linux-kernel - Re: [PATCH net-next v2 0/2] Add Marvell PHY PTP support

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Message-ID: <Z_P-K7mEEH6ProlC@shell.armlinux.org.uk>
Date: Mon, 7 Apr 2025 17:32:43 +0100
From: "Russell King (Oracle)" <linux@...linux.org.uk>
To: Kory Maincent <kory.maincent@...tlin.com>
Cc: Andrew Lunn <andrew@...n.ch>, Heiner Kallweit <hkallweit1@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Marek Behún <kabel@...nel.org>,
	Richard Cochran <richardcochran@...il.com>,
	Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
	Maxime Chevallier <maxime.chevallier@...tlin.com>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH net-next v2 0/2] Add Marvell PHY PTP support

On Mon, Apr 07, 2025 at 06:20:28PM +0200, Kory Maincent wrote:
> On Mon, 7 Apr 2025 17:02:28 +0100
> "Russell King (Oracle)" <linux@...linux.org.uk> wrote:
> 
> > On Mon, Apr 07, 2025 at 04:02:59PM +0200, Kory Maincent wrote:
> > > Add PTP basic support for Marvell 88E151x PHYs.
> > > 
> > > Signed-off-by: Kory Maincent <kory.maincent@...tlin.com>  
> > 
> > Is the PTP selection stuff actually sorted now? Last time I tested it
> > after it having been merged into the kernel for a while, it didn't work,
> > and I reported that fact. You haven't told me that you now expect it to
> > work.
> 
> The last part of the series, the PTP selection support wasn't merged when you
> tested it, although the default PTP choice that causes your regression was
> merged.
> Now it is fully merged, even the ethtool support.
> https://lore.kernel.org/netdev/mjn6eeo6lestvo6z3utb7aemufmfhn5alecyoaz46dt4pwjn6v@4aaaz6qpqd4b/
> 
> The only issue is the rtln warning from the phy_detach function. About it, I
> have already sent you the work I have done throwing ASSERT_RTNL in phy_detach.
> Maybe I should resend it as RFC.
> 
> > I don't want this merged until such time that we can be sure that MVPP2
> > platforms can continue using the MVPP2 PTP support, which to me means
> > that the PTP selection between a MAC and PHY needs to work.
> 
> It should works, the default PTP will be the MAC PTP and you will be able to
> select the current PTP between MAC and PHY with the following command:
> # ethtool --set-hwtimestamp-cfg eth0 index 0 qualifier precise
> Time stamping configuration for eth0:
> Hardware timestamp provider index: 0
> Hardware timestamp provider qualifier: Precise (IEEE 1588 quality)
> Hardware Transmit Timestamp Mode:
> 	off
> Hardware Receive Filter Mode:
> 	none
> Hardware Flags: none
> # ethtool --set-hwtimestamp-cfg eth0 index 1 qualifier precise
> Time stamping configuration for eth0:
> Hardware timestamp provider index: 1
> Hardware timestamp provider qualifier: Precise (IEEE 1588 quality)
> Hardware Transmit Timestamp Mode:
> 	off
> Hardware Receive Filter Mode:
> 	none
> Hardware Flags: none
> 
> You can list the PTPs with the dump command:
> # ethtool --show-time-stamping "*"
> 
> You will need to stop phc2sys and ptp4l during these change as linuxptp may
> face some issues during the PTP change.

I'm preferring to my emails in connection with:

https://lore.kernel.org/r/ZzTMhGDoi3WcY6MR@shell.armlinux.org.uk

when I tested your work last time, it seemed that what was merged hadn't
even been tested. In the last email, you said you'd look into it, but I
didn't hear anything further. Have the problems I reported been
addressed?

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
FTTP is here! 80Mbps down 10Mbps up. Decent connectivity at last!