linux-kernel - Re: [PATCH net-next v2 4/5] net: mediatek: sgmii: set the speed according to the phy interface in AN

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Date:   Mon, 19 Sep 2022 12:15:43 +0100
From:   "Russell King (Oracle)" <linux@...linux.org.uk>
To:     Alexander Couzens <lynxis@...0.eu>
Cc:     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>,
        Daniel Golle <daniel@...rotopia.org>, netdev@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v2 4/5] net: mediatek: sgmii: set the speed
 according to the phy interface in AN

On Mon, Sep 19, 2022 at 10:37:11AM +0200, Alexander Couzens wrote:
> The non auto-negotioting code path is setting the correct speed for the
> interface. Ensure auto-negotiation code path is doing it as well.

While I see the logic in doing this in the autoneg path, if you look
at mtk_pcs_config(), you'll notice that this code you're adding is
unreachable.

If interface is PHY_INTERFACE_MODE_2500BASEX, then we will call
mtk_pcs_setup_mode_force(). We only call mtk_pcs_setup_mode_an() for
the PHY_INTERFACE_MODE_SGMII case when in-band mode is selected, so
this can become:

	regmap_read(mpcs->regmap, mpcs->ana_rgc3, &val);
	val &= ~RG_PHY_SPEED_MASK;
	regmap_write(mpcs->regmap, mpcs->ana_rgc3, val);

Thanks.

-- 
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