1 files changed, 33 insertions, 0 deletions
diff --git a/config/grub/xhci/patches/0005-xhci/0003-usbtrans-Set-default-maximum-packet-size.patch b/config/grub/xhci/patches/0005-xhci/0003-usbtrans-Set-default-maximum-packet-size.patch
new file mode 100644
index 00000000..70e73ca2
--- /dev/null
+++ b/config/grub/xhci/patches/0005-xhci/0003-usbtrans-Set-default-maximum-packet-size.patch
@@ -0,0 +1,33 @@
+From 3e25c83a1d1c6e149c7e9f0660ddadb2beca2476 Mon Sep 17 00:00:00 2001
+From: Patrick Rudolph <patrick.rudolph@9elements.com>
+Date: Sun, 15 Nov 2020 19:48:03 +0100
+Subject: [PATCH 3/8] usbtrans: Set default maximum packet size
+
+Set the maximum packet size to 512 for SuperSpeed devices.
+
+Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
+---
+ grub-core/bus/usb/usbtrans.c | 6 +++++-
+ 1 file changed, 5 insertions(+), 1 deletion(-)
+
+diff --git a/grub-core/bus/usb/usbtrans.c b/grub-core/bus/usb/usbtrans.c
+index c5680b33a..c1080bb33 100644
+--- a/grub-core/bus/usb/usbtrans.c
++++ b/grub-core/bus/usb/usbtrans.c
+@@ -128,8 +128,12 @@ grub_usb_control_msg (grub_usb_device_t dev,
+   setupdata_addr = grub_dma_get_phys (setupdata_chunk);
+ 
+   /* Determine the maximum packet size.  */
+-  if (dev->descdev.maxsize0)
++  if (dev->descdev.maxsize0 && dev->speed != GRUB_USB_SPEED_SUPER)
+     max = dev->descdev.maxsize0;
++  else if (dev->descdev.maxsize0 && dev->speed == GRUB_USB_SPEED_SUPER)
++    max = 1UL << dev->descdev.maxsize0;
++  else if (dev->speed == GRUB_USB_SPEED_SUPER)
++    max = 512;
+   else
+     max = 64;
+ 
+-- 
+2.39.2
+