netdev - Re: [PATCH net-next v2 1/2] net: pcs: xpcs: enable skip xPCS soft reset

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Date:   Fri, 27 Aug 2021 04:03:31 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Wong Vee Khee <vee.khee.wong@...ux.intel.com>
Cc:     Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Jose Abreu <joabreu@...opsys.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Heiner Kallweit <hkallweit1@...il.com>, netdev@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Vladimir Oltean <vladimir.oltean@....com>,
        Voon Weifeng <weifeng.voon@...el.com>,
        Michael Sit Wei Hong <michael.wei.hong.sit@...el.com>
Subject: Re: [PATCH net-next v2 1/2] net: pcs: xpcs: enable skip xPCS soft
 reset

On Fri, Aug 27, 2021 at 07:51:32AM +0800, Wong Vee Khee wrote:
> Unlike any other platforms, Intel AlderLake-S uses Synopsys SerDes where
> all the SerDes PLL configurations are controlled by the xPCS at the BIOS
> level. If the driver perform a xPCS soft reset on initialization, these
> settings will be switched back to the power on reset values.

So you have given up on the idea of calling into the BIOS to do this?
ACPI is too difficult to use? Can you at least copy the code from the
BIOS into the driver? It might then also be possible to fix your
inability to swap link speeds?

	  Andrew