6233269bce
Use interpolated brightness tables (added by commit 573fe6d1c2
("backlight: pwm_bl: Linear interpolation between
brightness-levels") for veyron, instead of specifying every single
step. Some devices/panels have intervals that are smaller than
the specified 'num-interpolated-steps', the driver interprets
these intervals as a single step.
Another option would be to switch to a perceptual brightness curve
(CIE 1931), with the caveat that it would change the behavior of
the backlight. Also the concept of a minimum brightness level is
currently not supported for CIE 1931 curves.
Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Link: https://lore.kernel.org/r/20191003094137.v2.1.Ic9fd698810ea569c465350154da40b85d24f805b@changeid
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
142 lines
2.7 KiB
Plaintext
142 lines
2.7 KiB
Plaintext
// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
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/*
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* Google Veyron (and derivatives) fragment for the edp displays
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*
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* Copyright 2019 Google LLC
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*/
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/ {
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backlight_regulator: backlight-regulator {
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compatible = "regulator-fixed";
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enable-active-high;
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gpio = <&gpio2 RK_PB4 GPIO_ACTIVE_HIGH>;
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pinctrl-names = "default";
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pinctrl-0 = <&bl_pwr_en>;
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regulator-name = "backlight_regulator";
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vin-supply = <&vcc33_sys>;
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startup-delay-us = <15000>;
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};
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panel_regulator: panel-regulator {
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compatible = "regulator-fixed";
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enable-active-high;
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gpio = <&gpio7 RK_PB6 GPIO_ACTIVE_HIGH>;
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pinctrl-names = "default";
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pinctrl-0 = <&lcd_enable_h>;
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regulator-name = "panel_regulator";
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vin-supply = <&vcc33_sys>;
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};
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vcc18_lcd: vcc18-lcd {
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compatible = "regulator-fixed";
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enable-active-high;
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gpio = <&gpio2 RK_PB5 GPIO_ACTIVE_HIGH>;
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pinctrl-names = "default";
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pinctrl-0 = <&avdd_1v8_disp_en>;
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regulator-name = "vcc18_lcd";
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regulator-always-on;
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regulator-boot-on;
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vin-supply = <&vcc18_wl>;
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};
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backlight: backlight {
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compatible = "pwm-backlight";
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brightness-levels = <0 255>;
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num-interpolated-steps = <255>;
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default-brightness-level = <128>;
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enable-gpios = <&gpio7 RK_PA2 GPIO_ACTIVE_HIGH>;
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pinctrl-names = "default";
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pinctrl-0 = <&bl_en>;
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pwms = <&pwm0 0 1000000 0>;
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post-pwm-on-delay-ms = <10>;
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pwm-off-delay-ms = <10>;
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power-supply = <&backlight_regulator>;
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};
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panel: panel {
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compatible = "innolux,n116bge", "simple-panel";
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status = "okay";
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power-supply = <&panel_regulator>;
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backlight = <&backlight>;
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panel-timing {
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clock-frequency = <74250000>;
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hactive = <1366>;
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hfront-porch = <136>;
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hback-porch = <60>;
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hsync-len = <30>;
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hsync-active = <0>;
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vactive = <768>;
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vfront-porch = <8>;
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vback-porch = <12>;
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vsync-len = <12>;
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vsync-active = <0>;
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};
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ports {
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panel_in: port {
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panel_in_edp: endpoint {
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remote-endpoint = <&edp_out_panel>;
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};
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};
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};
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};
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};
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&edp {
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status = "okay";
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pinctrl-names = "default";
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pinctrl-0 = <&edp_hpd>;
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ports {
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edp_out: port@1 {
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reg = <1>;
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#address-cells = <1>;
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#size-cells = <0>;
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edp_out_panel: endpoint@0 {
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reg = <0>;
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remote-endpoint = <&panel_in_edp>;
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};
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};
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};
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};
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&edp_phy {
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status = "okay";
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};
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&pwm0 {
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status = "okay";
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};
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&vopl {
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status = "okay";
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};
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&vopl_mmu {
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status = "okay";
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};
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&pinctrl {
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backlight {
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bl_pwr_en: bl_pwr_en {
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rockchip,pins = <2 RK_PB4 RK_FUNC_GPIO &pcfg_pull_none>;
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};
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bl_en: bl-en {
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rockchip,pins = <7 RK_PA2 RK_FUNC_GPIO &pcfg_pull_none>;
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};
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};
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lcd {
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lcd_enable_h: lcd-en {
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rockchip,pins = <7 RK_PB6 RK_FUNC_GPIO &pcfg_pull_none>;
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};
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avdd_1v8_disp_en: avdd-1v8-disp-en {
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rockchip,pins = <2 RK_PB5 RK_FUNC_GPIO &pcfg_pull_none>;
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};
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};
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};
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