linux-kernel - [PATCH 1/3] arm64: dts: exynos7870: add quirk to disable USB2 LPM in gadget mode

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Message-Id: <20250626-exynos7870-dts-fixes-v1-1-349987874d9a@disroot.org>
Date: Thu, 26 Jun 2025 13:02:56 +0530
From: Kaustabh Chakraborty <kauschluss@...root.org>
To: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Alim Akhtar <alim.akhtar@...sung.com>
Cc: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>, 
 devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
 linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Kaustabh Chakraborty <kauschluss@...root.org>, stable@...r.kernel.org
Subject: [PATCH 1/3] arm64: dts: exynos7870: add quirk to disable USB2 LPM
 in gadget mode

In gadget mode, USB connections are sluggish. The device won't send
packets to the host unless the host sends packets to the device. For
instance, SSH-ing through the USB network would apparently not work
unless you're flood-pinging the device's IP.

Add the property snps,usb2-gadget-lpm-disable to the dwc3 node, which
seems to solve this issue.

Fixes: d6f3a7f91fdb ("arm64: dts: exynos: add initial devicetree support for exynos7870")
Cc: stable@...r.kernel.org # v6.16
Signed-off-by: Kaustabh Chakraborty <kauschluss@...root.org>
---
 arch/arm64/boot/dts/exynos/exynos7870.dtsi | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/boot/dts/exynos/exynos7870.dtsi b/arch/arm64/boot/dts/exynos/exynos7870.dtsi
index 5cba8c9bb403405b2d9721ab8cf9d61e3d5faf95..d5d347623b9038b71da55dccdc9084aeaf71618c 100644
--- a/arch/arm64/boot/dts/exynos/exynos7870.dtsi
+++ b/arch/arm64/boot/dts/exynos/exynos7870.dtsi
@@ -327,6 +327,7 @@ usb@0 {
 				phys = <&usbdrd_phy 0>;
 
 				usb-role-switch;
+				snps,usb2-gadget-lpm-disable;
 			};
 		};
 

-- 
2.49.0