[PATCH] sunxi: H6: Enable Ethernet on Orange Pi One Plus

[Andre Przywara]

On Tue, 11 Jul 2023 19:40:21 +0000
Anne Macedo <retpolanne at posteo.net> wrote:

Hi Anne,

thanks for reaching out to the list! But please try to avoid
pushing any patches downstream (Yocto) before they are accepted
or at least discussed upstream, see below.

> On 11.07.2023 02:39, Anne Macedo wrote:
> > Enable Ethernet on Orange Pi One Plus by using the correct phy for
> > Realtek RTL8211E instead of the Generic One. Also use CONFIG_MACPWR to
> > turn on ethernet on startup.
> > 
> > After this patch is applied, a few issues can be seen:
> > 
> > - there's still a PHY reset timed out error that doesn't seem to cause
> >   any impacts to the overall connection
> > 
> > - sometimes the emac driver times out after reset (yellow LED turns on
> >   and never blinks)
> > 
> > For future patches: for now, CONFIG_MACPWR is the only way to enable
> > Ethernet on boot. There's already code on the dts for using the 
> > 3v3-gmac
> > regulator. However, it is not probed on boot, so it only starts after a
> > "regulator status" command is issued.

MACPWR is going to go away (probably in the next two weeks), so please
have a look at this patch and see if that works for you:
https://github.com/apritzel/u-boot/commit/be1fdb42968

> > 
> > More details about the troubleshooting on [1].
> > 
> > [1]
> > https://lore.kernel.org/u-boot/4wsvwgy56e2xfgtvioru2tf2ofkqprlts36qggivxogww6pn5j@4jk63zxhzhag/
> > 
> > Signed-off-by: Anne Macedo <retpolanne at posteo.net>
> > ---
> >  arch/arm/dts/sun50i-h6-orangepi-one-plus.dts | 2 +-
> >  configs/orangepi_one_plus_defconfig          | 4 ++++
> >  2 files changed, 5 insertions(+), 1 deletion(-)
> > 
> > diff --git a/arch/arm/dts/sun50i-h6-orangepi-one-plus.dts
> > b/arch/arm/dts/sun50i-h6-orangepi-one-plus.dts
> > index 29a081e72a..6427c58f8a 100644
> > --- a/arch/arm/dts/sun50i-h6-orangepi-one-plus.dts
> > +++ b/arch/arm/dts/sun50i-h6-orangepi-one-plus.dts
> > @@ -37,7 +37,7 @@
> > 
> >  &mdio {
> >  	ext_rgmii_phy: ethernet-phy at 1 {
> > -		compatible = "ethernet-phy-ieee802.3-c22";
> > +		compatible = "ethernet-phy-id001c.c915", 
> > "ethernet-phy-ieee802.3-c22" ;

So this is really odd, why would you need that? 001c.c915 is the ID for
the normal standard Realtek 8211E PHY, which would be auto-detected via
MDIO. You just need to define CONFIG_PHY_REALTEK to include support.
Forcing this in the DT is not necessary and smells wrong.

But I suppose you needed that to get it to work, so could this be a
timing issue? Maybe the PHY doesn't come up quick enough after just
pulling PD6 high, so the auto-detection wouldn't work? The DT has a
"startup-delay-us = <100000>;" property, which MACPWR doesn't know
about and wouldn't observe.
So could you check whether just applying the "Remove MACPWR" patch, plus
adding "CONFIG_SUN8I_EMAC=y" and "CONFIG_PHY_REALTEK=y" to defconfig
fixes the issue? You may need to enable CONFIG_DM_REGULATOR_FIXED=y as
well, although this would become standard for all sunxi boards soon.

And you must NOT use SUNXI_SETUP_REGULATORS=0 in TF-A, as you need
ALDO2 to be set up by TF-A. We introduced this build option to
accommodate the OrangePi 3 board, which requires a specifically timed
regulator setup, which both TF-A and U-Boot would not observe. To not
crash the PHY with any incorrect regulator setup, we use this option to
make at least Linux work. The side effect is that some peripherals
(HDMI, Ethernet) will not work in U-Boot.
Also please note that a reset from Linux might not affect the PMIC, so
there might be different behaviour between and cold and warm boot.

Cheers,
Andre

> >  		reg = <1>;
> >  	};
> >  };
> > diff --git a/configs/orangepi_one_plus_defconfig
> > b/configs/orangepi_one_plus_defconfig
> > index aa5f540eb1..a1835492db 100644
> > --- a/configs/orangepi_one_plus_defconfig
> > +++ b/configs/orangepi_one_plus_defconfig
> > @@ -8,3 +8,7 @@ CONFIG_SUNXI_DRAM_H6_LPDDR3=y
> >  # CONFIG_SYS_MALLOC_CLEAR_ON_INIT is not set
> >  CONFIG_USB_EHCI_HCD=y
> >  CONFIG_USB_OHCI_HCD=y
> > +CONFIG_SUN8I_EMAC=y
> > +CONFIG_PHY_REALTEK=y
> > +CONFIG_PHY_ETHERNET_ID=y
> > +CONFIG_MACPWR="PD6"  
> 
> Adding linux-sunxi to the thread (I unfortunately forgot this list)
>