This is a note to let you know that I've just added the patch titled
usb: dwc2: use a longer core rest timeout in dwc2_core_reset()
to my usb git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git
in the usb-testing branch.
The patch will show up in the next release of the linux-next tree
(usually sometime within the next 24 hours during the week.)
The patch will be merged to the usb-next branch sometime soon,
after it passes testing, and the merge window is open.
If you have any questions about this process, please let me know.
>From 6689f0f4bb14e50917ba42eb9b41c25e0184970c Mon Sep 17 00:00:00 2001
From: Mathias Kresin <dev@xxxxxxxxx>
Date: Sun, 7 Jul 2019 16:22:01 +0200
Subject: usb: dwc2: use a longer core rest timeout in dwc2_core_reset()
Testing on different generations of Lantiq MIPS SoC based boards, showed
that it takes up to 1500 us until the core reset bit is cleared.
The driver from the vendor SDK (ifxhcd) uses a 1 second timeout. Use the
same timeout to fix wrong hang detections and make the driver work for
Lantiq MIPS SoCs.
At least till kernel 4.14 the hanging reset only caused a warning but
the driver was probed successful. With kernel 4.19 errors out with
EBUSY.
Cc: linux-stable <stable@xxxxxxxxxxxxxxx> # 4.19+
Signed-off-by: Mathias Kresin <dev@xxxxxxxxx>
Signed-off-by: Felipe Balbi <felipe.balbi@xxxxxxxxxxxxxxx>
---
drivers/usb/dwc2/core.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/usb/dwc2/core.c b/drivers/usb/dwc2/core.c
index 8e41d70fd298..78a4925aa118 100644
--- a/drivers/usb/dwc2/core.c
+++ b/drivers/usb/dwc2/core.c
@@ -524,7 +524,7 @@ int dwc2_core_reset(struct dwc2_hsotg *hsotg, bool skip_wait)
greset |= GRSTCTL_CSFTRST;
dwc2_writel(hsotg, greset, GRSTCTL);
- if (dwc2_hsotg_wait_bit_clear(hsotg, GRSTCTL, GRSTCTL_CSFTRST, 50)) {
+ if (dwc2_hsotg_wait_bit_clear(hsotg, GRSTCTL, GRSTCTL_CSFTRST, 10000)) {
dev_warn(hsotg->dev, "%s: HANG! Soft Reset timeout GRSTCTL GRSTCTL_CSFTRST\n",
__func__);
return -EBUSY;
--
2.24.0
