linux-kernel - [PATCH v2] usb: dwc2: resume root hub when device detect with suspend state

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Date:	Tue, 18 Nov 2014 09:21:24 +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 v2] 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>
---

Changes in v2:
- add definition for hcd structure
- remove check for bus->root_hub

 drivers/usb/dwc2/hcd_intr.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/usb/dwc2/hcd_intr.c b/drivers/usb/dwc2/hcd_intr.c
index 551ba87..680206f 100644
--- a/drivers/usb/dwc2/hcd_intr.c
+++ b/drivers/usb/dwc2/hcd_intr.c
@@ -329,6 +329,7 @@ static void dwc2_port_intr(struct dwc2_hsotg *hsotg)
 {
 	u32 hprt0;
 	u32 hprt0_modify;
+	struct usb_hcd *hcd = (struct usb_hcd *)hsotg->priv;
 
 	dev_vdbg(hsotg->dev, "--Port Interrupt--\n");
 
@@ -354,6 +355,10 @@ static void dwc2_port_intr(struct dwc2_hsotg *hsotg)
 		hsotg->flags.b.port_connect_status = 1;
 		hprt0_modify |= HPRT0_CONNDET;
 
+		/* resume root hub? */
+		if (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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