netdev - Re: [PATCH net-next v5 5/7] net: stmmac: Signal to PHY/PCS drivers to keep RX clock on

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Message-ID: <c115735a-d909-4185-82a5-6bcb797f6a60@lunn.ch>
Date: Mon, 4 Mar 2024 14:43:56 +0100
From: Andrew Lunn <andrew@...n.ch>
To: Romain Gantois <romain.gantois@...tlin.com>
Cc: Russell King <linux@...linux.org.uk>,
	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>,
	Alexandre Torgue <alexandre.torgue@...s.st.com>,
	Jose Abreu <joabreu@...opsys.com>,
	Maxime Coquelin <mcoquelin.stm32@...il.com>,
	Clément Léger <clement.leger@...tlin.com>,
	Maxime Chevallier <maxime.chevallier@...tlin.com>,
	Miquel Raynal <miquel.raynal@...tlin.com>,
	Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
	netdev@...r.kernel.org, linux-stm32@...md-mailman.stormreply.com,
	linux-arm-kernel@...ts.infradead.org,
	linux-renesas-soc@...r.kernel.org,
	Clark Wang <xiaoning.wang@....com>
Subject: Re: [PATCH net-next v5 5/7] net: stmmac: Signal to PHY/PCS drivers
 to keep RX clock on

On Fri, Mar 01, 2024 at 04:35:02PM +0100, Romain Gantois wrote:
> There is a reocurring issue with stmmac controllers where the MAC fails to
> initialize its hardware if an RX clock signal isn't provided on the MAC/PHY
> link.
> 
> This causes issues when PHY or PCS devices either go into suspend while
> cutting the RX clock or do not bring the clock signal up early enough for
> the MAC to initialize successfully.
> 
> Set the mac_requires_rxc flag in the stmmac phylink config so that PHY/PCS
> drivers know to keep the RX clock up at all times.
> 
> Reported-by: Clark Wang <xiaoning.wang@....com>
> Link: https://lore.kernel.org/all/20230202081559.3553637-1-xiaoning.wang@nxp.com/
> Reported-by: Clément Léger <clement.leger@...tlin.com>
> Link: https://lore.kernel.org/linux-arm-kernel/20230116103926.276869-4-clement.leger@bootlin.com/
> Suggested-by: Russell King <linux@...linux.org.uk>
> Signed-off-by: Romain Gantois <romain.gantois@...tlin.com>

Reviewed-by: Andrew Lunn <andrew@...n.ch>

    Andrew