41 lines
1.7 KiB
Diff
41 lines
1.7 KiB
Diff
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From 0a4c330869fbdd1a2372609cac13a98492e0e149 Mon Sep 17 00:00:00 2001
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From: Hal Emmerich <hal@halemmerich.com>
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Date: Wed, 21 Aug 2019 16:52:41 -0500
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Subject: [PATCH] Fix ath9k dwc2 init frame overruns
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This is a workaround for ar9271 drvices using the open ath9k firmware
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With the dwc2 usb driver these endpoints end up throwing piles of
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frame overrun errors and prevent the ath9k firmware from communicating
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properly with the c201
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This fix elongates the microframes by 4 so the dwc2 and ath9k devices
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communicate properly. In my testing this did not impact network speeds.
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---
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drivers/usb/dwc2/hcd_queue.c | 10 ++++++++++
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1 file changed, 10 insertions(+)
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diff --git a/drivers/usb/dwc2/hcd_queue.c b/drivers/usb/dwc2/hcd_queue.c
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index 68bbac6..8562db7 100644
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--- a/drivers/usb/dwc2/hcd_queue.c
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+++ b/drivers/usb/dwc2/hcd_queue.c
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@@ -1558,6 +1558,16 @@ static void dwc2_qh_init(struct dwc2_hsotg *hsotg, struct dwc2_qh *qh,
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device_ns += dwc_tt->usb_tt->think_time;
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qh->device_us = NS_TO_US(device_ns);
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+ //Only enable workaround for highspeed devices, since only low and full speed devices so split, we can just check split
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+ //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
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+ //The ath9k device has issues with ep 3 and ep4
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+ if(!do_split && !ep_is_isoc && ep_is_int && (urb->pipe_info.ep_num == 3 || urb->pipe_info.ep_num == 4)){
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+ if (urb->interval == 1){
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+ urb->interval = 4;
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+ dev_err(hsotg->dev, "PRAWNOS Set usb urb interval to %d\n", urb->interval);
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+ }
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+ }
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+
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qh->device_interval = urb->interval;
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qh->host_interval = urb->interval * (do_split ? 8 : 1);
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--
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2.11.0
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