On Wed, 24 Mar 2010, Sriram V wrote: > Hi, > > 1) I use 2.6.29 Kernel. That's around a year old. You should use a newer kernel. > 2) I use a SMSC 3320 PHY to which a hub is connected. I have 2 devices > on the hub. My host is omap ehci. > 3) When i suspend-resume the usb device i get the error "I get an > error "PM: Device 1-2.2 failed to resume: error -19" > 4) I am not really sure why i get this - After resume, Both the > devices get re-enumerates and i can access them. > 5) To get it working on this PHY what i do i resume path is i reset > the PHY and then the HUB and i have disabled > CONFIG_USB_SUSPEND. Maybe you shouldn't reset the phy and the hub. Why do they need to be reset? Don't they get sufficient suspend power while the system is asleep? > 6) I have done phy and hub reset both in resume path of the ehci > resume of ehci-omap.c. Is there a better place to do hub reset in > suspend-resume? Even if you do need to reset the phy, you probably don't need to reset the hub. > 7) Also, I have applied a patch found at > http://e2e.ti.com/support/arm174_microprocessors/omap_applications_processors/f/42/p/29363/102101.aspx#102101 > > > However whats bothering me are the messages during suspend-resume. > Not sure why usb_dev_resume return -19. Undoubtedly it's because you reset the hub. That destroys the USB sessions, preventing the devices from resuming, and forcing them to re-enumerate instead. Alan Stern -- 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
