i.MX ProcessorsのトピックRe: Issue with MIPI-DSI Connection on i.MX8M Plus - Framebuffer Not Created

Issue with MIPI-DSI Connection on i.MX8M Plus - Framebuffer Not Created

kuri — Wed, 21 Aug 2024 08:00:38 GMT

Dear NXP Support,

I am currently working on connecting an LCD display via MIPI-DSI using the i.MX8M Plus. The MIPI-DSI is directly connected to the CPU, and I am using the ST7701 LCD. However, I have encountered the following errors:

[drm:drm_bridge_attach] *ERROR* failed to attach bridge /soc@0/bus@32c00000/mipi_dsi@32e60000 to encoder DSI-34: -19 imx_sec_dsim_drv 32e60000.mipi_dsi: Failed to attach bridge: 32e60000.mipi_dsi imx_sec_dsim_drv 32e60000.mipi_dsi: failed to bind sec dsim bridge: -19

Additionally, the following message is also being output related to this error:

drm_dbg_kms: No connectors found, will not create framebuffer!

This error might be causing dev->mode_config.num_connector to remain at 0, which in turn is likely causing the above message to be output within the drm_fbdev_client_hotplug function, leading to a situation where the framebuffer is not created.

I have attached the device tree, configuration files, and dmesg logs I am using. I would appreciate any advice on potential solutions for this issue.

Thank you for your support.

Best regards,

Re: Issue with MIPI-DSI Connection on i.MX8M Plus - Framebuffer Not Created

Bio_TICFSL — Wed, 21 Aug 2024 14:18:54 GMT

Hello,

This issue is due to hardware is not connected or bad driver, besides you dmesg don't mark an error you have to fix the driver.

Regards

Re: Issue with MIPI-DSI Connection on i.MX8M Plus - Framebuffer Not Created

kuri — Thu, 22 Aug 2024 01:31:53 GMT

Hi. @Bio_TICFSL ,

Thank you for your answer.

Given that no errors are shown in the dmesg logs, it might indicate that the driver isn't functioning correctly and that there could be a missing configuration in the device tree. I suspect that it may be necessary to add information about the ST7701 to the mipi_dsi node. Is this addition required? If so, could you please provide any reference information that could assist?

&mipi_dsi

{

status = "okay";

}

Best regards,