Re: usb : mass storage : short_not_ok for non usb3 udc

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On Thu, 26 Jul 2012, Felipe Balbi wrote:

> > > > > > > Maybe while bringing it back you can remove the checks for SuperSpeed.
> > > > > > > Is there any reason to keep them?

> > > Okay, that's fine.  But it doesn't answer my earlier question: Is there
> > > really any need for the SuperSpeed checks in this patch?
> > > 
> > > In other words, will DWC3 continue to work correctly if short_not_ok is
> > > set?
> > 
> > Ah, sorry, I missed that.
> > 
> > I think so, I don't think the DWC3 driver looks at the short-not-ok flag.
> > But I haven't looked at that driver for a while, so we had better ask
> > Felipe.
> > 
> > Felipe? What do you say?
> 
> We don't use the short_not_ok at all, that's correct. As long as OUT
> transfers are always aligned on wMaxPacketSize (no matter which speed)
> DWC3 will continue to work.

That's very clear.  So Rajaram, when you redo the patch you can simply
leave out the checks for SuperSpeed.  Set or clear the short_not_ok
flag depending only on the size of the bulk transfer, regardless of the
speed.

Alan Stern

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