On Fri, Aug 07, 2009 at 10:17:12PM +0200, Balbi Felipe (Nokia-D/Helsinki) wrote:
> On Fri, Aug 07, 2009 at 09:22:33PM +0200, ext Peter Barada wrote:
> > Someting strange is going on. If I boot with the MUSB->OTG adapter ->
> > thumbdrive plugged in, and then modprobe the driver, it finds the
> > thumbdrive. I can then remove/reinsert the OTG adapter -> thumbdrive
> > multiple times, and each time it is enumerated.
> >
> > If I boot w/o the OTG adapter -> thumbdrive plugged in, modprobe the
> > musb driver, and then plug in the OTG adaptor ->thumbdrive, it is not
> > enumerated.
> >
> > Any idea why I need the OTG adapter -> thumbdrive plugged in at kernel
> > boot for it to enumerate the thumbdrive?
>
> which board are you using ?
ok, got you. it's 35xx-based with twl4030.
when you plug the micro-a cable, see on drivers/usb/otg/twl4030-usb.c
what happens. You should have a print about the link status, see if that
is ID.
Then try something like this patch:
diff --git a/drivers/usb/otg/twl4030-usb.c b/drivers/usb/otg/twl4030-usb.c
index 9e3e7a5..4bc5b7f 100644
--- a/drivers/usb/otg/twl4030-usb.c
+++ b/drivers/usb/otg/twl4030-usb.c
@@ -246,6 +246,8 @@ enum linkstat {
};
struct twl4030_usb {
+ /* used for driving or not vbus */
+ struct work_struct work;
struct otg_transceiver otg;
struct device *dev;
@@ -347,6 +349,18 @@ twl4030_usb_clear_bits(struct twl4030_usb *twl, u8 reg, u8 bits)
/*-------------------------------------------------------------------------*/
+static void twl4030_vbus_work(struct work_struct *work)
+{
+ struct twl4030_usb *twl = container_of(work, twl4030_usb, work);
+
+ if (twl->driver_vbus)
+ (void) twl4030_usb_set_bits(twl, TWL4030_OTG_CTRL,
+ TWL4030_OTG_DRVVBUS);
+ else
+ (void) twl4030_usb_set_bits(twl, TWL4030_OTG_CTRL,
+ TWL4030_OTG_DRVVBUS);
+}
+
static enum linkstat twl4030_usb_linkstat(struct twl4030_usb *twl)
{
int status;
@@ -386,12 +400,16 @@ static enum linkstat twl4030_usb_linkstat(struct twl4030_usb *twl)
if (linkstat == USB_LINK_ID) {
twl->otg.default_a = true;
twl->otg.state = OTG_STATE_A_IDLE;
+ twl->drive_vbus = true;
} else {
twl->otg.default_a = false;
twl->otg.state = OTG_STATE_B_IDLE;
+ twl->driver_vbus = false;
}
spin_unlock_irq(&twl->lock);
+ schedule_work(&twl->vbus_work);
+
return linkstat;
}
@@ -668,6 +686,8 @@ static int __devinit twl4030_usb_probe(struct platform_device *pdev)
if (!twl)
return -ENOMEM;
+ INIT_WORK(&twl->work, twl4030_vbus_work);
+
twl->dev = &pdev->dev;
twl->irq = platform_get_irq(pdev, 0);
twl->otg.dev = twl->dev;
--
balbi
--
To unsubscribe from this list: send the line "unsubscribe linux-omap" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
