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Question, how to fix USB speed into 'full', i.MX6Q

Question asked by Masamichi Miyamoto on Dec 20, 2017
Latest reply on Dec 27, 2017 by Artur Petukhov

Dear team,

 

My customer is using i.MX6Q and their software is based on Linux(L 3.14.28).

My customer is trying to reduce communication speed of USB to 12MBps(Full-speed).

They want to fix the speed to ‘full-speed’ due to its anti-noise capability.

They have wrote the followings into &usbhi and &usbotg in DTSI file, but the speed was still ‘hi speed(480Mbps)’.

maximum-speed=”full-speed”

 

Could you show me how to fix the speed into ‘full-speed’?

And could show me why the speed does not fix to full-speed when they wrote as above?

 

Actually, they have achieved by modifying usb/chipidea/core.c file.

But they still need to know the way they did is right.

 

Thanks,

Miyamoto

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