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 <stable@xxxxxxxxxxxxxxx> know about it.
>From b3addcf0d1f04f53fcc302577d5a5e964c18531a Mon Sep 17 00:00:00 2001
From: Bin Liu <b-liu@xxxxxx>
Date: Thu, 25 May 2017 13:42:39 -0500
Subject: usb: musb: dsps: keep VBUS on for host-only mode
From: Bin Liu <b-liu@xxxxxx>
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.
Fixes: 2f3fd2c5bde1 ("usb: musb: Prepare dsps glue layer for PM runtime support")
Reported-by: Moreno Bartalucci <moreno.bartalucci@xxxxxxxxxxxx>
Acked-by: Tony Lindgren <tony@xxxxxxxxxxx>
Signed-off-by: Bin Liu <b-liu@xxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/musb/musb_dsps.c | 6 ++++++
1 file changed, 6 insertions(+)
--- a/drivers/usb/musb/musb_dsps.c
+++ b/drivers/usb/musb/musb_dsps.c
@@ -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 b-liu@xxxxxx are
queue-4.9/usb-musb-dsps-keep-vbus-on-for-host-only-mode.patch