USB: add NO_D3_DURING_SLEEP flag and revert 151b61284776be2

commit c2fb8a3fa25513de8fedb38509b1f15a5bbee47b upstream.

This patch (as1558) fixes a problem affecting several ASUS computers:
The machine crashes or corrupts memory when going into suspend if the
ehci-hcd driver is bound to any controllers.  Users have been forced
to unbind or unload ehci-hcd before putting their systems to sleep.

After extensive testing, it was determined that the machines don't
like going into suspend when any EHCI controllers are in the PCI D3
power state.  Presumably this is a firmware bug, but there's nothing
we can do about it except to avoid putting the controllers in D3
during system sleep.

The patch adds a new flag to indicate whether the problem is present,
and avoids changing the controller's power state if the flag is set.
Runtime suspend is unaffected; this matters only for system suspend.
However as a side effect, the controller will not respond to remote
wakeup requests while the system is asleep.  Hence USB wakeup is not
functional -- but of course, this is already true in the current state
of affairs.

A similar patch has already been applied as commit
151b61284776be2d6f02d48c23c3625678960b97 (USB: EHCI: fix crash during
suspend on ASUS computers).  The patch supersedes that one and reverts
it.  There are two differences:

	The old patch added the flag at the USB level; this patch
	adds it at the PCI level.

	The old patch applied to all chipsets with the same vendor,
	subsystem vendor, and product IDs; this patch makes an
	exception for a known-good system (based on DMI information).

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Tested-by: Dâniel Fraga <fragabr@gmail.com>
Tested-by: Andrey Rahmatullin <wrar@wrar.name>
Tested-by: Steven Rostedt <rostedt@goodmis.org>
Reviewed-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 111569ccab434dda8262e1ddeb3a9aab04043171..f597a1aa5e69c981794262fab68959eea6420ca1 100644 (file)
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -1743,6 +1743,11 @@ int pci_prepare_to_sleep(struct pci_dev *dev)
        if (target_state == PCI_POWER_ERROR)
                return -EIO;
 
+       /* Some devices mustn't be in D3 during system sleep */
+       if (target_state == PCI_D3hot &&
+                       (dev->dev_flags & PCI_DEV_FLAGS_NO_D3_DURING_SLEEP))
+               return 0;
+
        pci_enable_wake(dev, target_state, device_may_wakeup(&dev->dev));
 
        error = pci_set_power_state(dev, target_state);

diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 4bf71028556b995bd48c0ea9caec081445fa4234..bf33f0b7f95706bcd249290e53920ebd3c0b5019 100644 (file)
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -2917,6 +2917,32 @@ static void __devinit disable_igfx_irq(struct pci_dev *dev)
 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, 0x0102, disable_igfx_irq);
 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, 0x010a, disable_igfx_irq);
 
+/*
+ * The Intel 6 Series/C200 Series chipset's EHCI controllers on many
+ * ASUS motherboards will cause memory corruption or a system crash
+ * if they are in D3 while the system is put into S3 sleep.
+ */
+static void __devinit asus_ehci_no_d3(struct pci_dev *dev)
+{
+       const char *sys_info;
+       static const char good_Asus_board[] = "P8Z68-V";
+
+       if (dev->dev_flags & PCI_DEV_FLAGS_NO_D3_DURING_SLEEP)
+               return;
+       if (dev->subsystem_vendor != PCI_VENDOR_ID_ASUSTEK)
+               return;
+       sys_info = dmi_get_system_info(DMI_BOARD_NAME);
+       if (sys_info && memcmp(sys_info, good_Asus_board,
+                       sizeof(good_Asus_board) - 1) == 0)
+               return;
+
+       dev_info(&dev->dev, "broken D3 during system sleep on ASUS\n");
+       dev->dev_flags |= PCI_DEV_FLAGS_NO_D3_DURING_SLEEP;
+       device_set_wakeup_capable(&dev->dev, false);
+}
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, 0x1c26, asus_ehci_no_d3);
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, 0x1c2d, asus_ehci_no_d3);
+
 static void pci_do_fixups(struct pci_dev *dev, struct pci_fixup *f,
                          struct pci_fixup *end)
 {

diff --git a/drivers/usb/core/hcd-pci.c b/drivers/usb/core/hcd-pci.c
index 57ed9e400c06d938a91fd9713b95a9e97030b3a3..622b4a48e732e7a83b6c760d6563994394b0caa9 100644 (file)
--- a/drivers/usb/core/hcd-pci.c
+++ b/drivers/usb/core/hcd-pci.c
@@ -493,15 +493,6 @@ static int hcd_pci_suspend_noirq(struct device *dev)
 
        pci_save_state(pci_dev);
 
-       /*
-        * Some systems crash if an EHCI controller is in D3 during
-        * a sleep transition.  We have to leave such controllers in D0.
-        */
-       if (hcd->broken_pci_sleep) {
-               dev_dbg(dev, "Staying in PCI D0\n");
-               return retval;
-       }
-
        /* If the root hub is dead rather than suspended, disallow remote
         * wakeup.  usb_hc_died() should ensure that both hosts are marked as
         * dying, so we only need to check the primary roothub.

diff --git a/drivers/usb/host/ehci-pci.c b/drivers/usb/host/ehci-pci.c
index bc94d7bf072d822fb32da0867b6759dec223f69a..123481793a47afcdfc22cf476a8a8ed14301c6e1 100644 (file)
--- a/drivers/usb/host/ehci-pci.c
+++ b/drivers/usb/host/ehci-pci.c
@@ -144,14 +144,6 @@ static int ehci_pci_setup(struct usb_hcd *hcd)
                        hcd->has_tt = 1;
                        tdi_reset(ehci);
                }
-               if (pdev->subsystem_vendor == PCI_VENDOR_ID_ASUSTEK) {
-                       /* EHCI #1 or #2 on 6 Series/C200 Series chipset */
-                       if (pdev->device == 0x1c26 || pdev->device == 0x1c2d) {
-                               ehci_info(ehci, "broken D3 during system sleep on ASUS\n");
-                               hcd->broken_pci_sleep = 1;
-                               device_set_wakeup_capable(&pdev->dev, false);
-                       }
-               }
                break;
        case PCI_VENDOR_ID_TDI:
                if (pdev->device == PCI_DEVICE_ID_TDI_EHCI) {

diff --git a/include/linux/pci.h b/include/linux/pci.h
index e444f5b491188566b8a7107182fd24584d92fea2..8b2921ad51a9516caa9edd7d58ed5f692625841c 100644 (file)
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -176,6 +176,8 @@ enum pci_dev_flags {
        PCI_DEV_FLAGS_NO_D3 = (__force pci_dev_flags_t) 2,
        /* Provide indication device is assigned by a Virtual Machine Manager */
        PCI_DEV_FLAGS_ASSIGNED = (__force pci_dev_flags_t) 4,
+       /* Device causes system crash if in D3 during S3 sleep */
+       PCI_DEV_FLAGS_NO_D3_DURING_SLEEP = (__force pci_dev_flags_t) 8,
 };
 
 enum pci_irq_reroute_variant {

diff --git a/include/linux/usb/hcd.h b/include/linux/usb/hcd.h
index d28cc78a38e442e75e435c0dede140291c57ce2c..5de415707c234f0e54939195062b5dc39f0a1c06 100644 (file)
--- a/include/linux/usb/hcd.h
+++ b/include/linux/usb/hcd.h
@@ -126,8 +126,6 @@ struct usb_hcd {
        unsigned                wireless:1;     /* Wireless USB HCD */
        unsigned                authorized_default:1;
        unsigned                has_tt:1;       /* Integrated TT in root hub */
-       unsigned                broken_pci_sleep:1;     /* Don't put the
-                       controller in PCI-D3 for system sleep */
 
        unsigned int            irq;            /* irq allocated */
        void __iomem            *regs;          /* device memory/io */