From: Marek Vasut marex@denx.de
[ Upstream commit 36862c1ebc92a7e6fcc55002965c44b8ad17d4ca ]
The LAN8710 Energy Detect Power Down (EDPD) functionality might cause unreliable cable detection. There are multiple accounts of this in the SMSC PHY driver patches which attempted to make EDPD reliable, however it seems there is always some sort of corner case left. Unfortunatelly, there is no errata documented which would confirm this to be a silicon bug on the LAN87xx series of PHYs (LAN8700, LAN8710, LAN8720 at least).
Disable EDPD on the DHCOM SoM, just like multiple other boards already do as well, to make the cable detection reliable.
Fixes: 34e0c7847dcf ("ARM: dts: stm32: Add DH Electronics DHCOM STM32MP1 SoM and PDK2 board") Signed-off-by: Marek Vasut marex@denx.de Cc: Alexandre Torgue alexandre.torgue@foss.st.com Cc: Patrice Chotard patrice.chotard@foss.st.com Cc: Patrick Delaunay patrick.delaunay@foss.st.com Cc: linux-stm32@st-md-mailman.stormreply.com To: linux-arm-kernel@lists.infradead.org Signed-off-by: Alexandre Torgue alexandre.torgue@foss.st.com Signed-off-by: Sasha Levin sashal@kernel.org --- arch/arm/boot/dts/stm32mp15xx-dhcom-som.dtsi | 1 + 1 file changed, 1 insertion(+)
diff --git a/arch/arm/boot/dts/stm32mp15xx-dhcom-som.dtsi b/arch/arm/boot/dts/stm32mp15xx-dhcom-som.dtsi index 8349c9099e30..8c41f819f776 100644 --- a/arch/arm/boot/dts/stm32mp15xx-dhcom-som.dtsi +++ b/arch/arm/boot/dts/stm32mp15xx-dhcom-som.dtsi @@ -140,6 +140,7 @@ reset-gpios = <&gpioh 3 GPIO_ACTIVE_LOW>; reset-assert-us = <500>; reset-deassert-us = <500>; + smsc,disable-energy-detect; interrupt-parent = <&gpioi>; interrupts = <11 IRQ_TYPE_LEVEL_LOW>; };