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authorMichael Hanselmann <linux-kernel@hansmi.ch>2007-06-01 01:34:27 +0400
committerGreg Kroah-Hartman <gregkh@suse.de>2007-07-13 03:34:29 +0400
commitd576bb9f2769b315a795f77f0c33322a976add7a (patch)
tree56d59afa4d1e96b519e81434bd09598f76bf1fee /drivers/usb/host/ohci-pci.c
parent020363384adfb02f26c1c038a127ed3da3d5cf37 (diff)
downloadlinux-d576bb9f2769b315a795f77f0c33322a976add7a.tar.xz
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>
Diffstat (limited to 'drivers/usb/host/ohci-pci.c')
-rw-r--r--drivers/usb/host/ohci-pci.c16
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/usb/host/ohci-pci.c b/drivers/usb/host/ohci-pci.c
index 15013f4519ad..a5e2eb85d073 100644
--- a/drivers/usb/host/ohci-pci.c
+++ b/drivers/usb/host/ohci-pci.c
@@ -111,6 +111,18 @@ static int ohci_quirk_toshiba_scc(struct usb_hcd *hcd)
#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 @@ static const struct pci_device_id ohci_pci_quirks[] = {
.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,