linux-kernel - [PATCH] usb: dwc2: resume root hub when device detect with suspend state

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Date:	Mon, 17 Nov 2014 21:14:37 +0800
From:	Kever Yang <kever.yang@...k-chips.com>
To:	Paul Zimmerman <paulz@...opsys.com>, Felipe Balbi <balbi@...com>
Cc:	Dinh Nguyen <dinguyen@...nsource.altera.com>,
	romain.perier@...il.com, Heiko Stuebner <heiko@...ech.de>,
	dianders@...omium.org, sonnyrao@...omium.org,
	addy.ke@...k-chips.com, cf@...k-chips.com, wulf@...k-chips.com,
	huangtao@...k-chips.com, linux-rockchip@...ts.infradead.org,
	Kever Yang <kever.yang@...k-chips.com>,
	Roy Li <roy.li@...k-chips.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] usb: dwc2: resume root hub when device detect with suspend state

After we implement the bus_suspend/resume, auto suspend id enabled.
The root hub will be auto suspend if there is no device connected,
we need to resume the root hub when a device connect detect.

This patch tested on rk3288.

Signed-off-by: Roy Li <roy.li@...k-chips.com>
Signed-off-by: Kever Yang <kever.yang@...k-chips.com>
---

 drivers/usb/dwc2/hcd_intr.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/usb/dwc2/hcd_intr.c b/drivers/usb/dwc2/hcd_intr.c
index 551ba87..c8299fd 100644
--- a/drivers/usb/dwc2/hcd_intr.c
+++ b/drivers/usb/dwc2/hcd_intr.c
@@ -355,6 +355,13 @@ static void dwc2_port_intr(struct dwc2_hsotg *hsotg)
 		hprt0_modify |= HPRT0_CONNDET;
 
 		/*
+		 * Check if root hub is in suspend state
+		 * if root hub in suspend, resume it.
+		 */
+		if ((bus->root_hub) && (hcd->state == HC_STATE_SUSPENDED))
+			usb_hcd_resume_root_hub(hcd);
+
+		/*
 		 * The Hub driver asserts a reset when it sees port connect
 		 * status change flag
 		 */
-- 
1.9.1

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