topic Re: iMX8MP MIPI DSI Commands Timing Out in i.MX Processors

iMX8MP MIPI DSI Commands Timing Out

liamsul42 — Thu, 10 Aug 2023 19:28:13 GMT

Hello,

I am running into an issue when trying to send MIPI DSI initialization commands from a iMX8MP to a ST7701S Panel Driver on a ER-TFT040-2 LCD Panel. After attaching to the bridge, I am attempting to send the initialization commands, but get the error "mipi_dsi: wait payload tx done time out" on every single one of the commands. This is also causing the board to not boot as the Kernel panics with the error "Kernel panic - not syncing: Asynchronous SError Interrupt." I have included my ST7701S panel driver and kernel log as apart of this, any solutions or help would be greatly appreciated!

Re: iMX8MP MIPI DSI Commands Timing Out

Bio_TICFSL — Fri, 11 Aug 2023 14:46:32 GMT

Hello,

such exceptions can be due to memory errors, one can run ddr test and

rebuild image.

https://community.nxp.com/docs/DOC-340179

Also please check that you did not copied some binaries from previous builds

or other kernel revisions. Recommended fully rebuild image with modified sources.

Regards

Re: iMX8MP MIPI DSI Commands Timing Out

liamsul42 — Fri, 11 Aug 2023 17:23:53 GMT

Thank you for the feedback, however, this was not the issue.

I ended up finding what the issue was and in the ST7701 driver the initialization function was being called by the prepare function which was happening prior to the clock starting. Hence, the error because none of the tx bits were being removed from queue with the clock not active. Moving the initialization function to happen before the enable and after the clock was activated fixed it.

Re: iMX8MP MIPI DSI Commands Timing Out

liqing1 — Sun, 13 Aug 2023 03:14:43 GMT

hello liamsul42，I have the same situation, I tried several methods and it didn't work. could you tell me exactly how to move, thank you very much！

Re: iMX8MP MIPI DSI Commands Timing Out

liamsul42 — Mon, 14 Aug 2023 16:07:49 GMT

I was only getting this error due to the clock not running and not being able to clock out any bits from the FIFO queue that was sending the MIPI DSI commands. I would recommend ensuring that your clock is running and able to send out the packets/payloads from the FIFO queue.

Re: iMX8MP MIPI DSI Commands Timing Out

liqing1 — Tue, 15 Aug 2023 07:27:24 GMT

Thanks for your advice.I can get LPDT data with a logic analyzer, so the timeout is not important for me, I commented this code.

Re: iMX8MP MIPI DSI Commands Timing Out

Udhay_ — Wed, 20 Sep 2023 05:04:16 GMT

@liamsul42

Hi,

if i move st7701_init_sequence(st7701) this function to st7701_enable but it is streaming and not able to see the data

Can you please share the code to umoorthi@phoenix.tech

Re: iMX8MP MIPI DSI Commands Timing Out

H_Grobben — Tue, 27 Feb 2024 09:02:02 GMT

This did the trick for me, partially. Do get an image, but my vertical line count seems off, image is replicated 2.5 times vertically.

I also removed the IOVCC and VCC in the device tree..