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| author | Alexandru Stan <amstan@chromium.org> | 2020-10-22 08:04:44 +0300 |
|---|---|---|
| committer | Bjorn Andersson <bjorn.andersson@linaro.org> | 2020-11-04 02:44:40 +0300 |
| commit | ab8e32da3a39e558d2fa2bc46a25eb2f0e885a16 (patch) | |
| tree | b4047766342d33ee2a66f0a49e4e641b77195e5e /arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi | |
| parent | c422aa82abb75436bc31e0da7970aa1f9248b090 (diff) | |
| download | linux-ab8e32da3a39e558d2fa2bc46a25eb2f0e885a16.tar.xz | |
arm64: dts: qcom: trogdor: Add brightness-levels
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>
Diffstat (limited to 'arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi')
| -rw-r--r-- | arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi b/arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi index 0759896a0df5..8653a38a3e42 100644 --- a/arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi +++ b/arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi @@ -179,6 +179,15 @@ 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>; |