October 1, 2025 at 9:09 AM, "Konrad Dybcio" <[email protected] mailto:[email protected]?to=%22Konrad%20Dybcio%22%20%3Ckonrad.dybcio%40oss.qualcomm.com%3E > wrote:
> > On 9/29/25 7:05 AM, Paul Sajna wrote: > > > > > These regulators seemingly help the lcd to work better > > > Electronics generally work better when the required power supplies > are enabled.. > > > > > Signed-off-by: Paul Sajna <[email protected]> > > --- > > arch/arm64/boot/dts/qcom/sdm845-lg-judyln.dts | 17 +++++++++++++++++ > > 1 file changed, 17 insertions(+) > > > > diff --git a/arch/arm64/boot/dts/qcom/sdm845-lg-judyln.dts > > b/arch/arm64/boot/dts/qcom/sdm845-lg-judyln.dts > > index > > 3106fdc9b679bc6a43a1a490c61b73a63003f7e1..9c3662a3d93e124667474753e0f11d0e98698aa0 > > 100644 > > --- a/arch/arm64/boot/dts/qcom/sdm845-lg-judyln.dts > > +++ b/arch/arm64/boot/dts/qcom/sdm845-lg-judyln.dts > > @@ -48,10 +48,27 @@ zap-shader { > > }; > > }; > > > > +&ibb { > > + regulator-min-microvolt = <4600000>; > > + regulator-max-microvolt = <6000000>; > > + regulator-over-current-protection; > > + regulator-pull-down; > > + regulator-soft-start; > > + qcom,discharge-resistor-kohms = <300>; > > +}; > > + > > &ipa { > > firmware-name = "qcom/sdm845/lg/judyln/ipa_fws.mbn"; > > }; > > > > +&lab { > > + regulator-min-microvolt = <4600000>; > > + regulator-max-microvolt = <6000000>; > > + regulator-over-current-protection; > > + regulator-pull-down; > > + regulator-soft-start; > > +}; > > > This patch will allow any values between 4.6 V and 6.0 V to > be set on your phone, with the kernel defaulting to 4.6 V at > boot and staying there until (if?) any driver requests that to > change. > > Your panel probably expects a *very* specific pair of voltages > and any deviation may cause unpredictable consequences, including > magic smoke if you happen to go over a certain limit. > > You should most likely hardcode that specific expected voltage here > > Konrad > These are the values used in downstream android dts https://github.com/LineageOS/android_kernel_lge_sdm845/blob/efa8458f79dffeb380d43b38b9403407f87d9f05/arch/arm64/boot/dts/qcom/pmi8998.dtsi#L484-L485
