arm64: dts: ti: k3-am62-main: disable usb lpm

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>

diff --git a/arch/arm64/boot/dts/ti/k3-am62-main.dtsi b/arch/arm64/boot/dts/ti/k3-am62-main.dtsi
index ffb5a7c628d4bb2e280d0a4233b9538fc065dbad..03d4c0db07973945f298e297812f7798d2d74744 100644 (file)
--- a/arch/arm64/boot/dts/ti/k3-am62-main.dtsi
+++ b/arch/arm64/boot/dts/ti/k3-am62-main.dtsi
@@ -639,6 +639,8 @@
                        interrupt-names = "host", "peripheral";
                        maximum-speed = "high-speed";
                        dr_mode = "otg";
+                       snps,usb2-gadget-lpm-disable;
+                       snps,usb2-lpm-disable;
                };
        };
 
@@ -662,6 +664,8 @@
                        interrupt-names = "host", "peripheral";
                        maximum-speed = "high-speed";
                        dr_mode = "otg";
+                       snps,usb2-gadget-lpm-disable;
+                       snps,usb2-lpm-disable;
                };
        };