netdev - Re: [PATCH net-next] net: phy: swphy: Support all normal speeds when link down

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Date:   Mon, 5 Dec 2022 17:44:19 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     "Russell King (Oracle)" <linux@...linux.org.uk>
Cc:     netdev <netdev@...r.kernel.org>,
        Sean Anderson <sean.anderson@...o.com>,
        Heiner Kallweit <hkallweit1@...il.com>
Subject: Re: [PATCH net-next] net: phy: swphy: Support all normal speeds when
 link down

On Mon, Dec 05, 2022 at 04:04:21PM +0000, Russell King (Oracle) wrote:
> On Sun, Dec 04, 2022 at 06:41:03PM +0100, Andrew Lunn wrote:
> > The software PHY emulator validation function is happy to accept any
> > link speed if the link is down. swphy_read_reg() however triggers a
> > WARN_ON(). Change this to report all the standard 1G link speeds are
> > supported. Once the speed is known the supported link modes will
> > change, which is a bit odd, but for emulation is probably O.K.
> > 
> > Suggested-by: Russell King (Oracle) <linux@...linux.org.uk>
> 
> This isn't what I suggested. I suggested restoring the old behaviour of
> fixed_phy before commit 5ae68b0ce134 ("phy: move fixed_phy MII register
> generation to a library") which did _not_ report all speeds, but
> reported no supported speeds in BMSR.

O.K.

Which is better. No speeds, or all speeds? I think all speeds is more
like what a real PHY does.

     Andrew