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iMX6UL: How to change display refresh rate?

Question asked by Durmuş Kurtuluş on Dec 6, 2016
Latest reply on Dec 7, 2016 by igorpadykov

Hi,

 

I would like to adjust the display refresh rate in my custom iMX6UL board based on EVK board.

Device tree entry for lcdif:

&lcdif {
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_lcdif_dat
&pinctrl_lcdif_ctrl>;
display = <&display0>;
status = "okay";

display0: display {
bits-per-pixel = <16>;
bus-width = <24>;

display-timings {
native-mode = <&timing0>;
timing0: timing0 {
clock-frequency = <33300000>;
hactive = <800>;
vactive = <480>;
hfront-porch = <8>;
hback-porch = <4>;
hsync-len = <41>;
vback-porch = <2>;
vfront-porch = <4>;
vsync-len = <10>;
};
};
};
};

For imx6qdl, there is a mode_str parameter in mxcfb entries where we can adjust refresh rate like mode_str ="800x480M@60";

I don't see any fb entry for imx6ul where I can specify mode_str. I don't even know what refresh rate I'm using now. Maybe 60Hz by default?

 

How can I change this value?

 

Thanks.

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