From: Jernej Skrabec jernej.skrabec@siol.net
[ Upstream commit 2511366797fa6ab4a404b4b000ef7cd262aaafe8 ]
Depending on kernel and bootloader configuration, it's possible that Realtek ethernet PHY isn't powered on properly. According to the datasheet, it needs 30ms to power up and then some more time before it can be used.
Fix that by adding 100ms ramp delay to regulator responsible for powering PHY.
Fixes: 94dcfdc77fc5 ("arm64: allwinner: pine64-plus: Enable dwmac-sun8i") Suggested-by: Ondrej Jirman megous@megous.com Signed-off-by: Jernej Skrabec jernej.skrabec@siol.net Signed-off-by: Maxime Ripard mripard@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- arch/arm64/boot/dts/allwinner/sun50i-a64-pine64-plus.dts | 9 +++++++++ 1 file changed, 9 insertions(+)
diff --git a/arch/arm64/boot/dts/allwinner/sun50i-a64-pine64-plus.dts b/arch/arm64/boot/dts/allwinner/sun50i-a64-pine64-plus.dts index 24f1aac366d64..d5b6e8159a335 100644 --- a/arch/arm64/boot/dts/allwinner/sun50i-a64-pine64-plus.dts +++ b/arch/arm64/boot/dts/allwinner/sun50i-a64-pine64-plus.dts @@ -63,3 +63,12 @@ reg = <1>; }; }; + +®_dc1sw { + /* + * Ethernet PHY needs 30ms to properly power up and some more + * to initialize. 100ms should be plenty of time to finish + * whole process. + */ + regulator-enable-ramp-delay = <100000>; +};