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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 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-Proofpoint-Spam-Info: AW1haW4tMjYwODMxMDExMCBTYWx0ZWRfXxTdPB5AbpTsi G9wmzOu6GlTXZC0YBVs4pIr6CYm7wC+ScD/Vvz5cNclcLuhsRRxVJn0HoxbgoSepHh0LOcWNWBQ s+jS2J1vae53UwOdl05bHXXabkf9HDE= X-Authority-Analysis: v=2.4 cv=CpaPtH4D 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=ZpdpYltYx_vBUK5n70dp: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-Spam-Details-Enc: AW1haW4tMjYwODMxMDExMCBTYWx0ZWRfXyu7iYayFDgJ/ hXVFhEAuXa7lPV9OGxuikSMkJst0BVSB5lA/F7xMVMkD0/SbP9l0jLVHDVCc1cGkD3esLeiUist xljRQxLArqaMPKHTNtHwz/9OphSmH3hUHSRIO+pJpRRXvEVwDeXHxdefEYfCrRwVvrbiYoL3bz6 RK1lbdwr2q//VUh2FMIBN8bQFBWl4kr6IpwADEIkPmCNS4BAZgcOlkcCjqmSsFewpQUTPYcV3Yw C8vfHOJV2LJaoof5EjFMAE5FPzaCITWHWCaVp2w/y7ryNDgX9Jf86+9zjsU9ilZ6Yu8CjArvXZB fxykOYVFX5VKjSGGUNtcDLu1spgOTClaURLwDGdTJT6KvCfcYG+lJ2YNSnpubo51fXGsfWOlt9w BvI4tDMysFe07DNoeb++YkkUhjvWMiUGt3jZcbJuhB5qUvZv9ilDPP1a/mmSWhQ92Az36dxHxPO uSYjiecuE8K4sYoivmA== X-Proofpoint-ORIG-GUID: qSmip47TYfnHSSB5v27QWYzG2nUPDp6S X-Proofpoint-GUID: qSmip47TYfnHSSB5v27QWYzG2nUPDp6S 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 bulkscore=0 adultscore=0 lowpriorityscore=0 clxscore=1011 priorityscore=1501 malwarescore=0 phishscore=0 suspectscore=0 spamscore=0 impostorscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2608310110 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260831_054432_687702_BA607C3E X-CRM114-Status: GOOD ( 20.91 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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 >>