I replaced compatible with *"starry,kr070pe2t", "panel-simple"* and
DRM_PANEL_SIMPLE
is selected but still does not work.
I discovered that my display is LVDS. Do you know of any device tree
example to make a LVDS display work? I try use "panel-lvds" but I haven't
had success, the display doesn't even react.
Thanks Brandon
On Friday, December 8, 2023 at 5:08:38 AM UTC-3 fusibr...@gmail.com wrote:
> Hi Francisco,
>
> On Thursday, December 7, 2023 at 11:27:56 PM UTC+1 Francisco Ferreira
> wrote:
>
> Hi, guys. I'm trying to make the LCD screen of my A10 tablet work but I
> haven't had success. The screen is working when u-boot starts, I can see
> the boot logs on screen, but as soon as the kernel starts the screen
> stops and goes dark. The backlight is always on. The kernel log says "No
> panel or bridge found... RGB output disabled". Here is the boot logs
> related to the screen or DRM:
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> *franz@cubieboard:~$ dmesg | grep 'lcd\|panel\|drm'[ 0.092531] platform
> 1e40000.display-backend: Fixed dependency cycle(s) with
> /soc/lcd-controller@1c0d000/ports/port@0/endpoint@1[ 0.092636] platform
> 1e40000.display-backend: Fixed dependency cycle(s) with
> /soc/lcd-controller@1c0c000/ports/port@0/endpoint@1[ 0.093088] platform
> 1e60000.display-backend: Fixed dependency cycle(s) with
> /soc/lcd-controller@1c0d000/ports/port@0/endpoint@0[ 0.093175] platform
> 1e60000.display-backend: Fixed dependency cycle(s) with
> /soc/lcd-controller@1c0c000/ports/port@0/endpoint@0[ 0.095664] platform
> panel: Fixed dependency cycle(s) with
> /soc/lcd-controller@1c0c000/ports/port@1/endpoint@0[ 5.495129] sun4i-drm
> display-engine: bound 1e00000.display-frontend (ops 0xc0a991d0)[
> 5.503199] sun4i-drm display-engine: bound 1e20000.display-frontend (ops
> 0xc0a991d0)[ 5.511522] sun4i-drm display-engine: bound
> 1e60000.display-backend (ops 0xc0a98948)[ 5.519710] sun4i-drm
> display-engine: bound 1e40000.display-backend (ops 0xc0a98948)[
> 5.528244] sun4i-drm display-engine: bound 1c0c000.lcd-controller (ops
> 0xc0a96e08)[ 5.536626] sun4i-drm display-engine: No panel or bridge
> found... RGB output disabled[ 5.544546] sun4i-drm display-engine: bound
> 1c0d000.lcd-controller (ops 0xc0a96e08)[ 5.792091] [drm] Initialized
> sun4i-drm 1.0.0 20150629 for display-engine on minor 0[ 5.979251]
> sun4i-drm display-engine: [drm] fb0: sun4i-drmdrmfb frame buffer device[
> 10.856623] systemd[1]: Starting Load Kernel Module drm...[ 11.810514]
> systemd[1]: modp...@drm.service: Deactivated successfully.[ 11.837949]
> systemd[1]: Finished Load Kernel Module drm.[ 17.466606] [drm]
> Initialized lima 1.2.0 20200215 for 1c40000.gpu on minor 1*
>
> Here is my device tree. Did I write something wrong?
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> */dts-v1/;#include "sun4i-a10.dtsi"#include
> "sunxi-common-regulators.dtsi"#include <dt-bindings/gpio/gpio.h>#include
> <dt-bindings/input/input.h>#include
> <dt-bindings/interrupt-controller/irq.h>#include <dt-bindings/pwm/pwm.h>/ {
> model = "Topwise A721"; compatible = "topwise,a721", "allwinner,sun4i-a10";
> aliases { serial0 = &uart0; }; backlight: backlight { compatible =
> "pwm-backlight"; pwms = <&pwm 0 100000 PWM_POLARITY_INVERTED>; power-supply
> = <®_vbat>; enable-gpios = <&pio 7 7 GPIO_ACTIVE_HIGH>; /* PH7 */
> brightness-levels = <0 30 40 50 60 70 80 90 100>; default-brightness-level
> = <8>; }; chosen { stdout-path = "serial0:115200n8"; }; panel: panel {
> compatible = "starry,kr070pe2t";*
>
>
> The compatible should be *"starry,kr070pe2t", "panel-simple". *And make
> sure
> to select DRM_PANEL_SIMPLE=y.
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> * backlight = <&backlight>; power-supply = <®_lcd_power>; status =
> "okay"; port@0 { #address-cells = <1>; #size-cells = <0>; panel_input:
> endpoint@0 { reg = <0>; remote-endpoint = <&tcon0_out_panel>; }; }; };*
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> * reg_lcd_power: reg-lcd-power { compatible = "regulator-fixed";
> regulator-name = "reg-lcd-power"; gpio = <&pio 7 8 GPIO_ACTIVE_HIGH>; /*
> PH8 */ enable-active-high; }; reg_vbat: reg-vbat { compatible =
> "regulator-fixed"; regulator-name = "vbat"; regulator-min-microvolt =
> <3700000>; regulator-max-microvolt = <3700000>; };};&codec { status =
> "okay";};&pwm { pinctrl-names = "default"; pinctrl-0 = <&pwm0_pin>; status
> = "okay";};&tcon0 { pinctrl-names = "default"; pinctrl-0 =
> <&lcd_rgb666_pins>; status = "okay";};&tcon0_out { tcon0_out_panel:
> endpoint@0 { reg = <0>; remote-endpoint = <&panel_input>; };};&be0 { status
> = "okay";};&de { status = "okay";};*
> I appreciate any help. Thanks
>
>
> Cheers,
> Brandon.
>
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