Alan, On Mon, Oct 29, 2012 at 8:54 PM, Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> wrote: > On Mon, 29 Oct 2012, Mohan V wrote: > >> > I'm not going to be able to help very much with an Android kernel. >> > Does the same problem occur with a vanilla non-Android 3.6 kernel? If >> > it doesn't, that indicates the problem was caused by some >> > Android-specific changes. >> > >> With the vanilla 3.6 kernel, the device connected to OHCI port is not even >> detected. The below messages are seen: >> >> [ 5.343780] usb 2-2: new low-speed USB device number 5 using ohci-omap3 >> [ 5.351776] ohci-omap3 ohci-omap3.0: urb ee7f83c0 path 2 ep0out >> 5ec20000 cc 5 --> status -62 >> [ 5.570770] ohci-omap3 ohci-omap3.0: urb ee7f83c0 path 2 ep0out >> 5ec20000 cc 5 --> status -62 >> [ 5.789062] usb 2-2: device not accepting address 5, error -62 >> [ 5.795288] hub 2-0:1.0: unable to enumerate USB device on port 2 > > It looks like the device was detected just fine but the host was > unable to communicate with it. I don't know why; maybe a clock or > power line wasn't turned on properly or a PHY wasn't enabled. > >> We think it may not be hardware issue, since the device gets detected on >> android-3.0 kernel. The support for OHCI on OMAP4430 SDP board >> seems to be missing in Linux mainline (3.6). >> >> We ported some OMAP specific patches from android kernel, with this the >> device gets detected only if it is connected at boot. >> If the system is booted and then device is connected, it doesn't get detected. > > Doesn't get detected, or does get detected but then doesn't > communicate? > The device does not get detected. > Perhaps you should send some questions to the maintainers of the > various ohci-omap drivers or the Android maintainers. > Keshava, can you please comment? >> > Are you referring to this part of the log? >> > >> >> ------------------------Device not getting detected when connected--------------------------- >> >> >> >> / # [ 135.621002] usbhs_wakeup: Enabling clocks >> >> [ 135.625762] usbhs_runtime_resume:++++++ >> >> [ 135.630371] usbhs_runtime_resume:------ >> >> [ 135.638183] USB IO PAD Wakeup event triggered################## >> >> [ 135.644958] usbhs_runtime_suspend:++++++ >> >> [ 135.649749] usbhs_runtime_suspend:----- >> > >> > It appears that ohci_irq() didn't run. Did >> > ohci_finish_controller_resume() get called? >> > >> This function is not used in ohci-omap3.c and is used only in ohci-omap.c. >> Is it necessary to call this function? > > It is necessary if the driver supports suspend/resume. As far as I can > tell, the ohci-omap3 driver does not have this support (at least, not > in the 3.6 kernel) whereas the ohci-omap driver does. > > What driver produced the "usbhs_runtime_suspend" and > "usbhs_runtime_resume" messages above? (No such messages are present > in ohci-omap3.c.) Apparently that driver _does_ support > suspend/resume. > This driver is USBHS core driver for OMAP EHCI and OHCI (drivers/mfd/omap-usb-host.c) Thanks, Mohan -- 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
