From b765a16a11fad6b9c94fea7718c22692581e8d18 Mon Sep 17 00:00:00 2001 From: Chunfeng Yun Date: Tue, 26 Jan 2016 17:50:09 +0200 Subject: 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 Signed-off-by: Mathias Nyman Signed-off-by: Greg Kroah-Hartman 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 @@ static bool need_bw_sch(struct usb_host_endpoint *ep, 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 @@ int xhci_mtk_add_ep_quirk(struct usb_hcd *hcd, struct usb_device *udev, 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]; -- cgit v0.10.2