xHCI 1.0: Control endpoint average TRB length field set
xHCI 1.0 specification indicates that software should set Average TRB Length
to '8' for control endpoints.
Signed-off-by: Andiry Xu <andiry.xu@amd.com>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c
index a4fc4d9..543833b 100644
--- a/drivers/usb/host/xhci-mem.c
+++ b/drivers/usb/host/xhci-mem.c
@@ -1246,8 +1246,15 @@
* 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.
+ *
+ * xHCI 1.0 specification indicates that the Average TRB Length should
+ * be set to 8 for control endpoints.
*/
- ep_ctx->tx_info |= cpu_to_le32(AVG_TRB_LENGTH_FOR_EP(max_esit_payload));
+ if (usb_endpoint_xfer_control(&ep->desc) && xhci->hci_version == 0x100)
+ ep_ctx->tx_info |= cpu_to_le32(AVG_TRB_LENGTH_FOR_EP(8));
+ else
+ ep_ctx->tx_info |=
+ cpu_to_le32(AVG_TRB_LENGTH_FOR_EP(max_esit_payload));
/* FIXME Debug endpoint context */
return 0;