From f03c17fc9abe8582d6ad830290b3093fdf1eea61 Mon Sep 17 00:00:00 2001 From: David Brownell Date: Wed, 23 Nov 2005 15:45:28 -0800 Subject: [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 Signed-off-by: Greg Kroah-Hartman Signed-off-by: Linus Torvalds --- drivers/usb/host/ehci-hcd.c | 3 +- drivers/usb/host/ehci-hub.c | 7 +++++ drivers/usb/host/ehci-pci.c | 77 ++++++++++++++++++++++----------------------- 3 files changed, 46 insertions(+), 41 deletions(-) (limited to 'drivers/usb/host') diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c index af3c05eb86f..f15144e96e1 100644 --- a/drivers/usb/host/ehci-hcd.c +++ b/drivers/usb/host/ehci-hcd.c @@ -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); } } diff --git a/drivers/usb/host/ehci-hub.c b/drivers/usb/host/ehci-hub.c index 88cb4ada686..82caf336e9b 100644 --- a/drivers/usb/host/ehci-hub.c +++ b/drivers/usb/host/ehci-hub.c @@ -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 diff --git a/drivers/usb/host/ehci-pci.c b/drivers/usb/host/ehci-pci.c index dfd9bd0b182..0f2be91e5e0 100644 --- a/drivers/usb/host/ehci-pci.c +++ b/drivers/usb/host/ehci-pci.c @@ -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); - -#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 + msleep (10); - // 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; @@ -283,42 +281,43 @@ 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); - - /* emptying the schedule aborts any urbs */ - spin_lock_irq (&ehci->lock); - if (ehci->reclaim) - ehci->reclaim_ready = 1; - ehci_work (ehci, NULL); - spin_unlock_irq (&ehci->lock); - - /* restart; khubd will disconnect devices */ - retval = ehci_run (hcd); - - /* here we "know" root ports should always stay powered; - * but some controllers may lose all power. - */ - ehci_port_power (ehci, 1); - } + (void) ehci_halt (ehci); + (void) ehci_reset (ehci); + (void) ehci_pci_reset (hcd); + + /* emptying the schedule aborts any urbs */ + spin_lock_irq (&ehci->lock); + if (ehci->reclaim) + ehci->reclaim_ready = 1; + ehci_work (ehci, NULL); + spin_unlock_irq (&ehci->lock); + + /* restart; khubd will disconnect devices */ + retval = ehci_run (hcd); + + /* here we "know" root ports should always stay powered; + * but some controllers may lose all power. + */ + ehci_port_power (ehci, 1); return retval; } -- cgit v1.2.3