[src/trunk]: src/sys/dev/usb Fix the logic around TT Hub Slot ID, TT Port Num...

[skrll <skrll%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/5e42faf322b5
branches:  trunk
changeset: 358293:5e42faf322b5
user:      skrll <skrll%NetBSD.org@localhost>
date:      Wed Dec 20 08:21:11 2017 +0000

description:
Fix the logic around TT Hub Slot ID, TT Port Number and Multi-TT in
xhci_setup_tthub.  TT Hub/Port need to reference the upstream HS hub and
Multi-TT needs to reflect the capabilities of a HS hub itself or the same
upstream HS hub.

diffstat:

 sys/dev/usb/xhci.c |  35 ++++++++++++++++++-----------------
 1 files changed, 18 insertions(+), 17 deletions(-)

diffs (84 lines):

diff -r acd70895bbc4 -r 5e42faf322b5 sys/dev/usb/xhci.c
--- a/sys/dev/usb/xhci.c        Wed Dec 20 08:10:13 2017 +0000
+++ b/sys/dev/usb/xhci.c        Wed Dec 20 08:21:11 2017 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: xhci.c,v 1.82 2017/12/19 16:04:27 skrll Exp $  */
+/*     $NetBSD: xhci.c,v 1.83 2017/12/20 08:21:11 skrll Exp $  */
 
 /*
  * Copyright (c) 2013 Jonathan A. Kollasch
@@ -34,7 +34,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: xhci.c,v 1.82 2017/12/19 16:04:27 skrll Exp $");
+__KERNEL_RCSID(0, "$NetBSD: xhci.c,v 1.83 2017/12/20 08:21:11 skrll Exp $");
 
 #ifdef _KERNEL_OPT
 #include "opt_usb.h"
@@ -3134,10 +3134,10 @@
 xhci_setup_tthub(struct usbd_pipe *pipe, uint32_t *cp)
 {
        struct usbd_device *dev = pipe->up_dev;
-       struct usbd_device *myhub = dev->ud_myhub;
        struct usbd_port *myhsport = dev->ud_myhsport;
        usb_device_descriptor_t * const dd = &dev->ud_ddesc;
        uint32_t speed = dev->ud_speed;
+       uint8_t rhaddr = dev->ud_bus->ub_rhaddr;
        uint8_t tthubslot, ttportnum;
        bool ishub;
        bool usemtt;
@@ -3159,8 +3159,8 @@
         *   parent hub is not HS hub ||
         *   attached to root hub.
         */
-       if (myhsport && myhub && myhub->ud_depth &&
-           myhub->ud_speed == USB_SPEED_HIGH &&
+       if (myhsport &&
+           myhsport->up_parent->ud_addr != rhaddr &&
            (speed == USB_SPEED_LOW || speed == USB_SPEED_FULL)) {
                ttportnum = myhsport->up_portno;
                tthubslot = myhsport->up_parent->ud_addr;
@@ -3185,29 +3185,30 @@
                DPRINTFN(4, "nports=%jd ttt=%jd", hd->bNbrPorts, ttt, 0, 0);
        }
 
-#define IS_TTHUB(dd) \
-    ((dd)->bDeviceProtocol == UDPROTO_HSHUBSTT || \
-     (dd)->bDeviceProtocol == UDPROTO_HSHUBMTT)
+#define IS_MTTHUB(dd) \
+     ((dd)->bDeviceProtocol == UDPROTO_HSHUBMTT)
 
        /*
         * MTT flag is set if
-        * 1. this is HS hub && MTT is enabled
-        *  or
-        * 2. this is not hub && this is LS or FS device &&
-        *    MTT of parent HS hub (and its parent, too) is enabled
+        * 1. this is HS hub && MTTs are supported and enabled;  or
+        * 2. this is LS or FS device && there is a parent HS hub where MTTs
+        *    are supported and enabled.
+        *
+        * XXX enabled is not tested yet
         */
-       if (ishub && speed == USB_SPEED_HIGH && IS_TTHUB(dd))
+       if (ishub && speed == USB_SPEED_HIGH && IS_MTTHUB(dd))
                usemtt = true;
-       else if (!ishub && (speed == USB_SPEED_LOW || speed == USB_SPEED_FULL) &&
-            myhub && myhub->ud_depth && myhub->ud_speed == USB_SPEED_HIGH &&
-            myhsport && IS_TTHUB(&myhsport->up_parent->ud_ddesc))
+       else if ((speed == USB_SPEED_LOW || speed == USB_SPEED_FULL) &&
+           myhsport &&
+           myhsport->up_parent->ud_addr != rhaddr &&
+           IS_MTTHUB(&myhsport->up_parent->ud_ddesc))
                usemtt = true;
        else
                usemtt = false;
        DPRINTFN(4, "class %ju proto %ju ishub %jd usemtt %jd",
            dd->bDeviceClass, dd->bDeviceProtocol, ishub, usemtt);
 
-#undef IS_TTHUB
+#undef IS_MTTHUB
 
        cp[0] |=
            XHCI_SCTX_0_HUB_SET(ishub ? 1 : 0) |