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Date:   Mon, 16 Jan 2023 16:21:30 +0100
From:   Bjørn Mork <bjorn@...k.no>
To:     "Russell King (Oracle)" <linux@...linux.org.uk>
Cc:     Frank Wunderlich <frank-w@...lic-files.de>,
        Frank Wunderlich <linux@...web.de>,
        linux-mediatek@...ts.infradead.org,
        Alexander Couzens <lynxis@...0.eu>,
        Felix Fietkau <nbd@....name>, John Crispin <john@...ozen.org>,
        Sean Wang <sean.wang@...iatek.com>,
        Mark Lee <Mark-MC.Lee@...iatek.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] net: mtk_sgmii: implement mtk_pcs_ops

"Russell King (Oracle)" <linux@...linux.org.uk> writes:

> To prove the point, in mtk_pcs_config():
>
>         if (interface == PHY_INTERFACE_MODE_SGMII) {
>                 sgm_mode = SGMII_IF_MODE_SGMII;
>                 if (phylink_autoneg_inband(mode)) {
>
> Force the second if() to always be true, and see whether that allows
> traffic to pass.

Changed it with a printk to make sure I didn't mess up:

		if (1 || phylink_autoneg_inband(mode)) {
			pr_info("forcing AN\n");

But unfortunately without success.  Still same failure.  Output when
changing peer speed:

[   54.539438] mtk_soc_eth 15100000.ethernet wan: Link is Down
[   56.619937] mtk_sgmii_select_pcs: id=1
[   56.623690] mtk_pcs_config: interface=4
[   56.627511] offset:0 0x140
[   56.627513] offset:4 0x4d544950
[   56.630215] offset:8 0x20
[   56.633340] forcing AN
[   56.638292] mtk_pcs_config: rgc3=0x0, advertise=0x1 (changed), link_timer=1600000,  sgm_mode=0x103, bmcr=0x1000, use_an=1
[   56.649226] mtk_pcs_link_up: interface=4
[   56.653135] offset:0 0x81140
[   56.653137] offset:4 0x4d544950
[   56.656001] offset:8 0x1
[   56.659137] mtk_soc_eth 15100000.ethernet wan: Link is Up - 1Gbps/Full - flow control rx/tx

and the phy still reports this:

root@...nWrt:/# mdio mdio-bus 6:30 raw 9
0x000e



Bjørn

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