[PATCH v3 1/5] usb: chipidea: udc: fix setup of endpoint maxpacket size

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From: Michael Grzeschik <m.grzeschik@xxxxxxxxxxxxxx>

This patch changes the setup of the endpoint maxpacket size. All non control
endpoints are initialized with an undefined ((unsigned short)~0) maxpacket
size. The maxpacket size of Endpoint 0 will be kept at CTRL_PAYLOAD_MAX.

Some gadget drivers check for the maxpacket size before they enable the
endpoint, which leads to a wrong state in these drivers.

Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Michael Grzeschik <m.grzeschik@xxxxxxxxxxxxxx>
Signed-off-by: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx>
Acked-by: Felipe Balbi <balbi@xxxxxx>
---
changes since v1:
- reworded patch description
- Added Felipe's Ack

 drivers/usb/chipidea/udc.c |    8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/chipidea/udc.c b/drivers/usb/chipidea/udc.c
index c7a032a..7801a3f 100644
--- a/drivers/usb/chipidea/udc.c
+++ b/drivers/usb/chipidea/udc.c
@@ -1455,7 +1455,12 @@ static int init_eps(struct ci13xxx *ci)
 
 			mEp->ep.name      = mEp->name;
 			mEp->ep.ops       = &usb_ep_ops;
-			mEp->ep.maxpacket = CTRL_PAYLOAD_MAX;
+			/*
+			 * for ep0: maxP defined in desc, for other
+			 * eps, maxP is set by epautoconfig() called
+			 * by gadget layer
+			 */
+			mEp->ep.maxpacket = (unsigned short)~0;
 
 			INIT_LIST_HEAD(&mEp->qh.queue);
 			mEp->qh.ptr = dma_pool_alloc(ci->qh_pool, GFP_KERNEL,
@@ -1475,6 +1480,7 @@ static int init_eps(struct ci13xxx *ci)
 				else
 					ci->ep0in = mEp;
 
+				mEp->ep.maxpacket = CTRL_PAYLOAD_MAX;
 				continue;
 			}
 
-- 
1.7.10.4

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