USB: whci-hcd: provide a endpoint_reset method

Provide a endpoint_reset method to reset sequence number and current
window.  This QHead information can only be changed while the qset is
not in a schedule.
Signed-off-by: David Vrabel <david.vrabel@csr.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/usb/host/whci/asl.c

@@ -122,7 +122,8 @@ static uint32_t process_qset(struct whc *whc, struct whc_qset *qset)
 		process_inactive_qtd(whc, qset, td);
 	}
 
-	update |= qset_add_qtds(whc, qset);
+	if (!qset->remove)
+		update |= qset_add_qtds(whc, qset);
 
 done:
 	/*

drivers/usb/host/whci/hcd.c

@@ -186,6 +186,28 @@ static void whc_endpoint_disable(struct usb_hcd *usb_hcd,
 	}
 }
 
+static void whc_endpoint_reset(struct usb_hcd *usb_hcd,
+			       struct usb_host_endpoint *ep)
+{
+	struct wusbhc *wusbhc = usb_hcd_to_wusbhc(usb_hcd);
+	struct whc *whc = wusbhc_to_whc(wusbhc);
+	struct whc_qset *qset;
+
+	qset = ep->hcpriv;
+	if (qset) {
+		qset->remove = 1;
+
+		if (usb_endpoint_xfer_bulk(&ep->desc)
+		    || usb_endpoint_xfer_control(&ep->desc))
+			queue_work(whc->workqueue, &whc->async_work);
+		else
+			queue_work(whc->workqueue, &whc->periodic_work);
+
+		qset_reset(whc, qset);
+	}
+}
+
+
 static struct hc_driver whc_hc_driver = {
 	.description = "whci-hcd",
 	.product_desc = "Wireless host controller",
@@ -200,6 +222,7 @@ static struct hc_driver whc_hc_driver = {
 	.urb_enqueue = whc_urb_enqueue,
 	.urb_dequeue = whc_urb_dequeue,
 	.endpoint_disable = whc_endpoint_disable,
+	.endpoint_reset = whc_endpoint_reset,
 
 	.hub_status_data = wusbhc_rh_status_data,
 	.hub_control = wusbhc_rh_control,

drivers/usb/host/whci/pzl.c

@@ -128,7 +128,8 @@ static enum whc_update pzl_process_qset(struct whc *whc, struct whc_qset *qset)
 		process_inactive_qtd(whc, qset, td);
 	}
 
-	update |= qset_add_qtds(whc, qset);
+	if (!qset->remove)
+		update |= qset_add_qtds(whc, qset);
 
 done:
 	/*
@@ -353,7 +354,6 @@ void pzl_qset_delete(struct whc *whc, struct whc_qset *qset)
 	qset_delete(whc, qset);
 }
 
-
 /**
  * pzl_init - initialize the periodic zone list
  * @whc: the WHCI host controller

drivers/usb/host/whci/qset.c

@@ -89,11 +89,16 @@ static void qset_fill_qh(struct whc_qset *qset, struct urb *urb)
 		QH_INFO3_TX_RATE_53_3
 		| QH_INFO3_TX_PWR(0) /* 0 == max power */
 		);
+
+	qset->qh.cur_window = cpu_to_le32((1 << qset->max_burst) - 1);
 }
 
 /**
  * qset_clear - clear fields in a qset so it may be reinserted into a
- * schedule
+ * schedule.
+ *
+ * The sequence number and current window are not cleared (see
+ * qset_reset()).
  */
 void qset_clear(struct whc *whc, struct whc_qset *qset)
 {
@@ -101,9 +106,8 @@ void qset_clear(struct whc *whc, struct whc_qset *qset)
 	qset->remove = 0;
 
 	qset->qh.link = cpu_to_le32(QH_LINK_NTDS(8) | QH_LINK_T);
-	qset->qh.status = cpu_to_le16(QH_STATUS_ICUR(qset->td_start));
+	qset->qh.status = qset->qh.status & QH_STATUS_SEQ_MASK;
 	qset->qh.err_count = 0;
-	qset->qh.cur_window = cpu_to_le32((1 << qset->max_burst) - 1);
 	qset->qh.scratch[0] = 0;
 	qset->qh.scratch[1] = 0;
 	qset->qh.scratch[2] = 0;
@@ -113,6 +117,20 @@ void qset_clear(struct whc *whc, struct whc_qset *qset)
 	init_completion(&qset->remove_complete);
 }
 
+/**
+ * qset_reset - reset endpoint state in a qset.
+ *
+ * Clears the sequence number and current window.  This qset must not
+ * be in the ASL or PZL.
+ */
+void qset_reset(struct whc *whc, struct whc_qset *qset)
+{
+	wait_for_completion(&qset->remove_complete);
+
+	qset->qh.status &= ~QH_STATUS_SEQ_MASK;
+	qset->qh.cur_window = cpu_to_le32((1 << qset->max_burst) - 1);
+}
+
 /**
  * get_qset - get the qset for an async endpoint
  *

drivers/usb/host/whci/whcd.h

@@ -184,6 +184,7 @@ void qset_free(struct whc *whc, struct whc_qset *qset);
 struct whc_qset *get_qset(struct whc *whc, struct urb *urb, gfp_t mem_flags);
 void qset_delete(struct whc *whc, struct whc_qset *qset);
 void qset_clear(struct whc *whc, struct whc_qset *qset);
+void qset_reset(struct whc *whc, struct whc_qset *qset);
 int qset_add_urb(struct whc *whc, struct whc_qset *qset, struct urb *urb,
 		 gfp_t mem_flags);
 void qset_free_std(struct whc *whc, struct whc_std *std);

drivers/usb/host/whci/whci-hc.h

@@ -185,6 +185,7 @@ struct whc_qhead {
 #define QH_STATUS_FLOW_CTRL      (1 << 15)
 #define QH_STATUS_ICUR(i)        ((i) << 5)
 #define QH_STATUS_TO_ICUR(s)     (((s) >> 5) & 0x7)
+#define QH_STATUS_SEQ_MASK       0x1f
 
 /**
  * usb_pipe_to_qh_type - USB core pipe type to QH transfer type