Hi, On Sat, Jun 4, 2016 at 6:58 PM, Hans de Goede <hdegoede@xxxxxxxxxx> wrote: > It seems that recent kernels have a shorter timeout when scanning for > ethernet phys causing us to hit a timeout on boards where the phy's > regulator gets enabled just before scanning, which leads to non working > ethernet. > > A 10ms startup delay seems to be enough to fix it, this commit adds a > 20ms startup delay just to be safe. I couldn't find any power sequencing information on the RTL8201CP, which is what I assume these boards are using. The RTL8211E does mention after power ramp up, there's a 20ms delay before the core is ready. If 20ms works for you, I've nothing against it though. Just putting the information out there. > This has been tested on a sun4i-a10-a1000 and sun5i-a10s-wobo-i5 board, > both of which have non-working ethernet on recent kernels without this > fix. > > Cc: stable@xxxxxxxxxxxxxxx > Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx> > --- > Changes in v2: > -Add Cc stable > --- > arch/arm/boot/dts/sun4i-a10-a1000.dts | 1 + > arch/arm/boot/dts/sun4i-a10-hackberry.dts | 1 + > arch/arm/boot/dts/sun4i-a10-jesurun-q5.dts | 1 + > arch/arm/boot/dts/sun5i-a10s-wobo-i5.dts | 1 + > 4 files changed, 4 insertions(+) > > diff --git a/arch/arm/boot/dts/sun4i-a10-a1000.dts b/arch/arm/boot/dts/sun4i-a10-a1000.dts > index c92a1ae..fa70b8f 100644 > --- a/arch/arm/boot/dts/sun4i-a10-a1000.dts > +++ b/arch/arm/boot/dts/sun4i-a10-a1000.dts > @@ -84,6 +84,7 @@ > regulator-name = "emac-3v3"; > regulator-min-microvolt = <3300000>; > regulator-max-microvolt = <3300000>; > + startup-delay-us = <20000>; > enable-active-high; > gpio = <&pio 7 15 GPIO_ACTIVE_HIGH>; > }; > diff --git a/arch/arm/boot/dts/sun4i-a10-hackberry.dts b/arch/arm/boot/dts/sun4i-a10-hackberry.dts > index 2b17c51..6de83a6 100644 > --- a/arch/arm/boot/dts/sun4i-a10-hackberry.dts > +++ b/arch/arm/boot/dts/sun4i-a10-hackberry.dts > @@ -66,6 +66,7 @@ > regulator-name = "emac-3v3"; > regulator-min-microvolt = <3300000>; > regulator-max-microvolt = <3300000>; > + startup-delay-us = <20000>; > enable-active-high; > gpio = <&pio 7 19 GPIO_ACTIVE_HIGH>; > }; > diff --git a/arch/arm/boot/dts/sun4i-a10-jesurun-q5.dts b/arch/arm/boot/dts/sun4i-a10-jesurun-q5.dts > index 7afc7a6..e28f080 100644 > --- a/arch/arm/boot/dts/sun4i-a10-jesurun-q5.dts > +++ b/arch/arm/boot/dts/sun4i-a10-jesurun-q5.dts > @@ -80,6 +80,7 @@ > regulator-name = "emac-3v3"; > regulator-min-microvolt = <3300000>; > regulator-max-microvolt = <3300000>; > + startup-delay-us = <20000>; > enable-active-high; > gpio = <&pio 7 19 GPIO_ACTIVE_HIGH>; /* PH19 */ > }; > diff --git a/arch/arm/boot/dts/sun5i-a10s-wobo-i5.dts b/arch/arm/boot/dts/sun5i-a10s-wobo-i5.dts > index 52d18ca..b5de75f 100644 > --- a/arch/arm/boot/dts/sun5i-a10s-wobo-i5.dts > +++ b/arch/arm/boot/dts/sun5i-a10s-wobo-i5.dts > @@ -79,6 +79,7 @@ > regulator-name = "emac-3v3"; > regulator-min-microvolt = <3300000>; > regulator-max-microvolt = <3300000>; > + startup-delay-us = <20000>; > enable-active-high; > gpio = <&pio 0 2 GPIO_ACTIVE_HIGH>; > }; > -- > 2.7.4 > -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
