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Date: Mon, 19 Jan 2009 21:48:01 +0100
From: "Rafael J. Wysocki" <rjw@...k.pl>
To: Andrey Borzenkov <arvidjaar@...l.ru>
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 Monday 19 January 2009, Andrey Borzenkov wrote:
> 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>
OK, thanks for the confirmation.
Time to write a changelog ...
> > ---
> > 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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