linux-kernel - Re: [PATCH net v3] net: phy: intel-xway: enable integrated led functions

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

Message-ID: <YgRWl5ykcjPW0xvx@lunn.ch>
Date:   Thu, 10 Feb 2022 01:04:39 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Tim Harvey <tharvey@...eworks.com>
Cc:     Martin Schiller <ms@....tdt.de>, Hauke Mehrtens <hauke@...ke-m.de>,
        martin.blumenstingl@...glemail.com,
        Florian Fainelli <f.fainelli@...il.com>, hkallweit1@...il.com,
        Russell King - ARM Linux <linux@...linux.org.uk>,
        David Miller <davem@...emloft.net>, kuba@...nel.org,
        netdev <netdev@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net v3] net: phy: intel-xway: enable integrated led
 functions

> The errata can be summarized as:
> - 1 out of 100 boots or cable plug events RGMII GbE link will end up
> going down and up 3 to 4 times then resort to a 100m link; workaround
> has been found to require a pin level reset

So that sounds like it is downshifting because it thinks there is a
broken pair. Can you disable downshift? Problem is, that might just
result in link down.

> - 1 out of 100 boots or cable plug events (varies per board) SGMII
> will fail link between the MAC and PHY; workaround has been found to
> require a pin level reset

I don't suppose there is a register to restart SGMII sync?  Sometimes
there is.

Anyway, shared reset makes this messy, as you said. Unfortunate
design. But i don't see how you can work around this in the
bootloader, especially the cable plug events.

	Andrew