USB: Fix NEC OHCI chip silicon bug
This patch fixes a silicon bug in some NEC OHCI chips. The bug appears
at random times and is very, very difficult to reproduce. Without the
following patch, Linux would shut the chip and its associated devices
down. In Apple PowerBooks this leads to an unusable keyboard and mouse
(SSH still working). The idea of restarting the chip is taken from
public Darwin code.
Signed-off-by: Michael Hanselmann <linux-kernel@hansmi.ch>
Cc: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/usb/host/ohci-pci.c b/drivers/usb/host/ohci-pci.c
index 15013f4..a5e2eb8 100644
--- a/drivers/usb/host/ohci-pci.c
+++ b/drivers/usb/host/ohci-pci.c
@@ -111,6 +111,18 @@
#endif
}
+/* Check for NEC chip and apply quirk for allegedly lost interrupts.
+ */
+static int ohci_quirk_nec(struct usb_hcd *hcd)
+{
+ struct ohci_hcd *ohci = hcd_to_ohci (hcd);
+
+ ohci->flags |= OHCI_QUIRK_NEC;
+ ohci_dbg (ohci, "enabled NEC chipset lost interrupt quirk\n");
+
+ return 0;
+}
+
/* List of quirks for OHCI */
static const struct pci_device_id ohci_pci_quirks[] = {
{
@@ -134,6 +146,10 @@
.driver_data = (unsigned long)ohci_quirk_toshiba_scc,
},
{
+ PCI_DEVICE(PCI_VENDOR_ID_NEC, PCI_DEVICE_ID_NEC_USB),
+ .driver_data = (unsigned long)ohci_quirk_nec,
+ },
+ {
/* Toshiba portege 4000 */
.vendor = PCI_VENDOR_ID_AL,
.device = 0x5237,