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>

1 files changed, 13 insertions, 11 deletions

diff --git a/drivers/usb/renesas_usbhs/mod_host.c b/drivers/usb/renesas_usbhs/mod_host.c
index 33f706387237..73c5039f7670 100644
--- a/drivers/usb/renesas_usbhs/mod_host.c
+++ b/drivers/usb/renesas_usbhs/mod_host.c
@@ -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;