On Wed, Oct 29, 2025 at 02:20:13PM +0200, Dmitry Baryshkov wrote: > On Wed, Oct 29, 2025 at 09:58:39AM +0800, yuanjiey wrote: > > On Mon, Oct 27, 2025 at 02:22:04PM +0200, Dmitry Baryshkov wrote: > > > On Fri, Oct 24, 2025 at 02:00:50PM +0800, yuanjiey wrote: > > > > On Thu, Oct 23, 2025 at 03:14:38PM +0300, Dmitry Baryshkov wrote: > > > > > On Thu, Oct 23, 2025 at 04:06:04PM +0800, yuanjie yang wrote: > > > > > > From: Yuanjie Yang <[email protected]> > > > > > > > > > > > > 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. > > > > > > > > > > > > Signed-off-by: Yongxing Mou <[email protected]> > > > > > > Signed-off-by: Yuanjie Yang <[email protected]> > > > > > > --- > > > > > > drivers/gpu/drm/panel/panel-novatek-nt37801.c | 5 +++++ > > > > > > 1 file changed, 5 insertions(+) > > > > > > > > > > > > diff --git a/drivers/gpu/drm/panel/panel-novatek-nt37801.c > > > > > > b/drivers/gpu/drm/panel/panel-novatek-nt37801.c > > > > > > index d6a37d7e0cc6..7eda16e0c1f9 100644 > > > > > > --- a/drivers/gpu/drm/panel/panel-novatek-nt37801.c > > > > > > +++ b/drivers/gpu/drm/panel/panel-novatek-nt37801.c > > > > > > @@ -267,6 +267,11 @@ static int novatek_nt37801_probe(struct > > > > > > mipi_dsi_device *dsi) > > > > > > if (ret < 0) > > > > > > return ret; > > > > > > > > > > > > + ret = regulator_set_voltage(ctx->supplies[0].consumer, > > > > > > + 1650000, 1950000); > > > > > > > > > > This should be done in the DT. Limit the voltage per the user. > > > > Two reason: > > > > 1. > > > > I see https://patchwork.freedesktop.org/patch/354612/ > > > > > > > > panel panel-novatek-nt35510.c also use regulator_set_voltage set right > > > > voltage, > > > > so I do the same work. > > > > > > Please look for the majority rather than the exceptions. Out of all > > > panel drivers only two set the voltage directly. > > > > > > > > > > > 2. Kaanapali vddio regulator: > > > > > > > > vreg_l12b_1p8: ldo12 { > > > > regulator-name = "vreg_l12b_1p8"; > > > > regulator-min-microvolt = <1200000>; > > > > regulator-max-microvolt = <1800000>; > > > > > > > > Voltage is from 1.2~.1.8 V , So I can not set it 1.65~1.95 V > > > > from DT(1.95V is beyond the allowed range). > > > > So I use regulator_set_voltage to set voltage, and > > > > regulator_set_voltage will choose the appropriate voltage. > > > > > > DT has to list the voltage values that work for the devices on that > > > particular platform. So, ldo12 should be listing 1.64 - 1.8 V. > > get it. I check downstream DT, > > dosnstream DT: > > regulator-min-microvolt = <1800000>; > > regulator-max-microvolt = <1800000>; > > > > I test 1.8V works, So I will add 1.8V in next patch, do you think it is > > ok? > > What does panel's datasheet say?
The NT37801 Sepc V1.0 chapter "5.7.1 Power On Sequence" states VDDI=1.65V~1.95V. So I should follow datasheet to set DT ldo12: 1.64 - 1.8V ? if you think it is ture, I will fix it in next patch. Thanks, Yuanjie > -- > With best wishes > Dmitry
