netdev - Re: net: phy: marvell: network working with generic PHY and not with marvell PHY

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Date:   Tue, 4 Jan 2022 15:46:19 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     "Russell King (Oracle)" <linux@...linux.org.uk>
Cc:     Corentin Labbe <clabbe.montjoie@...il.com>,
        linus.walleij@...aro.org, ulli.kroll@...glemail.com,
        kuba@...nel.org, davem@...emloft.net, hkallweit1@...il.com,
        linux-arm-kernel@...ts.infradead.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: net: phy: marvell: network working with generic PHY and not with
 marvell PHY

> @@ -1227,16 +1227,18 @@ static int m88e1118_config_init(struct phy_device *phydev)
>  {
>  	int err;
>  
> -	/* Change address */
> -	err = marvell_set_page(phydev, MII_MARVELL_MSCR_PAGE);
> -	if (err < 0)
> -		return err;
> -
>  	/* Enable 1000 Mbit */
> -	err = phy_write(phydev, 0x15, 0x1070);
> +	err = phy_write_paged(phydev, MII_MARVELL_MSCR_PAGE,
> +			      MII_88E1121_PHY_MSCR_REG, 0x1070);

Ah, yes, keeping this makes it more backwards compatible.

It would be nice to replace the 0x1070 with #defines.

We already have:

#define MII_88E1121_PHY_MSCR_RX_DELAY	BIT(5)
#define MII_88E1121_PHY_MSCR_TX_DELAY	BIT(4)
#define MII_88E1121_PHY_MSCR_DELAY_MASK	(BIT(5) | BIT(4))

Bits 6 is the MSB of the default MAC speed.
Bit 13 is the LSB of the default MAC speed. These two should default to 10b = 1000Mbps
Bit 12 is reserved, and should be written 1.

    Andrew