From b13287c47156776f0bd9878e916e11d23dda5638 Mon Sep 17 00:00:00 2001 From: Akashdeep Kaur Date: Fri, 19 Dec 2025 15:29:07 +0530 Subject: [PATCH] feat(pm_low_power_modes): AM62*: Add hardware workaround for USB1 LPM limitation Add documentation for USB1 low power mode limitation on SK-AM62-LP and SK-AM62P-LP E1/E1-1 EVMs. When USB1 is connected during low power mode entry, the EVM fails to resume to an active Linux state. Provide hardware workaround for both platforms: - SK-AM62-LP: Remove resistor R131 - SK-AM62P-LP E1/E1-1: Remove resistor R169 Signed-off-by: Akashdeep Kaur --- .../Power_Management/pm_low_power_modes.rst | 18 ++++++++++++++++-- 1 file changed, 16 insertions(+), 2 deletions(-) diff --git a/source/linux/Foundational_Components/Power_Management/pm_low_power_modes.rst b/source/linux/Foundational_Components/Power_Management/pm_low_power_modes.rst index 8fc351fa9..bea1efba1 100644 --- a/source/linux/Foundational_Components/Power_Management/pm_low_power_modes.rst +++ b/source/linux/Foundational_Components/Power_Management/pm_low_power_modes.rst @@ -389,10 +389,24 @@ Limitations .. important:: - When using low power modes on SK-AM62-LP EVM, USB **cannot** be connected - to anything. When USB is connected and a low power mode is entered, the + When using low power modes on SK-AM62-LP EVM, USB1 **cannot** be connected + to anything. When USB1 is connected and a low power mode is entered, the EVM fails to resume to an active Linux state. + **Hardware Workaround:** Remove resistor R131 from the SK-AM62-LP EVM to resolve + this limitation and enable proper resume from low power modes. + +.. ifconfig:: CONFIG_part_variant in ('AM62PX') + + .. important:: + + When using low power modes on SK-AM62P-LP E1 or E1-1 EVMs, USB1 **cannot** be connected + to anything. When USB1 is connected and a low power mode is entered, the + EVM fails to resume to an active Linux state. + + **Hardware Workaround:** Remove resistor R169 from the SK-AM62P-LP EVM to resolve + this limitation and enable proper resume from low power modes. + RT (Real-Time) Linux does not support any low power modes. HWRNG support on GP devices is incompatible with Deep Sleep and MCU Only