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@xxxxxxxxxxxxx>
---
arch/arm/boot/dts/am335x-evm.dts | 3 +++
drivers/usb/musb/musb_dsps.c | 2 ++
2 files changed, 5 insertions(+)
diff --git a/arch/arm/boot/dts/am335x-evm.dts b/arch/arm/boot/dts/am335x-evm.dts
index 648a67e..794b38b9 100644
--- a/arch/arm/boot/dts/am335x-evm.dts
+++ b/arch/arm/boot/dts/am335x-evm.dts
@@ -192,6 +192,9 @@
usb@47401800 {
status = "okay";
+ musb1: usb@47401c00 {
+ port-mode = <1>;
+ };
};
dma-controller@07402000 {
diff --git a/drivers/usb/musb/musb_dsps.c b/drivers/usb/musb/musb_dsps.c
index 7368577..b7b2346 100644
--- a/drivers/usb/musb/musb_dsps.c
+++ b/drivers/usb/musb/musb_dsps.c
@@ -230,6 +230,8 @@ 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)) {
--
1.8.4.rc2
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