ChangeSet 1.2000.12.5, 2004/10/21 13:29:07-07:00, [EMAIL PROTECTED]
[PATCH] USB: ohci module param for broken bios
This patch provides a way to work around especially broken BIOS/SMM
implementations which claim they support the OS-handoff handshake
but actually don't. It's confirmed that this resolves some OSDL bug
(ID isn't handy just now).
Signed-off-by: David Brownell <[EMAIL PROTECTED]>
Signed-off-by: Greg Kroah-Hartman <[EMAIL PROTECTED]>
drivers/usb/host/ohci-hcd.c | 7 ++++++-
1 files changed, 6 insertions(+), 1 deletion(-)
diff -Nru a/drivers/usb/host/ohci-hcd.c b/drivers/usb/host/ohci-hcd.c
--- a/drivers/usb/host/ohci-hcd.c 2004-10-22 16:12:51 -07:00
+++ b/drivers/usb/host/ohci-hcd.c 2004-10-22 16:12:51 -07:00
@@ -154,6 +154,11 @@
module_param (power_switching, bool, 0);
MODULE_PARM_DESC (power_switching, "true (not default) to switch port power");
+/* Some boards leave IR set wrongly, since they fail BIOS/SMM handshakes */
+static int no_handshake = 0;
+module_param (no_handshake, bool, 0);
+MODULE_PARM_DESC (no_handshake, "true (not default) disables BIOS handshake");
+
/*-------------------------------------------------------------------------*/
/*
@@ -426,7 +431,7 @@
#ifndef IR_DISABLE
/* SMM owns the HC? not for long! */
- if (ohci_readl (&ohci->regs->control) & OHCI_CTRL_IR) {
+ if (!no_handshake && ohci_readl (&ohci->regs->control) & OHCI_CTRL_IR) {
ohci_dbg (ohci, "USB HC TakeOver from BIOS/SMM\n");
/* this timeout is arbitrary. we make it long, so systems
-------------------------------------------------------
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