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 signalize 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 I didn't see a change.
Neither VBUS goes to 0b11 nor does a session start request come.
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, force the id-pin to host only and skip the
timer which would remove DEVCTL.Session.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
---
arch/arm/boot/dts/am335x-evm.dts | 3 +++
drivers/usb/musb/musb_dsps.c | 13 +++++++++++++
2 files changed, 16 insertions(+)
diff --git a/arch/arm/boot/dts/am335x-evm.dts b/arch/arm/boot/dts/am335x-evm.dts
index c26c16c..38a821a 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@07402000 {
diff --git a/drivers/usb/musb/musb_dsps.c b/drivers/usb/musb/musb_dsps.c
index 4ffbaac..b0752fa 100644
--- a/drivers/usb/musb/musb_dsps.c
+++ b/drivers/usb/musb/musb_dsps.c
@@ -65,6 +65,9 @@ static inline void dsps_writeb(void __iomem *addr, unsigned offset, u8 data)
static inline void dsps_writel(void __iomem *addr, unsigned offset, u32 data)
{ __raw_writel(data, addr + offset); }
+#define USBMODE_IDDIG_A (0 << 8)
+#define USBMODE_ID_MUX_REG (1 << 7)
+#define USBMODE_ID_MUX_PHY (0 << 7)
/**
* DSPS musb wrapper register offset.
* FIXME: This should be expanded to have all the wrapper registers from TI DSPS
@@ -230,6 +233,8 @@ 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)) {
@@ -388,6 +393,14 @@ static int dsps_musb_init(struct musb *musb)
val &= ~(1 << wrp->otg_disable);
dsps_writel(musb->ctrl_base, wrp->phy_utmi, val);
+ if (musb->port_mode == MUSB_PORT_MODE_HOST) {
+ val = USBMODE_IDDIG_A;
+ val |= USBMODE_ID_MUX_REG;
+ } else {
+ val = USBMODE_ID_MUX_PHY;
+ }
+ dsps_writel(musb->ctrl_base, wrp->mode, val);
+
return 0;
}
--
1.8.3.2
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