octeon-usb and dwc2 in staging are for the same hw

Aaro Koskinen aaro.koskinen at iki.fi
Sun Aug 18 11:40:40 UTC 2013


On Sat, Aug 17, 2013 at 08:44:18PM +0000, Paul Zimmerman wrote:
> > It doesn't get very far:
> > 
> > 	External DMA Mode not supported
> > 	dwc2_hcd_init() FAILED, returning -22
> Hi Greg, all,
> After taking a look at the Octeon driver, it looks like that controller
> uses a customized version of the DWC2 core - it has a different DMA
> engine than the one provided by the standard hardware. So in fact these
> two drivers are actually not "for the same hw".

FWIW, I also tried forcing the DWC2 to non-DMA/FIFO mode, but could
not get that working either. Do you support any HW running in slave
mode? It seems the RX direction fails. I noticed the dwc2_read_packet()
is hard-coded to channel 0 which looks odd, but changing that didn't
change anything.


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