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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>
This commit is contained in:
Sebastian Andrzej Siewior 2013-08-20 18:35:49 +02:00 committed by Felipe Balbi
parent 9dfa36218d
commit 781f179830
2 changed files with 3 additions and 0 deletions
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1
arch/arm/boot/dts/am335x-evm.dts
View File

@ -192,6 +192,7 @@ usb@47401000 {
usb@47401800 {
status = "okay";
dr_mode = "host";
};
dma-controller@07402000 {

2
drivers/usb/musb/musb_dsps.c
View File

@ -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)) {