target/linux/lantiq/patches-4.19/0003-usb-dwc2-use-a-longer-core-rest-timeout-in-dwc2_core.patch

   1 From 09bbf8c732e7a6ce290fc7c2d5a3e79ec6c3e8d2 Mon Sep 17 00:00:00 2001
   2 From: Mathias Kresin <dev@kresin.me>
   3 Date: Wed, 3 Jul 2019 17:03:02 +0200
   4 Subject: [PATCH] usb: dwc2: use a longer core rest timeout in
   5  dwc2_core_reset()
   6
   7 Testing on different generations of Lantiq MIPS SoC based boards, showed
   8 that it takes up to 1500 us until the core reset bit is cleared.
   9
  10 The driver from the vendor SDK (ifxhcd) uses a 1 second timeout. Use the
  11 same timeout to fix wrong hang detections and make the driver work for
  12 Lantiq MIPS SoCs.
  13
  14 Signed-off-by: Mathias Kresin <dev@kresin.me>
  15 ---
  16  drivers/usb/dwc2/core.c | 2 +-
  17  1 file changed, 1 insertion(+), 1 deletion(-)
  18
  19 --- a/drivers/usb/dwc2/core.c
  20 +++ b/drivers/usb/dwc2/core.c
  21 @@ -524,7 +524,7 @@ int dwc2_core_reset(struct dwc2_hsotg *h
  22         greset |= GRSTCTL_CSFTRST;
  23         dwc2_writel(hsotg, greset, GRSTCTL);
  24
  25 -       if (dwc2_hsotg_wait_bit_clear(hsotg, GRSTCTL, GRSTCTL_CSFTRST, 50)) {
  26 +       if (dwc2_hsotg_wait_bit_clear(hsotg, GRSTCTL, GRSTCTL_CSFTRST, 10000)) {
  27                 dev_warn(hsotg->dev, "%s: HANG! Soft Reset timeout GRSTCTL GRSTCTL_CSFTRST\n",
  28                          __func__);
  29                 return -EBUSY;