Patch "usb: dwc3: gadget: Fix full speed mode" has been added to the 4.9-stable tree

Patch "usb: dwc3: gadget: Fix full speed mode" has been added to the 4.9-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    usb: dwc3: gadget: Fix full speed mode

to the 4.9-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     usb-dwc3-gadget-fix-full-speed-mode.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 9418ee15f718939aa7e650fd586d73765eb21f20 Mon Sep 17 00:00:00 2001
From: Roger Quadros <rogerq@ti.com>
Date: Tue, 3 Jan 2017 14:32:09 +0200
Subject: usb: dwc3: gadget: Fix full speed mode

From: Roger Quadros <rogerq@ti.com>

commit 9418ee15f718939aa7e650fd586d73765eb21f20 upstream.

DCFG.DEVSPD == 0x3 is not valid and we need to set
DCFG.DEVSPD to 0x1 for full speed mode. Same goes for
DSTS.CONNECTSPD.

Old databooks had 0x3 for full speed in 48MHz mode for
USB1.1 transceivers which was never supported. Newer databooks
don't mention 0x3 at all.

Cc: John Youn <John.Youn@synopsys.com>
Signed-off-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/usb/dwc3/core.h   |    6 ++----
 drivers/usb/dwc3/gadget.c |    5 ++---
 2 files changed, 4 insertions(+), 7 deletions(-)

--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h
@@ -301,9 +301,8 @@
 #define DWC3_DCFG_SUPERSPEED_PLUS (5 << 0)  /* DWC_usb31 only */
 #define DWC3_DCFG_SUPERSPEED	(4 << 0)
 #define DWC3_DCFG_HIGHSPEED	(0 << 0)
-#define DWC3_DCFG_FULLSPEED2	(1 << 0)
+#define DWC3_DCFG_FULLSPEED	(1 << 0)
 #define DWC3_DCFG_LOWSPEED	(2 << 0)
-#define DWC3_DCFG_FULLSPEED1	(3 << 0)
 
 #define DWC3_DCFG_NUMP_SHIFT	17
 #define DWC3_DCFG_NUMP(n)	(((n) >> DWC3_DCFG_NUMP_SHIFT) & 0x1f)
@@ -395,9 +394,8 @@
 #define DWC3_DSTS_SUPERSPEED_PLUS	(5 << 0) /* DWC_usb31 only */
 #define DWC3_DSTS_SUPERSPEED		(4 << 0)
 #define DWC3_DSTS_HIGHSPEED		(0 << 0)
-#define DWC3_DSTS_FULLSPEED2		(1 << 0)
+#define DWC3_DSTS_FULLSPEED		(1 << 0)
 #define DWC3_DSTS_LOWSPEED		(2 << 0)
-#define DWC3_DSTS_FULLSPEED1		(3 << 0)
 
 /* Device Generic Command Register */
 #define DWC3_DGCMD_SET_LMP		0x01
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -1606,7 +1606,7 @@ static int __dwc3_gadget_start(struct dw
 			reg |= DWC3_DCFG_LOWSPEED;
 			break;
 		case USB_SPEED_FULL:
-			reg |= DWC3_DCFG_FULLSPEED1;
+			reg |= DWC3_DCFG_FULLSPEED;
 			break;
 		case USB_SPEED_HIGH:
 			reg |= DWC3_DCFG_HIGHSPEED;
@@ -2465,8 +2465,7 @@ static void dwc3_gadget_conndone_interru
 		dwc->gadget.ep0->maxpacket = 64;
 		dwc->gadget.speed = USB_SPEED_HIGH;
 		break;
-	case DWC3_DSTS_FULLSPEED2:
-	case DWC3_DSTS_FULLSPEED1:
+	case DWC3_DSTS_FULLSPEED:
 		dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(64);
 		dwc->gadget.ep0->maxpacket = 64;
 		dwc->gadget.speed = USB_SPEED_FULL;


Patches currently in stable-queue which might be from rogerq@ti.com are

queue-4.9/usb-dwc3-gadget-fix-full-speed-mode.patch