On Wed, Jul 03, 2013 at 04:06:04PM +0300, Roger Quadros wrote: > On 07/03/2013 03:57 PM, Felipe Balbi wrote: > > Hi, > > > > On Tue, Jul 02, 2013 at 01:17:58PM -0400, Alan Stern wrote: > >> A PCI-based EHCI controller has two power sources: the core well (which > >> is turned off during suspend) and the auxiliary well (which remains > >> powered). That's how remote wakeup works; it uses the auxiliary well. > > > > This, kinda, matches what OMAP tries to do with pad wakeup. Just that > > pad wakeup sits outside of the device itself. Perhaps we could look into > > how PCI handles the aux well and take some inspiration from there. > > > > Any pointers under drivers/pci/ would be great :-) > > > From what I understood, auxiliary well is just a power source, and it keeps > the EHCI controller powered even during suspend. > > If that is true then it is different from our situation as we power down the > EHCI controller completely. right but our "auxiliary well" keeps PRCM powered which can wake EHCI up ;-) What I'm saying is that from ehci-omap's perspective, there's very little difference, specially since we route the wakeup through the same IRQ line anyway. Perhaps we could take some inspiration from the PCI land to make our hwmod/omap_device a little easier from driver perspective. Or maybe it doesn't make sense ;-) -- balbi
Attachment:
signature.asc
Description: Digital signature
