linux-kernel - Re: [PATCH net v4 4/7] net: dsa: mt7530: fix handling of BPDUs on MT7530 switch

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Message-ID: <BEF93653-4380-423E-8B41-B4B18FB1F213@arinc9.com>
Date:   Thu, 15 Jun 2023 00:43:14 +0300
From:   Arınç ÜNAL <arinc.unal@...nc9.com>
To:     Vladimir Oltean <olteanv@...il.com>
CC:     Daniel Golle <daniel@...rotopia.org>,
        Landen Chao <Landen.Chao@...iatek.com>,
        DENG Qingfang <dqfext@...il.com>,
        Sean Wang <sean.wang@...iatek.com>,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Russell King <linux@...linux.org.uk>,
        Frank Wunderlich <frank-w@...lic-files.de>,
        Bartel Eerdekens <bartel.eerdekens@...stell8.be>,
        mithat.guner@...ont.com, erkin.bozoglu@...ont.com,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH net v4 4/7] net: dsa: mt7530: fix handling of BPDUs on MT7530 switch

On 15 June 2023 00:16:57 EEST, Vladimir Oltean <olteanv@...il.com> wrote:
>On Thu, Jun 15, 2023 at 12:05:44AM +0300, Arınç ÜNAL wrote:
>> On 14.06.2023 23:50, Vladimir Oltean wrote:
>> > Where have you seen the BPC register in the memory map of MT7530 or MT7621?
>> 
>> I did not somehow dump the memory map of the switch hardware and confirm the
>> BPC register is there, if that's what you're asking.
>
>I mean to say that I looked at
>
>MT7530 Giga Switch programming guide.pdf
>MT7621 Giga Switch Programming Guide.pdf
>MT7621_ProgrammingGuide_GSW_v01.pdf
>
>and I did not find this register.
>
>> However, I can confirm the register is there and identical across all MT7530
>> variants. I have tested the function of the register on the MCM MT7530 on
>> the MT7621 SoC and the standalone MT7530. The register is also described on
>> the document MT7620 Programming Guide v1.0, page 262.
>
>Interesting. I did not have that one. Hard to keep up.

I know the pain. The MT7530 registers are scattered throughout these four documents. TRGMII stuff is on MT7530 Giga Switch programming guide.pdf, etc. Good thing MT7531 Reference Manual for Development Board v1.0 has it all for MT7531.

Arınç