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Thu, 09 Apr 2026 05:44:25 +0000 (GMT) Received: from nasanex01b.na.qualcomm.com (nasanex01b.na.qualcomm.com [10.46.141.250]) by NASANPPMTA01.qualcomm.com (8.18.1.7/8.18.1.7) with ESMTPS id 6395iPQp005642 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 9 Apr 2026 05:44:25 GMT Received: from [10.204.78.136] (10.80.80.8) by nasanex01b.na.qualcomm.com (10.46.141.250) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.17; Wed, 8 Apr 2026 22:44:21 -0700 Message-ID: <75d22f54-eb55-4e55-9582-5b407f41ee81@quicinc.com> Date: Thu, 9 Apr 2026 11:14:10 +0530 Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] arm64: dts: qcom: sm8750-mtp: Set sufficient voltage for panel nt37801 To: Bjorn Andersson CC: , , , , , , , , , , References: <20260323102229.1546504-1-quic_amakhija@quicinc.com> Content-Language: en-US From: Ayushi Makhija In-Reply-To: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-ClientProxiedBy: nasanex01a.na.qualcomm.com (10.52.223.231) To nasanex01b.na.qualcomm.com (10.46.141.250) X-QCInternal: smtphost X-Authority-Analysis: v=2.4 cv=TL51jVla c=1 sm=1 tr=0 ts=69d73cb9 cx=c_pps a=JYp8KDb2vCoCEuGobkYCKw==:117 a=JYp8KDb2vCoCEuGobkYCKw==:17 a=GEpy-HfZoHoA:10 a=IkcTkHD0fZMA:10 a=A5OVakUREuEA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=yOCtJkima9RkubShWh1s:22 a=VwQbUJbxAAAA:8 a=EUspDBNiAAAA:8 a=COk6AnOGAAAA:8 a=aBhg6lAgCmotgtkINXQA:9 a=QEXdDO2ut3YA:10 a=TjNXssC_j7lpFel5tvFf:22 X-Proofpoint-ORIG-GUID: 7WIROd-NrMSWNwZCJBRQx7cIGvSuiUE0 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNDA5MDA0OSBTYWx0ZWRfX5vM6VqO5rN+i v6LUPkUK/b15O2dhDuBGalFDRemVvnr2yDQydvGJwAAAOwA+slMCzMAknVM0D+cBZCMrz4p2trI kBWEI/uDIWzeQNYVy/zZv3O+0pjA3+LfuhOaXX84cTaTgo+hiHkXTKOHzFGGCd4NNE4+tiRXvMH LROfd9T0yVqP4OFQgq0ODlRkegPEREdwykIP9ZppJ06WfiCOcuF2KuVFzHcbOAYuQ5ecNP+EVxz +2EJYYMH9Nw6o/2w5PfGhbsTPVbC62fkhuZ3e/OPChVXkoiCXV+PW4YBKWpzG+WrLEB2zH27kUL H8fmsIbzJ6hKerriKr4Uv0/AWQ8CUNuD5INbvkbwUKHknqgEu3D9fROE9y0MlFx0S3B7h7IOfEh G6tv10cGaFkC6NBDexJLbldDH+9yvb9+HiIFeY8UxvCBQFcpd47o4OsgFgYabFfFPP9Tlb3qlQZ JzHGj7hwCHVBrRE73eg== X-Proofpoint-GUID: 7WIROd-NrMSWNwZCJBRQx7cIGvSuiUE0 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-04-09_01,2026-04-08_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 priorityscore=1501 clxscore=1015 bulkscore=0 adultscore=0 spamscore=0 suspectscore=0 impostorscore=0 malwarescore=0 lowpriorityscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2604010000 definitions=main-2604090049 On 3/26/2026 9:28 PM, Bjorn Andersson wrote: > On Thu, Mar 26, 2026 at 03:06:52PM +0530, Ayushi Makhija wrote: >> On 3/24/2026 7:34 AM, Bjorn Andersson wrote: >>> On Mon, Mar 23, 2026 at 03:52:29PM +0530, Ayushi Makhija wrote: >>>> 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. >>>> >>> >>> Please add Fixes: tag. >>> >> >> Hi Bjorn, >> >> Sure, will add in new patchset. >> >>>> Signed-off-by: Ayushi Makhija >>> >>> Please start using your oss.qualcomm.com address. >>> >>>> --- >>>> 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>; >>> >>> Are you sure it's not supposed to be 1.8V, given the name of the rail? >>> >>> Regards, >>> Bjorn >> >> There was already discussion regarding the minimum voltage for this regulator on sm8550 target >> on other upstream patch. >> >> Link: https://lore.kernel.org/all/aQQdQoCLeKhYtY7W@yuanjiey.ap.qualcomm.com/ >> >> This values is according to the NT37801 panel sec >> "The NT37801 Sepc V1.0 chapter "5.7.1 Power On Sequence" states >> VDDI=1.65V~1.95V." >> > > Yes, so the panel requires 1.65V, so regulator-min-microvolt needs to be > at least that. But regulator-min-microvolt should account for all the > consumers of the rail, are there any others? > > Which leads me to my question, the people designing the board named the > rail VREG_L12B_1P8 in the schematics, why didn't they name it > VREG_L12B_1P65? > > Please check all the consumers and make the regulator-min-microvolt work > for all of them - if that's 1.65V, then your change is good. > > Regards, > Bjorn Hi Bjorn, There is only one consumer of VREG_L12B_1P8 rail, i.e. NT37801 panel. So regulator-min-microvolt as 1.65V should be fine for VREG_L12B_1P8 rail. Thanks, Ayushi