target/linux/bcm27xx/patches-5.4/950-0982-dwc_otg-initialise-sched_frame-for-periodic-QHs-that.patch

   1 From 2ae3859a69cecc2820f768f4d22022000e9f2e22 Mon Sep 17 00:00:00 2001
   2 From: Jonathan Bell <jonathan@raspberrypi.org>
   3 Date: Wed, 7 Oct 2020 15:09:29 +0100
   4 Subject: [PATCH] dwc_otg: initialise sched_frame for periodic QHs
   5  that were parked
   6
   7 If a periodic QH has no remaining QTDs, then it is removed from all
   8 periodic schedules. When re-adding, initialise the sched_frame and
   9 start_split_frame from the current value of the frame counter.
  10
  11 See https://bugs.launchpad.net/raspbian/+bug/1819560
  12 and
  13  https://github.com/raspberrypi/linux/issues/3883
  14
  15 Signed-off-by: Jonathan Bell <jonathan@raspberrypi.com>
  16 ---
  17  drivers/usb/host/dwc_otg/dwc_otg_hcd_queue.c | 4 ++++
  18  1 file changed, 4 insertions(+)
  19
  20 --- a/drivers/usb/host/dwc_otg/dwc_otg_hcd_queue.c
  21 +++ b/drivers/usb/host/dwc_otg/dwc_otg_hcd_queue.c
  22 @@ -689,7 +689,11 @@ int dwc_otg_hcd_qh_add(dwc_otg_hcd_t * h
  23                                      &qh->qh_list_entry);
  24                 //hcd->fiq_state->kick_np_queues = 1;
  25         } else {
  26 +               /* If the QH wasn't in a schedule, then sched_frame is stale. */
  27 +               qh->sched_frame = dwc_frame_num_inc(dwc_otg_hcd_get_frame_number(hcd),
  28 +                                                       SCHEDULE_SLOP);
  29                 status = schedule_periodic(hcd, qh);
  30 +               qh->start_split_frame = qh->sched_frame;
  31                 if ( !hcd->periodic_qh_count ) {
  32                         intr_mask.b.sofintr = 1;
  33                         if (fiq_enable) {