Merge branch 'for-2.6.34-incoming' into for-2.6.35-incoming

[pandora-kernel.git] / drivers / usb / host / xhci-mem.c

diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c
index c09539b..d64f572 100644 (file)
--- a/drivers/usb/host/xhci-mem.c
+++ b/drivers/usb/host/xhci-mem.c
@@ -582,6 +582,19 @@ static inline unsigned int xhci_get_endpoint_interval(struct usb_device *udev,
        return EP_INTERVAL(interval);
 }
 
+/* The "Mult" field in the endpoint context is only set for SuperSpeed devices.
+ * High speed endpoint descriptors can define "the number of additional
+ * transaction opportunities per microframe", but that goes in the Max Burst
+ * endpoint context field.
+ */
+static inline u32 xhci_get_endpoint_mult(struct usb_device *udev,
+               struct usb_host_endpoint *ep)
+{
+       if (udev->speed != USB_SPEED_SUPER || !ep->ss_ep_comp)
+               return 0;
+       return ep->ss_ep_comp->desc.bmAttributes;
+}
+
 static inline u32 xhci_get_endpoint_type(struct usb_device *udev,
                struct usb_host_endpoint *ep)
 {
@@ -612,6 +625,36 @@ static inline u32 xhci_get_endpoint_type(struct usb_device *udev,
        return type;
 }
 
+/* Return the maximum endpoint service interval time (ESIT) payload.
+ * Basically, this is the maxpacket size, multiplied by the burst size
+ * and mult size.
+ */
+static inline u32 xhci_get_max_esit_payload(struct xhci_hcd *xhci,
+               struct usb_device *udev,
+               struct usb_host_endpoint *ep)
+{
+       int max_burst;
+       int max_packet;
+
+       /* Only applies for interrupt or isochronous endpoints */
+       if (usb_endpoint_xfer_control(&ep->desc) ||
+                       usb_endpoint_xfer_bulk(&ep->desc))
+               return 0;
+
+       if (udev->speed == USB_SPEED_SUPER) {
+               if (ep->ss_ep_comp)
+                       return ep->ss_ep_comp->desc.wBytesPerInterval;
+               xhci_warn(xhci, "WARN no SS endpoint companion descriptor.\n");
+               /* Assume no bursts, no multiple opportunities to send. */
+               return ep->desc.wMaxPacketSize;
+       }
+
+       max_packet = ep->desc.wMaxPacketSize & 0x3ff;
+       max_burst = (ep->desc.wMaxPacketSize & 0x1800) >> 11;
+       /* A 0 in max burst means 1 transfer per ESIT */
+       return max_packet * (max_burst + 1);
+}
+
 int xhci_endpoint_init(struct xhci_hcd *xhci,
                struct xhci_virt_device *virt_dev,
                struct usb_device *udev,
@@ -623,6 +666,7 @@ int xhci_endpoint_init(struct xhci_hcd *xhci,
        struct xhci_ring *ep_ring;
        unsigned int max_packet;
        unsigned int max_burst;
+       u32 max_esit_payload;
 
        ep_index = xhci_get_endpoint_index(&ep->desc);
        ep_ctx = xhci_get_ep_ctx(xhci, virt_dev->in_ctx, ep_index);
@@ -644,6 +688,7 @@ int xhci_endpoint_init(struct xhci_hcd *xhci,
        ep_ctx->deq = ep_ring->first_seg->dma | ep_ring->cycle_state;
 
        ep_ctx->ep_info = xhci_get_endpoint_interval(udev, ep);
+       ep_ctx->ep_info |= EP_MULT(xhci_get_endpoint_mult(udev, ep));
 
        /* FIXME dig Mult and streams info out of ep companion desc */
 
@@ -689,6 +734,26 @@ int xhci_endpoint_init(struct xhci_hcd *xhci,
        default:
                BUG();
        }
+       max_esit_payload = xhci_get_max_esit_payload(xhci, udev, ep);
+       ep_ctx->tx_info = MAX_ESIT_PAYLOAD_FOR_EP(max_esit_payload);
+
+       /*
+        * XXX no idea how to calculate the average TRB buffer length for bulk
+        * endpoints, as the driver gives us no clue how big each scatter gather
+        * list entry (or buffer) is going to be.
+        *
+        * For isochronous and interrupt endpoints, we set it to the max
+        * available, until we have new API in the USB core to allow drivers to
+        * declare how much bandwidth they actually need.
+        *
+        * Normally, it would be calculated by taking the total of the buffer
+        * lengths in the TD and then dividing by the number of TRBs in a TD,
+        * including link TRBs, No-op TRBs, and Event data TRBs.  Since we don't
+        * use Event Data TRBs, and we don't chain in a link TRB on short
+        * transfers, we're basically dividing by 1.
+        */
+       ep_ctx->tx_info |= AVG_TRB_LENGTH_FOR_EP(max_esit_payload);
+
        /* FIXME Debug endpoint context */
        return 0;
 }