OMAP L138 USB force full speed

Aníbal Pinto

I need to force USB on OMAP to work on full speed.

I have a device that don't work in high speed and the driver don't try the full speed after high speed fail.

On wiki page [1] show the commands, I think that the directory structure was changed since last wiki edit, to force full speed :

echo "force full-speed" > /sys/kernel/debug/musb/testmode

I unplug the device and plug it again and the driver retries again with full speed.

On datasheet sprufm8h Universal Serial Bus 2 on section 4.3 it says that register FORCE_FS will force the USB controller after a USB Reset.

This USB reset is the reconnection of the device ? Or need to send an extra command ?

Thanks.

Regards,

Aníbal

[1] - http://processors.wiki.ti.com/index.php/Usbgeneralpage#To_force_musb_to_full-speed

over 13 years ago

0 Aníbal Pinto over 13 years ago

Intellectual 900 points

Modifying the driver [1] I was able to force full speed.

But anyone knows if musb debugfs interface works ?

Thanks.

[1] - http://linux.omap.com/pipermail/davinci-linux-open-source/2010-January/017743.html

0 Ajay over 13 years ago in reply to Aníbal Pinto

TI__Genius 9460 points

Anibal.

The debugfs discuss about putting the controller in "force full speed" as defined in USB TESTMODE. This is required for hardware certification and not intended for functional use. You should be changing the driver as you have already done.

Ajay

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OMAP L138 USB force full speed