PrawnOS-nonfree/kernel/patches/kernel/0001-Fix-ath9k-dwc2-init-frame-overruns.patch

From 0a4c330869fbdd1a2372609cac13a98492e0e149 Mon Sep 17 00:00:00 2001
From: Hal Emmerich <hal@halemmerich.com>
Date: Wed, 21 Aug 2019 16:52:41 -0500
Subject: [PATCH] Fix ath9k dwc2 init frame overruns

This is a workaround for ar9271 drvices using the open ath9k firmware
With the dwc2 usb driver these endpoints end up throwing piles of
frame overrun errors and prevent the ath9k firmware from communicating
properly with the c201

This fix elongates the microframes by 4 so the dwc2 and ath9k devices
communicate properly. In my testing this did not impact network speeds.
---
 drivers/usb/dwc2/hcd_queue.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/usb/dwc2/hcd_queue.c b/drivers/usb/dwc2/hcd_queue.c
index 68bbac6..8562db7 100644
--- a/drivers/usb/dwc2/hcd_queue.c
+++ b/drivers/usb/dwc2/hcd_queue.c
@@ -1558,6 +1558,16 @@ static void dwc2_qh_init(struct dwc2_hsotg *hsotg, struct dwc2_qh *qh,
 			device_ns += dwc_tt->usb_tt->think_time;
 		qh->device_us = NS_TO_US(device_ns);
 
+    //Only enable workaround for highspeed devices, since only low and full speed devices so split, we can just check split
+    //The packets that fail right after the firmware is transferred are on an interrupt ep so we can use that to further narrow it down
+    //The ath9k device has issues with ep 3 and ep4
+    if(!do_split && !ep_is_isoc && ep_is_int && (urb->pipe_info.ep_num == 3 || urb->pipe_info.ep_num == 4)){
+      if (urb->interval == 1){
+        urb->interval = 4;
+        dev_err(hsotg->dev, "PRAWNOS Set usb urb interval to %d\n", urb->interval);
+      }
+    }
+
 		qh->device_interval = urb->interval;
 		qh->host_interval = urb->interval * (do_split ? 8 : 1);
 
-- 
2.11.0