Messages in this thread Patch in this message | | | From | Alexandru Stan <> | Subject | [PATCH v3 2/3] arm64: dts: qcom: trogdor: Add brightness-levels | Date | Wed, 21 Oct 2020 22:04:44 -0700 |
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We want userspace to represent the human perceived brightness. Since the led drivers and the leds themselves don't have a linear response to the value we give them in terms of perceived brightness, we'll bake the curve into the dts.
The panel also doesn't have a good response under 5%, so we'll avoid sending it anything lower than that.
Note: Ideally this patch should be coupled with the driver change from "backlight: pwm_bl: Fix interpolation", but it can work without it, without looking too ugly.
Signed-off-by: Alexandru Stan <amstan@chromium.org> ---
arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi | 9 +++++++++ 1 file changed, 9 insertions(+)
diff --git a/arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi b/arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi index bf875589d364..ccdabc6c4994 100644 --- a/arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi +++ b/arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi @@ -179,6 +179,15 @@ pp3300_fp_tp: pp3300-fp-tp-regulator { backlight: backlight { compatible = "pwm-backlight"; + /* The panels don't seem to like anything below ~ 5% */ + brightness-levels = < + 196 256 324 400 484 576 676 784 900 1024 1156 1296 + 1444 1600 1764 1936 2116 2304 2500 2704 2916 3136 + 3364 3600 3844 4096 + >; + num-interpolated-steps = <64>; + default-brightness-level = <951>; + pwms = <&cros_ec_pwm 1>; enable-gpios = <&tlmm 12 GPIO_ACTIVE_HIGH>; power-supply = <&ppvar_sys>; -- 2.28.0
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