New patch to review for coreboot: libpayload: udc/dwc2: Ignore setup packet in check for queue empty during shutdown

[Patrick Georgi]

Patrick Georgi ([e-mail]) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/12413

-gerrit

commit cdf7573a7fdf77afe6dd696cc6cc9c113a8f16e2
Author: Furquan Shaikh 
Date:   Fri Nov 6 22:22:56 2015 -0800

libpayload: udc/dwc2: Ignore setup packet in check for queue empty
    during shutdown

DWC2 UDC controller always requires an active packet to be present in
    EP0-OUT to ensure proper operation of control plane. Thus, during
    shutdown ignore EP0-OUT for queue empty check if only 1 packet is
    present.

BUG=b:24676003
    BRANCH=None
    TEST=Compiles successfully. "fastboot reboot-bootloader" reboots
    device without timeout in udc shutdown.

Change-Id: Iafe46c80f58c4cd57f8d58f060d805b603506bbd
    Signed-off-by: Patrick Georgi 
    Original-Commit-Id: 4e7c27d849c0411aae58e60a24d8170a27ab8485
    Original-Change-Id: Ifa493ce0e41964ee7ca8bb3a1f4bb8726fa11173
    Original-Signed-off-by: Furquan Shaikh 
    Original-Reviewed-on: https://chromium-review.googlesource.com/311257
    Original-Commit-Ready: Furquan Shaikh 
    Original-Tested-by: Furquan Shaikh 
    Original-Reviewed-by: Aaron Durbin 
---
 payloads/libpayload/drivers/udc/dwc2.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/payloads/libpayload/drivers/udc/dwc2.c b/payloads/libpayload/drivers/udc/dwc2.c
index dc9eb7c..cde3a76 100644
--- a/payloads/libpayload/drivers/udc/dwc2.c
+++ b/payloads/libpayload/drivers/udc/dwc2.c
@@ -704,9 +704,21 @@ static void dwc2_shutdown(struct usbdev_ctrl *this)
    	is_empty = 1;
    	this->poll(this);
    	for (i = 0; i < 16; i++)
-			for (j = 0; j < 2; j++)
+			for (j = 0; j < 2; j++) {
+				/*
+				 * EP0-OUT needs to always have an active packet
+				 * for proper operation of control packet
+				 * flow. Thus, ignore if only 1 packet is
+				 * present in EP0-OUT.
+				 */
+				if ((i == 0) && (j == 0) &&
+				    SIMPLEQ_SINGLETON(&p->eps[0][0].job_queue,
+						      queue))
+					continue;
+
    			if (!SIMPLEQ_EMPTY(&p->eps[i][j].job_queue))
    				is_empty = 0;
+			}
    }

if (timer_us(shutdown_timer_us) >= shutdown_timeout_us)