[PATCH] USB: ohci uses driver model wakeup flags

This makes OHCI use the driver model wakeup control bits for its root hub
(e.g. disable on amd756, because of chip erratum) and for the controller
itself.  It no longer uses the hcd glue bits with those roles, and depends
on the previous patch making the root hub available earlier.

Note that on most platforms (boot code properly setting the RWC bit) this
gives a partial workaround for the way PCI isn't currently flagging devices
that support PME# signals.  (Because of odd PCI init sequencing on PPC.)
That's because many OHCI controllers support "legacy PCI PM" ... without
involving any PCI PM capability.

USB wakeup from STR, if it works on your system, may still involve
tweaking things by hand in /proc/acpi/wakeup.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 13 insertions, 2 deletions

diff --git a/drivers/usb/host/ohci-pci.c b/drivers/usb/host/ohci-pci.c
index 1b09dde068e1..1bfe96f4d045 100644
--- a/drivers/usb/host/ohci-pci.c
+++ b/drivers/usb/host/ohci-pci.c
@@ -35,7 +35,10 @@ ohci_pci_start (struct usb_hcd *hcd)
         struct ohci_hcd *ohci = hcd_to_ohci (hcd);
         int             ret;
 
-        if(hcd->self.controller && hcd->self.controller->bus == &pci_bus_type) {
+        /* REVISIT this whole block should move to reset(), which handles
+         * all the other one-time init.
+         */
+        if (hcd->self.controller) {
                 struct pci_dev *pdev = to_pci_dev(hcd->self.controller);
 
                 /* AMD 756, for most chips (early revs), corrupts register
@@ -45,7 +48,8 @@ ohci_pci_start (struct usb_hcd *hcd)
                                 && pdev->device == 0x740c) {
                         ohci->flags = OHCI_QUIRK_AMD756;
                         ohci_dbg (ohci, "AMD756 erratum 4 workaround\n");
-                        // also somewhat erratum 10 (suspend/resume issues)
+                        /* also erratum 10 (suspend/resume issues) */
+                        device_init_wakeup(&hcd->self.root_hub->dev, 0);
                 }
 
                 /* FIXME for some of the early AMD 760 southbridges, OHCI
@@ -88,6 +92,13 @@ ohci_pci_start (struct usb_hcd *hcd)
                         ohci_dbg (ohci,
                                 "enabled Compaq ZFMicro chipset quirk\n");
                 }
+
+                /* RWC may not be set for add-in PCI cards, since boot
+                 * firmware probably ignored them.  This transfers PCI
+                 * PM wakeup capabilities (once the PCI layer is fixed).
+                 */
+                if (device_may_wakeup(&pdev->dev))
+                        ohci->hc_control |= OHCI_CTRL_RWC;
         }
 
         /* NOTE: there may have already been a first reset, to