linux-kernel - Re: [PATCH net-next v7 3/3] net: phy: broadcom: add 1000Base-X support for BCM54616S

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Message-ID: <d45d609b-60ea-760d-31f4-51afa379c55a@gmail.com>
Date:   Thu, 15 Aug 2019 16:36:50 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Tao Ren <taoren@...com>, Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Vladimir Oltean <olteanv@...il.com>,
        Arun Parameswaran <arun.parameswaran@...adcom.com>,
        Justin Chen <justinpopo6@...il.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, openbmc@...ts.ozlabs.org
Subject: Re: [PATCH net-next v7 3/3] net: phy: broadcom: add 1000Base-X
 support for BCM54616S

On 8/11/19 4:40 PM, Tao Ren wrote:
> The BCM54616S PHY cannot work properly in RGMII->1000Base-X mode, mainly
> because genphy functions are designed for copper links, and 1000Base-X
> (clause 37) auto negotiation needs to be handled differently.
> 
> This patch enables 1000Base-X support for BCM54616S by customizing 3
> driver callbacks, and it's verified to be working on Facebook CMM BMC
> platform (RGMII->1000Base-KX):
> 
>   - probe: probe callback detects PHY's operation mode based on
>     INTERF_SEL[1:0] pins and 1000X/100FX selection bit in SerDES 100-FX
>     Control register.
> 
>   - config_aneg: calls genphy_c37_config_aneg when the PHY is running in
>     1000Base-X mode; otherwise, genphy_config_aneg will be called.
> 
>   - read_status: calls genphy_c37_read_status when the PHY is running in
>     1000Base-X mode; otherwise, genphy_read_status will be called.
> 
> Note: BCM54616S PHY can also be configured in RGMII->100Base-FX mode, and
> 100Base-FX support is not available as of now.
> 
> Signed-off-by: Tao Ren <taoren@...com>

> -		reg = bcm_phy_read_shadow(phydev, BCM5482_SHD_MODE);
> -		bcm_phy_write_shadow(phydev, BCM5482_SHD_MODE,
> -				     reg | BCM5482_SHD_MODE_1000BX);
> +		reg = bcm_phy_read_shadow(phydev, BCM54XX_SHD_MODE);
> +		bcm_phy_write_shadow(phydev, BCM54XX_SHD_MODE,
> +				     reg | BCM54XX_SHD_MODE_1000BX);

This could have been a separate patch, but this looks reasonable to me
and this is correct with the datasheet, thanks Tao.

Reviewed-by: Florian Fainelli <f.fainelli@...il.com>
-- 
Florian