On Tue, 15 Mar 2022 19:50:23 +0100 Jernej Škrabec jernej.skrabec@gmail.com wrote:

Hi Petr!

Dne torek, 15. marec 2022 ob 10:52:42 CET je Petr Štetiar napisal(a):

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This reverts commit 55dd7e059098ce4bd0a55c251cb78e74604abb57 as it breaks network on my A20-olinuxino-lime2 hardware revision "K" which has Micrel KSZ9031RNXCC-TR Gigabit PHY. Bastien has probably some previous hardware revisions which were based on RTL8211E-VB-CG1 PHY and thus this fix was working on his board.

NAK.

As Corentin mentioned in another discussion, new DT variant should be introduced for newer board model. Otherwise we can play this revert game with each new revision which changes Ethernet PHY behaviour. It also makes most sense to have naming chronologically sorted. If board name in DT file doesn't have any postfix, it should be compatible with earliest publicly available board. If board manufacturer releases new board variant with incompatible changes, new DT with appropriate postfix should be introduced.

I understand that this is frustrating for you, but whole situation around mentioned commit is unfortunate and we can't satisfy everyone.

Also good way to solve such issues is to apply DT overlay in bootloader based on board revision number. I know Olimex implemented DT fixup in their downstream U-Boot fork.

I agree with Jernej's here. I had a quick look into the U-Boot source, and it seem like the Micrel PHY should work there, since its phy_driver.config routine seems to ignore the phy-mode property (in contrast to its 9131 sibling in the same file). So we can go with the Realtek setting in the DT.

If U-Boot's networking itself is fine, we can just try to fix up the DT. Looks like board/sunxi/board.c:ft_board_setup() is the place. The PHY is autodetected, I am pretty sure we can somehow read the PHY driver name, and depending on that just patch the phy-mode property.

Does that sound like a way out?

Cheers, Andre

Best regards, Jernej

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Cc: stable@vger.kernel.org Cc: Bastien Roucariès rouca@debian.org References: https://github.com/openwrt/openwrt/issues/9153 References: https://github.com/OLIMEX/OLINUXINO/blob/master/HARDWARE/A20-OLinuXino-LIME2... Signed-off-by: Petr Štetiar ynezz@true.cz

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arch/arm/boot/dts/sun7i-a20-olinuxino-lime2.dts | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/boot/dts/sun7i-a20-olinuxino-lime2.dts b/arch/arm/boot/

dts/sun7i-a20-olinuxino-lime2.dts

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index ecb91fb899ff..8077f1716fbc 100644 --- a/arch/arm/boot/dts/sun7i-a20-olinuxino-lime2.dts +++ b/arch/arm/boot/dts/sun7i-a20-olinuxino-lime2.dts @@ -112,7 +112,7 @@ &gmac { pinctrl-names = "default"; pinctrl-0 = <&gmac_rgmii_pins>; phy-handle = <&phy1>;

• phy-mode = "rgmii-id";

• phy-mode = "rgmii"; status = "okay";

};