Integration of MIPI DSI Display with IMX8M Plus

[Nilesh_Bhavsar]

Hi,

Currently we are using the IMX8M Plus processor and trying to integrate the MIPI DSI Display of team source display company. The detailed hardware details as per below:

Processor part No: MIMX8ML8CVNKZAB
Display Model : TST055HDII-18C
Display company : Team source Display

We are using latest kernel version available on https://github.com/nxp-imx/linux-imx (If-6.12-y). We done all required setup in host machine which is configured with ubuntu 20.04. 

I checked the kernel source file but in that /drivers/gpu/drm/imx/imx_mipi_dsi.c file is missing. Can you please guide me for this?

Is this file is required for display integration? Currently we are dealing with panel-ilitek-ili9881c.c and imx8mp_evk.dts files.

Thanks in advance for your help!

[joanxie]

for mipi dsi display, current bsp support rm67191 and rm67199, you can refer to them and porting by yourself, for the dts file , you can refer

https://github.com/nxp-imx/linux-imx/blob/lf-6.12.y/arch/arm64/boot/dts/freescale/imx8mp-evk-rm67199...

https://github.com/nxp-imx/linux-imx/blob/lf-6.12.y/arch/arm64/boot/dts/freescale/imx8mp-evk-rm67191...

for the driver of panel, you can refer

https://github.com/nxp-imx/linux-imx/blob/lf-6.12.y/drivers/gpu/drm/panel/panel-raydium-rm67191.c

[sergeiposelenov]

Hello @joanxie, FYI it's very likely that the rm67191 panel reset GPIO1_IO8 doesn't work correctly, see in imx8mp-evk-rm67191.dts:

&mipi_dsi {
        panel@0 {
                compatible = "raydium,rm67191";
                reg = <0>;
                pinctrl-0 = <&pinctrl_mipi_dsi_en>;
                reset-gpio = <&gpio1 8 GPIO_ACTIVE_LOW>;
                dsi-lanes = <4>;
                video-mode = <2>;       /* 0: burst mode
                                         * 1: non-burst mode with sync event
                                         * 2: non-burst mode with sync pulse
                                         */
                panel-width-mm = <68>;
                panel-height-mm = <121>;
                status = "okay";
        };
};

The node misses "pinctrl-names = "default";". Without it, the pin is not configured as GPIO.

GPIO1_IO08 is already a GPIO, however the panel reset won't work for other pins (e.g. for GPIO1_IO23, as in my case. It took me a while to figure out why my panel doesn't respond to the commands.).

Please check.

The error is likely present for imx8mm and other boards as well.

Regards,

Sergei

[Nilesh_Bhavsar]

Hi Joanxie,

Thank you for your quick response.

Regarding the file /drivers/gpu/drm/imx/imx_mipi_dsi.c , is it necessary? I found online that this file is also required. 

Please guide me on this points as well.

[joanxie]

why do you think you need this file? I didn't find this in our bsp