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CC6 SBC parallel display with Linux/Yocto

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Hello everyone. I want to connect a rgb parallel display to my CC6 SBC. But i cant get a signal out of the corresponding ports/pins (disp0_dat0-23 ...).

I am using the pre built yocto 1.6 image and tried several boot configuration without success.

With the pre built android image a pixclock and data changes were measurable. But i need linux up and running with it.


edit: Solved, the IOMUX was the main cause of the problem.
asked Jun 22, 2015 in Linux by peppe New to the Community (2 points)
edited Jun 23, 2015 by peppe

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1 Answer

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Best answer
Here are the sample settings for the LCD as configured and tested by one of the customers:

Display-Name: ET0500G0DH6

U-boot:

video2=dev=lcd,CLAA-WVGA,if=RGB666

DeviceTree:

imx6q-ccimx6sbc-wbk.dts:

mxcfb3: fb@2 {
compatible = "fsl,mxc_sdc_fb";
disp_dev = "lcd";
interface_pix_fmt = "RGB666";
//mode_str ="CLAA_WVGA";
mode_str = "ET0500G0DH6";
default_bpp = <16>;
int_clk = <0>;
late_init = <0>;
status = "okay";
};

lcd@0 {
compatible = "fsl,lcd";
ipu_id = <0>;
disp_id = <0>;
default_ifmt = "RGB666";
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_ipu1_1>;
//display = <&claa>;
display = <&et0500g0dh6>;
status = "okay";
};

et0500g0dh6: ET0500G0DH6@0 {
display-timings {
timing {
clock-frequency = <29500000>;
hactive = <800>;
vactive = <480>;
hfront-porch = <24>;
hback-porch = <96>;
hsync-len = <72>;
vback-porch = <3>;
vfront-porch = <10>;
vsync-len = <7>;
};
};
};

imx6qdl.dtsi:

ipu1 {
pinctrl_ipu1_1: ipu1grp-1 {
fsl,pins = <
MX6QDL_PAD_DI0_DISP_CLK__IPU1_DI0_DISP_CLK 0x10
MX6QDL_PAD_DI0_PIN15__IPU1_DI0_PIN15 0x10
MX6QDL_PAD_DI0_PIN2__IPU1_DI0_PIN02 0x10
MX6QDL_PAD_DI0_PIN3__IPU1_DI0_PIN03 x10
MX6QDL_PAD_DI0_PIN4__GPIO4_IO20 0x10 //0x80000000
MX6QDL_PAD_DISP0_DAT0__IPU1_DISP0_DATA00 0x10
MX6QDL_PAD_DISP0_DAT1__IPU1_DISP0_DATA01 0x10
MX6QDL_PAD_DISP0_DAT2__IPU1_DISP0_DATA02 0x10
MX6QDL_PAD_DISP0_DAT3__IPU1_DISP0_DATA03 0x10
MX6QDL_PAD_DISP0_DAT4__IPU1_DISP0_DATA04 0x10
MX6QDL_PAD_DISP0_DAT5__IPU1_DISP0_DATA05 0x10
MX6QDL_PAD_DISP0_DAT6__IPU1_DISP0_DATA06 0x10
MX6QDL_PAD_DISP0_DAT7__IPU1_DISP0_DATA07 0x10
MX6QDL_PAD_DISP0_DAT8__IPU1_DISP0_DATA08 0x10
MX6QDL_PAD_DISP0_DAT9__IPU1_DISP0_DATA09 0x10
MX6QDL_PAD_DISP0_DAT10__IPU1_DISP0_DATA10 0x10
MX6QDL_PAD_DISP0_DAT11__IPU1_DISP0_DATA11 0x10
MX6QDL_PAD_DISP0_DAT12__IPU1_DISP0_DATA12 0x10
MX6QDL_PAD_DISP0_DAT13__IPU1_DISP0_DATA13 0x10
MX6QDL_PAD_DISP0_DAT14__IPU1_DISP0_DATA14 0x10
MX6QDL_PAD_DISP0_DAT15__IPU1_DISP0_DATA15 0x10
MX6QDL_PAD_DISP0_DAT16__IPU1_DISP0_DATA16 0x10
MX6QDL_PAD_DISP0_DAT17__IPU1_DISP0_DATA17 0x10
MX6QDL_PAD_DISP0_DAT18__IPU1_DISP0_DATA18 0x10
MX6QDL_PAD_DISP0_DAT19__IPU1_DISP0_DATA19 0x10
MX6QDL_PAD_DISP0_DAT20__IPU1_DISP0_DATA20 0x10
MX6QDL_PAD_DISP0_DAT21__IPU1_DISP0_DATA21 0x10
MX6QDL_PAD_DISP0_DAT22__IPU1_DISP0_DATA22 0x10
MX6QDL_PAD_DISP0_DAT23__IPU1_DISP0_DATA23 0x10
>;
};

The trick was to change settings in file imx6qdl.dtsi.
Last thing that had to be done was to change: MX6QDL_PAD_DI0_PIN4__IPU1_DI0_PIN04
to MX6QDL_PAD_DI0_PIN4__GPIO4_IO20 because i need 0 Volt for Brightness Control for LED Backlight.
answered Jun 23, 2015 by LeonidM Veteran of the Digi Community (3,556 points)
selected Jun 24, 2015 by peppe
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