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: <c27d5dd1-bcdc-a79e-bf0b-a7e93f5d9545@omp.ru>
Date:   Mon, 20 Nov 2023 22:44:46 +0300
From:   Sergey Shtylyov <s.shtylyov@....ru>
To:     Claudiu <claudiu.beznea@...on.dev>, <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 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...

> Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>

Reviewed-by: Sergey Shtylyov <s.shtylyov@....ru>

[...]

MBR, Sergey