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USB EHCI suspend/resume port issue

Raviraj Somnache1
Intellectual 430 points

Hi,

I am working on OMAP4470 based device and using kernel 3.0.31.
In this device modem is connected to OMAP by USB EHCI, we are facing issues while suspend resume, below are the details.
I request you to please help us to solve this issues.
1. Used kernel 3.0.31 + JB file system
2. OMAP4470 and modem is connected to OMAP by USB EHCI.
3. In kernel we are using serial generic driver.
4. I have implemented suspend/resume functions in usb serial generic driver.
5. Wake up event is enabled on data0 pin of USB port.
6. Normal suspend resume works fine but when device is in suspend state and call comes sometimes ports gets disconnects.
We are getting log "ehci-omap ehci-omap.0: resume root hub after power loss"

Below logs  displayed after that.
[ 1508.802917] CPU1: shutdown
[ 1508.804260] Resume caused by I/O pad: CONTROL_PADCONF_WAKEUPEVENT_2[5]
[ 1508.804260] PD_CORE curr=ON prev=ON logic=ON

[ 1508.804260] PD_L3_INIT curr=ON prev=ON logic=ON
[ 1508.804260] CD_L3_INIT mode=SW_SLEEP activity=0x2006100
[ 1508.804260] HSUSBHOST mode=DISABLED stbyst=STBY idlest=TRANSITION
[ 1508.804260] Powerdomain (core_pwrdm) didn't enter target state 1 Vs achieved state 3. current state 3
[ 1508.804260] Powerdomain (l3init_pwrdm) didn't enter target state 1 Vs achieved state 3. current state 3
[ 1508.804260] Could not enter target state in pm_suspend
[ 1508.804595] Enabling non-boot CPUs ...
[ 1508.821014] CPU1: Booted secondary processor
[ 1508.822967] CPU1 is up
[ 1508.824920] PM: early resume of devices complete after 1.892 msecs
[ 1508.826293] wakeup wake lock: itc-filter
[ 1508.827056] Switched to NOHz mode on CPU #1
[ 1508.926330] catalina-lcd_power_enable: on = 1
[ 1509.080627] tianma-tm040ydhp05 display0: panel revision 1 00.80.00
[ 1509.905578] PVR: PVRSRVDriverResume(pDevice=c78b2800)
[ 1509.905609] PVR: SysSystemPostPowerState: Entering state D0
[ 1509.905639] PVR: EnableSystemClocks: Enabling System Clocks
[ 1509.905670] PVR: Installing device LISR SGX ISR on IRQ 53 with cookie c72f1e00
[ 1509.906585] usb usb2: usb resume
[ 1509.915832] usb usb1: usb resume
[ 1509.915863] ehci-omap ehci-omap.0: ehci_omap_bus_resume
[ 1509.916229] ehci-omap ehci-omap.0: resume root hub after power loss
[ 1509.928649] hub 2-0:1.0: hub_resume
[ 1509.936462] in hpd work 0, state=0
[ 1509.959930] hub 1-0:1.0: hub_resume
[ 1509.959991] ehci-omap ehci-omap.0: GetStatus port:1 status 000000 0 ACK sig=se0
[ 1509.960021] hub 1-0:1.0: port 1: status 0000 change 0000
[ 1509.960052] ehci-omap ehci-omap.0: GetStatus port:2 status 000000 0 ACK sig=se0
[ 1509.960113] ehci-omap ehci-omap.0: GetStatus port:3 status 000000 0 ACK sig=se0
[ 1509.960266] ehci-omap ehci-omap.0: GetStatus port:1 status 000000 0 ACK sig=se0
[ 1509.960296] hub 1-0:1.0: port 1 status 0000.0000 after resume, -19
[ 1509.960327] usb 1-1: can't resume, status -19
[ 1509.960357] hub 1-0:1.0: logical disconnect on port 1
[ 1509.964477] PM: resume of devices complete after 1139.221 msecs
[ 1510.360809] PM: Finishing wakeup.
[ 1510.364685] Restarting tasks ...
[ 1510.368530] hub 2-0:1.0: state 7 ports 1 chg 0000 evt 0000

Please help us to resolve this issue.

Regards,

Raviraj