topic Re: IMX8MQ Uboot cannot read or write the MIPI DSI register in i.MX Processors

IMX8MQ Uboot cannot read or write the MIPI DSI register

Dio_HUI — Wed, 30 Sep 2020 09:21:57 GMT

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

Re: IMX8MQ Uboot cannot read or write the MIPI DSI register

igorpadykov — Wed, 30 Sep 2020 10:48:07 GMT

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_v2019.04_5.4.3_2.0.0

Best regards
igor

Re: IMX8MQ Uboot cannot read or write the MIPI DSI register

coindu — Fri, 09 Oct 2020 03:20:27 GMT

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？

Re: IMX8MQ Uboot cannot read or write the MIPI DSI register

Dio_HUI — Mon, 12 Oct 2020 02:12:57 GMT

Hi igorpadykov

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

Best regards
Dio_HUI

Re: IMX8MQ Uboot cannot read or write the MIPI DSI register

my_name_lyl — Wed, 19 May 2021 09:30:30 GMT

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)