linux-kernel - [ 066/104] USB: xhci - fix bit definitions for IMAN register

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Message-Id: <20130325010530.792145638@decadent.org.uk>
Date:	Mon, 25 Mar 2013 01:06:30 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	akpm@...ux-foundation.org, Dmitry Torokhov <dtor@...are.com>,
	Sarah Sharp <sarah.a.sharp@...ux.intel.com>
Subject: [ 066/104] USB: xhci - fix bit definitions for IMAN register

3.2-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Dmitry Torokhov <dtor@...are.com>

commit f8264340e694604863255cc0276491d17c402390 upstream.

According to XHCI specification (5.5.2.1) the IP is bit 0 and IE is bit 1
of IMAN register. Previously their definitions were reversed.

Even though there are no ill effects being observed from the swapped
definitions (because IMAN_IP is RW1C and in legacy PCI case we come in
with it already set to 1 so it was clearing itself even though we were
setting IMAN_IE instead of IMAN_IP), we should still correct the values.

This patch should be backported to kernels as old as 2.6.36, that
contain the commit 4e833c0b87a30798e67f06120cecebef6ee9644c "xhci: don't
re-enable IE constantly".

Signed-off-by: Dmitry Torokhov <dtor@...are.com>
Signed-off-by: Sarah Sharp <sarah.a.sharp@...ux.intel.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/usb/host/xhci.h |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/usb/host/xhci.h
+++ b/drivers/usb/host/xhci.h
@@ -206,8 +206,8 @@ struct xhci_op_regs {
 /* bits 12:31 are reserved (and should be preserved on writes). */

 /* IMAN - Interrupt Management Register */
-#define IMAN_IP		(1 << 1)
-#define IMAN_IE		(1 << 0)
+#define IMAN_IE		(1 << 1)
+#define IMAN_IP		(1 << 0)

 /* USBSTS - USB status - status bitmasks */
 /* HC not running - set to 1 when run/stop bit is cleared. */

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