OHCI: work around for nVidia shutdown problem

This patch (as1417) fixes a problem affecting some (or all) nVidia
chipsets.  When the computer is shut down, the OHCI controllers
continue to power the USB buses and evidently they drive a Reset
signal out all their ports.  This prevents attached devices from going
to low power.  Mouse LEDs stay on, for example, which is disconcerting
for users and a drain on laptop batteries.

The fix involves leaving each OHCI controller in the OPERATIONAL state
during system shutdown rather than putting it in the RESET state.
Although this nominally means the controller is running, in fact it's
not doing very much since all the schedules are all disabled.  However
there is ongoing DMA to the Host Controller Communications Area, so
the patch also disables the bus-master capability of all PCI USB
controllers after the shutdown routine runs.

The fix is applied only to nVidia-based PCI OHCI controllers, so it
shouldn't cause problems on systems using other hardware.  As an added
safety measure, in case the kernel encounters one of these running
controllers during boot, the patch changes quirk_usb_handoff_ohci()
(which runs early on during PCI discovery) to reset the controller
before anything bad can happen.

Reported-by: Pali Rohár <pali.rohar@gmail.com>
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
CC: David Brownell <david-b@pacbell.net>
Tested-by: Pali Rohár <pali.rohar@gmail.com>
CC: stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

4 files changed, 38 insertions, 8 deletions

diff --git a/drivers/usb/host/ohci-hcd.c b/drivers/usb/host/ohci-hcd.c
index c3b4ccc7337..8ef3c194436 100644
--- a/drivers/usb/host/ohci-hcd.c
+++ b/drivers/usb/host/ohci-hcd.c
@@ -398,7 +398,14 @@ ohci_shutdown (struct usb_hcd *hcd)
 
 	ohci = hcd_to_ohci (hcd);
 	ohci_writel (ohci, OHCI_INTR_MIE, &ohci->regs->intrdisable);
-	ohci_usb_reset (ohci);
+	ohci->hc_control = ohci_readl(ohci, &ohci->regs->control);
+
+	/* If the SHUTDOWN quirk is set, don't put the controller in RESET */
+	ohci->hc_control &= (ohci->flags & OHCI_QUIRK_SHUTDOWN ?
+			OHCI_CTRL_RWC | OHCI_CTRL_HCFS :
+			OHCI_CTRL_RWC);
+	ohci_writel(ohci, ohci->hc_control, &ohci->regs->control);
+
 	/* flush the writes */
 	(void) ohci_readl (ohci, &ohci->regs->control);
 }
diff --git a/drivers/usb/host/ohci-pci.c b/drivers/usb/host/ohci-pci.c
index 6bdc8b25a6a..36ee9a666e9 100644
--- a/drivers/usb/host/ohci-pci.c
+++ b/drivers/usb/host/ohci-pci.c
@@ -201,6 +201,20 @@ static int ohci_quirk_amd700(struct usb_hcd *hcd)
 	return 0;
 }
 
+/* nVidia controllers continue to drive Reset signalling on the bus
+ * even after system shutdown, wasting power.  This flag tells the
+ * shutdown routine to leave the controller OPERATIONAL instead of RESET.
+ */
+static int ohci_quirk_nvidia_shutdown(struct usb_hcd *hcd)
+{
+	struct ohci_hcd	*ohci = hcd_to_ohci(hcd);
+
+	ohci->flags |= OHCI_QUIRK_SHUTDOWN;
+	ohci_dbg(ohci, "enabled nVidia shutdown quirk\n");
+
+	return 0;
+}
+
 /*
  * The hardware normally enables the A-link power management feature, which
  * lets the system lower the power consumption in idle states.
@@ -332,6 +346,10 @@ static const struct pci_device_id ohci_pci_quirks[] = {
 		PCI_DEVICE(PCI_VENDOR_ID_ATI, 0x4399),
 		.driver_data = (unsigned long)ohci_quirk_amd700,
 	},
+	{
+		PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_ANY_ID),
+		.driver_data = (unsigned long) ohci_quirk_nvidia_shutdown,
+	},
 
 	/* FIXME for some of the early AMD 760 southbridges, OHCI
 	 * won't work at all.  blacklist them.
diff --git a/drivers/usb/host/ohci.h b/drivers/usb/host/ohci.h
index 5bf15fed0d9..51facb985c8 100644
--- a/drivers/usb/host/ohci.h
+++ b/drivers/usb/host/ohci.h
@@ -403,6 +403,7 @@ struct ohci_hcd {
 #define	OHCI_QUIRK_HUB_POWER	0x100			/* distrust firmware power/oc setup */
 #define	OHCI_QUIRK_AMD_ISO	0x200			/* ISO transfers*/
 #define	OHCI_QUIRK_AMD_PREFETCH	0x400			/* pre-fetch for ISO transfer */
+#define	OHCI_QUIRK_SHUTDOWN	0x800			/* nVidia power bug */
 	// there are also chip quirks/bugs in init logic
 
 	struct work_struct	nec_work;	/* Worker for NEC quirk */
diff --git a/drivers/usb/host/pci-quirks.c b/drivers/usb/host/pci-quirks.c
index 83b5f9cea85..464ed977b45 100644
--- a/drivers/usb/host/pci-quirks.c
+++ b/drivers/usb/host/pci-quirks.c
@@ -169,6 +169,7 @@ static int __devinit mmio_resource_enabled(struct pci_dev *pdev, int idx)
 static void __devinit quirk_usb_handoff_ohci(struct pci_dev *pdev)
 {
 	void __iomem *base;
+	u32 control;
 
 	if (!mmio_resource_enabled(pdev, 0))
 		return;
@@ -177,10 +178,14 @@ static void __devinit quirk_usb_handoff_ohci(struct pci_dev *pdev)
 	if (base == NULL)
 		return;
 
+	control = readl(base + OHCI_CONTROL);
+
 /* On PA-RISC, PDC can leave IR set incorrectly; ignore it there. */
-#ifndef __hppa__
-{
-	u32 control = readl(base + OHCI_CONTROL);
+#ifdef __hppa__
+#define	OHCI_CTRL_MASK		(OHCI_CTRL_RWC | OHCI_CTRL_IR)
+#else
+#define	OHCI_CTRL_MASK		OHCI_CTRL_RWC
+
 	if (control & OHCI_CTRL_IR) {
 		int wait_time = 500; /* arbitrary; 5 seconds */
 		writel(OHCI_INTR_OC, base + OHCI_INTRENABLE);
@@ -194,13 +199,12 @@ static void __devinit quirk_usb_handoff_ohci(struct pci_dev *pdev)
 			dev_warn(&pdev->dev, "OHCI: BIOS handoff failed"
 					" (BIOS bug?) %08x\n",
 					readl(base + OHCI_CONTROL));
-
-		/* reset controller, preserving RWC */
-		writel(control & OHCI_CTRL_RWC, base + OHCI_CONTROL);
 	}
-}
 #endif
 
+	/* reset controller, preserving RWC (and possibly IR) */
+	writel(control & OHCI_CTRL_MASK, base + OHCI_CONTROL);
+
 	/*
 	 * disable interrupts
 	 */