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usb: renesas_usbhs: host: add endpoint user counter 

renesas_usbhs attaches pipe to endpoint when urb was queued, and it will be
detached when transfer was done.  Multi device controlling was enabled by this
behavior.

Now renesas_usbhs driver tried to wait until detaching if urb was queued to
endpoint which already has been attached to pipe, and it created strange driver
behavior.

But it can re-use this attached pipe if multi urb was queued.  This patch
implements it.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
Kuninori Morimoto 2012-11-06 00:11:53 -08:00 committed by Felipe Balbi
parent 24e4c1c30d
commit 7b332e5fef
1 changed files with 13 additions and 11 deletions
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24
drivers/usb/renesas_usbhs/mod_host.c
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@ -85,6 +85,7 @@ struct usbhsh_ep {
struct usbhsh_device *udev; /* attached udev */
struct usb_host_endpoint *ep;
struct list_head ep_list; /* list to usbhsh_device */
unsigned int counter; /* pipe attach counter */
};
#define USBHSH_DEVICE_MAX 10 /* see DEVADDn / DCPMAXP / PIPEMAXP */
@ -271,8 +272,12 @@ static int usbhsh_pipe_attach(struct usbhsh_hpriv *hpriv,
/******************** spin lock ********************/
usbhs_lock(priv, flags);
if (unlikely(usbhsh_uep_to_pipe(uep))) {
dev_err(dev, "uep already has pipe\n");
/*
* if uep has been attached to pipe,
* reuse it
*/
if (usbhsh_uep_to_pipe(uep)) {
ret = 0;
goto usbhsh_pipe_attach_done;
}
@ -320,6 +325,9 @@ static int usbhsh_pipe_attach(struct usbhsh_hpriv *hpriv,
}
usbhsh_pipe_attach_done:
if (0 == ret)
uep->counter++;
usbhs_unlock(priv, flags);
/******************** spin unlock ******************/
@ -341,7 +349,7 @@ static void usbhsh_pipe_detach(struct usbhsh_hpriv *hpriv,
if (unlikely(!pipe)) {
dev_err(dev, "uep doens't have pipe\n");
} else {
} else if (1 == uep->counter--) { /* last user */
struct usb_host_endpoint *ep = usbhsh_uep_to_ep(uep);
struct usbhsh_device *udev = usbhsh_uep_to_udev(uep);
@ -386,6 +394,7 @@ static int usbhsh_endpoint_attach(struct usbhsh_hpriv *hpriv,
/*
* init endpoint
*/
uep->counter = 0;
INIT_LIST_HEAD(&uep->ep_list);
list_add_tail(&uep->ep_list, &udev->ep_list_head);
@ -954,7 +963,6 @@ static int usbhsh_urb_enqueue(struct usb_hcd *hcd,
struct usb_host_endpoint *ep = urb->ep;
struct usbhsh_device *new_udev = NULL;
int is_dir_in = usb_pipein(urb->pipe);
int i;
int ret;
dev_dbg(dev, "%s (%s)\n", __func__, is_dir_in ? "in" : "out");
@ -1000,13 +1008,7 @@ static int usbhsh_urb_enqueue(struct usb_hcd *hcd,
* attach pipe to endpoint
* see [image of mod_host]
*/
for (i = 0; i < 1024; i++) {
ret = usbhsh_pipe_attach(hpriv, urb);
if (ret < 0)
msleep(100);
else
break;
}
ret = usbhsh_pipe_attach(hpriv, urb);
if (ret < 0) {
dev_err(dev, "pipe attach failed\n");
goto usbhsh_urb_enqueue_error_free_endpoint;