2010-07-29 20:50:14 BF524/6 hibernate wake from USB

Michael Dean (UNITED STATES)

Message: 91893

Hi all - I have another hibernate question.

We are on the latest trunk updated 7/29 - Linux version 2.6.34.1-ADI-2010R1-pre-svn9020 (gcc version 4.3.5 (ADI-trunk/svn-1643) ) #157 Thu Jul 29 18:10:57 EDT 201

We are trying to get hibernate wake from USB working. Do you know if this has been tried/should work? I can see the kernel used to have kconfig stuff for wake from USB/CAN, but it seems to be gone now. The processor spec says it should work and the dpmc.h has USBWE defined. We have tried the following in pm.c:

We are entering hibernate using "echo mem > /sys/power/state"

[ 119.680000] PM: Syncing filesystems ... done.

[ 119.710000] Freezing user space processes ... (elapsed 0.02 seconds) done.

[ 119.740000] Freezing remaining freezable tasks ... (elapsed 0.02 seconds) done.

[ 119.760000] Suspending console(s) (use no_console_suspend to debug)

at this point we can see all usb activity on d-/+ stop and the lines go low. Our external event causes the USB lines to toggle high but the processor does not exit hibernate. Does do_hibernate support USBWE?

Thanks,

Michael

...

wakeup |= SCKELOW;

wakeup |= USBWE;

...

do_hibernate(wakeup | vr_wakeup);

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2010-07-29 21:53:15 BF524/6 hibernate wake from USB

Bob Liu (CHINA)

Message: 91895

Hi, Michael

At this point, we still not support USBWE hibernate!

Thanks.

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2010-07-30 06:40:41 Re: BF524/6 hibernate wake from USB

Bob Liu (CHINA)

Message: 91917

Hi,Michael

In my test do_hibernate support USBWE only when plug in a B device.

But our current svn code doesn't support it, you can temporary test it by adding wakeup |= USBWE to function

bfin_pm_suspend_mem_enter() in file arch/blackfin/mach-common/pm.c.

Regards,

-Bob

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2010-07-30 07:21:46 Re: BF524/6 hibernate wake from USB

Michael Hennerich (GERMANY)

Message: 91918 There is some code in musb_core.c:

/* FIXME this handles wakeup irqs wrong */

if (enable_irq_wake(nIrq) == 0) {

musb->irq_wake = 1;

device_init_wakeup(dev, 1);

} else {

musb->irq_wake = 0;

}

Not sure if this code really works based on the comment above...

But in case the common code calls enable_irq_wake() then Blackfin ARCH code will take care of it:

Take a look at arch/Blackfin/mach-common/ints-priority.c:

int bfin_internal_set_wake(unsigned int irq, unsigned int state)

{

[--snip--]

#ifdef IRQ_USB_INT0

case IRQ_USB_INT0:

wakeup |= USBWE;

break;

#endif

[--snip--]

}

-Michael

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2010-07-30 13:25:04 Re: BF524/6 hibernate wake from USB

Michael Dean (UNITED STATES)

Message: 91928

Bob/Michael,

Could you explain your statement from above? Are you saying that you have woken up from hibernate by the insertion of a B device? I have tried the exact change you suggested and it does not wake when the USB data lines go high.

We are running usb in host mode and have an internal USB cell module connected to the BF524. We want to wake up the blackfin from hibernate when we have incoming data. Basically WOL but over usb. We can hibernate the system using the rtcwake and when it wakes up everything is good to go. It seems like just need to get out of hibernate from the USB activity source. I am not close to understanding all this code so we are just trying to understand what should work, what has never been tried, and possibly how difficult this will be to get working.

Thanks,

Michael

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2010-08-02 00:07:04 Re: BF524/6 hibernate wake from USB

Bob Liu (CHINA)

Message: 91996

Bob/Michael,

> I have updated the kernel support. And in my test on BF548-0.2, it works ok whether plug in a USB device or plug to a PC host as a device. The processor can be waked up. Would you try it again and serval times?

>I think it can be wakeup. As the spec said if USB_DP,USB_DM or USB_VBUS edge detected,the wakeup signal can generated, you can try it.

---

Thanks,

Bob

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2010-08-02 02:53:12 Re: BF524/6 hibernate wake from USB

Bob Liu (CHINA)

Message: 92001

Please ignore my last message, I made a mistake. Sorry.

In my opinion, currently we can wakeup from hibernate by plug in a USB device or plug to a PC host as a device.

But have no way to wakeup when data come in.

---

Thanks

Bob

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2010-08-02 12:21:51 Re: BF524/6 hibernate wake from USB

Michael Dean (UNITED STATES)

Message: 92055

Hi Bob,

Do you know if the wakeup from usb DATA lines is a hardware limitation, or software?

Thanks,

Michael

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2010-08-02 13:26:44 Re: BF524/6 hibernate wake from USB

Christopher Harrsen (UNITED STATES)

Message: 92060

Hi Michael,

Wake from hibernate is supported in hardware. Please see below from the HRM.

Powering Down the Core (Hibernate State)

The internal supply regulator for the processor can be shut off by writing

b#00

to the FREQ bits of the VR_CTL register. This disables both CCLK and

SCLK

0 V, eliminating any leakage currents from the processor. The internal

supply regulator can be woken up by several user-selectable events, all of

which are controlled in the

. Furthermore, it sets the internal power supply voltage (VDDINT) toVR_CTL register:

• RTC event or assertion of the

(

enabled.

• External GP event, or Ethernet PHY event. Set the PHY wakeup

enable (

RESET pin. Set the wakeup-enableWAKE) control bit. This bit must be set if no other wakeups arePHYWE) control bit to enable wakeup upon assertion of the

PHY_INT/PG15

interrupt is needed, set this bit to enable a general-purpose external

event via the

pin by an external PHY device. If no external PHYPG15 pin.

• Activity between the pins

enable (

bus activity on the

• Pin

is an output pin which is a logical OR of the above wakeup sources,

except Hardware Reset. This pin follows the wakeup signal of the

various wakeup sources.

USBDP and USBDM. Set the USB wakeupUSBWE) control bit to enable wakeup upon detection of USBUSBDP/USBDM pins.EXT_WAKE is provided to indicate the occurrence of wakeup. It

Chris

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2010-08-02 14:23:18 Re: BF524/6 hibernate wake from USB

Robin Getz (UNITED STATES)

Message: 92062

Chris:

the way word is "upon detection" not "upon activity" - they are not the same.

Can you confirm that it is activity?

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2010-08-02 21:49:15 Re: BF524/6 hibernate wake from USB

Bob Liu (CHINA)

Message: 92075

> Do you know if the wakeup from usb DATA lines is a hardware limitation, or software?

I think it's the software limitation, as the spec said edge detected on USBUSBDP/USBDM will also generate wakup event.

By the way, are you using the musb in host mode ?

In host mode I can hibernate the system, but I always got the connect interrupt which wakeup the system

immediately.

I can test data wakeup only after fix this problem.

-Bob

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2010-08-04 07:07:34 Re: BF524/6 hibernate wake from USB

Bob Liu (CHINA)

Message: 92152

Hi, Michael

I can hibernate the system in host mode correctly now.

But it can't be waked up by plug in a device, because the VBUS is off during hibernate state.

And now I have no way to test the data wakeup as i can't find a device which can provide data without VBUS.

What's your method?

Thanks

-Bob

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2010-08-06 14:21:51 Re: BF524/6 hibernate wake from USB

Michael Dean (UNITED STATES)

Message: 92227

Bob,

We have this working now. The key was setting up the usb controller control 2 register

test = bfin_read_USB_APHY_CNTRL2();

test |= 0x0001;

bfin_write_USB_APHY_CNTRL2(test);

Getting data to be sent to the device to wake it up it a bit of a trick. We have a solution that allows us to test this.

Thanks for your help.

Michael

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2010-08-06 22:14:59 Re: BF524/6 hibernate wake from USB

Bob Liu (CHINA)

Message: 92232

Great !

By the way, have you set kernel config CONFIG_USB_SUSPEND ?

Will you get a connect interrupt which wakeup the system immediately ( Because the VBUS change )?

And after resume is there any connection interrupt ?

Sorry for so many question, but I think my result is very different from your.

Maybe the lastest kernel I updated will have problem.

Thanks a lot.

-Bob

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2010-07-29 20:50:14 BF524/6 hibernate wake from USB