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STM32MP1) How to add HDMI extra mode?

hochul yoo
Associate III

Hello everyone ~

My custom board has RGB(LTDC) and HDMI display interfaces. 

We want to display same screen on same time.(duplicate mode)

So, LTDC interface connected to local LCD and HDMI transmitter(sii9022).

&ltdc node of my dts is below ..

	pinctrl-names = "default", "sleep";
	pinctrl-0 = <&ltdc_pins_mx>;
	pinctrl-1 = <&ltdc_sleep_pins_mx>;
	status = "okay";
	/* USER CODE BEGIN ltdc */
    port {
		#address-cells = <1>;
		#size-cells = <0>;
        ltdc_ep0_out: endpoint@0 {
			reg = <0>;			
            remote-endpoint = <&sii9022_in>;
	/* USER CODE END ltdc */

and we can display both screen successfully as below picture. 

0693W00000QNNNwQAP.pngHowever, unfortunately my LCD`s resolution is 1280x800.

and linux platform doesn't have this HDMI resolution mode.

so my LCD was displayed as below...

0693W00000QNNOQQA5.pngTherefore, I want to add 1280x800 mode to HDMI. 

Is there any guide article on wiki?

Thanks a lot !!!

hochul yoo
Associate III

My clock configuration was problem.

Below linked question was very helpful to me, thanks.​