I have a custom board based on am3358, and I got a LCD screen connected to it.
I tried linux kernel with version 4.4.93, and the LCD screen works fine, but while I am using kernel v5.9, the LCD screen doesn't work.
My dts configure in linux v5.9 is as below:
&lcdc {
status = "okay";
blue-and-red-wiring = "legacy";
port {
lcdc_0: endpoint@0 {
remote-endpoint = <&panel_0>;
};
};
};
panel {
compatible = "ti,tilcdc,panel";
pinctrl-names = "default";
pinctrl-0 = <&lcd_pins_default>;
backlight = <&lcd_bl>;
enable-gpios = <&gpio3 20 GPIO_ACTIVE_HIGH>;
panel-info {
ac-bias = <255>;
ac-bias-intrpt = <0>;
dma-burst-sz = <16>;
bpp = <24>;
fdd = <0x80>;
sync-edge = <0>;
sync-ctrl = <1>;
raster-order = <0>;
fifo-th = <0>;
};
display-timings {
native-mode = <&timing0>;
timing0: 1360x768 {
hactive = <1360>;
vactive = <768>;
hback-porch = <86>;
hfront-porch = <86>;
hsync-len = <22>;
vback-porch = <24>;
vfront-porch = <24>;
vsync-len = <50>;
clock-frequency = <75000000>;
hsync-active = <0>;
vsync-active = <0>;
de-active = <1>;
pixelclk-active = <1>;
};
};
port {
panel_0: endpoint@0 {
remote-endpoint = <&lcdc_0>;
};
};
};
lcd_pins_default: lcd_pins_default {
pinctrl-single,pins = <
0x20 (PIN_OUTPUT | MUX_MODE1) /* gpmc_ad8.lcd_data23 */
0x24 (PIN_OUTPUT | MUX_MODE1) /* gpmc_ad9.lcd_data22 */
0x28 (PIN_OUTPUT | MUX_MODE1) /* gpmc_ad10.lcd_data21 */
0x2c (PIN_OUTPUT | MUX_MODE1) /* gpmc_ad11.lcd_data20 */
0x30 (PIN_OUTPUT | MUX_MODE1) /* gpmc_ad12.lcd_data19 */
0x34 (PIN_OUTPUT | MUX_MODE1) /* gpmc_ad13.lcd_data18 */
0x38 (PIN_OUTPUT | MUX_MODE1) /* gpmc_ad14.lcd_data17 */
0x3c (PIN_OUTPUT | MUX_MODE1) /* gpmc_ad15.lcd_data16 */
0xa0 (PIN_OUTPUT | MUX_MODE0) /* lcd_data0.lcd_data0 */
0xa4 (PIN_OUTPUT | MUX_MODE0) /* lcd_data1.lcd_data1 */
0xa8 (PIN_OUTPUT | MUX_MODE0) /* lcd_data2.lcd_data2 */
0xac (PIN_OUTPUT | MUX_MODE0) /* lcd_data3.lcd_data3 */
0xb0 (PIN_OUTPUT | MUX_MODE0) /* lcd_data4.lcd_data4 */
0xb4 (PIN_OUTPUT | MUX_MODE0) /* lcd_data5.lcd_data5 */
0xb8 (PIN_OUTPUT | MUX_MODE0) /* lcd_data6.lcd_data6 */
0xbc (PIN_OUTPUT | MUX_MODE0) /* lcd_data7.lcd_data7 */
0xc0 (PIN_OUTPUT | MUX_MODE0) /* lcd_data8.lcd_data8 */
0xc4 (PIN_OUTPUT | MUX_MODE0) /* lcd_data9.lcd_data9 */
0xc8 (PIN_OUTPUT | MUX_MODE0) /* lcd_data10.lcd_data10 */
0xcc (PIN_OUTPUT | MUX_MODE0) /* lcd_data11.lcd_data11 */
0xd0 (PIN_OUTPUT | MUX_MODE0) /* lcd_data12.lcd_data12 */
0xd4 (PIN_OUTPUT | MUX_MODE0) /* lcd_data13.lcd_data13 */
0xd8 (PIN_OUTPUT | MUX_MODE0) /* lcd_data14.lcd_data14 */
0xdc (PIN_OUTPUT | MUX_MODE0) /* lcd_data15.lcd_data15 */
0xe0 (PIN_OUTPUT | MUX_MODE0) /* lcd_vsync.lcd_vsync */
0xe4 (PIN_OUTPUT | MUX_MODE0) /* lcd_hsync.lcd_hsync */
0xe8 (PIN_OUTPUT | MUX_MODE0) /* lcd_pclk.lcd_pclk */
0xec (PIN_OUTPUT | MUX_MODE0) /* lcd_ac_bias_en.lcd_ac_bias_en */
>;
};
In kernel 4.4.93, the dts is almost the same as above, except for the port node in lcdc and panel.
In kernel v5.9, there's even no pixelclk output.
the dmesg is as below:
# dmesg | grep lcdc [ 2.158118] tilcdc-panel panel: GPIO lookup for consumer enable [ 2.158127] tilcdc-panel panel: using device tree for GPIO lookup [ 2.158191] tilcdc-panel panel: found enable GPIO # dmesg | grep panel [ 2.158118] tilcdc-panel panel: GPIO lookup for consumer enable [ 2.158127] tilcdc-panel panel: using device tree for GPIO lookup [ 2.158160] of_get_named_gpiod_flags: parsed 'enable-gpios' property of node '/panel[0]' - status (0) [ 2.158191] tilcdc-panel panel: found enable GPIO
By the way, my kernel is cloned from git://git.ti.com/ti-linux-kernel/ti-linux-kernel.git
Any help or advice is appreciated!
