target/linux/brcm2708/patches-4.19/950-0361-dwc_otg-only-do_split-when-we-actually-need-to-do-a-.patch

   1 From 0c988aed71773be4481b886ccf03c40a52f57cdb Mon Sep 17 00:00:00 2001
   2 From: P33M <p33m@github.com>
   3 Date: Mon, 8 Apr 2019 12:45:23 +0100
   4 Subject: [PATCH] dwc_otg: only do_split when we actually need to do a
   5  split
   6
   7 The previous test would fail if the root port was in fullspeed mode
   8 and there was a hub between the FS device and the root port. While
   9 the transfer worked, the schedule mangling performed for high-speed
  10 split transfers would break leading to an 8ms polling interval.
  11 ---
  12  drivers/usb/host/dwc_otg/dwc_otg_hcd_queue.c | 9 ++++-----
  13  1 file changed, 4 insertions(+), 5 deletions(-)
  14
  15 --- a/drivers/usb/host/dwc_otg/dwc_otg_hcd_queue.c
  16 +++ b/drivers/usb/host/dwc_otg/dwc_otg_hcd_queue.c
  17 @@ -167,8 +167,10 @@ void qh_init(dwc_otg_hcd_t * hcd, dwc_ot
  18         char *speed, *type;
  19         int dev_speed;
  20         uint32_t hub_addr, hub_port;
  21 +       hprt0_data_t hprt;
  22
  23         dwc_memset(qh, 0, sizeof(dwc_otg_qh_t));
  24 +       hprt.d32 = DWC_READ_REG32(hcd->core_if->host_if->hprt0);
  25
  26         /* Initialize QH */
  27         qh->ep_type = dwc_otg_hcd_get_pipe_type(&urb->pipe_info);
  28 @@ -191,9 +193,8 @@ void qh_init(dwc_otg_hcd_t * hcd, dwc_ot
  29
  30         qh->nak_frame = 0xffff;
  31
  32 -       if (((dev_speed == USB_SPEED_LOW) ||
  33 -            (dev_speed == USB_SPEED_FULL)) &&
  34 -           (hub_addr != 0 && hub_addr != 1)) {
  35 +       if (hprt.b.prtspd == DWC_HPRT0_PRTSPD_HIGH_SPEED &&
  36 +                       dev_speed != USB_SPEED_HIGH) {
  37                 DWC_DEBUGPL(DBG_HCD,
  38                             "QH init: EP %d: TT found at hub addr %d, for port %d\n",
  39                             dwc_otg_hcd_get_ep_num(&urb->pipe_info), hub_addr,
  40 @@ -204,7 +205,6 @@ void qh_init(dwc_otg_hcd_t * hcd, dwc_ot
  41
  42         if (qh->ep_type == UE_INTERRUPT || qh->ep_type == UE_ISOCHRONOUS) {
  43                 /* Compute scheduling parameters once and save them. */
  44 -               hprt0_data_t hprt;
  45
  46                 /** @todo Account for split transfers in the bus time. */
  47                 int bytecount =
  48 @@ -219,7 +219,6 @@ void qh_init(dwc_otg_hcd_t * hcd, dwc_ot
  49                                                     SCHEDULE_SLOP);
  50                 qh->interval = urb->interval;
  51
  52 -               hprt.d32 = DWC_READ_REG32(hcd->core_if->host_if->hprt0);
  53                 if (hprt.b.prtspd == DWC_HPRT0_PRTSPD_HIGH_SPEED) {
  54                         if (dev_speed == USB_SPEED_LOW ||
  55                                         dev_speed == USB_SPEED_FULL) {