[PATCH 3.2 094/110] usb: dwc3: Reset the transfer resource index on SET_INTERFACE

[Ben Hutchings]

3.2.71-rc1 review patch.  If anyone has any objections, please let me know.

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

From: John Youn <John.Youn@xxxxxxxxxxxx>

commit aebda618718157a69c0dc0adb978d69bc2b8723c upstream.

This fixes an issue introduced in commit b23c843992b6 (usb: dwc3:
gadget: fix DEPSTARTCFG for non-EP0 EPs) that made sure we would
only use DEPSTARTCFG once per SetConfig.

The trick is that we should use one DEPSTARTCFG per SetConfig *OR*
SetInterface. SetInterface was completely missed from the original
patch.

This problem became aparent after commit 76e838c9f776 (usb: dwc3:
gadget: return error if command sent to DEPCMD register fails)
added checking of the return status of device endpoint commands.

'Set Endpoint Transfer Resource' command was caught failing
occasionally. This is because the Transfer Resource
Index was not getting reset during a SET_INTERFACE request.

Finally, to fix the issue, was we have to do is make sure that
our start_config_issued flag gets reset whenever we receive a
SetInterface request.

To verify the problem (and its fix), all we have to do is run
test 9 from testusb with 'testusb -t 9 -s 2048 -a -c 5000'.

Tested-by: Huang Rui <ray.huang@xxxxxxx>
Tested-by: Subbaraya Sundeep Bhatta <subbaraya.sundeep.bhatta@xxxxxxxxxx>
Fixes: b23c843992b6 (usb: dwc3: gadget: fix DEPSTARTCFG for non-EP0 EPs)
Signed-off-by: John Youn <johnyoun@xxxxxxxxxxxx>
Signed-off-by: Felipe Balbi <balbi@xxxxxx>
[bwh: Backported to 3.2: use dev_vdbg() instead of dwc3_trace()]
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
 drivers/usb/dwc3/ep0.c | 4 ++++
 1 file changed, 4 insertions(+)

--- a/drivers/usb/dwc3/ep0.c
+++ b/drivers/usb/dwc3/ep0.c
@@ -498,6 +498,10 @@ static int dwc3_ep0_std_request(struct d
 		dev_vdbg(dwc->dev, "USB_REQ_SET_CONFIGURATION\n");
 		ret = dwc3_ep0_set_config(dwc, ctrl);
 		break;
+	case USB_REQ_SET_INTERFACE:
+		dev_vdbg(dwc->dev ,"USB_REQ_SET_INTERFACE");
+		dwc->start_config_issued = false;
+		/* Fall through */
 	default:
 		dev_vdbg(dwc->dev, "Forwarding to gadget driver\n");
 		ret = dwc3_ep0_delegate_req(dwc, ctrl);

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