commit 8cd42e97bf451bbbb2f54dc571366ae5a72faaea
Author: Kumar Gala <galak@gate.crashing.org>
Date:   Fri Jan 20 13:57:52 2006 -0800

    [PATCH] USB: EHCI and Freescale 83xx quirk
    
    On the MPC834x processors the multiport host (MPH) EHCI controller has an
    erratum in which the port number in the queue head expects to be 0..N-1
    instead of 1..N.  If we are on one of these chips we subtract one from
    the port number before putting it into the queue head.
    
    Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
    Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
    Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/usb/host/ehci-fsl.c b/drivers/usb/host/ehci-fsl.c
index c6012d6..59f90f7 100644
--- a/drivers/usb/host/ehci-fsl.c
+++ b/drivers/usb/host/ehci-fsl.c
@@ -198,6 +198,16 @@ static void mpc83xx_usb_setup(struct usb
 		mpc83xx_setup_phy(ehci, pdata->phy_mode, 0);
 
 	if (pdata->operating_mode == FSL_USB2_MPH_HOST) {
+		unsigned int chip, rev, svr;
+
+		svr = mfspr(SPRN_SVR);
+		chip = svr >> 16;
+		rev = (svr >> 4) & 0xf;
+
+		/* Deal with USB Erratum #14 on MPC834x Rev 1.0 & 1.1 chips */
+		if ((rev == 1) && (chip >= 0x8050) && (chip <= 0x8055))
+			ehci->has_fsl_port_bug = 1;
+
 		if (pdata->port_enables & FSL_USB2_PORT0_ENABLED)
 			mpc83xx_setup_phy(ehci, pdata->phy_mode, 0);
 		if (pdata->port_enables & FSL_USB2_PORT1_ENABLED)
diff --git a/drivers/usb/host/ehci-q.c b/drivers/usb/host/ehci-q.c
index 9b13bf2..6e28e59 100644
--- a/drivers/usb/host/ehci-q.c
+++ b/drivers/usb/host/ehci-q.c
@@ -721,7 +721,14 @@ qh_make (
 		info1 |= maxp << 16;
 
 		info2 |= (EHCI_TUNE_MULT_TT << 30);
-		info2 |= urb->dev->ttport << 23;
+
+		/* Some Freescale processors have an erratum in which the
+		 * port number in the queue head was 0..N-1 instead of 1..N.
+		 */
+		if (ehci_has_fsl_portno_bug(ehci))
+			info2 |= (urb->dev->ttport-1) << 23;
+		else
+			info2 |= urb->dev->ttport << 23;
 
 		/* set the address of the TT; for TDI's integrated
 		 * root hub tt, leave it zeroed.
diff --git a/drivers/usb/host/ehci.h b/drivers/usb/host/ehci.h
index 86af41c..679c1cd 100644
--- a/drivers/usb/host/ehci.h
+++ b/drivers/usb/host/ehci.h
@@ -88,8 +88,11 @@ #define	DEFAULT_I_TDPS		1024		/* some HC
 	unsigned long		next_statechange;
 	u32			command;
 
+	/* SILICON QUIRKS */
 	unsigned		is_tdi_rh_tt:1;	/* TDI roothub with TT */
 	unsigned		no_selective_suspend:1;
+	unsigned		has_fsl_port_bug:1; /* FreeScale */
+
 	u8			sbrn;		/* packed release number */
 
 	/* irq statistics */
@@ -639,6 +642,18 @@ #endif
 
 /*-------------------------------------------------------------------------*/
 
+#ifdef CONFIG_PPC_83xx
+/* Some Freescale processors have an erratum in which the TT
+ * port number in the queue head was 0..N-1 instead of 1..N.
+ */
+#define	ehci_has_fsl_portno_bug(e)		((e)->has_fsl_port_bug)
+#else
+#define	ehci_has_fsl_portno_bug(e)		(0)
+#endif
+
+
+/*-------------------------------------------------------------------------*/
+
 #ifndef DEBUG
 #define STUB_DEBUG_FILES
 #endif	/* DEBUG */