From 6010abf2c2c0e382d7e8ee44bd11f343aae90cce Mon Sep 17 00:00:00 2001
From: Bin Liu <b-liu@ti.com>
Date: Tue, 18 Dec 2018 07:58:04 -0600
Subject: [PATCH] usb: musb: dsps: fix otg state machine
Git-commit: 6010abf2c2c0e382d7e8ee44bd11f343aae90cce
Patch-mainline: v5.0-rc1
References: bsc#1051510

Due to lack of ID pin interrupt event on AM335x devices, the musb dsps
driver uses polling to detect usb device attach for dual-role port.

But in the case if a micro-A cable adapter is attached without a USB device
attached to the cable, the musb state machine gets stuck in a_wait_vrise
state waiting for the MUSB_CONNECT interrupt which won't happen due to the
usb device is not attached. The state is stuck in a_wait_vrise even after
the micro-A cable is detached, which could cause VBUS retention if then the
dual-role port is attached to a host port.

To fix the problem, make a_wait_vrise as a transient state, then move the
state to either a_wait_bcon for host port or a_idle state for dual-role
port, if no usb device is attached to the port.

Signed-off-by: Bin Liu <b-liu@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/usb/musb/musb_dsps.c |    9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

--- a/drivers/usb/musb/musb_dsps.c
+++ b/drivers/usb/musb/musb_dsps.c
@@ -242,8 +242,13 @@ static int dsps_check_status(struct musb
 
 	switch (musb->xceiv->otg->state) {
 	case OTG_STATE_A_WAIT_VRISE:
-		dsps_mod_timer_optional(glue);
-		break;
+		if (musb->port_mode == MUSB_HOST) {
+			musb->xceiv->otg->state = OTG_STATE_A_WAIT_BCON;
+			dsps_mod_timer_optional(glue);
+			break;
+		}
+		/* fall through */
+
 	case OTG_STATE_A_WAIT_BCON:
 		/* keep VBUS on for host-only mode */
 		if (musb->port_mode == MUSB_PORT_MODE_HOST) {