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

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Message-ID: <eddbe437-8a9f-c7df-4e68-8a45c6d89cdb@ti.com>
Date:   Thu, 15 Mar 2018 13:18:45 -0500
From:   Grygorii Strashko <grygorii.strashko@...com>
To:     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 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+?

-- 
regards,
-grygorii