Messages in this thread | | | Date | Fri, 29 May 2020 18:27:28 +0200 | From | Pavel Machek <> | Subject | Re: [PATCH v3 4/5] arm64: dts: sun50i-a64-pinephone: Enable LCD support on PinePhone |
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Hi!
> PinePhone uses PWM backlight and a XBD599 LCD panel over DSI for > display. > > Backlight levels curve was optimized by Martijn Braam using a > lux meter.
If it was possible to preserve lux values for individual settings in the comment somewhere... that would be nice :-).
One day, it would be nice to have brightness settings in lux, so I could easily set matching levels on multiple devices, for example...
Best regards,
Pavel
> + > +&backlight { > + power-supply = <®_ldo_io0>; > + /* > + * PWM backlight circuit on this PinePhone revision was changed since > + * 1.0, and the lowest PWM duty cycle that doesn't lead to backlight > + * being off is around 20%. Duty cycle for the lowest brightness level > + * also varries quite a bit between individual boards, so the lowest > + * value here was chosen as a safe default. > + */ > + brightness-levels = < > + 774 793 814 842 > + 882 935 1003 1088 > + 1192 1316 1462 1633 > + 1830 2054 2309 2596 > + 2916 3271 3664 4096>; > + num-interpolated-steps = <50>; > + default-brightness-level = <400>;
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