1 files changed, 15 insertions, 3 deletions

diff --git a/drivers/usb/host/pci-quirks.c b/drivers/usb/host/pci-quirks.c
index dd483c13565b..ce636466edb7 100644
--- a/drivers/usb/host/pci-quirks.c
+++ b/drivers/usb/host/pci-quirks.c
@@ -567,7 +567,8 @@ static void quirk_usb_handoff_ohci(struct pci_dev *pdev)
 {
         void __iomem *base;
         u32 control;
-        u32 fminterval;
+        u32 fminterval = 0;
+        bool no_fminterval = false;
         int cnt;
 
         if (!mmio_resource_enabled(pdev, 0))
@@ -577,6 +578,13 @@ static void quirk_usb_handoff_ohci(struct pci_dev *pdev)
         if (base == NULL)
                 return;
 
+        /*
+         * ULi M5237 OHCI controller locks the whole system when accessing
+         * the OHCI_FMINTERVAL offset.
+         */
+        if (pdev->vendor == PCI_VENDOR_ID_AL && pdev->device == 0x5237)
+                no_fminterval = true;
+
         control = readl(base + OHCI_CONTROL);
 
 /* On PA-RISC, PDC can leave IR set incorrectly; ignore it there. */
@@ -615,7 +623,9 @@ static void quirk_usb_handoff_ohci(struct pci_dev *pdev)
         }
 
         /* software reset of the controller, preserving HcFmInterval */
-        fminterval = readl(base + OHCI_FMINTERVAL);
+        if (!no_fminterval)
+                fminterval = readl(base + OHCI_FMINTERVAL);
+
         writel(OHCI_HCR, base + OHCI_CMDSTATUS);
 
         /* reset requires max 10 us delay */
@@ -624,7 +634,9 @@ static void quirk_usb_handoff_ohci(struct pci_dev *pdev)
                         break;
                 udelay(1);
         }
-        writel(fminterval, base + OHCI_FMINTERVAL);
+
+        if (!no_fminterval)
+                writel(fminterval, base + OHCI_FMINTERVAL);
 
         /* Now the controller is safely in SUSPEND and nothing can wake it up */
         iounmap(base);