Merge branch 'tracking-unsorted' into merge-linux-linaro

3 files changed, 42 insertions, 0 deletions

diff --git a/drivers/of/platform.c b/drivers/of/platform.c
index e44f8c2d239d..4150b9427047 100644
--- a/drivers/of/platform.c
+++ b/drivers/of/platform.c
@@ -348,6 +348,7 @@ static int of_platform_bus_create(struct device_node *bus,
 	struct platform_device *dev;
 	const char *bus_id = NULL;
 	void *platform_data = NULL;
+	int id = -1;
 	int rc = 0;
 
 	/* Make sure it has a compatible property */
@@ -360,6 +361,7 @@ static int of_platform_bus_create(struct device_node *bus,
 	auxdata = of_dev_lookup(lookup, bus);
 	if (auxdata) {
 		bus_id = auxdata->name;
+		id = auxdata->id;
 		platform_data = auxdata->platform_data;
 	}
 
@@ -369,6 +371,11 @@ static int of_platform_bus_create(struct device_node *bus,
 	}
 
 	dev = of_platform_device_create_pdata(bus, bus_id, platform_data, parent);
+
+	/* override the id if auxdata gives an id */
+	if (id != -1)
+		dev->id = id;
+
 	if (!dev || !of_match_node(matches, bus))
 		return 0;
 
diff --git a/drivers/usb/host/ehci-q.c b/drivers/usb/host/ehci-q.c
index 4378bf72bbac..a878ab1f6b99 100644
--- a/drivers/usb/host/ehci-q.c
+++ b/drivers/usb/host/ehci-q.c
@@ -1003,6 +1003,12 @@ static void qh_link_async (struct ehci_hcd *ehci, struct ehci_qh *qh)
 	head->qh_next.qh = qh;
 	head->hw->hw_next = dma;
 
+	/*
+	 * flush qh descriptor into memory immediately,
+	 * see comments in qh_append_tds.
+	 */
+	ehci_sync_mem();
+
 	qh_get(qh);
 	qh->xacterrs = 0;
 	qh->qh_state = QH_STATE_LINKED;
@@ -1090,6 +1096,18 @@ static struct ehci_qh *qh_append_tds (
 			wmb ();
 			dummy->hw_token = token;
 
+			/*
+			 * Writing to dma coherent buffer on ARM may
+			 * be delayed to reach memory, so HC may not see
+			 * hw_token of dummy qtd in time, which can cause
+			 * the qtd transaction to be executed very late,
+			 * and degrade performance a lot. ehci_sync_mem
+			 * is added to flush 'token' immediatelly into
+			 * memory, so that ehci can execute the transaction
+			 * ASAP.
+			 */
+			ehci_sync_mem();
+
 			urb->hcpriv = qh_get (qh);
 		}
 	}
diff --git a/drivers/usb/host/ehci.h b/drivers/usb/host/ehci.h
index 2694ed6558d2..b44c37d59ef0 100644
--- a/drivers/usb/host/ehci.h
+++ b/drivers/usb/host/ehci.h
@@ -748,6 +748,23 @@ static inline u32 hc32_to_cpup (const struct ehci_hcd *ehci, const __hc32 *x)
 
 #endif
 
+/*
+ * Writing to dma coherent memory on ARM may be delayed via L2
+ * writing buffer, so introduce the helper which can flush L2 writing
+ * buffer into memory immediately, especially used to flush ehci
+ * descriptor to memory.
+ */
+#ifdef	CONFIG_ARM_DMA_MEM_BUFFERABLE
+static inline void ehci_sync_mem()
+{
+	mb();
+}
+#else
+static inline void ehci_sync_mem()
+{
+}
+#endif
+
 /*-------------------------------------------------------------------------*/
 
 #ifdef CONFIG_PCI