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[PATCH] USB: EHCI updates 

This fixes some bugs in EHCI suspend/resume that joined us over the past
few releases (as usbcore, PCI, pmcore, and other components evolved):

  - Removes suspend and resume recursion from the EHCI driver, getting
    rid of the USB_SUSPEND special casing.

  - Updates the wakeup mechanism to work again; there's a newish usbcore
    call it needs to use.

  - Provide simpler tests for "do we need to restart from scratch", to
    address another case where PCI Vaux was lost.  (In this case it was
    restoring a swsusp snapshot, but there could be others.)

Un-exports a symbol that was temporarily exported.

A notable change from previous version is that this doesn't move
the spinlock init, so there's still a resume/reinit path bug.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
David Brownell 2005-11-23 15:45:28 -08:00 committed by Linus Torvalds
parent b4723ae3cc
commit f03c17fc9a
4 changed files with 43 additions and 39 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/usb/core/hub.c
View File

@ -1669,7 +1669,6 @@ int usb_suspend_device(struct usb_device *udev)
return 0;
#endif
}
EXPORT_SYMBOL_GPL(usb_suspend_device);
/*
* If the USB "suspend" state is in use (rather than "global suspend"),

3
drivers/usb/host/ehci-hcd.c
View File

@ -636,9 +636,8 @@ static irqreturn_t ehci_irq (struct usb_hcd *hcd, struct pt_regs *regs)
* stop that signaling.
*/
ehci->reset_done [i] = jiffies + msecs_to_jiffies (20);
mod_timer (&hcd->rh_timer,
ehci->reset_done [i] + 1);
ehci_dbg (ehci, "port %d remote wakeup\n", i + 1);
usb_hcd_resume_root_hub(hcd);
}
}

7
drivers/usb/host/ehci-hub.c
View File

@ -94,6 +94,13 @@ static int ehci_bus_resume (struct usb_hcd *hcd)
msleep(5);
spin_lock_irq (&ehci->lock);
/* Ideally and we've got a real resume here, and no port's power
* was lost. (For PCI, that means Vaux was maintained.) But we
* could instead be restoring a swsusp snapshot -- so that BIOS was
* the last user of the controller, not reset/pm hardware keeping
* state we gave to it.
*/
/* re-init operational registers in case we lost power */
if (readl (&ehci->regs->intr_enable) == 0) {
/* at least some APM implementations will try to deliver

41
drivers/usb/host/ehci-pci.c
View File

@ -235,10 +235,11 @@ static void ehci_pci_stop (struct usb_hcd *hcd)
/* suspend/resume, section 4.3 */
/* These routines rely on the bus (pci, platform, etc)
/* These routines rely on the PCI bus glue
* to handle powerdown and wakeup, and currently also on
* transceivers that don't need any software attention to set up
* the right sort of wakeup.
* Also they depend on separate root hub suspend/resume.
*/
static int ehci_pci_suspend (struct usb_hcd *hcd, pm_message_t message)
@ -246,17 +247,9 @@ static int ehci_pci_suspend (struct usb_hcd *hcd, pm_message_t message)
struct ehci_hcd *ehci = hcd_to_ehci (hcd);
if (time_before (jiffies, ehci->next_statechange))
msleep (100);
msleep (10);
#ifdef CONFIG_USB_SUSPEND
(void) usb_suspend_device (hcd->self.root_hub);
#else
usb_lock_device (hcd->self.root_hub);
(void) ehci_bus_suspend (hcd);
usb_unlock_device (hcd->self.root_hub);
#endif
// save (PCI) FLADJ in case of Vaux power loss
// could save FLADJ in case of Vaux power loss
// ... we'd only use it to handle clock skew
return 0;
@ -269,13 +262,18 @@ static int ehci_pci_resume (struct usb_hcd *hcd)
struct usb_device *root = hcd->self.root_hub;
int retval = -EINVAL;
// maybe restore (PCI) FLADJ
// maybe restore FLADJ
if (time_before (jiffies, ehci->next_statechange))
msleep (100);
/* If CF is clear, we lost PCI Vaux power and need to restart. */
if (readl (&ehci->regs->configured_flag) != cpu_to_le32(FLAG_CF))
goto restart;
/* If any port is suspended (or owned by the companion),
* we know we can/must resume the HC (and mustn't reset it).
* We just defer that to the root hub code.
*/
for (port = HCS_N_PORTS (ehci->hcs_params); port > 0; ) {
u32 status;
@ -283,23 +281,25 @@ static int ehci_pci_resume (struct usb_hcd *hcd)
status = readl (&ehci->regs->port_status [port]);
if (!(status & PORT_POWER))
continue;
if (status & (PORT_SUSPEND | PORT_OWNER)) {
down (&hcd->self.root_hub->serialize);
retval = ehci_bus_resume (hcd);
up (&hcd->self.root_hub->serialize);
break;
if (status & (PORT_SUSPEND | PORT_RESUME | PORT_OWNER)) {
usb_hcd_resume_root_hub(hcd);
return 0;
}
}
restart:
ehci_dbg(ehci, "lost power, restarting\n");
for (port = HCS_N_PORTS (ehci->hcs_params); port > 0; ) {
port--;
if (!root->children [port])
continue;
dbg_port (ehci, __FUNCTION__, port + 1, status);
usb_set_device_state (root->children[port],
USB_STATE_NOTATTACHED);
}
/* Else reset, to cope with power loss or flush-to-storage
* style "resume" having activated BIOS during reboot.
* style "resume" having let BIOS kick in during reboot.
*/
if (port == 0) {
(void) ehci_halt (ehci);
(void) ehci_reset (ehci);
(void) ehci_pci_reset (hcd);
@ -318,7 +318,6 @@ static int ehci_pci_resume (struct usb_hcd *hcd)
* but some controllers may lose all power.
*/
ehci_port_power (ehci, 1);
}
return retval;
}