xhci features for usb-next

index 227e513867dd..fd7895b24367 100644
@@ -957,7 +957,7 @@ static void xhci_dbc_handle_events(struct work_struct *work)
 		/* set fast poll rate if there are pending data transfers */
 		if (!list_empty(&dbc->eps[BULK_OUT].list_pending) ||
 		    !list_empty(&dbc->eps[BULK_IN].list_pending))
-			poll_interval = 1;
+			poll_interval = 0;
 		break;
 	default:
 		dev_info(dbc->dev, "stop handling dbc events\n");

index d719c16ea30b..60ed753c85bb 100644
@@ -110,15 +110,74 @@ static void dbc_start_rx(struct dbc_port *port)
 	}
 }
 
+/*
+ * Queue received data to tty buffer and push it.
+ *
+ * Returns nr of remaining bytes that didn't fit tty buffer, i.e. 0 if all
+ * bytes sucessfullt moved. In case of error returns negative errno.
+ * Call with lock held
+ */
+static int dbc_rx_push_buffer(struct dbc_port *port, struct dbc_request *req)
+{
+	char		*packet = req->buf;
+	unsigned int	n, size = req->actual;
+	int		count;
+
+	if (!req->actual)
+		return 0;
+
+	/* if n_read is set then request was partially moved to tty buffer */
+	n = port->n_read;
+	if (n) {
+		packet += n;
+		size -= n;
+	}
+
+	count = tty_insert_flip_string(&port->port, packet, size);
+	if (count)
+		tty_flip_buffer_push(&port->port);
+	if (count != size) {
+		port->n_read += count;
+		return size - count;
+	}
+
+	port->n_read = 0;
+	return 0;
+}
+
 static void
 dbc_read_complete(struct xhci_dbc *dbc, struct dbc_request *req)
 {
 	unsigned long		flags;
 	struct dbc_port		*port = dbc_to_port(dbc);
+	struct tty_struct	*tty;
+	int			untransferred;
+
+	tty = port->port.tty;
 
 	spin_lock_irqsave(&port->port_lock, flags);
+
+	/*
+	 * Only defer copyig data to tty buffer in case:
+	 * - !list_empty(&port->read_queue), there are older pending data
+	 * - tty is throttled
+	 * - failed to copy all data to buffer, defer remaining part
+	 */
+
+	if (list_empty(&port->read_queue) && tty && !tty_throttled(tty)) {
+		untransferred = dbc_rx_push_buffer(port, req);
+		if (untransferred == 0) {
+			list_add_tail(&req->list_pool, &port->read_pool);
+			if (req->status != -ESHUTDOWN)
+				dbc_start_rx(port);
+			goto out;
+		}
+	}
+
+	/* defer moving data from req to tty buffer to a tasklet */
 	list_add_tail(&req->list_pool, &port->read_queue);
 	tasklet_schedule(&port->push);
+out:
 	spin_unlock_irqrestore(&port->port_lock, flags);
 }
 

@@ -331,10 +390,10 @@ static void dbc_rx_push(struct tasklet_struct *t)
 	struct dbc_request	*req;
 	struct tty_struct	*tty;
 	unsigned long		flags;
-	bool			do_push = false;
 	bool			disconnect = false;
 	struct dbc_port		*port = from_tasklet(port, t, push);
 	struct list_head	*queue = &port->read_queue;
+	int			untransferred;
 
 	spin_lock_irqsave(&port->port_lock, flags);
 	tty = port->port.tty;

@@ -356,42 +415,15 @@ static void dbc_rx_push(struct tasklet_struct *t)
 			break;
 		}
 
-		if (req->actual) {
-			char		*packet = req->buf;
-			unsigned int	n, size = req->actual;
-			int		count;
-
-			n = port->n_read;
-			if (n) {
-				packet += n;
-				size -= n;
-			}
-
-			count = tty_insert_flip_string(&port->port, packet,
-						       size);
-			if (count)
-				do_push = true;
-			if (count != size) {
-				port->n_read += count;
-				break;
-			}
-			port->n_read = 0;
-		}
+		untransferred = dbc_rx_push_buffer(port, req);
+		if (untransferred > 0)
+			break;
 
 		list_move_tail(&req->list_pool, &port->read_pool);
 	}
 
-	if (do_push)
-		tty_flip_buffer_push(&port->port);
-
-	if (!list_empty(queue) && tty) {
-		if (!tty_throttled(tty)) {
-			if (do_push)
-				tasklet_schedule(&port->push);
-			else
-				pr_warn("ttyDBC0: RX not scheduled?\n");
-		}
-	}
+	if (!list_empty(queue))
+		tasklet_schedule(&port->push);
 
 	if (!disconnect)
 		dbc_start_rx(port);

index 4cf5363875c7..da26e317ab0c 100644
@@ -422,7 +422,8 @@ static void xhci_handle_stopped_cmd_ring(struct xhci_hcd *xhci,
 	if ((xhci->cmd_ring->dequeue != xhci->cmd_ring->enqueue) &&
 	    !(xhci->xhc_state & XHCI_STATE_DYING)) {
 		xhci->current_cmd = cur_cmd;
-		xhci_mod_cmd_timer(xhci);
+		if (cur_cmd)
+			xhci_mod_cmd_timer(xhci);
 		xhci_ring_cmd_db(xhci);
 	}
 }

index da26e317ab0c..18ad33a01d32 100644
@@ -1652,12 +1652,13 @@ static void xhci_handle_cmd_nec_get_fw(struct xhci_hcd *xhci,
 			NEC_FW_MINOR(le32_to_cpu(event->status)));
 }
 
-static void xhci_complete_del_and_free_cmd(struct xhci_command *cmd, u32 status)
+static void xhci_complete_del_and_free_cmd(struct xhci_command *cmd, u32 comp_code, u32 comp_param)
 {
 	list_del(&cmd->cmd_list);
 
 	if (cmd->completion) {
-		cmd->status = status;
+		cmd->status = comp_code;
+		cmd->comp_param = comp_param;
 		complete(cmd->completion);
 	} else {
 		kfree(cmd);

@@ -1669,7 +1670,7 @@ void xhci_cleanup_command_queue(struct xhci_hcd *xhci)
 	struct xhci_command *cur_cmd, *tmp_cmd;
 	xhci->current_cmd = NULL;
 	list_for_each_entry_safe(cur_cmd, tmp_cmd, &xhci->cmd_list, cmd_list)
-		xhci_complete_del_and_free_cmd(cur_cmd, COMP_COMMAND_ABORTED);
+		xhci_complete_del_and_free_cmd(cur_cmd, COMP_COMMAND_ABORTED, 0);
 }
 
 void xhci_handle_command_timeout(struct work_struct *work)

@@ -1754,6 +1755,7 @@ static void handle_cmd_completion(struct xhci_hcd *xhci,
 		struct xhci_event_cmd *event)
 {
 	unsigned int slot_id = TRB_TO_SLOT_ID(le32_to_cpu(event->flags));
+	u32 status = le32_to_cpu(event->status);
 	u64 cmd_dma;
 	dma_addr_t cmd_dequeue_dma;
 	u32 cmd_comp_code;

@@ -1882,7 +1884,7 @@ static void handle_cmd_completion(struct xhci_hcd *xhci,
 	}
 
 event_handled:
-	xhci_complete_del_and_free_cmd(cmd, cmd_comp_code);
+	xhci_complete_del_and_free_cmd(cmd, cmd_comp_code, COMP_PARAM(status));
 
 	inc_deq(xhci, xhci->cmd_ring);
 }

index 4914f0a10cff..8c164340a2c3 100644
@@ -529,6 +529,7 @@ struct xhci_command {
 	/* Input context for changing device state */
 	struct xhci_container_ctx	*in_ctx;
 	u32				status;
+	u32				comp_param;
 	int				slot_id;
 	/* If completion is null, no one is waiting on this command
 	 * and the structure can be freed after the command completes.

@@ -959,6 +960,9 @@ struct xhci_event_cmd {
 	__le32 flags;
 };
 
+/* status bitmasks */
+#define COMP_PARAM(p)	((p) & 0xffffff) /* Command Completion Parameter */
+
 /* Address device - disable SetAddress */
 #define TRB_BSR		(1<<9)
 

index 9e94cebf4a56..f6b9a00a0ab9 100644
@@ -83,3 +83,9 @@
 #define	HCC2_CIC(p)		((p) & (1 << 5))
 /* true: HC support Extended TBC Capability, Isoc burst count > 65535 */
 #define	HCC2_ETC(p)		((p) & (1 << 6))
+/* true: HC support Extended TBC TRB Status Capability */
+#define HCC2_ETC_TSC(p)         ((p) & (1 << 7))
+/* true: HC support Get/Set Extended Property Capability */
+#define HCC2_GSC(p)             ((p) & (1 << 8))
+/* true: HC support Virtualization Based Trusted I/O Capability */
+#define HCC2_VTC(p)             ((p) & (1 << 9))