linux-kernel - [PATCH 3.8 005/116] usb: dwc3: gadget: clear stall when disabling endpoint

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Message-Id: <1406067727-19683-6-git-send-email-kamal@canonical.com>
Date:	Tue, 22 Jul 2014 15:20:16 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Felipe Balbi <balbi@...com>, Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.8 005/116] usb: dwc3: gadget: clear stall when disabling endpoint

3.8.13.27 -stable review patch.  If anyone has any objections, please let me know.

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

From: Felipe Balbi <balbi@...com>

commit 687ef9817df7ed960d14575b9033dde3d04631fe upstream.

so it seems like DWC3 IP doesn't clear stalls
automatically when we disable an endpoint, because
of that, we _must_ make sure stalls are cleared
before clearing the proper bit in DALEPENA register.

Reported-by: Johannes Stezenbach <js@...21.net>
Signed-off-by: Felipe Balbi <balbi@...com>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 drivers/usb/dwc3/gadget.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 418288e..288ec5e 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -603,6 +603,10 @@ static int __dwc3_gadget_ep_disable(struct dwc3_ep *dep)
 
 	dwc3_remove_requests(dwc, dep);
 
+	/* make sure HW endpoint isn't stalled */
+	if (dep->flags & DWC3_EP_STALL)
+		__dwc3_gadget_ep_set_halt(dep, 0);
+
 	reg = dwc3_readl(dwc->regs, DWC3_DALEPENA);
 	reg &= ~DWC3_DALEPENA_EP(dep->number);
 	dwc3_writel(dwc->regs, DWC3_DALEPENA, reg);
-- 
1.9.1

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