From: Andrejs Cainikovs andrejs.cainikovs@toradex.com
[ Upstream commit 9c99b337a8755a09df7735d4324ae26a6eca6261 ]
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@toradex.com Reviewed-by: Francesco Dolcini francesco.dolcini@toradex.com Reviewed-by: Roger Quadros rogerq@ti.com Link: https://lore.kernel.org/r/20240209130213.38908-1-andrejs.cainikovs@gmail.com Signed-off-by: Vignesh Raghavendra vigneshr@ti.com Signed-off-by: Sasha Levin sashal@kernel.org --- 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 e5c64c86d1d5a..c1ace4a376d17 100644 --- a/arch/arm64/boot/dts/ti/k3-am62-main.dtsi +++ b/arch/arm64/boot/dts/ti/k3-am62-main.dtsi @@ -623,6 +623,8 @@ usb0: usb@31000000 { interrupt-names = "host", "peripheral"; maximum-speed = "high-speed"; dr_mode = "otg"; + snps,usb2-gadget-lpm-disable; + snps,usb2-lpm-disable; }; };
@@ -646,6 +648,8 @@ usb1: usb@31100000 { interrupt-names = "host", "peripheral"; maximum-speed = "high-speed"; dr_mode = "otg"; + snps,usb2-gadget-lpm-disable; + snps,usb2-lpm-disable; }; };