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Date:   Fri, 21 Oct 2022 08:04:51 +0200
From:   Frank Wunderlich <>
To:     "Russell King (Oracle)" <>,
        Frank Wunderlich <>
        Alexander Couzens <>,
        Felix Fietkau <>, John Crispin <>,
        Sean Wang <>,
        Mark Lee <>,
        "David S. Miller" <>,
        Eric Dumazet <>,
        Jakub Kicinski <>,
        Paolo Abeni <>,
        Matthias Brugger <>,,,
Subject: Re: [PATCH v2] net: mtk_sgmii: implement mtk_pcs_ops

Am 20. Oktober 2022 18:17:41 MESZ schrieb "Russell King (Oracle)" <>:
>On Thu, Oct 20, 2022 at 04:44:31PM +0200, Frank Wunderlich wrote:
>> diff --git a/drivers/net/ethernet/mediatek/mtk_sgmii.c b/drivers/net/ethernet/mediatek/mtk_sgmii.c
>> index 736839c84130..8b7465057e57 100644
>> --- a/drivers/net/ethernet/mediatek/mtk_sgmii.c
>> +++ b/drivers/net/ethernet/mediatek/mtk_sgmii.c
>> @@ -122,7 +122,21 @@ static void mtk_pcs_link_up(struct phylink_pcs *pcs, unsigned int mode,
>>  	regmap_write(mpcs->regmap, SGMSYS_SGMII_MODE, val);
>>  }
>> +static void mtk_pcs_get_state(struct phylink_pcs *pcs, struct phylink_link_state *state)
>> +{
>> +	struct mtk_pcs *mpcs = pcs_to_mtk_pcs(pcs);
>> +	unsigned int val;
>> +
>> +	regmap_read(mpcs->regmap, mpcs->ana_rgc3, &val);
>> +	state->speed = val & RG_PHY_SPEED_3_125G ? SPEED_2500 : SPEED_1000;
>> +
>Sorry, looking back at my initial comment on the first revision of this
>patch, I see my second point was confused. It should have read:
>"2) There should also be a setting for state->duplex."
>IOW, "duplex" instead of "pause".
>Also, is there no way to read the link partner advertisement?


On my board (bpi-r3) we have no autoneg on the gmacs. We have a switch (mt7531) with fixed-link on the first and a sfp-cage on the other. Second mac gets speed-setting (1000base-X or 2500base-X) from sfp eeprom, but no advertisement from the "other end". Imho it is always full duplex.

I have no register documentation to check if there is any way to read out pause/duplex setting. Maybe MTK can answer this or extend function later.

regards Frank

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