Commit 6ada8346 authored by John Youn's avatar John Youn Committed by Luis Henriques

usb: dwc3: Reset the transfer resource index on SET_INTERFACE

commit aebda618 upstream.

This fixes an issue introduced in commit b23c8439 (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 76e838c9 (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: default avatarHuang Rui <ray.huang@amd.com>
Tested-by: default avatarSubbaraya Sundeep Bhatta <subbaraya.sundeep.bhatta@xilinx.com>
Fixes: b23c8439 (usb: dwc3: gadget: fix DEPSTARTCFG for non-EP0 EPs)
Signed-off-by: default avatarJohn Youn <johnyoun@synopsys.com>
Signed-off-by: default avatarFelipe Balbi <balbi@ti.com>
[ luis: backported to 3.16:
  - replaced dwc3_trace() by dev_vdbg() ]
Signed-off-by: default avatarLuis Henriques <luis.henriques@canonical.com>
parent 70b1daf0
......@@ -707,6 +707,10 @@ static int dwc3_ep0_std_request(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl)
dev_vdbg(dwc->dev, "USB_REQ_SET_ISOCH_DELAY\n");
ret = dwc3_ep0_set_isoch_delay(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);
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment