On 03/03/14 16:11, Marc Murphy wrote: > Hi Igor > > The Hub is a Microchip USB2513B-AEZG and is connected to EHCI controller port via the DUP_P and DUP_N pins. There is a reset applied to the chip at power on. > If the reset signal is sw controllable, you might want to toggle it before the EHCI controller resumes. There is also a USB phy on the way from EHCI controller to the hub. You might also want to check if the phy resumes correctly. Which phy do you use and how is it reset? > Regards > Marc > ________________________________________ > From: Igor Grinberg [grinberg@xxxxxxxxxxxxxx] > Sent: 03 March 2014 12:16 > To: Roger Quadros; Marc Murphy; linux-omap@xxxxxxxxxxxxxxx > Subject: Re: Help needed USB hub disconnected at resume > > On 03/03/14 13:06, Roger Quadros wrote: >> Hi Marc, >> >> On 03/03/2014 12:04 PM, Marc Murphy wrote: >>> Hi, >>> I am using the latest stable 3.4.80 kernel with some changes to get the EMAC Phy to initialise correctly after a suspend/resume. The platform is AM3517 with most of the system working nice and smoothly. I have 1 issue though and need some advice/help to get the system to use the USB hub I have connected to the EHCI controller after a suspend to memory and resume. >>> >>> At boot all is recognised; >>> >>> [ 1.486816] usbcore: registered new interface driver cdc_ether >>> [ 1.493255] usbcore: registered new interface driver cdc_ncm >>> [ 1.499450] usbcore: registered new interface driver qmi_wwan >>> [ 1.506622] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver >>> [ 1.513580] ehci-omap.0 supply hsusb0 not found, using dummy regulator >>> [ 2.521881] ehci-omap ehci-omap.0: OMAP-EHCI Host Controller >>> [ 2.528411] ehci-omap ehci-omap.0: new USB bus registered, assigned bus number 1 >>> [ 2.536468] ehci-omap ehci-omap.0: irq 77, io mem 0x48064800 >>> [ 2.553070] ehci-omap ehci-omap.0: USB 2.0 started, EHCI 1.00 >>> [ 2.559295] usb usb1: New USB device found, idVendor=1d6b, idProduct=0002 >>> [ 2.566436] usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1 >>> [ 2.574035] usb usb1: Product: OMAP-EHCI Host Controller >>> [ 2.579620] usb usb1: Manufacturer: Linux 3.4.80 ehci_hcd >>> [ 2.585296] usb usb1: SerialNumber: ehci-omap.0 >>> [ 2.591278] hub 1-0:1.0: USB hub found >>> [ 2.595306] hub 1-0:1.0: 3 ports detected >>> >>> And I can see everything OK. >>> >>> # lsusb >>> Bus 001 Device 002: ID 0424:2513 Standard Microsystems Corp. 2.0 Hub >>> Bus 002 Device 002: ID 05e3:0718 Genesys Logic, Inc. IDE/SATA Adapter >>> Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub >>> Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub >>> Bus 001 Device 003: ID 1199:68a2 Sierra Wireless, Inc. >>> # >>> # >>> # echo mem > /sys/power/state >>> [ 73.736572] PM: Syncing filesystems ... done. >>> [ 73.743530] Freezing user space processes ... (elapsed 0.01 seconds) done. >>> [ 73.766784] Freezing remaining freezable tasks ... (elapsed 0.02 seconds) done. >>> [ 73.959289] davinci_mdio davinci_mdio.0: timed out waiting for idle >>> [ 73.968872] PM: suspend of devices complete after 170.410 msecs >>> [ 73.975433] PM: late suspend of devices complete after 0.305 msecs >>> [ 73.982635] PM: noirq suspend of devices complete after 0.732 msecs >>> [ 83.430450] Powerdomain (core_pwrdm) didn't enter target state 1 >>> [ 83.436737] Could not enter target state in pm_suspend >>> [ 83.443176] PM: noirq resume of devices complete after 0.915 msecs >>> [ 83.450164] PM: early resume of devices complete after 0.274 msecs >>> [ 83.457336] <6>Waiting for PHY clock good... >>> [ 83.463287] davinci_mdio davinci_mdio.0: resetting idled controller >>> [ 83.471343] net eth0: attached PHY driver [SMSC LAN8710/LAN8720] (mii_bus:phy_addr=davinci_mdio-0:00, id=7c0f1) >>> [ 84.771881] PM: resume of devices complete after 1315.185 msecs >>> [ 84.778472] Restarting tasks ... >>> [ 84.782379] usb 1-1: USB disconnect, device number 2 >>> [ 84.790557] done. >>> [ 84.792938] mmc0: mmc_rescan_try_freq: trying to init card at 400000 Hz >>> sh: write error:[ 84.800781] usb 1-1.1: USB disconnect, device number 3 >>> Operation not p[ 84.808349] qmi_wwan 1-1.1:1.8: wwan0: unregister 'qmi_wwan' usb-ehci-omap.0-1.1, Sierra Wireless wwan/QMI device >>> ermitted >>> [ 84.859191] mmc1: mmc_rescan_try_freq: trying to init card at 400000 Hz >>> [ 86.490356] PHY: davinci_mdio-0:00 - Link is Up - 100/Full >>> # >>> # >>> # lsusb >>> Bus 002 Device 002: ID 05e3:0718 Genesys Logic, Inc. IDE/SATA Adapter >>> Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub >>> Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub >>> # >>> >>> Is there any relevant patch out there that would address the issue that I see ? >> >> Does this happen because of OFF mode? >> Can you please try the tests with off mode disabled? >> >> e.g. >> mount -t debugfs none /sys/kernel/debug >> echo 0 > /sys/kernel/debug/pm_debug/enable_off_mode >> suspend & resume > > AFAIK, AM3517 does not have OFF mode. > We had something similar with runtime pm... > It might be useful to know which hub is this and how is it connected... > >> >> Also please send the output of /sys/kernel/debug/pm_debug/count >> before suspend and after resume. Thanks. > > > > -- > Regards, > Igor. > -- Regards, Igor. -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
