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Mon, 31 Aug 2026 05:44:29 -0700 (PDT) X-Received: by 2002:a05:6830:7007:b0:7e9:e257:81cb with SMTP id 46e09a7af769-7f6878a21e5mr699765a34.7.1788180269258; Mon, 31 Aug 2026 05:44:29 -0700 (PDT) Received: from [10.206.96.212] ([202.46.23.25]) by smtp.gmail.com with ESMTPSA id 46e09a7af769-7f4fa7e92c1sm8011113a34.8.2026.08.31.05.44.23 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 31 Aug 2026 05:44:28 -0700 (PDT) Message-ID: <4f8a2731-4ea4-49d9-924c-ebde9fc58170@oss.qualcomm.com> Date: Mon, 31 Aug 2026 18:14:21 +0530 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird From: Arpit Saini Subject: Re: [PATCH v1] arm64: dts: qcom: sm8750-mtp: Set sufficient voltage for panel nt37801 To: Bjorn Andersson Cc: konrad.dybcio@linaro.org, robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org, conor+dt@kernel.org, dmitry.baryshkov@linaro.org, linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, quic_rajeevny@quicinc.com, quic_vproddut@quicinc.com, Dmitry Baryshkov , Konrad Dybcio References: <20260409122110.214680-1-ayushi.makhija@oss.qualcomm.com> Content-Language: en-US In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Authority-Analysis: v=2.4 cv=W6UIkxWk c=1 sm=1 tr=0 ts=6a95772e cx=c_pps a=OI0sxtj7PyCX9F1bxD/puw==:117 a=ZePRamnt/+rB5gQjfz0u9A==:17 a=IkcTkHD0fZMA:10 a=Sv0fKeRqtYgA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=gowsoOTTUOVcmtlkKump:22 a=VwQbUJbxAAAA:8 a=EUspDBNiAAAA:8 a=COk6AnOGAAAA:8 a=1-MWVyHvgWiywHnngEgA:9 a=QEXdDO2ut3YA:10 a=Z1Yy7GAxqfX1iEi80vsk:22 a=TjNXssC_j7lpFel5tvFf:22 X-Proofpoint-ORIG-GUID: Pt3fQAGU-7axfrUGz-V7o6Q1nI2ULmJv X-Proofpoint-GUID: Pt3fQAGU-7axfrUGz-V7o6Q1nI2ULmJv X-Proofpoint-Spam-Info: AW1haW4tMjYwODMxMDExMCBTYWx0ZWRfX0HG0NDbJJDWc 3pUpJFzU+BMW34ao2OEp91xAyxX92Q4Mz+SOg0E7GpfzzKWuWf32t7DGfhTDZOsck242R9ZQUY7 Sh+X9zGfyaSdaIkPd0d//MUTh5Ff/IU= X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwODMxMDExMCBTYWx0ZWRfX459R1j63DeJN aYPuWMzShMkUsiBZxnnvBkpQNyHlMhkWScjWhPBykapd5Xk6tzF8cwH/K5Tg9KD3drFW6SK6cen SGF0Q/pT4yD73te4WsuocwX1cP8SjayJ2GYXYrNQxen14W5pQLTjMgmFWZbTbZrRLC54yct2Zu6 1gZEORfp1zAuxZ4r/p1DTIPAi/UGm6ejZnE9CVjVf5t5FjqOE3M4kDJF2JRSflgSW8VTXd9OUwf 8n2MnwzKGNDv2/ZpawOJOG0WsBExnj/8eRauIj24RLGGCQnuMIuFpRhGDxSaCkfXctdtKACQFyR nLRWTk+mP4YoBvCefijQ26URxvoNO1R/kbPuzj6GPXqchCnXgVJs5DXk9oYjcK2TwstG/PbR0M9 9HIcOma8XDYl5M1c9Na+zJuSYtRpKMbj2eYGTVM3TFXkyl28xNOr0rODasOs6cxnQNgj7vUlYa9 OeCzwMQj+QeeCDug0Jw== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-08-31_04,2026-08-27_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 spamscore=0 malwarescore=0 suspectscore=0 bulkscore=0 clxscore=1015 phishscore=0 lowpriorityscore=0 priorityscore=1501 adultscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2608310110 Hi Bjorn, Ayushi is no longer with Qualcomm, so I will take ownership of this patch going forward and actively address any questions or feedback. On the Kaanapali platform, this panel is already in use, and the regulator range is configured as 1.65 V to 1.8 V. The NT37801 Specification v1.0, Chapter 5.7.1 "Power On Sequence", specifies a VDDI operating range of 1.65 V to 1.95 V. However, ldo12 supports an output range of 1.2 V to 1.8 V. Therefore, the regulator constraints have been updated to 1.65 V to 1.8 V, which is within both the panel's supported range and the regulator's capabilities. Link : https://lore.kernel.org/all/20260322-knp-pmic-dt-v1-6-70bc40ea4428@oss.qualcomm.com/ Please let me know if you have any further queries. Thanks, Arpit On 6/17/2026 11:11 PM, Bjorn Andersson wrote: > On Thu, Apr 09, 2026 at 05:51:09PM +0530, Ayushi Makhija wrote: > > Here's a link to "v1": > https://lore.kernel.org/all/20260323102229.1546504-1-quic_amakhija@quicinc.com/ > Which makes this v2. > > You also ignored my feedback. > > Thank you, > Bjorn > >> The NT37801 Sepc V1.0 chapter "5.7.1 Power On Sequence" states >> VDDI=1.65V~1.95V, so set sufficient voltage for panel nt37801. >> >> Fixes: 4fca6849864d ("drm/panel: Add Novatek NT37801 panel driver") >> Signed-off-by: Ayushi Makhija >> Reviewed-by: Dmitry Baryshkov >> Reviewed-by: Konrad Dybcio >> --- >> arch/arm64/boot/dts/qcom/sm8750-mtp.dts | 2 +- >> 1 file changed, 1 insertion(+), 1 deletion(-) >> >> diff --git a/arch/arm64/boot/dts/qcom/sm8750-mtp.dts b/arch/arm64/boot/dts/qcom/sm8750-mtp.dts >> index 3837f6785320..6ba4e69bf377 100644 >> --- a/arch/arm64/boot/dts/qcom/sm8750-mtp.dts >> +++ b/arch/arm64/boot/dts/qcom/sm8750-mtp.dts >> @@ -462,7 +462,7 @@ vreg_l11b_1p0: ldo11 { >> >> vreg_l12b_1p8: ldo12 { >> regulator-name = "vreg_l12b_1p8"; >> - regulator-min-microvolt = <1200000>; >> + regulator-min-microvolt = <1650000>; >> regulator-max-microvolt = <1800000>; >> regulator-initial-mode = ; >> regulator-allow-set-load; >> -- >> 2.34.1 >>