From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Tue, 20 Aug 2013 16:35:49 +0000 (+0200)
Subject: usb: musb: am335x-evm: Do not remove the session bit HOST-only mode
X-Git-Tag: firefly_0821_release~176^2~5474^2~19^2~9
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=781f17983015dae33324e34d1bb831e715fa04d4;p=firefly-linux-kernel-4.4.55.git

usb: musb: am335x-evm: Do not remove the session bit HOST-only mode

This is what I observe:
On the first connect, the musb starts with DEVCTL.Session set. On
disconnect, musb_core calls try_idle. That functions removes the Session
bit signalizing that the session is over (something that only in OTG is
required). A new device, that is plugged, is no longer recognized.
I've setup a timer and checked the DEVCTL register and I haven't seen a
change in VBus and I saw the B-Device bit set. After setting the IDDIG
into A mode and forcing the device to behave like a A device, I didn't
see a change.
Neither VBUS goes to 0b11 nor does a session start request comes.
In the TI-v3.2 kernel they skip to call musb_platform_try_idle() in the
OTG_STATE_A_WAIT_BCON state while not in OTG mode.
Since the second port hast a standard A plug the patch changes the port
to run in host mode only and skips the timer which would remove
DEVCTL.Session so we can reconnect to another device later.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Felipe Balbi <balbi@ti.com>
---

diff --git a/arch/arm/boot/dts/am335x-evm.dts b/arch/arm/boot/dts/am335x-evm.dts
index 648a67e74d1b..e8ec8756e498 100644
--- a/arch/arm/boot/dts/am335x-evm.dts
+++ b/arch/arm/boot/dts/am335x-evm.dts
@@ -192,6 +192,7 @@
 
 			usb@47401800 {
 				status = "okay";
+				dr_mode = "host";
 			};
 
 			dma-controller@07402000  {
diff --git a/drivers/usb/musb/musb_dsps.c b/drivers/usb/musb/musb_dsps.c
index 392406da3751..4047cbb91bac 100644
--- a/drivers/usb/musb/musb_dsps.c
+++ b/drivers/usb/musb/musb_dsps.c
@@ -231,6 +231,8 @@ static void dsps_musb_try_idle(struct musb *musb, unsigned long timeout)
 		glue->last_timer = jiffies;
 		return;
 	}
+	if (musb->port_mode == MUSB_PORT_MODE_HOST)
+		return;
 
 	if (time_after(glue->last_timer, timeout) &&
 				timer_pending(&glue->timer)) {