HLZDAhiX7TU1NsK4ANXyQumrEcObM DCgoABYmhxh6gfdrbdH0mDCudSzDE/LXo6EbkVVYeMIKEcbVvyAfY4DH7uq/FbjnRnO56/ZFIJI NsSUsJy5D1zwrpK5i2A== X-Proofpoint-Spam-Info: AW1haW4tMjYxMDI2MDAzOSBTYWx0ZWRfX+/k3y1oOq2tE 8Y3DlKXnYqM4Z3bmsQaaPN/28uixEMl1SlnPHa23BxzZo/Lp8Iynh0BBjYhFf6pL2lgeyJVyB2X MhPdiuUPHIdb/DTeDv/XZhTDSmngClE= X-Authority-Analysis: v=2.4 cv=UqX2pOwB c=1 sm=1 tr=0 ts=6adf24b4 cx=c_pps a=EVbN6Ke/fEF3bsl7X48z0g==:117 a=PRfkaYvzSr8QmIIGAkY2Sg==:17 a=IkcTkHD0fZMA:10 a=660iZSQnnn4A:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=Um2Pa8k9VHT-vaBCBUpS:22 a=EUspDBNiAAAA:8 a=85Z2xdU_f4vHkJConSkA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 a=a_PwQJl-kcHnX1M80qC6:22 X-Proofpoint-GUID: tuv_q5d6b8QZq4tJ93HD_sau0qQ_gY5R 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=2026-10-26_01,2026-10-21_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 suspectscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 impostorscore=0 bulkscore=0 phishscore=0 adultscore=0 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2610190000 definitions=main-2610260039 On 10/25/26 8:51 AM, Sérgio Ferreira via B4 Relay wrote: > From: Sérgio Ferreira > > The eDP panel (CSOT MNE007ZA3-2, IPS LCD) cannot have its brightness > set over eDP AUX. With no backlight phandle on the panel, panel-edp > falls back to the DP AUX backlight, which registers dp_aux_backlight > with a maximum brightness of 0, so brightness control has no effect. > > Brightness is driven by PWM instead. UEFI leaves PM8550 LPG channel 3 > running and the PWM output configured on PM8550 GPIO 8, and drives > PMC8380_3 GPIO 4 high as the backlight enable: > > pm8550 gpio8 : out low func1 vin-0 no pull push-pull medium > pmc8380_3 gpio4 : out high normal vin-1 pull-down push-pull medium > > The panel configuration in the Windows ACPI tables confirmed this. > (PMIC-controlled PWM, PMIC 1, bank 3, 9-bit, 2 kHz). > > Describe this with a pwm-backlight node: enable pm8550_pwm, add pinctrl > states for the enable GPIO and for gpio8 func1, and attach the > backlight to the panel. > > Tested on a Medion SPRCHRGD 14 S1 (X1E78100): brightness control over > the full range, brightness keys, suspend/resume and restore after > reboot. > > Assisted-by: LLM > Signed-off-by: Sérgio Ferreira > --- Reviewed-by: Konrad Dybcio Konrad