usb: xhci-mtk: fix bpkts value of LS/HS periodic eps not behind TT
when a LS or FS device doesn't connect though a HS hub,
the @bPkts field of its periodic endpoint context should
be set to 1.
Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/usb/host/xhci-mtk-sch.c b/drivers/usb/host/xhci-mtk-sch.c
index c30de7c..73f763c 100644
--- a/drivers/usb/host/xhci-mtk-sch.c
+++ b/drivers/usb/host/xhci-mtk-sch.c
@@ -275,8 +275,9 @@
return false;
/*
- * for LS & FS periodic endpoints which its device don't attach
- * to TT are also ignored, root-hub will schedule them directly
+ * for LS & FS periodic endpoints which its device is not behind
+ * a TT are also ignored, root-hub will schedule them directly,
+ * but need set @bpkts field of endpoint context to 1.
*/
if (is_fs_or_ls(speed) && !has_tt)
return false;
@@ -339,8 +340,17 @@
GET_MAX_PACKET(usb_endpoint_maxp(&ep->desc)),
usb_endpoint_dir_in(&ep->desc), ep);
- if (!need_bw_sch(ep, udev->speed, slot_ctx->tt_info & TT_SLOT))
+ if (!need_bw_sch(ep, udev->speed, slot_ctx->tt_info & TT_SLOT)) {
+ /*
+ * set @bpkts to 1 if it is LS or FS periodic endpoint, and its
+ * device does not connected through an external HS hub
+ */
+ if (usb_endpoint_xfer_int(&ep->desc)
+ || usb_endpoint_xfer_isoc(&ep->desc))
+ ep_ctx->reserved[0] |= cpu_to_le32(EP_BPKTS(1));
+
return 0;
+ }
bw_index = get_bw_index(xhci, udev, ep);
sch_bw = &sch_array[bw_index];