IMX8MQ Uboot cannot read or write the MIPI DSI register

[Dio_HUI]

Our products use IMX8MQ, we hope to achieve MIPI DSI output display in the UBOOT phase. It was found that IMX8MQ could not read or write directly to the registers of the MIPI DSI, which would cause the direct chip reset and then enter the wireless loop.

In the uboot-imx/board/freescale/imx8mq_evk/imx8mq_evk.c,We tested reads and writes in the board_init function

[igorpadykov]

Hi Dio_HUI

for example one can look at uboot mipi-dsi driver

https://source.codeaurora.org/external/imx/uboot-imx/tree/drivers/video/mipi_dsi_northwest.c?h=imx_v...

Best regards
igor

[Dio_HUI]

Hi igorpadykov

I don't know which register the sim_base address in mipi_dsi_northwest.c points to

Best regards
Dio_HUI

[coindu]

hi： igorpadykov

    int mipi_dsi_northwest_setup(u32 base_addr, u32 sim_addr){

   dsi_info->sim_base = sim_addr;

}

   I donot know which register is match the sim_addr on i.MX8MQ platform, can you point it out？

[my_name_lyl]

IMX8MQ 的 mipi-dsi 的寄存器地址 is 0x30a00000 ,可以参考linux内核的设备树文件(dtb)