Message-Id: <200901192333.40757.arvidjaar@mail.ru>
Date:	Mon, 19 Jan 2009 23:33:37 +0300
From:	Andrey Borzenkov <arvidjaar@...l.ru>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	linux-usb@...r.kernel.org, linux-acpi@...r.kernel.org,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [2.6.29-rc2] ALi USB OHCI enables interrupts during power down in suspend.

On 19 января 2009 22:13:46 Rafael J. Wysocki wrote:
> On Monday 19 January 2009, Andrey Borzenkov wrote:
> > On 19 января 2009 12:51:12 Rafael J. Wysocki wrote:
> > > On Monday 19 January 2009, Andrey Borzenkov wrote:
> > > > On 19 января 2009 03:17:49 Rafael J. Wysocki wrote:
> > > > > On Sunday 18 January 2009, Andrey Borzenkov wrote:
> > > > > > On 18 января 2009 23:21:24 Rafael J. Wysocki wrote:
> > > > > > > > > As far as I can tell, timekeeping_resume is called
> > > > > > > > > via class ->resume method; and according to comments
> > > > > > > > > in sysdev_resume() and device_power_up(), they are
> > > > > > > > > called with interrupts disabled.
> > > > > > > > >
> > > > > > > > > Looking at suspend_enter, irqs *are* disabled at this
> > > > > > > > > point.
> > > > > > > > >
> > > > > > > > > So it actually looks like something (may be some
> > > > > > > > > driver) unconditionally enabled irqs in resume path.
> > > > > > > > >
> > > > > > > > > I believe the patch should be hold back until this is
> > > > > > > > > clarified.
> > > > > > > >
> > > > > > > > That's a nice theory!
> > > > > > >
> > > > > > > That would be a bad bug.
> >
> > [...]
> >
> > > However, I suspect the problem is somewhere else.
> >
> > Right.
> >
> > > Can you apply the patch I sent earlier in this thread
> > > (http://lkml.org/lkml/2009/1/18/183) and retest?
> >
> > I did and it was silent. But with patch below I get:
> >
> > [  152.526550] Freezing user space processes ... (elapsed 0.01
> > seconds) done.
> > [  152.544162] Freezing remaining freezable tasks ... (elapsed 0.00
> > seconds) done.
> > [  152.544854] Suspending console(s) (use no_console_suspend to
> > debug) [  152.556234] sd 0:0:0:0: [sda] Synchronizing SCSI cache
> > [  152.907091] sd 0:0:0:0: [sda] Stopping disk
> > [  153.579824] pci 0000:01:00.0: power state changed by ACPI to D3
> > [  153.594449] e100 0000:00:0a.0: PME# enabled
> > [  153.594688] e100 0000:00:0a.0: wake-up capability enabled by
> > ACPI [  153.594855] e100 0000:00:0a.0: PCI INT A disabled
> > [  153.650834] ALI 5451 0000:00:06.0: PCI INT A disabled
> > [  153.663826] ALI 5451 0000:00:06.0: power state changed by ACPI
> > to D3 [  154.417072] pata_ali 0000:00:04.0: can't derive routing
> > for PCI INT A [  154.430275] ohci_hcd 0000:00:02.0: PME# enabled
> > [  154.430490] ohci_hcd 0000:00:02.0: wake-up capability enabled by
> > ACPI [  154.430520] ohci_hcd 0000:00:02.0: PCI INT A disabled
> > [  154.446867] ACPI: Preparing to enter system sleep state S3
> > [  154.460237] ------------[ cut here ]------------
> > [  154.460250] WARNING: at /home/bor/src/linux-
> > git/drivers/base/power/main.c:579 device_power_down+0x18f/0x1e0()
> > [  154.460259] Hardware name: PORTEGE 4000
> > [  154.460265] Interrupts enabled after 0000:00:02.0!
> >
> > The device is
> >
> > {pts/2}% lspci -nnv -s 00:02.0
> > 00:02.0 USB Controller [0c03]: ALi Corporation USB 1.1 Controller
> > [10b9:5237] (rev 03) (prog-if 10 [OHCI])
> >         Subsystem: Toshiba America Info Systems Device [1179:0004]
> >         Flags: bus master, medium devsel, latency 64, IRQ 11
> >         Memory at f7eff000 (32-bit, non-prefetchable) [size=4K]
> >         Capabilities: <access denied>
> >         Kernel driver in use: ohci_hcd
> >         Kernel modules: ohci-hcd
> >
> > and this does not surprise me at all given all the problems I had
> > with this USB controller.
> >
> > Suspicious is
> >
> > ohci_hcd 0000:00:02.0: wake-up capability enabled by ACPI
> >
> > this controller has history of broken wake up functionality.
>
> Ah.
>
> Can you please check if the appended patch fixes the issue for you?
>
> Rafael
>

Yes.

Tested-by: Andrey Borzenkov <arvidjaar@...l.ru>

>
> ---
>  drivers/usb/core/hcd-pci.c  |  116
> ++++++++++---------------------------------- drivers/usb/core/hcd.h  
>    |    1
>  drivers/usb/host/ehci-pci.c |    1
>  drivers/usb/host/ohci-pci.c |    1
>  drivers/usb/host/uhci-hcd.c |    1
>  5 files changed, 27 insertions(+), 93 deletions(-)
>
> Index: linux-2.6/drivers/usb/core/hcd-pci.c
> ===================================================================
> --- linux-2.6.orig/drivers/usb/core/hcd-pci.c
> +++ linux-2.6/drivers/usb/core/hcd-pci.c
> @@ -200,6 +200,7 @@ int usb_hcd_pci_suspend(struct pci_dev *
>  	struct usb_hcd		*hcd = pci_get_drvdata(dev);
>  	int			retval = 0;
>  	int			wake, w;
> +	int			has_pci_pm;
>
>  	/* Root hub suspend should have stopped all downstream traffic,
>  	 * and all bus master traffic.  And done so for both the interface
> @@ -229,6 +230,15 @@ int usb_hcd_pci_suspend(struct pci_dev *
>
>  	synchronize_irq(dev->irq);
>
> +	/* Downstream ports from this root hub should already be quiesced,
> so +	 * there will be no DMA activity.  Now we can shut down the
> upstream +	 * link (except maybe for PME# resume signaling) and enter
> some PCI +	 * low power state, if the hardware allows.
> +	 */
> +	pci_disable_device(dev);
> +
> +	pci_save_state(dev);
> +
>  	/* Don't fail on error to enable wakeup.  We rely on pci code
>  	 * to reject requests the hardware can't implement, rather
>  	 * than coding the same thing.
> @@ -240,35 +250,6 @@ int usb_hcd_pci_suspend(struct pci_dev *
>  		wake = w;
>  	dev_dbg(&dev->dev, "wakeup: %d\n", wake);
>
> -	/* Downstream ports from this root hub should already be quiesced,
> so -	 * there will be no DMA activity.  Now we can shut down the
> upstream -	 * link (except maybe for PME# resume signaling) and enter
> some PCI -	 * low power state, if the hardware allows.
> -	 */
> -	pci_disable_device(dev);
> - done:
> -	return retval;
> -}
> -EXPORT_SYMBOL_GPL(usb_hcd_pci_suspend);
> -
> -/**
> - * usb_hcd_pci_suspend_late - suspend a PCI-based HCD after IRQs are
> disabled - * @dev: USB Host Controller being suspended
> - * @message: Power Management message describing this state
> transition - *
> - * Store this function in the HCD's struct pci_driver as
> .suspend_late. - */
> -int usb_hcd_pci_suspend_late(struct pci_dev *dev, pm_message_t
> message) -{
> -	int			retval = 0;
> -	int			has_pci_pm;
> -
> -	/* We might already be suspended (runtime PM -- not yet written) */
> -	if (dev->current_state != PCI_D0)
> -		goto done;
> -
> -	pci_save_state(dev);
> -
>  	/* Don't change state if we don't need to */
>  	if (message.event == PM_EVENT_FREEZE ||
>  			message.event == PM_EVENT_PRETHAW) {
> @@ -314,7 +295,7 @@ int usb_hcd_pci_suspend_late(struct pci_
>   done:
>  	return retval;
>  }
> -EXPORT_SYMBOL_GPL(usb_hcd_pci_suspend_late);
> +EXPORT_SYMBOL_GPL(usb_hcd_pci_suspend);
>
>  /**
>   * usb_hcd_pci_resume_early - resume a PCI-based HCD before IRQs are
> enabled @@ -324,65 +305,8 @@ EXPORT_SYMBOL_GPL(usb_hcd_pci_suspend_la
> */
>  int usb_hcd_pci_resume_early(struct pci_dev *dev)
>  {
> -	int		retval = 0;
> -	pci_power_t	state = dev->current_state;
> -
> -#ifdef CONFIG_PPC_PMAC
> -	/* Reenable ASIC clocks for USB */
> -	if (machine_is(powermac)) {
> -		struct device_node *of_node;
> -
> -		of_node = pci_device_to_OF_node(dev);
> -		if (of_node)
> -			pmac_call_feature(PMAC_FTR_USB_ENABLE,
> -						of_node, 0, 1);
> -	}
> -#endif
> -
> -	/* NOTE:  chip docs cover clean "real suspend" cases (what Linux
> -	 * calls "standby", "suspend to RAM", and so on).  There are also
> -	 * dirty cases when swsusp fakes a suspend in "shutdown" mode.
> -	 */
> -	if (state != PCI_D0) {
> -#ifdef	DEBUG
> -		int	pci_pm;
> -		u16	pmcr;
> -
> -		pci_pm = pci_find_capability(dev, PCI_CAP_ID_PM);
> -		pci_read_config_word(dev, pci_pm + PCI_PM_CTRL, &pmcr);
> -		pmcr &= PCI_PM_CTRL_STATE_MASK;
> -		if (pmcr) {
> -			/* Clean case:  power to USB and to HC registers was
> -			 * maintained; remote wakeup is easy.
> -			 */
> -			dev_dbg(&dev->dev, "resume from PCI D%d\n", pmcr);
> -		} else {
> -			/* Clean:  HC lost Vcc power, D0 uninitialized
> -			 *   + Vaux may have preserved port and transceiver
> -			 *     state ... for remote wakeup from D3cold
> -			 *   + or not; HCD must reinit + re-enumerate
> -			 *
> -			 * Dirty: D0 semi-initialized cases with swsusp
> -			 *   + after BIOS init
> -			 *   + after Linux init (HCD statically linked)
> -			 */
> -			dev_dbg(&dev->dev, "resume from previous PCI D%d\n",
> -					state);
> -		}
> -#endif
> -
> -		retval = pci_set_power_state(dev, PCI_D0);
> -	} else {
> -		/* Same basic cases: clean (powered/not), dirty */
> -		dev_dbg(&dev->dev, "PCI legacy resume\n");
> -	}
> -
> -	if (retval < 0)
> -		dev_err(&dev->dev, "can't resume: %d\n", retval);
> -	else
> -		pci_restore_state(dev);
> -
> -	return retval;
> +	pci_restore_state(dev);
> +	return 0;
>  }
>  EXPORT_SYMBOL_GPL(usb_hcd_pci_resume_early);
>
> @@ -397,6 +321,18 @@ int usb_hcd_pci_resume(struct pci_dev *d
>  	struct usb_hcd		*hcd;
>  	int			retval;
>
> +#ifdef CONFIG_PPC_PMAC
> +	/* Reenable ASIC clocks for USB */
> +	if (machine_is(powermac)) {
> +		struct device_node *of_node;
> +
> +		of_node = pci_device_to_OF_node(dev);
> +		if (of_node)
> +			pmac_call_feature(PMAC_FTR_USB_ENABLE,
> +						of_node, 0, 1);
> +	}
> +#endif
> +
>  	hcd = pci_get_drvdata(dev);
>  	if (hcd->state != HC_STATE_SUSPENDED) {
>  		dev_dbg(hcd->self.controller,
> @@ -404,6 +340,8 @@ int usb_hcd_pci_resume(struct pci_dev *d
>  		return 0;
>  	}
>
> +	pci_enable_wake(dev, PCI_D0, false);
> +
>  	retval = pci_enable_device(dev);
>  	if (retval < 0) {
>  		dev_err(&dev->dev, "can't re-enable after resume, %d!\n",
> Index: linux-2.6/drivers/usb/core/hcd.h
> ===================================================================
> --- linux-2.6.orig/drivers/usb/core/hcd.h
> +++ linux-2.6/drivers/usb/core/hcd.h
> @@ -257,7 +257,6 @@ extern void usb_hcd_pci_remove(struct pc
>
>  #ifdef CONFIG_PM
>  extern int usb_hcd_pci_suspend(struct pci_dev *dev, pm_message_t
> msg); -extern int usb_hcd_pci_suspend_late(struct pci_dev *dev,
> pm_message_t msg); extern int usb_hcd_pci_resume_early(struct pci_dev
> *dev);
>  extern int usb_hcd_pci_resume(struct pci_dev *dev);
>  #endif /* CONFIG_PM */
> Index: linux-2.6/drivers/usb/host/ehci-pci.c
> ===================================================================
> --- linux-2.6.orig/drivers/usb/host/ehci-pci.c
> +++ linux-2.6/drivers/usb/host/ehci-pci.c
> @@ -432,7 +432,6 @@ static struct pci_driver ehci_pci_driver
>
>  #ifdef	CONFIG_PM
>  	.suspend =	usb_hcd_pci_suspend,
> -	.suspend_late =	usb_hcd_pci_suspend_late,
>  	.resume_early =	usb_hcd_pci_resume_early,
>  	.resume =	usb_hcd_pci_resume,
>  #endif
> Index: linux-2.6/drivers/usb/host/ohci-pci.c
> ===================================================================
> --- linux-2.6.orig/drivers/usb/host/ohci-pci.c
> +++ linux-2.6/drivers/usb/host/ohci-pci.c
> @@ -487,7 +487,6 @@ static struct pci_driver ohci_pci_driver
>
>  #ifdef	CONFIG_PM
>  	.suspend =	usb_hcd_pci_suspend,
> -	.suspend_late =	usb_hcd_pci_suspend_late,
>  	.resume_early =	usb_hcd_pci_resume_early,
>  	.resume =	usb_hcd_pci_resume,
>  #endif
> Index: linux-2.6/drivers/usb/host/uhci-hcd.c
> ===================================================================
> --- linux-2.6.orig/drivers/usb/host/uhci-hcd.c
> +++ linux-2.6/drivers/usb/host/uhci-hcd.c
> @@ -942,7 +942,6 @@ static struct pci_driver uhci_pci_driver
>
>  #ifdef	CONFIG_PM
>  	.suspend =	usb_hcd_pci_suspend,
> -	.suspend_late =	usb_hcd_pci_suspend_late,
>  	.resume_early =	usb_hcd_pci_resume_early,
>  	.resume =	usb_hcd_pci_resume,
>  #endif	/* PM */


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