MIPI DSI bus turnaround collision

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MIPI DSI bus turnaround collision

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emilmyhrman
Contributor IV


Hello,

We're using a MIPI DSI display (controller is ili9488) with imx6dl and are experiencing problems reading registers from the display. After the read command has been sent by imx6 a bus turnaround is also sent, the display then starts to transmit, but it seems as the imx6 then also transmit at the same time, causing a bus contention.

bus turnaround with collision 2.png

Any ideas of what is causing the imx6 to transmit at the same moment as display?

Is there some timeout in imx side causing this? Can the time be extended.

The driver is based on mxcfb_hx8369_wvga.c on Linux 3.14.

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Yuri
NXP TechSupport
NXP TechSupport

Hello,

  You may apply to i.MX6 Platform SDK to check and test

MIPI DSI operations in stand alone environment. Please refer to

Chapter 23 (Configuring the MIPI DSI driver) of "iMX6_Firmware_Guide.pdf"

in SDK documentation.

Have a great day,
Yuri

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emilmyhrman
Contributor IV

Hi Yuri,

I can't seem to find the platform sdk anywhere, only thing I could find about it was this post saying it's not supported anymore (https://community.freescale.com/thread/381335​ ).

Regards,

Emil

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Yuri
NXP TechSupport
NXP TechSupport

You may create request How to submit a new question for NXP Support
or let me know Your e-mail to forward  the SDK.

~Yuri.

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