From 5ce1a24dd98c00a57a8fa13660648abf7e08e3ef Mon Sep 17 00:00:00 2001
From: Chunfeng Yun <chunfeng.yun@mediatek.com>
Date: Fri, 10 Jul 2020 13:57:52 +0800
Subject: [PATCH] usb: xhci-mtk: fix the failure of bandwidth allocation
Git-commit: 5ce1a24dd98c00a57a8fa13660648abf7e08e3ef
Patch-mainline: v5.8-rc7
References: git-fixes
The wMaxPacketSize field of endpoint descriptor may be zero
as default value in alternate interface, and they are not
actually selected when start stream, so skip them when try to
allocate bandwidth.
Cc: stable <stable@vger.kernel.org>
Fixes: 0cbd4b34cda9 ("xhci: mediatek: support MTK xHCI host controller")
Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Link: https://lore.kernel.org/r/1594360672-2076-1-git-send-email-chunfeng.yun@mediatek.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/usb/host/xhci-mtk-sch.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/usb/host/xhci-mtk-sch.c b/drivers/usb/host/xhci-mtk-sch.c
index fea555570ad4..45c54d56ecbd 100644
--- a/drivers/usb/host/xhci-mtk-sch.c
+++ b/drivers/usb/host/xhci-mtk-sch.c
@@ -557,6 +557,10 @@ static bool need_bw_sch(struct usb_host_endpoint *ep,
if (is_fs_or_ls(speed) && !has_tt)
return false;
+ /* skip endpoint with zero maxpkt */
+ if (usb_endpoint_maxp(&ep->desc) == 0)
+ return false;
+
return true;
}
--
2.16.4