[PATCH] USB: fix EHCI BIOS handshake
Fix http://bugzilla.kernel.org/show_bug.cgi?id=6128
Finish morphing the "early handoff" version of the EHCI BIOS handshake over
to match the previous implementation inside the EHCI driver (except that
now we forcibly disable the SMI). The version that had been with the PCI
code was surprisingly full of bugs.
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Cc: <yazar256@gmail.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/usb/host/pci-quirks.c b/drivers/usb/host/pci-quirks.c
index 118288d..9e81c26 100644
--- a/drivers/usb/host/pci-quirks.c
+++ b/drivers/usb/host/pci-quirks.c
@@ -260,12 +260,13 @@
offset + EHCI_USBLEGCTLSTS,
val | EHCI_USBLEGCTLSTS_SOOE);
#endif
- }
- /* always say Linux will own the hardware
- * by setting EHCI_USBLEGSUP_OS.
- */
- pci_write_config_byte(pdev, offset + 3, 1);
+ /* some systems get upset if this semaphore is
+ * set for any other reason than forcing a BIOS
+ * handoff..
+ */
+ pci_write_config_byte(pdev, offset + 3, 1);
+ }
/* if boot firmware now owns EHCI, spin till
* it hands it over.