usb: dwc3: gadget: fix DEPSTARTCFG for non-EP0 EPs

DEPSTARTCFG for non-EP0 EPs must only be sent once per config

[ balbi@ti.com : changed config_start to start_config_issued ]
Signed-off-by: Paul Zimmerman <paulz@synopsys.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/usb/dwc3/core.h

@@ -529,6 +529,7 @@ static inline void dwc3_trb_to_nat(struct dwc3_trb_hw *hw, struct dwc3_trb *nat)
  * @ep0_status_pending: ep0 status response without a req is pending
  * @ep0_bounced: true when we used bounce buffer
  * @ep0_expect_in: true when we expect a DATA IN transfer
+ * @start_config_issued: true when StartConfig command has been issued
  * @ep0_next_event: hold the next expected event
  * @ep0state: state of endpoint zero
  * @link_state: link state
@@ -576,6 +577,7 @@ struct dwc3 {
 	unsigned		ep0_status_pending:1;
 	unsigned		ep0_bounced:1;
 	unsigned		ep0_expect_in:1;
+	unsigned		start_config_issued:1;
 
 	enum dwc3_ep0_next	ep0_next_event;
 	enum dwc3_ep0_state	ep0state;

drivers/usb/dwc3/ep0.c

@@ -455,6 +455,7 @@ static int dwc3_ep0_set_config(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl)
 	u32 cfg;
 	int ret;
 
+	dwc->start_config_issued = false;
 	cfg = le16_to_cpu(ctrl->wValue);
 
 	switch (dwc->dev_state) {

drivers/usb/dwc3/gadget.c

@@ -237,8 +237,12 @@ static int dwc3_gadget_start_config(struct dwc3 *dwc, struct dwc3_ep *dep)
 	if (dep->number != 1) {
 		cmd = DWC3_DEPCMD_DEPSTARTCFG;
 		/* XferRscIdx == 0 for ep0 and 2 for the remaining */
-		if (dep->number > 1)
+		if (dep->number > 1) {
+			if (dwc->start_config_issued)
+				return 0;
+			dwc->start_config_issued = true;
 			cmd |= DWC3_DEPCMD_PARAM(2);
+		}
 
 		return dwc3_send_gadget_ep_cmd(dwc, 0, cmd, &params);
 	}
@@ -1161,6 +1165,8 @@ static int dwc3_gadget_start(struct usb_gadget *g,
 	reg |= DWC3_DCFG_SUPERSPEED;
 	dwc3_writel(dwc->regs, DWC3_DCFG, reg);
 
+	dwc->start_config_issued = false;
+
 	/* Start with SuperSpeed Default */
 	dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512);
 
@@ -1592,6 +1598,7 @@ static void dwc3_gadget_disconnect_interrupt(struct dwc3 *dwc)
 
 	dwc3_stop_active_transfers(dwc);
 	dwc3_disconnect_gadget(dwc);
+	dwc->start_config_issued = false;
 
 	dwc->gadget.speed = USB_SPEED_UNKNOWN;
 }
@@ -1643,6 +1650,7 @@ static void dwc3_gadget_reset_interrupt(struct dwc3 *dwc)
 
 	dwc3_stop_active_transfers(dwc);
 	dwc3_clear_stall_all_ep(dwc);
+	dwc->start_config_issued = false;
 
 	/* Reset device address to zero */
 	reg = dwc3_readl(dwc->regs, DWC3_DCFG);