linux-kernel - Re: [PATCH net-next] net: phy: realtek: enable ALDPS to save power for RTL8211F

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Date:   Fri, 18 Sep 2020 15:21:47 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Jisheng Zhang <Jisheng.Zhang@...aptics.com>
Cc:     Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next] net: phy: realtek: enable ALDPS to save power
 for RTL8211F

On Fri, Sep 18, 2020 at 10:47:56AM +0800, Jisheng Zhang wrote:
> Enable ALDPS function to save power when link down.

Hi Jisheng

It would be nice to give a hint what ALDPS means. It is not one of the
standard acronyms i know of, so it could be Realtek specific.

> 
> Signed-off-by: Jisheng Zhang <Jisheng.Zhang@...aptics.com>
> ---
>  drivers/net/phy/realtek.c | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/drivers/net/phy/realtek.c b/drivers/net/phy/realtek.c
> index 95dbe5e8e1d8..961570186822 100644
> --- a/drivers/net/phy/realtek.c
> +++ b/drivers/net/phy/realtek.c
> @@ -39,6 +39,10 @@
>  #define RTL8201F_ISR				0x1e
>  #define RTL8201F_IER				0x13
>  
> +#define RTL8211F_ALDPS_PLL_OFF			BIT(1)
> +#define RTL8211F_ALDPS_ENABLE			BIT(2)
> +#define RTL8211F_ALDPS_XTAL_OFF			BIT(12)
> +
>  #define RTL8366RB_POWER_SAVE			0x15
>  #define RTL8366RB_POWER_SAVE_ON			BIT(12)
>  
> @@ -178,8 +182,12 @@ static int rtl8211f_config_init(struct phy_device *phydev)
>  {
>  	struct device *dev = &phydev->mdio.dev;
>  	u16 val_txdly, val_rxdly;
> +	u16 val;
>  	int ret;
>  
> +	val = RTL8211F_ALDPS_ENABLE | RTL8211F_ALDPS_PLL_OFF | RTL8211F_ALDPS_XTAL_OFF;
> +	phy_modify_paged_changed(phydev, 0xa43, 0x18, val, val);

Could we avoid some of these magic numbers? The datasheet seems to
call 0x18 PHYCR1, etc.

     Andrew