[PATCH v1] arm64: dts: ti: k3-am62-main: disable usb lpm
From: Andrejs Cainikovs
Date: Fri Feb 09 2024 - 08:02:32 EST
From: Andrejs Cainikovs <andrejs.cainikovs@xxxxxxxxxxx>
AM62 USB works with some devices, while failing to operate with others.
[ 560.189822] xhci-hcd xhci-hcd.4.auto: xHCI Host Controller
[ 560.195631] xhci-hcd xhci-hcd.4.auto: new USB bus registered, assigned bus number 2
[ 574.388509] xhci-hcd xhci-hcd.4.auto: can't setup: -110
[ 574.393814] xhci-hcd xhci-hcd.4.auto: USB bus 2 deregistered
[ 574.399544] xhci-hcd: probe of xhci-hcd.4.auto failed with error -110
This seems to be related to LPM (Link Power Management), and disabling it
turns USB into reliable working state.
As per AM62 reference manual:
> 4.8.2.1 USB2SS Unsupported Features
>
> The following features are not supported on this family of devices:
> ...
> - USB 2.0 ECN: Link Power Management (LPM)
> ...
Fixes: 2240f96cf3cd ("arm64: dts: ti: k3-am62-main: Add support for USB")
Signed-off-by: Andrejs Cainikovs <andrejs.cainikovs@xxxxxxxxxxx>
---
arch/arm64/boot/dts/ti/k3-am62-main.dtsi | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/arch/arm64/boot/dts/ti/k3-am62-main.dtsi b/arch/arm64/boot/dts/ti/k3-am62-main.dtsi
index 464b7565d085..c49fbce5cb70 100644
--- a/arch/arm64/boot/dts/ti/k3-am62-main.dtsi
+++ b/arch/arm64/boot/dts/ti/k3-am62-main.dtsi
@@ -640,6 +640,8 @@ usb0: usb@31000000 {
interrupt-names = "host", "peripheral";
maximum-speed = "high-speed";
dr_mode = "otg";
+ snps,usb2-gadget-lpm-disable;
+ snps,usb2-lpm-disable;
};
};
@@ -663,6 +665,8 @@ usb1: usb@31100000 {
interrupt-names = "host", "peripheral";
maximum-speed = "high-speed";
dr_mode = "otg";
+ snps,usb2-gadget-lpm-disable;
+ snps,usb2-lpm-disable;
};
};
--
2.34.1