From: Kevin O'Connor <kevin@koconnor.net>
Date: Wed, 31 Dec 2014 06:40:07 +0000 (-0500)
Subject: uhci: Enable "depth" tree traversal for bulk transfers
X-Git-Tag: rel-1.8.0~20
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=1fdc26ec96d7bb1b356775f2c1ae10956f2bcd6f;p=people%2Fandrewcoop%2Fseabios.git

uhci: Enable "depth" tree traversal for bulk transfers

Set the "depth" flag on bulk transactions.  Since SeaBIOS doesn't use
bandwidth reclamation, without the depth flag the uhci controller will
only transfer one bulk packet per 1 ms frame.  This results in a
maximum of 64 bytes per millisecond, which severely limits the
transfer rate.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
---

diff --git a/src/hw/usb-uhci.c b/src/hw/usb-uhci.c
index 6dcc340..7ef50d1 100644
--- a/src/hw/usb-uhci.c
+++ b/src/hw/usb-uhci.c
@@ -537,9 +537,9 @@ uhci_send_bulk(struct usb_pipe *p, int dir, void *data, int datasize)
         int transfer = datasize;
         if (transfer > maxpacket)
             transfer = maxpacket;
-        struct uhci_td *nexttd_fl = MAKE_FLATPTR(GET_SEG(SS)
-                                                 , &tds[tdpos % STACKTDS]);
-        td->link = (transfer==datasize ? UHCI_PTR_TERM : (u32)nexttd_fl);
+        u32 nexttd = (u32)MAKE_FLATPTR(GET_SEG(SS), &tds[tdpos % STACKTDS]);
+        td->link = (transfer==datasize
+                    ? UHCI_PTR_TERM : (nexttd | UHCI_PTR_DEPTH));
         td->token = (uhci_explen(transfer) | toggle
                      | (devaddr << TD_TOKEN_DEVADDR_SHIFT)
                      | (dir ? USB_PID_IN : USB_PID_OUT));