linux-kernel - Re: [PATCH net-next 1/2] net: pcs: xpcs: enable skip xPCS soft reset

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Date:   Wed, 11 Aug 2021 16:20:56 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     Wong Vee Khee <vee.khee.wong@...ux.intel.com>,
        Vivien Didelot <vivien.didelot@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Jose Abreu <joabreu@...opsys.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Voon Weifeng <weifeng.voon@...el.com>,
        Michael Sit Wei Hong <michael.wei.hong.sit@...el.com>,
        Vladimir Oltean <olteanv@...il.com>,
        linux-arm-kernel@...ts.infradead.org,
        linux-stm32@...md-mailman.stormreply.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 1/2] net: pcs: xpcs: enable skip xPCS soft reset

> > BIOS does configured the SerDes. The problem here is that all the
> > configurations done by BIOS are being reset at xpcs_create().
> > 
> > We would want user of the pcs-xpcs module (stmmac, sja1105) to have
> > control whether or not we need to perform to the soft reset in the
> > xpcs_create() call.
> 
> I understood Andrew's response as suggesting to introduce the ability for
> xpcs_create() to make a BIOS call which would configure the SerDes after
> xpcs_soft_reset().

Yes. Exactly. That is what ACPI is for, so we should use it for this.

     Andrew