[PATCH 3/3] arm64: dts: qcom: x1e80100-microsoft-romulus: add phy-reinit-on-resume

[Oliver White]

The Surface Laptop 7 gates the USB2 PHY power domain during deep sleep, causing the PHY register state to be lost. When the DWC3 multi-port controller resumes via the fast path (device_may_wakeup), the PHY is not re-initialized and USB2 devices (such as the wired keyboard on the USB-A port) may exhibit corrupted signalling, e.g. stuck modifier key reports.

Enable the 'snps,reinit-phy-on-resume' quirk to force a full PHY re-initialization cycle on resume.
---
 arch/arm64/boot/dts/qcom/x1e80100-microsoft-romulus.dtsi | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/x1e80100-microsoft-romulus.dtsi b/arch/arm64/boot/dts/qcom/x1e80100-microsoft-romulus.dtsi
index 4356cb88e2bd..2de244ffb54d 100644
--- a/arch/arm64/boot/dts/qcom/x1e80100-microsoft-romulus.dtsi
+++ b/arch/arm64/boot/dts/qcom/x1e80100-microsoft-romulus.dtsi
@@ -1731,6 +1731,10 @@ &usb_mp {
 	status = "okay";
 };
 
+&usb_mp_dwc3 {
+	snps,reinit-phy-on-resume;
+};
+
 &usb_mp_hsphy0 {
 	vdd-supply = <&vreg_l2e>;
 	vdda12-supply = <&vreg_l2j>;
-- 
2.53.0