imx53qsb: usb remote wakeup

[warl0rd]

IMX53QSB  (LOCO) board runs the 2.6.35.3 Linux kernel. Telit GSM modem HE910-G via USB interface is connected to IMX53QSB. The modem is capable of remote wakeup. It has been tested with WindowsXP and succeeded to wake up a desktop with incoming call. With IMX53QSB the modem wakes the board up, but something goes wrong and  USB hub executes reset-resume instead of reset procedure thus resetting the device connected. Here is the log of suspend:

[ 220.253224] PM: Syncing filesystems ... done.

[ 220.267388] dvfs: disable dvfs before suspend

[ 220.275139] Freezing user space processes ... (elapsed 0.01 seconds) done.

[ 220.294546] Freezing remaining freezable tasks ... (elapsed 0.01 seconds) done.

[ 220.315993] usb 1-1: usb_suspend: ++

[ 220.319652] usb 1-1: choose_wakeup: msg.event 2 state 7 ++

[ 220.325301] usb 1-1: choose_wakeup dev->power.can_wakeup 1 dev->power.should_wakeup 1 w 1

[ 220.333674] usb 1-1: choose_wakeup: --

[ 220.337629] usb 1-1: usb_suspend_both: state 7 ++

[ 220.342477] usb 1-1: usb_suspend_interface: state 7 ++

[ 220.347848] usb 1-1: usb_suspend_interface: status 0 --

[ 220.353353] usb 1-1: usb_suspend_interface: state 7 ++

[ 220.358514] usb 1-1: usb_suspend_interface: status 0 --

[ 220.363862] usb 1-1: usb_suspend_interface: state 7 ++

[ 220.369094] usb 1-1: usb_suspend_interface: status 0 --

[ 220.375458] usb 1-1: usb_suspend_interface: state 7 ++

[ 220.380618] usb 1-1: usb_suspend_interface: status 0 --

[ 220.385963] usb 1-1: usb_suspend_interface: state 7 ++

[ 220.391121] usb 1-1: usb_suspend_interface: status 0 --

[ 220.396479] usb 1-1: usb_suspend_interface: state 7 ++

[ 220.401630] usb 1-1: usb_suspend_interface: status 0 --

[ 220.406967] usb 1-1: usb_suspend_interface: state 7 ++

[ 220.412130] usb 1-1: usb_suspend_interface: status 0 --

[ 220.417454] usb 1-1: usb_suspend_interface: state 7 ++

[ 220.422617] usb 1-1: usb_suspend_interface: status 0 --

[ 220.427981] usb 1-1: usb_suspend_interface: state 7 ++

[ 220.433137] usb 1-1: usb_suspend_interface: status 0 --

[ 220.438451] usb 1-1: usb_suspend_interface: state 7 ++

[ 220.443605] usb 1-1: usb_suspend_interface: status 0 --

[ 220.448918] usb 1-1: usb_suspend_interface: state 7 ++

[ 220.454071] usb 1-1: usb_suspend_interface: status 0 --

[ 220.459384] usb 1-1: usb_suspend_interface: state 7 ++

[ 220.464536] usb 1-1: usb_suspend_interface: status 0 --

[ 220.469849] usb 1-1: usb_suspend_interface: state 7 ++

[ 220.476481] usb 1-1: usb_suspend_interface: status 0 --

[ 220.481815] usb 1-1: usb_suspend_interface: state 7 ++

[ 220.486955] usb 1-1: usb_suspend_interface: status 0 --

[ 220.492283] usb 1-1: usb_suspend_device: do_remote_wakeup 1 state 7 ++

[ 220.498816] hub 1-0:1.0: suspend port 1

[ 220.503399] usb usb1: set_port_feature port 1 feature 2

[ 220.508641] usb 1-1: usb_set_device_state new_state 8 ++

[ 220.513972] usb 1-1: usb_set_device_state --

[ 220.531763] usb 1-1: usb_suspend_device: status 0 --

[ 220.536824] usb 1-1: usb_suspend_both: status 0 --

[ 220.541702] usb 1-1: usb_suspend: --

[ 221.613605] usb usb1: usb_suspend: ++

[ 221.617321] usb usb1: choose_wakeup: msg.event 2 state 7 ++

[ 221.622966] usb usb1: choose_wakeup dev->power.can_wakeup 1 dev->power.should_wakeup 1 w 1

[ 221.631245] usb usb1: choose_wakeup: --

[ 221.635110] usb usb1: usb_suspend_both: state 7 ++

[ 221.639914] usb usb1: usb_suspend_interface: state 7 ++

[ 221.645262] hub 1-0:1.0: hub_suspend ++

[ 221.649122] hub 1-0:1.0: hub_suspend --

[ 221.652986] usb usb1: usb_suspend_interface: status 0 --

[ 221.658399] usb usb1: usb_suspend_device: do_remote_wakeup 1 state 7 ++

[ 221.665268] usb usb1: usb_set_device_state new_state 8 ++

[ 221.670681] usb usb1: usb_set_device_state --

[ 221.675065] usb usb1: usb_suspend_device: status 0 --

[ 221.680217] usb usb1: usb_suspend_both: status 0 --

[ 221.685375] usb usb1: usb_suspend: --

[ 221.691858] TZIC wake enabled=1 irq=24

[ 221.695672] PM: suspend of devices complete after 1380.215 msecs

[ 221.701683] suspend wp cpu=400000000

[ 221.708158] PM: late suspend of devices complete after 0.816 msecs

and here is of resume

[ 407.893079] PM: early resume of devices complete after 0.413 msecs

[ 407.899295] usb wakeup is here

[ 407.905077] TZIC wake enabled=0 irq=24

[ 407.908848] IPU DMFC NORMAL mode: 1(0~1), 5B(4,5), 5F(6,7)

[ 407.914663] wakeup wake lock: mmc_delayed_work

[ 407.922519] usb usb1: usb_resume: ++

[ 407.926097] usb usb1: usb_resume_both: state 8 ++

[ 407.930803] usb usb1: usb_resume_device: state 8 ++

[ 407.971845] usb usb1: usb_set_device_state new_state 7 ++

[ 407.977251] usb usb1: usb_set_device_state --

[ 407.981610] usb usb1: usb_resume_device: status 0 --

[ 407.996765] usb usb1: usb_resume_interface: state 7 ++

[ 408.013965] hub 1-0:1.0: hub_resume ++

[ 408.017739] hub_port_status change 0 status 507

[ 408.023435] hub 1-0:1.0: hub_resume --

[ 408.027189] usb usb1: usb_resume_interface: status 0 --

[ 408.032520] usb usb1: usb_resume_both: status 0 --

[ 408.037404] usb usb1: usb_resume: status 0 --

[ 408.041791] usb 1-1: usb_resume: ++

[ 408.045529] usb 1-1: usb_resume_both: state 8 ++

[ 408.050170] usb 1-1: usb_resume_device: state 8 ++

[ 408.054993] usb 1-1: usb_port_resume

[ 408.058593] hub_port_status change 0 status 507

[ 408.063156] usb usb1: clear_port_feature port 1 feature 2

[ 408.101840] hub_port_status change 3 status 101

[ 408.121835] usb 1-1: check_port_resume_type status 0 portchange 3 portstatus 257 reset_resume 0 persist_enabled 1

[ 408.132116] usb usb1: clear_port_feature port 1 feature 16

[ 408.137611] usb usb1: clear_port_feature port 1 feature 17

[ 408.143118] usb 1-1: finish reset-resume

[ 408.147044] usb 1-1: usb_set_device_state new_state 7 ++

[ 408.152372] usb 1-1: usb_set_device_state --

[ 408.156643] usb_reset_and_verify_device

[ 408.160492] usb 1-1: hub_port_init ++

[ 408.164170] hub 1-0:1.0: hub_port_reset

[ 408.168009] usb usb1: set_port_feature port 1 feature 4

[ 408.173254] hub 1-0:1.0: hub_port_wait_reset

[ 408.231837] hub_port_status change 0 status 503

[ 408.291910] usb usb1: clear_port_feature port 1 feature 20

[ 408.297419] usb 1-1: usb_set_device_state new_state 5 ++

[ 408.302759] usb 1-1: usb_set_device_state device_set_wakeup_capable 0

[ 408.309214] usb 1-1: usb_set_device_state --

[ 408.313596] usb 1-1: reset high speed USB device using fsl-ehci and address 3

[ 408.321652] hub 1-0:1.0: hub_port_reset

[ 408.325520] usb usb1: set_port_feature port 1 feature 4

[ 408.330763] hub 1-0:1.0: hub_port_wait_reset

[ 408.391831] hub_port_status change 0 status 503

[ 408.451833] usb usb1: clear_port_feature port 1 feature 20

[ 408.457327] usb 1-1: usb_set_device_state new_state 5 ++

[ 408.462655] usb 1-1: usb_set_device_state device_set_wakeup_capable 0

[ 408.469099] usb 1-1: usb_set_device_state --

[ 408.474031] usb 1-1: usb_set_device_state new_state 6 ++

[ 408.479345] usb 1-1: usb_set_device_state device_set_wakeup_capable 0

[ 408.485801] usb 1-1: usb_set_device_state --

[ 408.512407] usb 1-1: hub_port_init --

[ 408.537152] usb 1-1: usb_set_device_state new_state 7 ++

[ 408.542485] usb 1-1: usb_set_device_state device_set_wakeup_capable 32

[ 408.549014] usb 1-1: usb_set_device_state --

[ 408.555403] usb 1-1: usb_resume_device: status 0 --

[ 408.560372] usb 1-1: usb_resume_interface: state 7 ++

[ 408.565528] usb 1-1: usb_resume_interface: status 0 --

[ 408.570796] usb 1-1: usb_resume_interface: state 7 ++

[ 408.575872] usb 1-1: usb_resume_interface: status 0 --

[ 408.581098] usb 1-1: usb_resume_interface: state 7 ++

[ 408.586173] usb 1-1: usb_resume_interface: status 0 --

[ 408.591400] usb 1-1: usb_resume_interface: state 7 ++

[ 408.596467] usb 1-1: usb_resume_interface: status 0 --

[ 408.601693] usb 1-1: usb_resume_interface: state 7 ++

[ 408.606760] usb 1-1: usb_resume_interface: status 0 --

[ 408.611999] usb 1-1: usb_resume_interface: state 7 ++

[ 408.617054] usb 1-1: usb_resume_interface: status 0 --

[ 408.622293] usb 1-1: usb_resume_interface: state 7 ++

[ 408.627347] usb 1-1: usb_resume_interface: status 0 --

[ 408.632588] usb 1-1: usb_resume_interface: state 7 ++

[ 408.637642] usb 1-1: usb_resume_interface: status 0 --

[ 408.642880] usb 1-1: usb_resume_interface: state 7 ++

[ 408.647934] usb 1-1: usb_resume_interface: status 0 --

[ 408.653173] usb 1-1: usb_resume_interface: state 7 ++

[ 408.658226] usb 1-1: usb_resume_interface: status 0 --

[ 408.663464] usb 1-1: usb_resume_interface: state 7 ++

[ 408.668518] usb 1-1: usb_resume_interface: status 0 --

[ 408.673757] usb 1-1: usb_resume_interface: state 7 ++

[ 408.678811] usb 1-1: usb_resume_interface: status 0 --

[ 408.684050] usb 1-1: usb_resume_interface: state 7 ++

[ 408.689103] usb 1-1: usb_resume_interface: status 0 --

[ 408.694342] usb 1-1: usb_resume_interface: state 7 ++

[ 408.699395] usb 1-1: usb_resume_interface: status 0 --

[ 408.704633] usb 1-1: usb_resume_both: status 0 --

[ 408.709428] usb 1-1: usb_resume: status 0 --

[ 408.713902] PM: resume of devices complete after 809.303 msecs

[ 408.719775] usb 1-1: usb_resume: ++

[ 408.723293] usb 1-1: usb_resume: status 0 --

[ 408.727635] usb usb1: usb_resume: ++

[ 408.731211] usb usb1: usb_resume: status 0 --

[ 408.736575] Restarting tasks ...

[ 408.739980] usb usb1: usb_remote_wakeup state 7

[ 408.744850] hub_port_status change 0 status 503

[ 408.766266] done.

[ 408.770369] dvfs: enable dvfs after resume

[ 408.793087] suspend: exit suspend, ret = 0 (1970-01-02 00:11:45.337744763 UTC)

[ 413.751951] mmc0: Starting deferred resume

[ 413.904547] mmc0: Deferred resume completed

  After usb hub had cleared the feature USB_PORT_FEAT_SUSPEND of its port, the bit USB_PORT_STAT_ENABLE of PortStatus of this port became cleared. And PortChange bits are USB_PORT_STAT_C_CONNECTION and USB_PORT_STAT_C_ENABLE. Apparently something goes wrong...

[jamesbone]

what version of PMIC has your i.MX53QSB?   Dialog or FSL?  we do not have implemented all the low power modes in Dialog power driver

[warl0rd]

I use the MCIMX53-START-R board (Quickstart_Ripley_B) with Freescale PMIC MC34708.

[qiang_li-mpu_se · Accepted solution]

It is a known issue for iMX USB module, but the workaround can only work on iMX6. No workaround for iMX53 due to the USB PHY is different. For iMX53, we suggest the modem to use GPIO pin to wake up the CPU.

Description:

When the IC works as a USB host and one High Speed device is connected, software can put it into

Suspend mode and it can wake up by a Host Resume or a remote wakeup.

The UTM block drives FS-K during resume and drives SE0 as the end of the resume. Meanwhile

UTM bypasses the DP/DN lines to USB controller. Once the controller detects the SE0, it will

switches to High Speed. Once UTM detects it switches to High Speed, it will stop driving SE0.

After that, the controller starts to send SOF through UTM.

If the controller sends the SOF too fast, while the external device may still be in Full Speed mode,

the SOF signal level will be 800mV which will be recognized as a High Speed disconnection.

The USB controller may send the SOF packet during that period, but according to USB2.0 spec,

DP/DN should keep in IDLE (SE0 state) for 1.333 μs after resume to avoid this issue (the device

must switch to High Speed in 1.333 μs).

Projected Impact:

HS disconnection after resume with some devices.

Workarounds:

The UTM block has a configurable bit (HW_USBPHY_CTRL.ENHOSTDISCONDETECT) to

enable/disable the High Speed disconnection detection circuit. This bit should be used to disable

this in Suspend, and enable after resume.