I’m trying to enable the MIPI-DSI (display) interface on my Rockchip RK3399 (ARM64 arch) based board and I keep encountering the same error even after trying several things with the device tree. The OS is a fork of Ubuntu Bionic. Here is the kernel. Here is the error:

  [    1.195557] dw-mipi-dsi ff968000.dsi: can't request region for resource [mem 0xff968000-0xff96ffff]   [    1.196387] dw-mipi-dsi: probe of ff968000.dsi failed with error -16 

The error is 16 EBUSY, but I’m not sure what that means. Here are the edits I made to the device tree:

 &dsi {   status = "okay";  };  &dsi1 {    status = "okay"; };  &route_dsi {    status="okay";  };   &dsi_in_vopl {     status = "okay"; }; 

And here is the original DSI definition:

dsi: dsi@ff960000 {      compatible = "rockchip,rk3399-mipi-dsi";      reg = <0x0 0xff960000 0x0 0x8000>;      interrupts = <GIC_SPI 45 IRQ_TYPE_LEreg = <0x0 0xff960000 0x0 0x8000>;VEL_HIGH 0>;      clocks = <&cru SCLK_DPHY_PLL>, <&cru PCLK_MIPI_DSI0>,           <&cru SCLK_DPHY_TX0_CFG>;      clock-names = "ref", "pclk", "phy_cfg";      power-domains = <&power RK3399_PD_VIO>;      resets = <&cru SRST_P_MIPI_DSI0>;      reset-names = "apb";      rockchip,grf = <&grf>;      status = "disabled";      #address-cells = <1>;      #size-cells = <0>;      ports {         port {             #address-cells = <1>;             #size-cells = <0>;              dsi_in_vopb: endpoint@0 {                 reg = <0>;                 remote-endpoint = <&vopb_out_dsi>;             };              dsi_in_vopl: endpoint@1 {                 reg = <1>;                 remote-endpoint = <&vopl_out_dsi>;             };         };     }; }; 

I think it has something to do with the fact that it’s requesting the memory 0xff968000-0xff96ffff is being probed, but the interface is only 0x8000 wide. In other words, 0xff968000 + 0x8000 < 0xff96ffff, so it’s probing memory it doesn’t have access to. But the definition includes the interface size (reg = <0x0 0xff960000 0x0 0x8000>;), so I don’t know how to debug this. These are the only changes I made to the tree, and these are the only relevant messages that show up in DSI.