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

[Ayushi Makhija]

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 <quic_amakhija@xxxxxxxxxxx>
> 
> 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@xxxxxxxxxxxxxxxxxxxxxxxx/

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."

Thanks,
Ayushi

>>  			regulator-max-microvolt = <1800000>;
>>  			regulator-initial-mode = <RPMH_REGULATOR_MODE_HPM>;
>>  			regulator-allow-set-load;
>> -- 
>> 2.34.1
>>