Patch "usb: musb: dsps: keep VBUS on for host-only mode" has been added to the 4.9-stable tree

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

usb: musb: dsps: keep VBUS on for host-only mode

to the 4.9-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-dsps-keep-vbus-on-for-host-only-mode.patch
and it can be found in the queue-4.9 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: Thu, 25 May 2017 13:42:39 -0500
Subject: usb: musb: dsps: keep VBUS on for host-only mode

From: Bin Liu <[email protected]>

commit b3addcf0d1f04f53fcc302577d5a5e964c18531a upstream.

Currently VBUS is turned off while a usb device is detached, and turned on again by the polling routine. This short period VBUS loss prevents usb modem to switch mode.

VBUS should be constantly on for host-only mode, so this changes the driver to not turn off VBUS for host-only mode.

---
 drivers/usb/musb/musb_dsps.c |    6 ++++++
 1 file changed, 6 insertions(+)

@@ -213,6 +213,12 @@ static int dsps_check_status(struct musb
 				msecs_to_jiffies(wrp->poll_timeout));
 		break;
 	case OTG_STATE_A_WAIT_BCON:
+		/* keep VBUS on for host-only mode */
+		if (musb->port_mode == MUSB_PORT_MODE_HOST) {
+			mod_timer(&glue->timer, jiffies +
+					msecs_to_jiffies(wrp->poll_timeout));
+			break;
+		}
 		musb_writeb(musb->mregs, MUSB_DEVCTL, 0);
 		skip_session = 1;
 		/* fall */

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

queue-4.9/usb-musb-dsps-keep-vbus-on-for-host-only-mode.patch