MIPI-DSI

* How to Enable MIPI Module

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1. Driver Compile
Ensure below configures have been selected:

<code>CONFIG_ROCKCHIP_DW_MIPI_DSI=y</code>

Bellow drivers have been compiled:

<code>drivers/gpu/drm/rockchip/dw-mipi-dsi.c</code>

2. DTS Setting
2.1 Enable MIPI Device Node：

• Include the SoC DTS 'rk3288.dtsi' file.
• Set the MIPI device node state to 'okay'.

<code>include "rk3288.dtsi"
&mipi_dsi {
        status = "okay";
};</code>

2.2 MIPI device node parameters, there're only one property for MIPI device:

<code>&mipi_dsi {
        panel {
                compatible ="boe,tv080wum-nl0";
                reg = <0>;
                backlight = <&backlight>;
                enable-gpios = <&gpio1 13 GPIO_ACTIVE_HIGH>;
                status = "okay";
        };
};</code>

• "panel": Define the right panel device node.

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* How To Debug MIPI Module

3. Whether MIPI display card has been registered successfully

If the MIPI display card has been created, it would create a sysfs debug directory.

<code>$ ls /sys/class/drm/card0-DSI-1</code>

So you just need to check that directory. If that directory is missing in your machine board, please check:

• Whether MIPI have been enabled in DTS files.
• Whether MIPI panel have been registered successfully.
• Whether you have available VOP module for MIPI.
• Check the kernel log for more detail (dmesg | grep mipi)

4. Check MIPI display card status: status, enabled, modes

<code>$ cd /sys/class/drm/card0-DSI-1
$ cat status  # should printed "connected" or "disconnected"
$ cat enabled # should printed "enabled" or "disabled"
$ cat modes   # should printed the available mode list, like 1536x2048</code>

5. If you still have no picture on MIPI panel, please check bellow information:

• Check the MIPI panel power supply.
• Check the panel datasheet, ensure you have configured the timing and power sequence rightly.
• Check the hardware connected status, or test the panel on workable board.

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* Reference MIPI DTS Configure：

<code>include "rk3288.dtsi"

&mipi_dsi {
        status = "okay";
        panel {
                compatible ="boe,tv080wum-nl0";
                reg = <0>;
                backlight = <&backlight>;
                enable-gpios = <&gpio1 13 GPIO_ACTIVE_HIGH>;
                status = "okay";
        };
};</code>