netdev - Re: [PATCH] net: phy: realtek: fix RTL8211F interrupt mode

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Message-ID: <3a460dee-e714-e430-ce34-44c55d8a7490@gmail.com>
Date:   Sun, 12 Nov 2017 10:29:24 -0800
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Heiner Kallweit <hkallweit1@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Andrew Lunn <andrew@...n.ch>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "open list:ARM/Amlogic Meson..." <linux-amlogic@...ts.infradead.org>,
        Shengzhou Liu <Shengzhou.Liu@...escale.com>,
        Jerome Brunet <jbrunet@...libre.com>
Subject: Re: [PATCH] net: phy: realtek: fix RTL8211F interrupt mode

Hi Heiner,

On 11/12/2017 07:16 AM, Heiner Kallweit wrote:
> After commit b94d22d94ad22 "ARM64: dts: meson-gx: add external PHY
> interrupt on some platforms" ethernet stopped working on my Odroid-C2
> which has a RTL8211F phy.
> 
> It turned out that no interrupts were triggered. Further analysis
> showed the register INER can't be altered on page 0.
> Because register INSR needs to be accessed via page 0xa43 I assumed
> that register INER needs to be accessed via some page too.
> Some brute force check resulted in page 0xa42 being the right one.
> 
> With this patch the phy is working properly in interrupt mode.

What would be the appropriate Fixes: tag for that patch?

> 
> Signed-off-by: Heiner Kallweit <hkallweit1@...il.com>
> ---
>  drivers/net/phy/realtek.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/net/phy/realtek.c b/drivers/net/phy/realtek.c
> index d4670ecdb..eda0a6e86 100644
> --- a/drivers/net/phy/realtek.c
> +++ b/drivers/net/phy/realtek.c
> @@ -115,11 +115,13 @@ static int rtl8211f_config_intr(struct phy_device *phydev)
>  {
>  	int err;
>  
> +	phy_write(phydev, RTL821x_PAGE_SELECT, 0xa42);
>  	if (phydev->interrupts == PHY_INTERRUPT_ENABLED)
>  		err = phy_write(phydev, RTL821x_INER,
>  				RTL8211F_INER_LINK_STATUS);
>  	else
>  		err = phy_write(phydev, RTL821x_INER, 0);
> +	phy_write(phydev, RTL821x_PAGE_SELECT, 0);
>  
>  	return err;
>  }
> 

-- 
Florian