2.6.14 USB vs. sleep issues
Benjamin Herrenschmidt
benh at kernel.crashing.org
Sun Nov 6 09:17:20 EST 2005
On Sat, 2005-11-05 at 22:58 +0100, Bin Zhang wrote:
> On 11/3/05, Benjamin Herrenschmidt <benh at kernel.crashing.org> wrote:
> > For those who experience crashes on sleep and/or wakeup (typically due
> > to USB) with 2.6.14, I made a test patch that might help. Please let me
> > know if it makes things more reliable.
> >
> I've tried your patch with usb wifi dlink dwl-g122 (my eth1). It works.
> There are some differences in /var/log/syslog :
I have another patch tho:
Index: linux-2.6.14-benh/drivers/usb/core/hcd-pci.c
===================================================================
--- linux-2.6.14-benh.orig/drivers/usb/core/hcd-pci.c 2005-10-31 10:54:44.000000000 +1100
+++ linux-2.6.14-benh/drivers/usb/core/hcd-pci.c 2005-11-05 11:58:55.000000000 +1100
@@ -32,6 +32,13 @@
#include <linux/usb.h>
#include "hcd.h"
+#ifdef CONFIG_PPC_PMAC
+#include <asm/machdep.h>
+#include <asm/pmac_feature.h>
+#include <asm/pci-bridge.h>
+#include <asm/prom.h>
+#endif
+
/* PCI-based HCs are common, but plenty of non-PCI HCs are used too */
@@ -278,6 +285,18 @@
break;
}
+#ifdef CONFIG_PPC_PMAC
+ if (retval == 0 && _machine == _MACH_Pmac) {
+ struct device_node *of_node;
+
+ /* Disable USB PAD & cell clock */
+ of_node = pci_device_to_OF_node (to_pci_dev(hcd->self.
+ controller));
+ if (of_node)
+ pmac_call_feature(PMAC_FTR_USB_ENABLE, of_node, 0, 0);
+ }
+#endif /* CONFIG_PPC_PMAC */
+
/* update power_state **ONLY** to make sysfs happier */
if (retval == 0)
dev->dev.power.power_state = message;
@@ -303,6 +322,18 @@
return 0;
}
+#ifdef CONFIG_PPC_PMAC
+ if (_machine == _MACH_Pmac) {
+ struct device_node *of_node;
+
+ /* Re-enable USB PAD & cell clock */
+ of_node = pci_device_to_OF_node (to_pci_dev(hcd->self.
+ controller));
+ if (of_node)
+ pmac_call_feature(PMAC_FTR_USB_ENABLE, of_node, 0, 1);
+ }
+#endif /* CONFIG_PPC_PMAC */
+
/* 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.
@@ -381,7 +412,6 @@
usb_hc_died (hcd);
}
- retval = pci_enable_device(dev);
return retval;
}
EXPORT_SYMBOL (usb_hcd_pci_resume);
Index: linux-2.6.14-benh/drivers/usb/host/ehci-hcd.c
===================================================================
--- linux-2.6.14-benh.orig/drivers/usb/host/ehci-hcd.c 2005-10-31 10:54:44.000000000 +1100
+++ linux-2.6.14-benh/drivers/usb/host/ehci-hcd.c 2005-11-06 08:26:42.000000000 +1100
@@ -750,6 +750,15 @@
if (time_before (jiffies, ehci->next_statechange))
msleep (100);
+ /* Disable emission of interrupts during suspend */
+ writel(0, &ehci->regs->intr_enable);
+ mb();
+ clear_bit(HC_FLAG_IRQ_ON, &hcd->bitflags);
+ synchronize_irq(dev->irq);
+
+ /* Tell root hub not to bother trying to resume */
+ set_bit(HC_FLAG_SUSPEND_RH, &hcd->bitflags);
+
#ifdef CONFIG_USB_SUSPEND
(void) usb_suspend_device (hcd->self.root_hub, message);
#else
@@ -776,6 +785,9 @@
if (time_before (jiffies, ehci->next_statechange))
msleep (100);
+ clear_bit(HC_FLAG_SUSPEND_RH, &hcd->bitflags);
+ set_bit(HC_FLAG_IRQ_ON, &hcd->bitflags);
+
/* If any port is suspended (or owned by the companion),
* we know we can/must resume the HC (and mustn't reset it).
*/
Index: linux-2.6.14-benh/drivers/usb/host/ehci-q.c
===================================================================
--- linux-2.6.14-benh.orig/drivers/usb/host/ehci-q.c 2005-10-31 10:54:44.000000000 +1100
+++ linux-2.6.14-benh/drivers/usb/host/ehci-q.c 2005-11-03 17:03:27.000000000 +1100
@@ -926,6 +926,11 @@
#endif
spin_lock_irqsave (&ehci->lock, flags);
+ if (HC_IS_SUSPENDED(ehci_to_hcd(ehci)->state)) {
+ spin_unlock_irqrestore (&ehci->lock, flags);
+ return -ESHUTDOWN;
+ }
+
qh = qh_append_tds (ehci, urb, qtd_list, epnum, &ep->hcpriv);
/* Control/bulk operations through TTs don't need scheduling,
Index: linux-2.6.14-benh/drivers/usb/host/ehci-sched.c
===================================================================
--- linux-2.6.14-benh.orig/drivers/usb/host/ehci-sched.c 2005-10-31 10:54:44.000000000 +1100
+++ linux-2.6.14-benh/drivers/usb/host/ehci-sched.c 2005-11-03 17:05:54.000000000 +1100
@@ -602,6 +602,11 @@
spin_lock_irqsave (&ehci->lock, flags);
+ if (HC_IS_SUSPENDED(ehci_to_hcd(ehci)->state)) {
+ spin_unlock_irqrestore (&ehci->lock, flags);
+ return -ESHUTDOWN;
+ }
+
/* get qh and force any scheduling errors */
INIT_LIST_HEAD (&empty);
qh = qh_append_tds (ehci, urb, &empty, epnum, &ep->hcpriv);
@@ -1456,6 +1461,11 @@
/* schedule ... need to lock */
spin_lock_irqsave (&ehci->lock, flags);
+ if (HC_IS_SUSPENDED(ehci_to_hcd(ehci)->state)) {
+ spin_unlock_irqrestore (&ehci->lock, flags);
+ status = -ESHUTDOWN;
+ goto done;
+ }
status = iso_stream_schedule (ehci, urb, stream);
if (likely (status == 0))
itd_link_urb (ehci, urb, ehci->periodic_size << 3, stream);
@@ -1815,6 +1825,11 @@
/* schedule ... need to lock */
spin_lock_irqsave (&ehci->lock, flags);
+ if (HC_IS_SUSPENDED(ehci_to_hcd(ehci)->state)) {
+ spin_unlock_irqrestore (&ehci->lock, flags);
+ status = -ESHUTDOWN;
+ goto done;
+ }
status = iso_stream_schedule (ehci, urb, stream);
if (status == 0)
sitd_link_urb (ehci, urb, ehci->periodic_size << 3, stream);
Index: linux-2.6.14-benh/drivers/usb/host/ohci-hcd.c
===================================================================
--- linux-2.6.14-benh.orig/drivers/usb/host/ohci-hcd.c 2005-10-31 10:54:44.000000000 +1100
+++ linux-2.6.14-benh/drivers/usb/host/ohci-hcd.c 2005-11-06 08:34:41.000000000 +1100
@@ -252,6 +252,10 @@
spin_lock_irqsave (&ohci->lock, flags);
+ if (HC_IS_SUSPENDED(hcd->state)) {
+ retval = -ESHUTDOWN;
+ goto fail;
+ }
/* don't submit to a dead HC */
if (!HC_IS_RUNNING(hcd->state)) {
retval = -ENODEV;
Index: linux-2.6.14-benh/drivers/usb/host/ohci-hub.c
===================================================================
--- linux-2.6.14-benh.orig/drivers/usb/host/ohci-hub.c 2005-10-31 10:54:44.000000000 +1100
+++ linux-2.6.14-benh/drivers/usb/host/ohci-hub.c 2005-11-05 13:12:24.000000000 +1100
@@ -139,6 +139,9 @@
u32 temp, enables;
int status = -EINPROGRESS;
+ if (test_bit(HC_FLAG_SUSPEND_RH, &hcd->bitflags))
+ return -ESHUTDOWN;
+
if (time_before (jiffies, ohci->next_statechange))
msleep(5);
@@ -219,13 +222,6 @@
/* Sometimes PCI D3 suspend trashes frame timings ... */
periodic_reinit (ohci);
- /* interrupts might have been disabled */
- ohci_writel (ohci, OHCI_INTR_INIT, &ohci->regs->intrenable);
- if (ohci->ed_rm_list)
- ohci_writel (ohci, OHCI_INTR_SF, &ohci->regs->intrenable);
- ohci_writel (ohci, ohci_readl (ohci, &ohci->regs->intrstatus),
- &ohci->regs->intrstatus);
-
/* Then re-enable operations */
ohci_writel (ohci, OHCI_USB_OPER, &ohci->regs->control);
(void) ohci_readl (ohci, &ohci->regs->control);
@@ -241,6 +237,13 @@
/* TRSMRCY */
msleep (10);
+ /* interrupts might have been disabled */
+ ohci_writel (ohci, OHCI_INTR_INIT, &ohci->regs->intrenable);
+ if (ohci->ed_rm_list)
+ ohci_writel (ohci, OHCI_INTR_SF, &ohci->regs->intrenable);
+ ohci_writel (ohci, ohci_readl (ohci, &ohci->regs->intrstatus),
+ &ohci->regs->intrstatus);
+
/* keep it alive for ~5x suspend + resume costs */
ohci->next_statechange = jiffies + msecs_to_jiffies (250);
@@ -308,6 +311,9 @@
int can_suspend = hcd->can_wakeup;
unsigned long flags;
+ if (test_bit(HC_FLAG_SUSPEND_RH, &hcd->bitflags))
+ return 0;
+
spin_lock_irqsave (&ohci->lock, flags);
/* handle autosuspended root: finish resuming before
@@ -441,6 +447,9 @@
return -EINVAL;
port--;
+ if (test_bit(HC_FLAG_SUSPEND_RH, &hcd->bitflags))
+ return -ESHUTDOWN;
+
/* start port reset before HNP protocol times out */
status = ohci_readl(ohci, &ohci->regs->roothub.portstatus [port]);
if (!(status & RH_PS_CCS))
@@ -526,6 +535,9 @@
u32 temp;
int retval = 0;
+ if (test_bit(HC_FLAG_SUSPEND_RH, &hcd->bitflags))
+ return -ESHUTDOWN;
+
switch (typeReq) {
case ClearHubFeature:
switch (wValue) {
Index: linux-2.6.14-benh/drivers/usb/host/ohci-pci.c
===================================================================
--- linux-2.6.14-benh.orig/drivers/usb/host/ohci-pci.c 2005-10-31 10:52:24.000000000 +1100
+++ linux-2.6.14-benh/drivers/usb/host/ohci-pci.c 2005-11-05 12:46:53.000000000 +1100
@@ -14,13 +14,6 @@
* This file is licenced under the GPL.
*/
-#ifdef CONFIG_PPC_PMAC
-#include <asm/machdep.h>
-#include <asm/pmac_feature.h>
-#include <asm/pci-bridge.h>
-#include <asm/prom.h>
-#endif
-
#ifndef CONFIG_PCI
#error "This file is PCI bus glue. CONFIG_PCI must be defined."
#endif
@@ -118,6 +111,15 @@
if (time_before (jiffies, ohci->next_statechange))
msleep (100);
+ /* Disable emission of interrupts during suspend */
+ ohci_writel(ohci, OHCI_INTR_MIE, &ohci->regs->intrdisable);
+ mb();
+ clear_bit(HC_FLAG_IRQ_ON, &hcd->bitflags);
+ synchronize_irq(dev->irq);
+
+ /* Tell root hub not to bother trying to resume */
+ set_bit(HC_FLAG_SUSPEND_RH, &hcd->bitflags);
+
#ifdef CONFIG_USB_SUSPEND
(void) usb_suspend_device (hcd->self.root_hub, message);
#else
@@ -129,16 +131,6 @@
/* let things settle down a bit */
msleep (100);
-#ifdef CONFIG_PPC_PMAC
- if (_machine == _MACH_Pmac) {
- struct device_node *of_node;
-
- /* Disable USB PAD & cell clock */
- of_node = pci_device_to_OF_node (to_pci_dev(hcd->self.controller));
- if (of_node)
- pmac_call_feature(PMAC_FTR_USB_ENABLE, of_node, 0, 0);
- }
-#endif /* CONFIG_PPC_PMAC */
return 0;
}
@@ -148,20 +140,13 @@
struct ohci_hcd *ohci = hcd_to_ohci (hcd);
int retval = 0;
-#ifdef CONFIG_PPC_PMAC
- if (_machine == _MACH_Pmac) {
- struct device_node *of_node;
-
- /* Re-enable USB PAD & cell clock */
- of_node = pci_device_to_OF_node (to_pci_dev(hcd->self.controller));
- if (of_node)
- pmac_call_feature (PMAC_FTR_USB_ENABLE, of_node, 0, 1);
- }
-#endif /* CONFIG_PPC_PMAC */
-
/* resume root hub */
if (time_before (jiffies, ohci->next_statechange))
msleep (100);
+
+ clear_bit(HC_FLAG_SUSPEND_RH, &hcd->bitflags);
+ set_bit(HC_FLAG_IRQ_ON, &hcd->bitflags);
+
#ifdef CONFIG_USB_SUSPEND
/* get extra cleanup even if remote wakeup isn't in use */
retval = usb_resume_device (hcd->self.root_hub);
Index: linux-2.6.14-benh/drivers/usb/core/hcd.c
===================================================================
--- linux-2.6.14-benh.orig/drivers/usb/core/hcd.c 2005-10-31 10:54:44.000000000 +1100
+++ linux-2.6.14-benh/drivers/usb/core/hcd.c 2005-11-05 11:56:48.000000000 +1100
@@ -1600,7 +1600,8 @@
struct usb_hcd *hcd = __hcd;
int start = hcd->state;
- if (start == HC_STATE_HALT)
+ if (start == HC_STATE_HALT ||
+ !test_bit(HC_FLAG_IRQ_ON, &hcd->bitflags))
return IRQ_NONE;
if (hcd->driver->irq (hcd, r) == IRQ_NONE)
return IRQ_NONE;
@@ -1736,6 +1737,9 @@
if (hcd->driver->irq) {
char buf[8], *bufp = buf;
+ set_bit(HC_FLAG_IRQ_ON, &hcd->bitflags);
+ wmb();
+
#ifdef __sparc__
bufp = __irq_itoa(irqnum);
#else
Index: linux-2.6.14-benh/drivers/usb/core/hcd.h
===================================================================
--- linux-2.6.14-benh.orig/drivers/usb/core/hcd.h 2005-10-31 10:54:44.000000000 +1100
+++ linux-2.6.14-benh/drivers/usb/core/hcd.h 2005-11-05 12:19:11.000000000 +1100
@@ -71,6 +71,10 @@
/*
* hardware info/state
*/
+ unsigned long bitflags; /* various single-bit flags */
+#define HC_FLAG_IRQ_ON 0
+#define HC_FLAG_SUSPEND_RH 1
+
const struct hc_driver *driver; /* hw-specific hooks */
unsigned saw_irq : 1;
unsigned can_wakeup:1; /* hw supports wakeup? */
Index: linux-2.6.14-benh/drivers/usb/host/ehci-hub.c
===================================================================
--- linux-2.6.14-benh.orig/drivers/usb/host/ehci-hub.c 2005-10-31 10:54:44.000000000 +1100
+++ linux-2.6.14-benh/drivers/usb/host/ehci-hub.c 2005-11-05 13:12:39.000000000 +1100
@@ -90,8 +90,12 @@
int i;
int intr_enable;
+ if (test_bit(HC_FLAG_SUSPEND_RH, &hcd->bitflags))
+ return -ESHUTDOWN;
+
if (time_before (jiffies, ehci->next_statechange))
msleep(5);
+
spin_lock_irq (&ehci->lock);
/* re-init operational registers in case we lost power */
@@ -215,7 +219,8 @@
unsigned long flags;
/* if !USB_SUSPEND, root hub timers won't get shut down ... */
- if (!HC_IS_RUNNING(hcd->state))
+ if (!HC_IS_RUNNING(hcd->state) ||
+ test_bit(HC_FLAG_SUSPEND_RH, &hcd->bitflags))
return 0;
/* init status to no-changes */
@@ -313,6 +318,8 @@
unsigned long flags;
int retval = 0;
+ if (test_bit(HC_FLAG_SUSPEND_RH, &hcd->bitflags))
+ return -ESHUTDOWN;
/*
* FIXME: support SetPortFeatures USB_PORT_FEAT_INDICATOR.
* HCS_INDICATOR may say we can change LEDs to off/amber/green.
Index: linux-2.6.14-benh/drivers/usb/host/uhci-hcd.c
===================================================================
--- linux-2.6.14-benh.orig/drivers/usb/host/uhci-hcd.c 2005-10-31 10:54:44.000000000 +1100
+++ linux-2.6.14-benh/drivers/usb/host/uhci-hcd.c 2005-11-06 08:35:39.000000000 +1100
@@ -770,6 +770,12 @@
dev_dbg(uhci_dev(uhci), "%s\n", __FUNCTION__);
+ /* Disable emission of interrupts during suspend */
+ pci_write_config_word(to_pci_dev(uhci_dev(uhci)), USBLEGSUP, 0);
+ mb();
+ clear_bit(HC_FLAG_IRQ_ON, &hcd->bitflags);
+ synchronize_irq(dev->irq);
+
spin_lock_irq(&uhci->lock);
if (uhci->hc_inaccessible) /* Dead or already suspended */
goto done;
@@ -787,7 +793,8 @@
};
/* All PCI host controllers are required to disable IRQ generation
- * at the source, so we must turn off PIRQ.
+ * at the source, so we must turn off PIRQ. Already done earlier
+ * but better be safe than sorry...
*/
pci_write_config_word(to_pci_dev(uhci_dev(uhci)), USBLEGSUP, 0);
uhci->hc_inaccessible = 1;
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