On Tue, Aug 13, 2013 at 2:21 PM, Felipe Balbi <balbi@xxxxxx> wrote: > On Tue, Aug 13, 2013 at 01:11:47PM -0500, Bin Liu wrote: >> Sebastian, >> >> On Tue, Aug 13, 2013 at 12:38 PM, Sebastian Andrzej Siewior >> <bigeasy@xxxxxxxxxxxxx> wrote: >> > Since the musb-gadget code now calls the dma engine properly it is >> > possible to enable it for the TX path in device mode. >> > AM335x Advisory 1.0.13 says that we may lose the toggle bit on multiple >> > RX transfers. There is a workaround in host mode but none in device mode >> > and therefore RX transfers are disabled. >> 1.0.13 only presents in PG1.0. It has been fixed in PG2.x. Maybe we >> should check for silicon rev here? > > it would be quite difficult to check PG revision from this driver. It > would have to be passed as a flag through DT or something similar. To make the code logic simple, I would think to ignore the rev check and enable CPPI for RX in device mode. I think in theory the controller in device mode will never hit on this hw bug. Regards, -Bin. > > -- > 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
