Re: musb OTG broken in 2.6.29-rc3?

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On Tue, Feb 10, 2009 at 05:47:16AM +0100, Ajay Kumar Gupta wrote:
> > -----Original Message-----
> > From: Steve Sakoman [mailto:sakoman@xxxxxxxxx]
> > Sent: Tuesday, February 10, 2009 10:13 AM
> > To: Gupta, Ajay Kumar
> > Cc: linux-omap
> > Subject: Re: musb OTG broken in 2.6.29-rc3?
> >
> > On Mon, Feb 9, 2009 at 8:05 PM, Gupta, Ajay Kumar <ajay.gupta@xxxxxx> wrote:
> >
> > >> Before I spend too much time debugging, has anyone else been
> > >> successful with musb OTG in 2.6.29-rc3?  A quick search of this list
> > >> didn't turn up any discussion of issues.
> > >
> > > It works fine on OMAP35x EVM too. I had to add a proc entry for session start
> > > (Switching on the vBus).
> >
> > Could you give me a little more detail on what you had to do for
> > session start?  Perhaps I have a similar issue on Overo.
> It is same $ echo "F" >/proc/driver/musb_hdrc, which was earlier
> In musb_procfs.c and now been removed.
> 
> +       case 'F':
> +               reg = musb_readb(mbase, MUSB_DEVCTL);
> +               reg |= MUSB_DEVCTL_SESSION;
> +               musb_writeb(mbase, MUSB_DEVCTL, reg);

a temp sysfs for that will help:

Steve, could you try the following

==== cut here ====

diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c
index 2cc34fa..0ffd611 100644
--- a/drivers/usb/musb/musb_core.c
+++ b/drivers/usb/musb/musb_core.c
@@ -1713,6 +1713,32 @@ musb_vbus_show(struct device *dev, struct device_attribute *attr, char *buf)
 }
 static DEVICE_ATTR(vbus, 0644, musb_vbus_show, musb_vbus_store);
 
+static ssize_t
+musb_session_store(struct device *dev, struct device_attribute *attr,
+               const char *buf, size_t n)
+{
+       struct musb     *musb = dev_to_musb(dev);
+       unsigned short  session;
+       u8              devctl;
+
+       if (sscanf(buf, "%hu", &session) != 1
+                       || (session != 1) || (session != 0)) {
+               dev_err(dev, "value must be 1 on 0\n");
+               return -EINVAL;
+       }
+
+       devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
+       if (session)
+               devctl |= MUSB_DEVCTL_SESSION;
+       else
+               devctl &= ~MUSB_DEVCTL_SESSION;
+
+       musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
+
+       return n;
+}
+static DEVICE_ATTR(session, 0644, NULL, musb_session_store);
+
 #ifdef CONFIG_USB_GADGET_MUSB_HDRC
 
 /* Gadget drivers can't know that a host is connected so they might want
@@ -1813,6 +1839,7 @@ static void musb_free(struct musb *musb)
         */
 
 #ifdef CONFIG_SYSFS
+       device_remove_file(musb->controller, &dev_attr_session);
        device_remove_file(musb->controller, &dev_attr_mode);
        device_remove_file(musb->controller, &dev_attr_vbus);
 #ifdef CONFIG_USB_MUSB_OTG
@@ -2047,6 +2074,7 @@ bad_config:
        }
 
 #ifdef CONFIG_SYSFS
+       status = device_create_file(dev, &dev_attr_session);
        status = device_create_file(dev, &dev_attr_mode);
        status = device_create_file(dev, &dev_attr_vbus);
 #ifdef CONFIG_USB_GADGET_MUSB_HDRC
@@ -2061,6 +2089,7 @@ bad_config:
 
 fail2:
 #ifdef CONFIG_SYSFS
+       device_remove_file(musb->controller, &dev_attr_session);
        device_remove_file(musb->controller, &dev_attr_mode);
        device_remove_file(musb->controller, &dev_attr_vbus);
 #ifdef CONFIG_USB_MUSB_OTG

-- 
balbi
--
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