netdev - Re: [PATCH net] net: dsa: mt7530: permit port 5 to work without port 6 on MT7621 SoC

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Date:   Thu, 09 Mar 2023 07:30:19 +0000
From:   patchwork-bot+netdevbpf@...nel.org
To:     Vladimir Oltean <vladimir.oltean@....com>
Cc:     netdev@...r.kernel.org, davem@...emloft.net, edumazet@...gle.com,
        kuba@...nel.org, pabeni@...hat.com, sean.wang@...iatek.com,
        Landen.Chao@...iatek.com, dqfext@...il.com, andrew@...n.ch,
        f.fainelli@...il.com, matthias.bgg@...il.com,
        angelogioacchino.delregno@...labora.com, linux@...linux.org.uk,
        opensource@...rst.com, lynxis@...0.eu, ilya.lipnitskiy@...il.com,
        richard@...terhints.com, frank-w@...lic-files.de,
        erkin.bozoglu@...ont.com, gerg@...nel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, arinc9.unal@...il.com,
        arinc.unal@...nc9.com
Subject: Re: [PATCH net] net: dsa: mt7530: permit port 5 to work without port 6 on
 MT7621 SoC

Hello:

This patch was applied to netdev/net.git (main)
by Jakub Kicinski <kuba@...nel.org>:

On Tue,  7 Mar 2023 17:54:11 +0200 you wrote:
> The MT7530 switch from the MT7621 SoC has 2 ports which can be set up as
> internal: port 5 and 6. Arınç reports that the GMAC1 attached to port 5
> receives corrupted frames, unless port 6 (attached to GMAC0) has been
> brought up by the driver. This is true regardless of whether port 5 is
> used as a user port or as a CPU port (carrying DSA tags).
> 
> Offline debugging (blind for me) which began in the linked thread showed
> experimentally that the configuration done by the driver for port 6
> contains a step which is needed by port 5 as well - the write to
> CORE_GSWPLL_GRP2 (note that I've no idea as to what it does, apart from
> the comment "Set core clock into 500Mhz"). Prints put by Arınç show that
> the reset value of CORE_GSWPLL_GRP2 is RG_GSWPLL_POSDIV_500M(1) |
> RG_GSWPLL_FBKDIV_500M(40) (0x128), both on the MCM MT7530 from the
> MT7621 SoC, as well as on the standalone MT7530 from MT7623NI Bananapi
> BPI-R2. Apparently, port 5 on the standalone MT7530 can work under both
> values of the register, while on the MT7621 SoC it cannot.
> 
> [...]

Here is the summary with links:
  - [net] net: dsa: mt7530: permit port 5 to work without port 6 on MT7621 SoC
    https://git.kernel.org/netdev/net/c/c8b8a3c601f2

You are awesome, thank you!
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