Hi, > >> Kroah-Hartman; Subbrathnam, Swaminathan > >> Subject: Re: [PATCH 2/2 v2] USB: musb: disable double buffering for > older > >> RTL versions > >> > >> On Tue, Apr 06, 2010 at 01:46:29PM +0200, ext Gadiyar, Anand wrote: > >> >With g_zero, do you see a hang or do you have data corruption? > >> > >> data corruption. But with our internal mode1 changes, we can use double > >> buffering with rtl1.8 on omap36xx, so at least rtl1.8 can work. > > > >Felipe, > > > >Have you ensured using either first 8K or second 8K of FIFO space > >in your double buffering tests for OMAP35x? > > don't remember right now. But I can only remember seeing that errata on > 36xx not 34xx/35xx. Can you confirm that. Yes, this issue is valid for OMAP34x/35x also. I have verified double Buffering on OMAP3EVM with FIFO space of first 8K and didn't see any issue. Can you test this on your end and confirm ? We would require reverting this Patch which is already merged in mainline. > > >I think you are aware of a known issue on OMAP35x where two active > >endpoints have to use FIFO either in first 8K or next 8K range. I think > >double > >buffering data corruption issue is linked to this known issue and can > >be > >avoided if we use FIFO space of first 8K or next 8K. > > problem with this is the endpoint limitation. We would have to cope with > that if we want mode1 + dbuf to work. We don't have any option due to the known errata on OMAP34x. Thanks, Ajay > > -- > balbi > -- > To unsubscribe from this list: send the line "unsubscribe linux-usb" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
