linux-kernel - [PATCH v2] usb: dwc3: gadget: Fix full speed mode

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Date:   Tue, 3 Jan 2017 14:32:09 +0200
From:   Roger Quadros <rogerq@...com>
To:     <balbi@...nel.org>
CC:     <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Roger Quadros <rogerq@...com>,
        John Youn <John.Youn@...opsys.com>
Subject: [PATCH v2] usb: dwc3: gadget: Fix full speed mode

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@...opsys.com>
Signed-off-by: Roger Quadros <rogerq@...com>
---
 drivers/usb/dwc3/core.h   | 6 ++----
 drivers/usb/dwc3/gadget.c | 5 ++---
 2 files changed, 4 insertions(+), 7 deletions(-)

diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
index de5a857..389dd6d 100644
--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h
@@ -311,9 +311,8 @@
 #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)
@@ -405,9 +404,8 @@
 #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
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index efddaf5..afec1f8 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -1720,7 +1720,7 @@ static int __dwc3_gadget_start(struct dwc3 *dwc)
 			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;
@@ -2531,8 +2531,7 @@ static void dwc3_gadget_conndone_interrupt(struct dwc3 *dwc)
 		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;
-- 
2.7.4