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arm64: dts: qcom: trogdor: Add brightness-levels

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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.

Acked-by: Daniel Thompson <daniel.thompson@linaro.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Alexandru Stan <amstan@chromium.org>
Link: https://lore.kernel.org/r/20201021220404.v3.2.Ie4d84af5a85e8dcb8f575845518fa39f324a827d@changeid
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
This commit is contained in:
Alexandru Stan
2020-10-21 22:04:44 -07:00
committed by Bjorn Andersson
parent c422aa82ab
commit ab8e32da3a
1 changed files with 9 additions and 0 deletions
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9
arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi
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@@ -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>;