netdev - Re: riscv defconfig CONFIG_PM/macb/generic PHY regression in v5.18-rc1

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Date:   Tue, 05 Apr 2022 09:56:13 -0700 (PDT)
From:   Palmer Dabbelt <palmer@...osinc.com>
To:     linux@...linux.org.uk
CC:     Conor.Dooley@...rochip.com, apatel@...tanamicro.com,
        netdev@...r.kernel.org, Nicolas.Ferre@...rochip.com,
        Claudiu.Beznea@...rochip.com, andrew@...n.ch, hkallweit1@...il.com,
        linux-riscv@...ts.infradead.org
Subject:     Re: riscv defconfig CONFIG_PM/macb/generic PHY regression in v5.18-rc1

On Tue, 05 Apr 2022 08:53:06 PDT (-0700), linux@...linux.org.uk wrote:
> On Tue, Apr 05, 2022 at 01:05:12PM +0000, Conor.Dooley@...rochip.com wrote:
>> Hey,
>> I seem to have come across a regression in the default riscv defconfig
>> between riscv-for-linus-5.18-mw0 (bbde015227e8) & v5.18-rc1, exposed by
>> c5179ef1ca0c ("RISC-V: Enable RISC-V SBI CPU Idle driver for QEMU virt
>> machine") which causes the ethernet phy to not come up on my Icicle kit:
>> [ 3.179864] macb 20112000.ethernet eth0: validation of sgmii with support 0000000,00000000,00006280 and advertisement 0000000,00000000,00004280 failed: -EINVAL
>> [ 3.194490] macb 20112000.ethernet eth0: Could not attach PHY (-22)
>
> I don't think that would be related to the idle driver. This looks like
> the PHY hasn't filled in the supported mask at probe time - do you have
> the driver for the PHY built-in or the PHY driver module loaded?

IIRC we had a bunch of issues with the PHY on the HiFive Unleashed, 
there was a quirky reset sequence that it wouldn't even probe 
correctly without.  We have a 

    &eth0 {
            status = "okay";
            phy-mode = "gmii";
            phy-handle = <&phy0>;
            phy0: ethernet-phy@0 {
                    compatible = "ethernet-phy-id0007.0771";
                    reg = <0>;
            };
    };

in the Unleashed DT, but I can't find anything similar in the Icicle DT

    &mac1 {
            status = "okay";
            phy-mode = "sgmii";
            phy-handle = <&phy1>;
            phy1: ethernet-phy@9 {
                    reg = <9>;
                    ti,fifo-depth = <0x1>;
            };
            phy0: ethernet-phy@8 {
                    reg = <8>;
                    ti,fifo-depth = <0x1>;
            };
    };

I seem to remember picking that specific phy because it was similar to 
the one that was POR for the Icicle at the time we decided, maybe you 
have a similar phy with a similar quirk and need a similar workaround?