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

[Kever Yang]

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 at rock-chips.com>
Signed-off-by: Kever Yang <kever.yang at rock-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