Dear Alan,
If I add the following code to usb/host/ohci-hcd.c or define the flag
OHCI_VERBOSE_DEBUG, then the usb subsystem will work and there are no
errors. But it's very slowly. :(
If the delay value is smaller than 350, system will hang up.
So I think this problem is a timing problem, I don't know how to fix the
problem. Could you give me some suggestions?
static int ohci_urb_enqueue (
struct usb_hcd *hcd,
struct usb_host_endpoint *ep,
struct urb *urb,
gfp_t mem_flags
) {
struct ohci_hcd *ohci = hcd_to_ohci (hcd);
struct ed *ed;
urb_priv_t *urb_priv;
unsigned int pipe = urb->pipe;
int i, size = 0;
unsigned long flags;
int retval = 0;
mdelay(350); //delay 350 ms. This code will make the code worked.
#ifdef OHCI_VERBOSE_DEBUG
urb_print (urb, "SUB", usb_pipein (pipe));
#endif
/* every endpoint has a ed, locate and maybe (re)initialize it */
if (! (ed = ed_get (ohci, ep, urb->dev, pipe, urb->interval)))
return -ENOMEM;
Darwin Chen <[EMAIL PROTECTED]>
> What should I do in next steps?
>
> Try to find out what's wrong with the way your device or driver handles
> bulk-IN endpoints. For example, you might add a printk statement to
> ohci_irq, so you can see if the controller sends an interrupt request.
> You might print out the values stored in the TD when the URB is
> unlinked, so you can see if the controller received any bulk data.
>
> Alan Stern
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