linux-kernel - Re: [PATCH 2/2] net: dsa: microchip: Provide Module 4 KSZ9477 errata (DS80000754C)

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Message-ID: <20230826104910.voaw3ndvs52yoy2v@skbuf>
Date:   Sat, 26 Aug 2023 13:49:10 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     Tristram.Ha@...rochip.com
Cc:     f.fainelli@...il.com, andrew@...n.ch, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, Woojung.Huh@...rochip.com,
        pabeni@...hat.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, UNGLinuxDriver@...rochip.com,
        lukma@...x.de
Subject: Re: [PATCH 2/2] net: dsa: microchip: Provide Module 4 KSZ9477 errata
 (DS80000754C)

On Fri, Aug 25, 2023 at 06:48:41PM +0000, Tristram.Ha@...rochip.com wrote:
> > > IMHO adding functions to MMD modification would facilitate further
> > > development (for example LED setup).
> > 
> > We already have some KSZ9477 specific initialization done in the Micrel
> > PHY driver under drivers/net/phy/micrel.c, can we converge on the PHY
> > driver which has a reasonable amount of infrastructure for dealing with
> > workarounds, indirect or direct MMD accesses etc.?
> 
> Actually the internal PHY used in the KSZ9897/KSZ9477/KSZ9893 switches
> are special and only used inside those switches.  Putting all the switch
> related code in Micrel PHY driver does not really help.  When the switch
> is reset all those PHY registers need to be set again, but the PHY driver
> only executes those code during PHY initialization.  I do not know if
> there is a good way to tell the PHY to re-initialize again.

Suppose there was a method to tell the PHY driver to re-initialize itself.
What would be the key points in which the DSA switch driver would need
to trigger that method? Where is the switch reset at runtime?