Hi,

Finally I had the time and hardware available to look into this again and found a better way to fix it. Applying the attached patch results in a new exynos5422-odroidxu4.dtb that could simply be copied to /boot/dtbs/*/
I've tested this with the current kernel in sid (linux-image-4.12.0-2-armmp)
as well as stretch (linux-image-4.9.0-3-armmp). More tests welcome.

@Ben: This seems unintrusive enough to be included in the next stretch point release, what do you think?

Cheers Jochen
From 0d3552be829d5a275d549cbf6ab468bfdb026e49 Mon Sep 17 00:00:00 2001
From: Jochen Sprickerhof <g...@jochen.sprickerhof.de>
Date: Sun, 24 Sep 2017 08:28:12 +0200
Subject: [PATCH] ARM: dts: exynos: Use dwc3 quirk for USB3 and LAN on Odroid
 XU4

First proposed in https://lkml.org/lkml/2015/3/18/400 and discussed
again in https://lkml.org/lkml/2017/1/24/402.
---
 arch/arm/boot/dts/exynos5422-odroidxu4.dts | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/arm/boot/dts/exynos5422-odroidxu4.dts b/arch/arm/boot/dts/exynos5422-odroidxu4.dts
index 2faf88627a48..3861f74b2ecc 100644
--- a/arch/arm/boot/dts/exynos5422-odroidxu4.dts
+++ b/arch/arm/boot/dts/exynos5422-odroidxu4.dts
@@ -43,6 +43,11 @@
 	status = "okay";
 };
 
+&usbdrd_dwc3_0 {
+	snps,dis_u3_susphy_quirk;
+};
+
 &usbdrd_dwc3_1 {
 	dr_mode = "host";
+	snps,dis_u3_susphy_quirk;
 };
-- 
2.14.1

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