> From: Wang, Yu Y [mailto:yu.y.wang@xxxxxxxxx] > Sent: Wednesday, August 14, 2013 8:09 PM > > > > From: Felipe Balbi [mailto:balbi@xxxxxx] > > > Sent: Tuesday, August 13, 2013 1:30 PM > > > > > > On Tue, Aug 13, 2013 at 08:04:26PM +0000, Paul Zimmerman wrote: > > > > > From: Felipe Balbi > > > > > Sent: Tuesday, August 13, 2013 12:20 PM > > > > > > > > > > On Mon, Aug 05, 2013 at 03:41:57PM +0000, Wang, Yu Y wrote: > > > > > > Hi Balbi, > > > > > > > > > > > > Please check the attached logs. The kernel base one kernel3.10. > > > > > > > > > > you didn't take the regdump after xHCI :-( I need to check if > > > > > erst_base is being mirrored to DEPCMDPAR* > > > > > > > > Hi Felipe, > > > > > > > > There seems to be some basic misunderstanding here. ALL versions of > > > > the Synopsys core share the internal RAM between device and host > > > > modes. So the only supported way of switching modes is to shut down > > > > the driver for the mode you are leaving, then start up the driver > > > > for the mode you are entering and re-initialize (most of) the registers. > > > > > > > > This is described in the databook in the OTG -> Software Flow and > > > > OTG -> Programming Model chapters. > > > > > > sure. > > > > > > > So whether a particular set of RAM-based registers is mirrored > > > > between modes does not matter. > > > > > > fair enough. > > > > > > > And I don't see what this has to do with hibernation? > > > > > > I have lost track of the conversation, probably. but I believe Yu > > > mentioned resetting the IP everytime when coming out of hibernation > > > and, for whatever reason, I confused myself with the other problem. > > > > OK :) > > > > By the way, I wanted to tell Yu that you (Felipe) are correct about not resetting > > the core when coming out of hibernation. That is definitely not required, and > > would probably break the resume from hibernation. I think we (Synopsys) > > should update the databook to mention that explicitly, since it is different from > > the normal initialization flow. > > > > -- > > Paul > > [Yu:] One question. If follow baili's design. When nothing connected, both host and device > Should under hibernation mode, right? That is mean U2PMU/U3PMU should be save > *two* copies of backup data respective for host and device mode, right? I don't > think the U2PMU/U3PMU have this capability. No. One of the modes will be disabled, depending on the state of the ID pin. So only the mode that is active will enter hibernation. And, if nothing is connected, there is no need to save the state data anyway. -- Paul -- 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
