linux-kernel - Re: [net-next,v3,2/2] net: phy: realtek: Add support for PHY LEDs on RTL8211E

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Message-ID: <Z9gEP_w6WvuCC_ge@shell.armlinux.org.uk>
Date: Mon, 17 Mar 2025 11:15:11 +0000
From: "Russell King (Oracle)" <linux@...linux.org.uk>
To: Michael Klein <michael@...sekall.de>
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>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [net-next,v3,2/2] net: phy: realtek: Add support for PHY LEDs on
 RTL8211E

On Sun, Mar 16, 2025 at 01:14:23PM +0100, Michael Klein wrote:
> +static int rtl8211e_read_ext_page(struct phy_device *phydev, u16 ext_page,
> +				  u32 regnum)
> +{
> +	int oldpage, ret = 0;
> +
> +	oldpage = phy_select_page(phydev, RTL8211E_SET_EXT_PAGE);
> +	if (oldpage >= 0) {
> +		ret = __phy_write(phydev, RTL8211E_EXT_PAGE_SELECT, ext_page);
> +		if (!ret)

Same nit as patch 1.

> +static int rtl8211e_led_hw_control_get(struct phy_device *phydev, u8 index,
> +				       unsigned long *rules)
> +{
> +	int ret;
> +	u16 cr1, cr2;
> +
> +	if (index >= RTL8211x_LED_COUNT)
> +		return -EINVAL;
> +
> +	ret = rtl8211e_read_ext_page(phydev, RTL8211E_LEDCR_EXT_PAGE,
> +				     RTL8211E_LEDCR1);
> +	if (ret < 0)
> +		return ret;
> +
> +	cr1 = ret >> RTL8211E_LEDCR1_SHIFT * index;
> +	if (cr1 & RTL8211E_LEDCR1_ACT_TXRX) {
> +		set_bit(TRIGGER_NETDEV_RX, rules);
> +		set_bit(TRIGGER_NETDEV_TX, rules);
> +	}
> +
> +	ret = rtl8211e_read_ext_page(phydev, RTL8211E_LEDCR_EXT_PAGE,
> +				     RTL8211E_LEDCR2);
> +	if (ret < 0)
> +		return ret;
> +
> +	cr2 = ret >> RTL8211E_LEDCR2_SHIFT * index;
> +	if (cr2 & RTL8211E_LEDCR2_LINK_10)
> +		set_bit(TRIGGER_NETDEV_LINK_10, rules);
> +
> +	if (cr2 & RTL8211E_LEDCR2_LINK_100)
> +		set_bit(TRIGGER_NETDEV_LINK_100, rules);
> +
> +	if (cr2 & RTL8211E_LEDCR2_LINK_1000)
> +		set_bit(TRIGGER_NETDEV_LINK_1000, rules);

Do you need these set_bit()s to be a heavy-weight atomic operation, or
will __set_bit() being its lighter-weight non-atomic version be better?

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