OHCI: fix regression upon awakening from hibernation

commit 43bbb7e015c4380064796c5868b536437b165615 in upstream

Drivers in the ohci-hcd family should perform certain tasks whenever
their controller device is resumed.  These include checking for loss
of power during suspend, turning on port power, and enabling interrupt
requests.

Until now these jobs have been carried out when the root hub is
resumed, not when the controller is.  Many drivers work around the
resulting awkwardness by automatically resuming their root hub
whenever the controller is resumed.  But this is wasteful and
unnecessary.

In 2.6.25, ohci-pci doesn't even do that.  After waking up from
hibernation, it simply leaves the controller in a RESET state, which
is useless.

To simplify the situation, this patch (as1066b) adds a new core
routine, ohci_finish_controller_resume(), which can be used by all the
OHCI-variant drivers.  They can call the new routine instead of
resuming their root hubs.  And ohci-pci.c can call it instead of using
its own special-purpose handler.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

8 files changed, 50 insertions, 47 deletions

diff --git a/drivers/usb/host/ohci-at91.c b/drivers/usb/host/ohci-at91.c
index d72dc07dda01..e534f9de0f05 100644
--- a/drivers/usb/host/ohci-at91.c
+++ b/drivers/usb/host/ohci-at91.c
@@ -348,6 +348,7 @@ static int ohci_hcd_at91_drv_resume(struct platform_device *pdev)
 	if (!clocked)
 		at91_start_clock();
 
+	ohci_finish_controller_resume(hcd);
 	return 0;
 }
 #else
diff --git a/drivers/usb/host/ohci-ep93xx.c b/drivers/usb/host/ohci-ep93xx.c
index 156e93a9d0df..963ed60cef42 100644
--- a/drivers/usb/host/ohci-ep93xx.c
+++ b/drivers/usb/host/ohci-ep93xx.c
@@ -194,8 +194,8 @@ static int ohci_hcd_ep93xx_drv_resume(struct platform_device *pdev)
 
 	ep93xx_start_hc(&pdev->dev);
 	pdev->dev.power.power_state = PMSG_ON;
-	usb_hcd_resume_root_hub(hcd);
 
+	ohci_finish_controller_resume(hcd);
 	return 0;
 }
 #endif
diff --git a/drivers/usb/host/ohci-hub.c b/drivers/usb/host/ohci-hub.c
index 48e4b11f4d3e..9eff2de5a801 100644
--- a/drivers/usb/host/ohci-hub.c
+++ b/drivers/usb/host/ohci-hub.c
@@ -326,6 +326,49 @@ static int ohci_bus_resume (struct usb_hcd *hcd)
 	return rc;
 }
 
+/* Carry out the final steps of resuming the controller device */
+static void ohci_finish_controller_resume(struct usb_hcd *hcd)
+{
+	struct ohci_hcd		*ohci = hcd_to_ohci(hcd);
+	int			port;
+	bool			need_reinit = false;
+
+	/* See if the controller is already running or has been reset */
+	ohci->hc_control = ohci_readl(ohci, &ohci->regs->control);
+	if (ohci->hc_control & (OHCI_CTRL_IR | OHCI_SCHED_ENABLES)) {
+		need_reinit = true;
+	} else {
+		switch (ohci->hc_control & OHCI_CTRL_HCFS) {
+		case OHCI_USB_OPER:
+		case OHCI_USB_RESET:
+			need_reinit = true;
+		}
+	}
+
+	/* If needed, reinitialize and suspend the root hub */
+	if (need_reinit) {
+		spin_lock_irq(&ohci->lock);
+		hcd->state = HC_STATE_RESUMING;
+		ohci_rh_resume(ohci);
+		hcd->state = HC_STATE_QUIESCING;
+		ohci_rh_suspend(ohci, 0);
+		hcd->state = HC_STATE_SUSPENDED;
+		spin_unlock_irq(&ohci->lock);
+	}
+
+	/* Normally just turn on port power and enable interrupts */
+	else {
+		ohci_dbg(ohci, "powerup ports\n");
+		for (port = 0; port < ohci->num_ports; port++)
+			ohci_writel(ohci, RH_PS_PPS,
+					&ohci->regs->roothub.portstatus[port]);
+
+		ohci_writel(ohci, OHCI_INTR_MIE, &ohci->regs->intrenable);
+		ohci_readl(ohci, &ohci->regs->intrenable);
+		msleep(20);
+	}
+}
+
 /* Carry out polling-, autostop-, and autoresume-related state changes */
 static int ohci_root_hub_state_changes(struct ohci_hcd *ohci, int changed,
 		int any_connected)
diff --git a/drivers/usb/host/ohci-omap.c b/drivers/usb/host/ohci-omap.c
index 7bfca1ed1b58..611bc9f3a8ae 100644
--- a/drivers/usb/host/ohci-omap.c
+++ b/drivers/usb/host/ohci-omap.c
@@ -519,7 +519,7 @@ static int ohci_omap_resume(struct platform_device *dev)
 
 	omap_ohci_clock_power(1);
 	dev->dev.power.power_state = PMSG_ON;
-	usb_hcd_resume_root_hub(platform_get_drvdata(dev));
+	ohci_finish_controller_resume(hcd);
 	return 0;
 }
 
diff --git a/drivers/usb/host/ohci-pci.c b/drivers/usb/host/ohci-pci.c
index b0e2275755c8..b4886e1de3b7 100644
--- a/drivers/usb/host/ohci-pci.c
+++ b/drivers/usb/host/ohci-pci.c
@@ -238,42 +238,6 @@ static int __devinit ohci_pci_start (struct usb_hcd *hcd)
 	return ret;
 }
 
-#if	defined(CONFIG_USB_PERSIST) && (defined(CONFIG_USB_EHCI_HCD) || \
-		defined(CONFIG_USB_EHCI_HCD_MODULE))
-
-/* Following a power loss, we must prepare to regain control of the ports
- * we used to own.  This means turning on the port power before ehci-hcd
- * tries to switch ownership.
- *
- * This isn't a 100% perfect solution.  On most systems the OHCI controllers
- * lie at lower PCI addresses than the EHCI controller, so they will be
- * discovered (and hence resumed) first.  But there is no guarantee things
- * will always work this way.  If the EHCI controller is resumed first and
- * the OHCI ports are unpowered, then the handover will fail.
- */
-static void prepare_for_handover(struct usb_hcd *hcd)
-{
-	struct ohci_hcd	*ohci = hcd_to_ohci(hcd);
-	int		port;
-
-	/* Here we "know" root ports should always stay powered */
-	ohci_dbg(ohci, "powerup ports\n");
-	for (port = 0; port < ohci->num_ports; port++)
-		ohci_writel(ohci, RH_PS_PPS,
-				&ohci->regs->roothub.portstatus[port]);
-
-	/* Flush those writes */
-	ohci_readl(ohci, &ohci->regs->control);
-	msleep(20);
-}
-
-#else
-
-static inline void prepare_for_handover(struct usb_hcd *hcd)
-{ }
-
-#endif	/* CONFIG_USB_PERSIST etc. */
-
 #ifdef	CONFIG_PM
 
 static int ohci_pci_suspend (struct usb_hcd *hcd, pm_message_t message)
@@ -312,13 +276,8 @@ static int ohci_pci_suspend (struct usb_hcd *hcd, pm_message_t message)
 
 static int ohci_pci_resume (struct usb_hcd *hcd)
 {
-	struct ohci_hcd	*ohci = hcd_to_ohci(hcd);
-
 	set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
-
-	/* FIXME: we should try to detect loss of VBUS power here */
-	prepare_for_handover(hcd);
-	ohci_writel(ohci, OHCI_INTR_MIE, &ohci->regs->intrenable);
+	ohci_finish_controller_resume(hcd);
 	return 0;
 }
 
diff --git a/drivers/usb/host/ohci-pxa27x.c b/drivers/usb/host/ohci-pxa27x.c
index 8ad9b3b604b5..3de3b00b7da7 100644
--- a/drivers/usb/host/ohci-pxa27x.c
+++ b/drivers/usb/host/ohci-pxa27x.c
@@ -358,8 +358,7 @@ static int ohci_hcd_pxa27x_drv_resume(struct platform_device *pdev)
 		return status;
 
 	pdev->dev.power.power_state = PMSG_ON;
-	usb_hcd_resume_root_hub(hcd);
-
+	ohci_finish_controller_resume(hcd);
 	return 0;
 }
 #endif
diff --git a/drivers/usb/host/ohci-sm501.c b/drivers/usb/host/ohci-sm501.c
index 4ea92762fb28..c852f0356fe8 100644
--- a/drivers/usb/host/ohci-sm501.c
+++ b/drivers/usb/host/ohci-sm501.c
@@ -239,7 +239,7 @@ static int ohci_sm501_resume(struct platform_device *pdev)
 
 	sm501_unit_power(dev->parent, SM501_GATE_USB_HOST, 1);
 	dev->power.power_state = PMSG_ON;
-	usb_hcd_resume_root_hub(platform_get_drvdata(pdev));
+	ohci_finish_controller_resume(hcd);
 	return 0;
 }
 #endif
diff --git a/drivers/usb/host/ohci-ssb.c b/drivers/usb/host/ohci-ssb.c
index 6e9c2d6db887..1c0867a52ebd 100644
--- a/drivers/usb/host/ohci-ssb.c
+++ b/drivers/usb/host/ohci-ssb.c
@@ -224,6 +224,7 @@ static int ssb_ohci_resume(struct ssb_device *dev)
 
 	ssb_device_enable(dev, ohcidev->enable_flags);
 
+	ohci_finish_controller_resume(hcd);
 	return 0;
 }