Hi,
I had posted this mail to linux-pm a few days back. Was not able to
resolve this issue
I thought this is the right list to post to.
1) I have a USB - GSM device which is connected to a transreciver.
2) The transreciver is connected to the host controller and the only
control i got over it is to reset it
or bring it out of reset using a gpio.
3) The USB GSM device is self powered and does not need current from
the USB Bus.
4) When the usb device is idle - When i do suspend the system "echo
mem > /sys/power/state".
every thing works fine
5) When the usb device is busy (Say somebody is calling the phone
when i am in suspend)
I get -19 as the error code.
6) What is being done in the suspend code is - turn off clocks and
bring transreciver in reset.
7) In resume function - We turn on all the clocks and bring the
transreciver out of reset.
8) The usb device is functional all through out since it is self
powered, However it is disconnected from the host.
All i understood was - The host is not able to communicate with the
device when the resume fails or the device
has not replied back properly.
USB a host initiated protocol In that case the GSM device cannot send
anything on the bus. isnt it?
So in this case the only problem i think could be the transreciever
has not got reset properly or within time.
I am not really sure though.
I am not sure if this is a device issue?
Please advice.
Regards,
Sriram
Successful resume:
-----------------------------
PM: Syncing filesystems ... done.
PM: Preparing system for mem sleep
Freezing user space processes ... (elapsed 0.00 seconds) done.
Freezing remaining freezable tasks ... (elapsed 0.00 seconds) done.
PM: Entering mem sleep
Suspending console(s) (use no_console_suspend to debug)
hub 1-0:1.0: hub_suspend
usb usb1: bus suspend
ehci-omap ehci-omap.0: suspend root hub
ehci-omap ehci-omap.0: port 3, 00001000 -> 00701000
ehci-omap ehci-omap.0: port 2, 00001005 -> 00701085
ehci-omap ehci-omap.0: port 1, 00001000 -> 00701000
usb usb1: usb resume
USB resume
ehci-omap ehci-omap.0: resume root hub
ehci-omap ehci-omap.0: resumed port 2
hub 1-0:1.0: hub_resume
ehci-omap ehci-omap.0: GetStatus port 1 status 001000 POWER sig=se0
ehci-omap ehci-omap.0: GetStatus port 2 status 001005 POWER sig=se0 PE CONNECT
hub 1-0:1.0: port 2: status 0503 change 0000
ehci-omap ehci-omap.0: GetStatus port 3 status 001000 POWER sig=se0
PM: Finishing wakeup.
Restarting tasks ... <7>hub 1-0:1.0: state 7 ports 3 chg 0000 evt 0000
done.
Unsuccessful Resume:
----------------------------------
PM: Syncing filesystems ... done.
PM: Preparing system for mem sleep
Freezing user space processes ... (elapsed 0.00 seconds) done.
Freezing remaining freezable tasks ... (elapsed 0.00 seconds) done.
PM: Entering mem sleep
Suspending console(s) (use no_console_suspend to debug)
hub 1-0:1.0: hub_suspend
usb usb1: bus suspend
ehci-omap ehci-omap.0: suspend root hub
ehci-omap ehci-omap.0: port 3, 00001000 -> 00701000
ehci-omap ehci-omap.0: port 2, 00001005 -> 00701085
ehci-omap ehci-omap.0: port 1, 00001000 -> 00701000
usb usb1: usb resume
USB resume
ehci-omap ehci-omap.0: resume root hub
ehci-omap ehci-omap.0: irq status 000c FLR PCD
hub 1-0:1.0: hub_resume
ehci-omap ehci-omap.0: GetStatus port 1 status 001000 POWER sig=se0
ehci-omap ehci-omap.0: GetStatus port 2 status 001002 POWER sig=se0 CSC
hub 1-0:1.0: port 2: status 0100 change 0001
ehci-omap ehci-omap.0: GetStatus port 3 status 001000 POWER sig=se0
ehci-omap ehci-omap.0: GetStatus port 2 status 001000 POWER sig=se0
hub 1-0:1.0: port 2 status 0000.0100 after resume, -19
usb 1-2: can't resume, status -19
hub 1-0:1.0: logical disconnect on port 2
pm_op(): usb_dev_resume+0x0/0x18 returns -19
PM: Device 1-2 failed to resume: error -19
PM: Finishing wakeup.
Restarting tasks ... <7>hub 1-0:1.0: state 7 ports 3 chg 0004 evt 0000
ehci-omap ehci-omap.0: GetStatus port 2 status 001000 POWER sig=se0
hub 1-0:1.0: port 2, status 0100, change 0000, 12 Mb/s
usb 1-2: USB disconnect, address 2
usb 1-2: unregistering device
usb 1-2: usb_disable_device nuking all URBs
usb 1-2: unregistering interface 1-2:1.0
usb 1-2:1.0: uevent
usb 1-2: unregistering interface 1-2:1.1
usb 1-2:1.1: uevent
usb 1-2: unregistering interface 1-2:1.2
usb 1-2:1.2: uevent
usb 1-2: unregistering interface 1-2:1.3
done.
usb 1-2:1.3: uevent
usb 1-2: unregistering interface 1-2:1.4
usb 1-2:1.4: uevent
usb 1-2: uevent
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