[PATCH 4.14 078/125] usb: dwc3: ep0: Fix ZLP for OUT ep0 requests

Greg Kroah-Hartman
2020-11-03T21:11:38Z

From: Thinh Nguyen <Thinh.Nguyen@synopsys.com>

commit 66706077dc89c66a4777a4c6298273816afb848c upstream.

The current ZLP handling for ep0 requests is only for control IN
requests. For OUT direction, DWC3 needs to check and setup for MPS
alignment.

Usually, control OUT requests can indicate its transfer size via the
wLength field of the control message. So usb_request->zero is usually
not needed for OUT direction. To handle ZLP OUT for control endpoint,
make sure the TRB is MPS size.

Cc: stable@vger.kernel.org
Fixes: c7fcdeb2627c ("usb: dwc3: ep0: simplify EP0 state machine")
Fixes: d6e5a549cc4d ("usb: dwc3: simplify ZLP handling")
Signed-off-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Signed-off-by: Felipe Balbi <balbi@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/usb/dwc3/ep0.c | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)

--- a/drivers/usb/dwc3/ep0.c
+++ b/drivers/usb/dwc3/ep0.c
@@ -967,12 +967,16 @@ static void dwc3_ep0_xfer_complete(struc
static void __dwc3_ep0_do_control_data(struct dwc3 *dwc,
struct dwc3_ep *dep, struct dwc3_request *req)
{
+ unsigned int trb_length = 0;
int ret;

req->direction = !!dep->number;

if (req->request.length == 0) {
- dwc3_ep0_prepare_one_trb(dep, dwc->ep0_trb_addr, 0,
+ if (!req->direction)
+ trb_length = dep->endpoint.maxpacket;
+
+ dwc3_ep0_prepare_one_trb(dep, dwc->bounce_addr, trb_length,
DWC3_TRBCTL_CONTROL_DATA, false);
ret = dwc3_ep0_start_trans(dep);
} else if (!IS_ALIGNED(req->request.length, dep->endpoint.maxpacket)
@@ -1024,9 +1028,12 @@ static void __dwc3_ep0_do_control_data(s

req->trb = &dwc->ep0_trb[dep->trb_enqueue - 1];

+ if (!req->direction)
+ trb_length = dep->endpoint.maxpacket;
+
/* Now prepare one extra TRB to align transfer size */
dwc3_ep0_prepare_one_trb(dep, dwc->bounce_addr,
- 0, DWC3_TRBCTL_CONTROL_DATA,
+ trb_length, DWC3_TRBCTL_CONTROL_DATA,
false);
ret = dwc3_ep0_start_trans(dep);
} else {