From: Gregory Herrero <gregory.herrero@xxxxxxxxx>
If usb controller is in partial power down, any write to registers may
cause unpredictable behavior.
Thus, prevent any new request submission once controller is in partial
power down.
Signed-off-by: Gregory Herrero <gregory.herrero@xxxxxxxxx>
---
drivers/usb/dwc2/gadget.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/drivers/usb/dwc2/gadget.c b/drivers/usb/dwc2/gadget.c
index 539a3d4..72df171 100644
--- a/drivers/usb/dwc2/gadget.c
+++ b/drivers/usb/dwc2/gadget.c
@@ -790,6 +790,13 @@ static int s3c_hsotg_ep_queue(struct usb_ep *ep, struct usb_request *req,
ep->name, req, req->length, req->buf, req->no_interrupt,
req->zero, req->short_not_ok);
+ /* Prevent new request submission when controller is suspended */
+ if (hs->lx_state == DWC2_L2) {
+ dev_dbg(hs->dev, "%s: don't submit request while suspended\n",
+ __func__);
+ return -EAGAIN;
+ }
+
/* initialise status of the request */
INIT_LIST_HEAD(&hs_req->queue);
req->actual = 0;
--
1.9.1
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