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

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Date:   Thu, 15 Aug 2019 23:19:29 +0000
From:   Tao Ren <taoren@...com>
To:     Vladimir Oltean <olteanv@...il.com>
CC:     Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        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 4:15 PM, Vladimir Oltean wrote:
> Hi Tao,
> 
> On Fri, 16 Aug 2019 at 02:13, Tao Ren <taoren@...com> wrote:
>>
>> Hi Andrew / Florian / Heiner / Vladimir,
>>
>> Any further suggestions on the patch series?
>>
>>
>> Thanks,
>>
>> Tao
>>
>> 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>
>>> ---
> 
> The patchset looks good to me. However I am not a maintainer.
> If it helps,
> 
> Acked-by: Vladimir Oltean <olteanv@...il.com>

Thank you Vladimir!


Cheers,

Tao