<html><head><meta name="color-scheme" content="light dark"></head><body><pre style="word-wrap: break-word; white-space: pre-wrap;">From 2ae3859a69cecc2820f768f4d22022000e9f2e22 Mon Sep 17 00:00:00 2001
From: Jonathan Bell &lt;jonathan@raspberrypi.org&gt;
Date: Wed, 7 Oct 2020 15:09:29 +0100
Subject: [PATCH] dwc_otg: initialise sched_frame for periodic QHs
 that were parked

If a periodic QH has no remaining QTDs, then it is removed from all
periodic schedules. When re-adding, initialise the sched_frame and
start_split_frame from the current value of the frame counter.

See https://bugs.launchpad.net/raspbian/+bug/1819560
and
 https://github.com/raspberrypi/linux/issues/3883

Signed-off-by: Jonathan Bell &lt;jonathan@raspberrypi.com&gt;
---
 drivers/usb/host/dwc_otg/dwc_otg_hcd_queue.c | 4 ++++
 1 file changed, 4 insertions(+)

--- a/drivers/usb/host/dwc_otg/dwc_otg_hcd_queue.c
+++ b/drivers/usb/host/dwc_otg/dwc_otg_hcd_queue.c
@@ -689,7 +689,11 @@ int dwc_otg_hcd_qh_add(dwc_otg_hcd_t * h
 				     &amp;qh-&gt;qh_list_entry);
 		//hcd-&gt;fiq_state-&gt;kick_np_queues = 1;
 	} else {
+		/* If the QH wasn't in a schedule, then sched_frame is stale. */
+		qh-&gt;sched_frame = dwc_frame_num_inc(dwc_otg_hcd_get_frame_number(hcd),
+							SCHEDULE_SLOP);
 		status = schedule_periodic(hcd, qh);
+		qh-&gt;start_split_frame = qh-&gt;sched_frame;
 		if ( !hcd-&gt;periodic_qh_count ) {
 			intr_mask.b.sofintr = 1;
 			if (fiq_enable) {
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