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

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Date:   Fri, 16 Aug 2019 01:33:04 +0000
From:   Tao Ren <taoren@...com>
To:     Florian Fainelli <f.fainelli@...il.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" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "openbmc@...ts.ozlabs.org" <openbmc@...ts.ozlabs.org>
Subject: Re: [PATCH net-next v7 3/3] net: phy: broadcom: add 1000Base-X
 support for BCM54616S

On 8/15/19 4:36 PM, Florian Fainelli wrote:
> 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>

Thank you FLorian.

It is great experience working with you all to figure out root cause and work out the patches, and I really appreciate it.


Cheers,

Tao