linux-kernel - [PATCH v3 2/4] usb: aspeed-vhub: fix remote wakeup failure in iKVM use case

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Date:   Wed, 8 Dec 2021 18:05:43 +0800
From:   Neal Liu <neal_liu@...eedtech.com>
To:     Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Joel Stanley <joel@....id.au>,
        Andrew Jeffery <andrew@...id.au>,
        Cai Huoqing <caihuoqing@...du.com>,
        Tao Ren <rentao.bupt@...il.com>,
        Julia Lawall <julia.lawall@...ia.fr>,
        "kernel test robot" <lkp@...el.com>,
        Sasha Levin <sashal@...nel.org>, <linux-usb@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-aspeed@...ts.ozlabs.org>, <benh@...nel.crashing.org>
CC:     Neal Liu <neal_liu@...eedtech.com>, <BMC-SW@...eedtech.com>
Subject: [PATCH v3 2/4] usb: aspeed-vhub: fix remote wakeup failure in iKVM use case

Signaling remote wakeup if an emulated USB device has any activity
if the device is allowed by host.

Signed-off-by: Neal Liu <neal_liu@...eedtech.com>
---
 drivers/usb/gadget/udc/aspeed-vhub/epn.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/usb/gadget/udc/aspeed-vhub/epn.c b/drivers/usb/gadget/udc/aspeed-vhub/epn.c
index 917892ca8753..ccc239b5cc17 100644
--- a/drivers/usb/gadget/udc/aspeed-vhub/epn.c
+++ b/drivers/usb/gadget/udc/aspeed-vhub/epn.c
@@ -381,6 +381,11 @@ static int ast_vhub_epn_queue(struct usb_ep* u_ep, struct usb_request *u_req,
 	} else
 		u_req->dma = 0;
 
+	if (ep->dev->wakeup_en) {
+		EPVDBG(ep, "Wakeup host first\n");
+		ast_vhub_hub_wake_all(vhub);
+	}
+
 	EPVDBG(ep, "enqueue req @%p\n", req);
 	EPVDBG(ep, " l=%d dma=0x%x zero=%d noshort=%d noirq=%d is_in=%d\n",
 	       u_req->length, (u32)u_req->dma, u_req->zero,
-- 
2.25.1