From: Roger Quadros <rogerq@ti.com>
Date: Fri, 21 Apr 2017 12:58:08 +0000 (+0300)
Subject: usb: dwc3: gadget: Fix ISO transfer performance
X-Git-Tag: v4.14-rc1~869^2~30^2~4
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=f1d6826cae30e97e37a1f2481d7e1dc4faa09ce1;p=platform%2Fkernel%2Flinux-rpi.git

usb: dwc3: gadget: Fix ISO transfer performance

Commit 08a36b543803 ("usb: dwc3: gadget: simplify __dwc3_gadget_ep_queue()")
caused a small change in the way ISO transfer is handled in the case
when XferInProgress event happens on Isoc EP with an active transfer.
This caused a performance degradation of 50%. e.g. using g_webcam on DUT
and luvcview on host the video frame rate dropped from 16fps to 8fps
@high-speed.

Make the ISO transfer handling equivalent to that prior to that commit
to get back the original ISO performance numbers.

Fixes: 08a36b543803 ("usb: dwc3: gadget: simplify __dwc3_gadget_ep_queue()")
Signed-off-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
---

diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 6f6f0b3..3d61808 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -1261,14 +1261,24 @@ static int __dwc3_gadget_ep_queue(struct dwc3_ep *dep, struct dwc3_request *req)
 				__dwc3_gadget_start_isoc(dwc, dep, cur_uf);
 				dep->flags &= ~DWC3_EP_PENDING_REQUEST;
 			}
+			return 0;
 		}
-		return 0;
+
+		if ((dep->flags & DWC3_EP_BUSY) &&
+		    !(dep->flags & DWC3_EP_MISSED_ISOC)) {
+			WARN_ON_ONCE(!dep->resource_index);
+			ret = __dwc3_gadget_kick_transfer(dep,
+							  dep->resource_index);
+		}
+
+		goto out;
 	}
 
 	if (!dwc3_calc_trbs_left(dep))
 		return 0;
 
 	ret = __dwc3_gadget_kick_transfer(dep, 0);
+out:
 	if (ret == -EBUSY)
 		ret = 0;