Re: [PATCH v1] arm64: dts: qcom: sm8750-mtp: Set sufficient voltage for panel nt37801

[Arpit Saini]

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@xxxxxxxxxxxxxxxx/ 

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@xxxxxxxxxxx/
> 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 <ayushi.makhija@xxxxxxxxxxxxxxxx>
>> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxxxxxxxx>
>> Reviewed-by: Konrad Dybcio <konrad.dybcio@xxxxxxxxxxxxxxxx>
>> ---
>>  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 = <RPMH_REGULATOR_MODE_HPM>;
>>  			regulator-allow-set-load;
>> -- 
>> 2.34.1
>>