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.h b/drivers/usb/host/ohci.h
index c2b5ecf..4ada43c 100644
--- a/drivers/usb/host/ohci.h
+++ b/drivers/usb/host/ohci.h
@@ -397,8 +397,10 @@
#define OHCI_QUIRK_BE_DESC 0x08 /* BE descriptors */
#define OHCI_QUIRK_BE_MMIO 0x10 /* BE registers */
#define OHCI_QUIRK_ZFMICRO 0x20 /* Compaq ZFMicro chipset*/
+#define OHCI_QUIRK_NEC 0x40 /* lost interrupts */
// there are also chip quirks/bugs in init logic
+ struct work_struct nec_work; /* Worker for NEC quirk */
};
/* convert between an hcd pointer and the corresponding ohci_hcd */