lbmk/config/grub/xhci/patches/0023-xhci-configure-TT-for-non-root-hubs.patch

From 0a669ef9815267de4fb14f3c329431ac531755c9 Mon Sep 17 00:00:00 2001
From: Sven Anderson <sven@anderson.de>
Date: Mon, 13 Jan 2025 20:26:32 +0100
Subject: [PATCH 23/26] xhci: configure TT for non-root-hubs

---
 grub-core/bus/usb/usbhub.c |  6 +++++
 grub-core/bus/usb/xhci.c   | 45 +++++++++++++++++++++++++++++++++-----
 include/grub/usb.h         |  2 ++
 3 files changed, 47 insertions(+), 6 deletions(-)

diff --git a/grub-core/bus/usb/usbhub.c b/grub-core/bus/usb/usbhub.c
index e96505aa9..629b3ed53 100644
--- a/grub-core/bus/usb/usbhub.c
+++ b/grub-core/bus/usb/usbhub.c
@@ -818,3 +818,9 @@ grub_usb_iterate (grub_usb_iterate_hook_t hook, void *hook_data)
 
   return 0;
 }
+
+grub_usb_device_t
+grub_usb_get_dev (int addr)
+{
+  return grub_usb_devs[addr];
+}
diff --git a/grub-core/bus/usb/xhci.c b/grub-core/bus/usb/xhci.c
index dc89b9619..88c9ac57f 100644
--- a/grub-core/bus/usb/xhci.c
+++ b/grub-core/bus/usb/xhci.c
@@ -623,13 +623,46 @@ grub_xhci_alloc_inctx(struct grub_xhci *x, int maxepid,
       break;
   }
 
-  /* Route is greater zero on devices that are connected to a non root hub */
-  if (dev->route)
-    {
-      /* FIXME: Implement this code for non SuperSpeed hub devices */
+  /* Set routing string */
+  slot->ctx[0] |= dev->route;
+
+  /* Set root hub port number */
+  slot->ctx[1] |= (dev->root_port + 1) << 16;
+
+  if (dev->split_hubaddr && (dev->speed == GRUB_USB_SPEED_LOW ||
+                            dev->speed == GRUB_USB_SPEED_FULL)) {
+
+    grub_usb_device_t hubdev = grub_usb_get_dev(dev->split_hubaddr);
+
+    if (!hubdev || hubdev->descdev.class != GRUB_USB_CLASS_HUB) {
+      grub_dprintf("xhci", "Invalid hub device at addr %d!\n", dev->split_hubaddr);
+      return NULL;
+    }
+
+    struct grub_xhci_priv *hub_priv = hubdev->xhci_priv;
+    if (!hub_priv) {
+      grub_dprintf("xhci", "Hub has no xhci_priv!\n"); 
+      return NULL;
+    }
+
+    if (hubdev->speed == GRUB_USB_SPEED_HIGH) {
+      /* Direct connection to high-speed hub - set up TT */
+      grub_dprintf("xhci", "Direct high-speed hub connection - configuring TT with "
+                   "hub slot %d port %d\n", hub_priv->slotid, dev->split_hubport);
+      slot->ctx[2] |= hub_priv->slotid;
+      slot->ctx[2] |= dev->split_hubport << 8;
     }
-  slot->ctx[0]    |= dev->route;
-  slot->ctx[1]    |= (dev->root_port+1) << 16;
+    else {
+      /* Hub is not high-speed, inherit TT settings from parent */
+      volatile struct grub_xhci_slotctx *hubslot;
+      grub_dprintf("xhci", "Non high-speed hub - inheriting TT settings from parent\n");
+      hubslot = grub_dma_phys2virt(x->devs[hub_priv->slotid].ptr_low, x->devs_dma);
+      slot->ctx[2] = hubslot->ctx[2];
+    }
+  }
+
+  grub_dprintf("xhci", "Slot context: ctx[0]=0x%08x ctx[1]=0x%08x ctx[2]=0x%08x\n",
+               slot->ctx[0], slot->ctx[1], slot->ctx[2]);
 
   grub_arch_sync_dma_caches(in, size);
 
diff --git a/include/grub/usb.h b/include/grub/usb.h
index eb71fa1c7..df97a60cc 100644
--- a/include/grub/usb.h
+++ b/include/grub/usb.h
@@ -62,6 +62,8 @@ typedef int (*grub_usb_controller_iterate_hook_t) (grub_usb_controller_t dev,
 /* Call HOOK with each device, until HOOK returns non-zero.  */
 int grub_usb_iterate (grub_usb_iterate_hook_t hook, void *hook_data);
 
+grub_usb_device_t grub_usb_get_dev (int addr);
+
 grub_usb_err_t grub_usb_device_initialize (grub_usb_device_t dev);
 
 grub_usb_err_t grub_usb_get_descriptor (grub_usb_device_t dev,
-- 
2.39.5