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

From: Kever Yang
Date: Mon Nov 17 2014 - 10:21:48 EST

This patch is no complete, Sorry for that, I will upload a new version tomorrow.

- Kever

On 11/17/2014 09:14 PM, Kever Yang wrote:
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 <>
Signed-off-by: Kever Yang <kever.yang@xxxxxxxxxxxxxx>

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

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