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")
Cc: stable@xxxxxxxxxxxxxxx #v4.9
Reported-by: Moreno Bartalucci <moreno.bartalucci@xxxxxxxxxxxx>
Acked-by: Tony Lindgren <tony@xxxxxxxxxxx>
Signed-off-by: Bin Liu <b-liu@xxxxxx>
---
backport for stable v4.9 only.
drivers/usb/musb/musb_dsps.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/drivers/usb/musb/musb_dsps.c b/drivers/usb/musb/musb_dsps.c
index 9f125e179acd..39666fb911b0 100644
--- 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 *musb, void *unused)
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 */
--
1.9.1
--
To unsubscribe from this list: send the line "unsubscribe linux-usb" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
