linux-kernel - Re: [PATCH 03/13] net: ravb: Make write access to CXR35 first before accessing other EMAC registers

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Message-ID: <2545ffad-e970-499e-9192-ff89776e1946@tuxon.dev>
Date:   Tue, 21 Nov 2023 08:02:35 +0200
From:   claudiu beznea <claudiu.beznea@...on.dev>
To:     Sergey Shtylyov <s.shtylyov@....ru>, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
        p.zabel@...gutronix.de, yoshihiro.shimoda.uh@...esas.com,
        geert+renesas@...der.be, wsa+renesas@...g-engineering.com,
        biju.das.jz@...renesas.com,
        prabhakar.mahadev-lad.rj@...renesas.com,
        sergei.shtylyov@...entembedded.com,
        mitsuhiro.kimura.kc@...esas.com, masaru.nagai.vx@...esas.com
Cc:     netdev@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
Subject: Re: [PATCH 03/13] net: ravb: Make write access to CXR35 first before
 accessing other EMAC registers



On 20.11.2023 21:44, Sergey Shtylyov wrote:
> On 11/20/23 11:45 AM, Claudiu wrote:
> 
>> From: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
>>
>> Hardware manual of RZ/G3S (and RZ/G2L) specifies the following on the
>> description of CXR35 register (chapter "PHY interface select register
>> (CXR35)"): "After release reset, make write-access to this register before
>> making write-access to other registers (except MDIOMOD). Even if not need
>> to change the value of this register, make write-access to this register
>> at least one time. Because RGMII/MII MODE is recognized by accessing this
>> register".
>>
>> The setup procedure for EMAC module (chapter "Setup procedure" of RZ/G3S,
>> RZ/G2L manuals) specifies the E-MAC.CXR35 register is the first EMAC
>> register that is to be configured.
>>
>> Note [A] from chapter "PHY interface select register (CXR35)" specifies
>> the following:
>> [A] The case which CXR35 SEL_XMII is used for the selection of RGMII/MII
>> in APB Clock 100 MHz.
>> (1) To use RGMII interface, Set ‘H’03E8_0000’ to this register.
>> (2) To use MII interface, Set ‘H’03E8_0002’ to this register.
>>
>> Take into account these indication.
>>
>> Fixes: 1089877ada8d ("ravb: Add RZ/G2L MII interface support")
> 
>    The bug fixes should be submitted separately and against the net.git repo...

OK, thanks for pointing it.

> 
>> Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
> 
> Reviewed-by: Sergey Shtylyov <s.shtylyov@....ru>
> 
> [...]
> 
> MBR, Sergey