netdev - Re: [PATCH v2] net: ethernet: ti: cpsw: add check for in-band mode setting with RGMII PHY interface

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Message-ID: <f2a255a8-945a-6248-0c28-5ed96fbfde0b@gmail.com>
Date:   Thu, 15 Mar 2018 11:29:07 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Grygorii Strashko <grygorii.strashko@...com>,
        SZ Lin (林上智) <sz.lin@...a.com>,
        "David S. Miller" <davem@...emloft.net>
Cc:     Schuyler Patton <spatton@...com>,
        Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org>,
        Keerthy <j-keerthy@...com>, Sekhar Nori <nsekhar@...com>,
        linux-omap@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] net: ethernet: ti: cpsw: add check for in-band mode
 setting with RGMII PHY interface

On 03/15/2018 11:18 AM, Grygorii Strashko wrote:
> 
> 
> On 03/15/2018 12:39 PM, Grygorii Strashko wrote:
>>
>>
>> On 03/15/2018 11:56 AM, SZ Lin (林上智) wrote:
>>> According to AM335x TRM[1] 14.3.6.2, AM437x TRM[2] 15.3.6.2 and
>>> DRA7 TRM[3] 24.11.4.8.7.3.3, in-band mode in EXT_EN(bit18) register
>>> is only
>>> available when PHY is configured in RGMII mode with 10Mbps speed. It
>>> will
>>> cause some networking issues without RGMII mode, such as carrier sense
>>> errors and low throughput. TI also mentioned this issue in their
>>> forum[4].
>>>
>>> This patch adds the check mechanism for PHY interface with RGMII
>>> interface
>>> type, the in-band mode can only be set in RGMII mode with 10Mbps speed.
>>>
>>> References:
>>> [1]: https://www.ti.com/lit/ug/spruh73p/spruh73p.pdf
>>> [2]: http://www.ti.com/lit/ug/spruhl7h/spruhl7h.pdf
>>> [3]: http://www.ti.com/lit/ug/spruic2b/spruic2b.pdf
>>> [4]: https://e2e.ti.com/support/arm/sitara_arm/f/791/p/640765/2392155
>>>
>>> Suggested-by: Holsety Chen (陳憲輝) <Holsety.Chen@...a.com>
>>> Signed-off-by: SZ Lin (林上智) <sz.lin@...a.com>
>>> Signed-off-by: Schuyler Patton <spatton@...com>
>>> ---
>>> Changes from v1:
>>> - Use phy_interface_is_rgmii helper function
>>> - Remove blank line
>>>
>>
>> Reviewed-by: Grygorii Strashko <grygorii.strashko@...com>
>>
> 
> Also could this be marked as stable material 4.9+?

This is not how it works for networking changes, just make sure you
provide a "Fixes:" tag, and David would usually take care of queueing
the change to -stable accordingly:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/networking/netdev-FAQ.txt#n148
-- 
Florian