netdev - Re: [PATCH v2 2/7] net: phy: realtek: Allow disabling RTL8211E EEE LED mode

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Date:   Wed, 3 Jul 2019 22:09:39 +0200
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     Matthias Kaehlcke <mka@...omium.org>,
        "David S . Miller" <davem@...emloft.net>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>
Cc:     netdev@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Douglas Anderson <dianders@...omium.org>
Subject: Re: [PATCH v2 2/7] net: phy: realtek: Allow disabling RTL8211E EEE
 LED mode

On 03.07.2019 21:37, Matthias Kaehlcke wrote:
> EEE LED mode is enabled by default on the RTL8211E. Disable it when
> the device tree property 'realtek,eee-led-mode-disable' exists.
> 
> The magic values to disable EEE LED mode were taken from the RTL8211E
> datasheet, unfortunately they are not further documented.
> 
> Signed-off-by: Matthias Kaehlcke <mka@...omium.org>
> ---
> Changes in v2:
> - patch added to the series
> ---
>  drivers/net/phy/realtek.c | 37 ++++++++++++++++++++++++++++++++++++-
>  1 file changed, 36 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/phy/realtek.c b/drivers/net/phy/realtek.c
> index a669945eb829..eb815cbe1e72 100644
> --- a/drivers/net/phy/realtek.c
> +++ b/drivers/net/phy/realtek.c
> @@ -9,8 +9,9 @@
>   * Copyright (c) 2004 Freescale Semiconductor, Inc.
>   */
>  #include <linux/bitops.h>
> -#include <linux/phy.h>
>  #include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/phy.h>
>  
>  #define RTL821x_PHYSR				0x11
>  #define RTL821x_PHYSR_DUPLEX			BIT(13)
> @@ -26,6 +27,10 @@
>  #define RTL821x_EXT_PAGE_SELECT			0x1e
>  #define RTL821x_PAGE_SELECT			0x1f
>  
> +/* RTL8211E page 5 */
> +#define RTL8211E_EEE_LED_MODE1			0x05
> +#define RTL8211E_EEE_LED_MODE2			0x06
> +
>  #define RTL8211F_INSR				0x1d
>  
>  #define RTL8211F_TX_DELAY			BIT(8)
> @@ -53,6 +58,35 @@ static int rtl821x_write_page(struct phy_device *phydev, int page)
>  	return __phy_write(phydev, RTL821x_PAGE_SELECT, page);
>  }
>  
> +static int rtl8211e_disable_eee_led_mode(struct phy_device *phydev)
> +{

You define return type int but AFAICS the return value is never used,
also in subsequent patches.

> +	int ret = 0;
> +	int oldpage;
> +
> +	oldpage = phy_select_page(phydev, 5);
> +	if (oldpage < 0)
> +		goto out;
> +
> +	/* write magic values to disable EEE LED mode */
> +	ret = __phy_write(phydev, RTL8211E_EEE_LED_MODE1, 0x8b82);
> +	if (ret)
> +		goto out;
> +
> +	ret = __phy_write(phydev, RTL8211E_EEE_LED_MODE2, 0x052b);
> +
> +out:
> +	return phy_restore_page(phydev, oldpage, ret);
> +}
> +
> +static int rtl8211e_config_init(struct phy_device *phydev)
> +{
> +	struct device *dev = &phydev->mdio.dev;
> +
> +	if (of_property_read_bool(dev->of_node, "realtek,eee-led-mode-disable"))
> +		rtl8211e_disable_eee_led_mode(phydev);
> +
> +	return 0;
> +}

I suppose checkpatch complains about the missing empty line.
You add it in a later patch, in case of a v3 you could fix that.

>  static int rtl8201_ack_interrupt(struct phy_device *phydev)
>  {
>  	int err;
> @@ -310,6 +344,7 @@ static struct phy_driver realtek_drvs[] = {
>  		.name		= "RTL8211E Gigabit Ethernet",
>  		.config_init	= &rtl8211e_config_init,
>  		.ack_interrupt	= &rtl821x_ack_interrupt,
> +		.config_init	= &rtl8211e_config_init,
>  		.config_intr	= &rtl8211e_config_intr,
>  		.suspend	= genphy_suspend,
>  		.resume		= genphy_resume,
>