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MIPI DSI bus turnaround collision

Question asked by Emil Myhrman on Mar 22, 2016
Latest reply on Apr 7, 2016 by Yuri Muhin


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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