Patch "usb: musb: da8xx: fix babble condition handling" has been added to the 4.14-stable tree

This is a note to let you know that I've just added the patch titled

usb: musb: da8xx: fix babble condition handling

to the 4.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
usb-musb-da8xx-fix-babble-condition-handling.patch
and it can be found in the queue-4.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Bin Liu <[email protected]>
Date: Tue, 5 Dec 2017 08:45:30 -0600
Subject: usb: musb: da8xx: fix babble condition handling

From: Bin Liu <[email protected]>

commit bd3486ded7a0c313a6575343e6c2b21d14476645 upstream.

When babble condition happens, the musb controller might automatically turns off VBUS. On DA8xx platform, the controller generates drvvbus interrupt for turning off VBUS along with the babble interrupt.

In this case, we should handle the babble interrupt first and recover from the babble condition.

This change ignores the drvvbus interrupt if babble interrupt is also generated at the same time, so the babble recovery routine works properly.

---
 drivers/usb/musb/da8xx.c |   10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

@@ -305,7 +305,15 @@ static irqreturn_t da8xx_musb_interrupt(
 			musb->xceiv->otg->state = OTG_STATE_A_WAIT_VRISE;
 			portstate(musb->port1_status |= USB_PORT_STAT_POWER);
 			del_timer(&otg_workaround);
-		} else {
+		} else if (!(musb->int_usb & MUSB_INTR_BABBLE)){
+			/*
+			 * When babble condition happens, drvvbus interrupt
+			 * is also generated. Ignore this drvvbus interrupt
+			 * and let babble interrupt handler recovers the
+			 * controller; otherwise, the host-mode flag is lost
+			 * due to the MUSB_DEV_MODE() call below and babble
+			 * recovery logic will not called.
+			 */
 			musb->is_active = 0;
 			MUSB_DEV_MODE(musb);
 			otg->default_a = 0;

Patches currently in stable-queue which might be from [email protected] are

queue-4.14/usb-musb-da8xx-fix-babble-condition-handling.patch