linux-kernel - Re: [PATCH net-next v5 4/5] net: phy: mediatek: Extend 1G TX/RX link pulse time

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Date: Thu, 30 May 2024 11:23:49 +0100
From: "Russell King (Oracle)" <linux@...linux.org.uk>
To: Sky Huang <SkyLake.Huang@...iatek.com>
Cc: Andrew Lunn <andrew@...n.ch>, Heiner Kallweit <hkallweit1@...il.com>,
	"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 v5 4/5] net: phy: mediatek: Extend 1G TX/RX link
 pulse time

Hi,

A few suggestions:

On Thu, May 30, 2024 at 11:48:43AM +0800, Sky Huang wrote:
> +static int extend_an_new_lp_cnt_limit(struct phy_device *phydev)
> +{
> +	int mmd_read_ret;
> +	u32 reg_val;
> +	int timeout;
> +
> +	timeout = read_poll_timeout(mmd_read_ret = phy_read_mmd, reg_val,
> +				    (mmd_read_ret < 0) || reg_val & MTK_PHY_FINAL_SPEED_1000,
> +				    10000, 1000000, false, phydev,
> +				    MDIO_MMD_VEND1, MTK_PHY_LINK_STATUS_MISC);

	timeout = phy_read_mmd_poll_timeout(phydev, MDIO_MMD_VEND1,
					    MTK_PHY_LINK_STATUS_MISC,
					    reg_val,
					    reg_val & MTK_PHY_FINAL_SPEED_1000,
					    10000, 1000000, false);

> +	if (mmd_read_ret < 0)
> +		return mmd_read_ret;

So, what if the poll times out (timeout == -ETIMEDOUT) ? If you want to
ignore that, then:

	if (timeout < 0 && timeout != -ETIMEDOUT)
		return timeout;

> +int mtk_gphy_cl22_read_status(struct phy_device *phydev)
> +{
> +	int ret;
> +
> +	ret = genphy_read_status(phydev);
> +	if (ret)
> +		return ret;
> +
> +	if (phydev->autoneg == AUTONEG_ENABLE && !phydev->autoneg_complete) {
> +		ret = phy_read(phydev, MII_CTRL1000);
> +		if ((ret & ADVERTISE_1000FULL) || (ret & ADVERTISE_1000HALF)) {

This is equivalent to:

		if (ret & (ADVERTISE_1000FULL | ADVERTISE_1000HALF)) {

which is easier to read.

Thanks.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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