The backlight does not work correctly with the current display panel
configuration: It works after boot, but once the display gets disabled it
is not possible to get it back on. It turns out that the ATNA45AF01 panel
needs exactly the same non-standard power sequence as implemented by the
panel-samsung-atna33xc20 driver for sc7180-trogdor-homestar.
Switch the panel in the DT to the new compatible and make two more changes
to make it work correctly:
1. Add the missing GPIO for the panel EL_ON3 line (EDP_BL_EN on CRD and
enable-gpios in the DT).
2. Drop the regulator-always-on for the panel regulator. The panel does
not seem to power off properly if the regulator stays on.
Signed-off-by: Stephan Gerhold <stephan.gerhold@xxxxxxxxxx>
---
arch/arm64/boot/dts/qcom/x1e80100-crd.dts | 17 +++++++++++++++--
1 file changed, 15 insertions(+), 2 deletions(-)
diff --git a/arch/arm64/boot/dts/qcom/x1e80100-crd.dts b/arch/arm64/boot/dts/qcom/x1e80100-crd.dts
index 6152bcd0bc1f..7d6800dd9b8a 100644
--- a/arch/arm64/boot/dts/qcom/x1e80100-crd.dts
+++ b/arch/arm64/boot/dts/qcom/x1e80100-crd.dts
@@ -268,7 +268,6 @@ vreg_edp_3p3: regulator-edp-3p3 {
pinctrl-0 = <&edp_reg_en>;
pinctrl-names = "default";
- regulator-always-on;
regulator-boot-on;
};
@@ -724,9 +723,13 @@ &mdss_dp3 {
aux-bus {
panel {
- compatible = "edp-panel";
+ compatible = "samsung,atna45af01";
+ enable-gpios = <&pmc8380_3_gpios 4 GPIO_ACTIVE_HIGH>;
power-supply = <&vreg_edp_3p3>;
+ pinctrl-0 = <&edp_bl_en>;
+ pinctrl-names = "default";
+
port {
edp_panel_in: endpoint {
remote-endpoint = <&mdss_dp3_out>;
@@ -785,6 +788,16 @@ &pcie6a_phy {
status = "okay";
};
+&pmc8380_3_gpios {
+ edp_bl_en: edp-bl-en-state {
+ pins = "gpio4";
+ function = "normal";
+ power-source = <1>; /* 1.8V */
+ input-disable;
+ output-enable;
+ };
+};
+
&qupv3_0 {
status = "okay";
};
--
2.44.1
