1 files changed, 35 insertions, 0 deletions
diff --git a/target/linux/lantiq/patches-4.19/0002-usb-dwc2-use-a-longer-AHB-idle-timeout-in-dwc2_core_.patch b/target/linux/lantiq/patches-4.19/0002-usb-dwc2-use-a-longer-AHB-idle-timeout-in-dwc2_core_.patch
new file mode 100644
index 0000000000..c004e44e4a
--- /dev/null
+++ b/target/linux/lantiq/patches-4.19/0002-usb-dwc2-use-a-longer-AHB-idle-timeout-in-dwc2_core_.patch
@@ -0,0 +1,35 @@
+From bfe92b01cafebb10f0d7f38dceb37433687b7887 Mon Sep 17 00:00:00 2001
+From: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
+Date: Thu, 20 Jun 2019 19:50:22 +0200
+Subject: [PATCH] usb: dwc2: use a longer AHB idle timeout in dwc2_core_reset()
+
+Use a 10000us AHB idle timeout in dwc2_core_reset() and make it
+consistent with the other "wait for AHB master IDLE state" ocurrences.
+
+This fixes a problem for me where dwc2 would not want to initialize when
+updating to 4.19 on a MIPS Lantiq VRX200 SoC. dwc2 worked fine with
+4.14.
+Testing on my board shows that it takes 180us until AHB master IDLE
+state is signalled. The very old vendor driver for this SoC (ifxhcd)
+used a 1 second timeout.
+Use the same timeout that is used everywhere when polling for
+GRSTCTL_AHBIDLE instead of using a timeout that "works for one board"
+(180us in my case) to have consistent behavior across the dwc2 driver.
+
+Cc: linux-stable <stable@vger.kernel.org> # 4.19+
+Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
+---
+ drivers/usb/dwc2/core.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+--- a/drivers/usb/dwc2/core.c
++++ b/drivers/usb/dwc2/core.c
+@@ -531,7 +531,7 @@ int dwc2_core_reset(struct dwc2_hsotg *h
+ 	}
+ 
+ 	/* Wait for AHB master IDLE state */
+-	if (dwc2_hsotg_wait_bit_set(hsotg, GRSTCTL, GRSTCTL_AHBIDLE, 50)) {
++	if (dwc2_hsotg_wait_bit_set(hsotg, GRSTCTL, GRSTCTL_AHBIDLE, 10000)) {
+ 		dev_warn(hsotg->dev, "%s: HANG! AHB Idle timeout GRSTCTL GRSTCTL_AHBIDLE\n",
+ 			 __func__);
+ 		return -EBUSY;