linux-kernel - [PATCH v4 4/9] usb: dwc3: gadget: Continue handling EP0 xfercomplete events

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Date:   Wed, 17 Aug 2022 11:23:54 -0700
From:   Wesley Cheng <quic_wcheng@...cinc.com>
To:     <balbi@...nel.org>, <gregkh@...uxfoundation.org>,
        <Thinh.Nguyen@...opsys.com>
CC:     <linux-kernel@...r.kernel.org>, <linux-usb@...r.kernel.org>,
        <quic_jackp@...cinc.com>, Wesley Cheng <quic_wcheng@...cinc.com>
Subject: [PATCH v4 4/9] usb: dwc3: gadget: Continue handling EP0 xfercomplete events

During soft disconnect, EP0 events are expected to be handled in order to
allow the controller to successfully move into the halted state.  Since
__dwc3_gadget_stop() is executed before polling, EP0 has been disabled, and
events are being blocked.  Allow xfercomplete events to be handled, so that
cached SETUP packets can be read out from the internal controller memory.

Without doing so, it will lead to endxfer timeouts, which results to
controller halt failures.

Reviewed-by: Thinh Nguyen <Thinh.Nguyen@...opsys.com>
Signed-off-by: Wesley Cheng <quic_wcheng@...cinc.com>
---
 drivers/usb/dwc3/gadget.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 3b83e3c4b932..aff288b7baeb 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -2721,6 +2721,7 @@ static int __dwc3_gadget_start(struct dwc3 *dwc)
 	dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512);
 
 	dep = dwc->eps[0];
+	dep->flags = 0;
 	ret = __dwc3_gadget_ep_enable(dep, DWC3_DEPCFG_ACTION_INIT);
 	if (ret) {
 		dev_err(dwc->dev, "failed to enable %s\n", dep->name);
@@ -2728,6 +2729,7 @@ static int __dwc3_gadget_start(struct dwc3 *dwc)
 	}
 
 	dep = dwc->eps[1];
+	dep->flags = 0;
 	ret = __dwc3_gadget_ep_enable(dep, DWC3_DEPCFG_ACTION_INIT);
 	if (ret) {
 		dev_err(dwc->dev, "failed to enable %s\n", dep->name);
@@ -3599,11 +3601,12 @@ static void dwc3_endpoint_interrupt(struct dwc3 *dwc,
 	dep = dwc->eps[epnum];
 
 	if (!(dep->flags & DWC3_EP_ENABLED)) {
-		if (!(dep->flags & DWC3_EP_TRANSFER_STARTED))
+		if ((epnum > 1) && !(dep->flags & DWC3_EP_TRANSFER_STARTED))
 			return;
 
 		/* Handle only EPCMDCMPLT when EP disabled */
-		if (event->endpoint_event != DWC3_DEPEVT_EPCMDCMPLT)
+		if ((event->endpoint_event != DWC3_DEPEVT_EPCMDCMPLT) &&
+			!(epnum <= 1 && event->endpoint_event == DWC3_DEPEVT_XFERCOMPLETE))
 			return;
 	}