linux-kernel - Re: [PATCH net-next v2 4/5] net: phy: mediatek: Extend 1G TX/RX link pulse time

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Date: Sat, 18 May 2024 01:43:15 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Sky Huang <SkyLake.Huang@...iatek.com>
Cc: Heiner Kallweit <hkallweit1@...il.com>,
	Russell King <linux@...linux.org.uk>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Daniel Golle <daniel@...rotopia.org>,
	Qingfang Deng <dqfext@...il.com>,
	Matthias Brugger <matthias.bgg@...il.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org,
	Steven Liu <Steven.Liu@...iatek.com>
Subject: Re: [PATCH net-next v2 4/5] net: phy: mediatek: Extend 1G TX/RX link
 pulse time

> +int mtk_gphy_cl22_read_status(struct phy_device *phydev)
> +{
> +	int err, old_link = phydev->link;
> +	int mii_ctrl;
> +
> +	/* Update the link, but return if there was an error */
> +	err = genphy_update_link(phydev);
> +	if (err)
> +		return err;
> +
> +	/* why bother the PHY if nothing can have changed */
> +	if (phydev->autoneg == AUTONEG_ENABLE && old_link && phydev->link)
> +		return 0;
> +
> +	phydev->master_slave_get = MASTER_SLAVE_CFG_UNSUPPORTED;
> +	phydev->master_slave_state = MASTER_SLAVE_STATE_UNSUPPORTED;
> +	phydev->speed = SPEED_UNKNOWN;
> +	phydev->duplex = DUPLEX_UNKNOWN;
> +	phydev->pause = 0;
> +	phydev->asym_pause = 0;
> +
> +	if (phydev->is_gigabit_capable) {
> +		err = genphy_read_master_slave(phydev);
> +		if (err < 0)
> +			return err;
> +	}
> +
> +	err = genphy_read_lpa(phydev);
> +	if (err < 0)
> +		return err;
> +
> +	if (phydev->autoneg == AUTONEG_ENABLE) {
> +		if (phydev->autoneg_complete) {
> +			phy_resolve_aneg_linkmode(phydev);
> +		} else {
> +			mii_ctrl = phy_read(phydev, MII_CTRL1000);
> +			if ((mii_ctrl & ADVERTISE_1000FULL) || (mii_ctrl & ADVERTISE_1000HALF))
> +				extend_an_new_lp_cnt_limit(phydev);

This all looks very similar to genphy_read_status(), except these
three.

Would it be possible to call genphy_read_status() to do most of the
work, and then do these couple of lines of code.

      Andrew