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Message-ID: <aGpLpLDPdcPByC7j@shell.armlinux.org.uk>
Date: Sun, 6 Jul 2025 11:10:44 +0100
From: "Russell King (Oracle)" <linux@...linux.org.uk>
To: Biju Das <biju.das.jz@...renesas.com>
Cc: Prabhakar Mahadev Lad <prabhakar.mahadev-lad.rj@...renesas.com>,
Andrew Lunn <andrew+netdev@...n.ch>,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
Maxime Coquelin <mcoquelin.stm32@...il.com>,
Alexandre Torgue <alexandre.torgue@...s.st.com>,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
"linux-renesas-soc@...r.kernel.org" <linux-renesas-soc@...r.kernel.org>,
"linux-stm32@...md-mailman.stormreply.com" <linux-stm32@...md-mailman.stormreply.com>,
"linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
Geert Uytterhoeven <geert+renesas@...der.be>,
"biju.das.au" <biju.das.au@...il.com>
Subject: Re: [PATCH net-next] net: stmmac: dwmac-renesas-gbeth: Add PM
suspend/resume callbacks
On Sun, Jul 06, 2025 at 09:55:28AM +0000, Biju Das wrote:
> Just adding some logs:
> Currently PHY resume is called twice
> [ 35.754933] kszphy_resume+0x3c/0xf0
> [ 35.754940] phy_resume+0x3c/0x74
> [ 35.754949] phylink_prepare_resume+0x58/0xa0
> [ 35.754957] stmmac_resume+0x90/0x2a0
> [ 35.771296] stmmac_pltfr_resume+0x3c/0x4c
>
> and
>
> [ 35.771258] kszphy_resume+0x3c/0xf0
> [ 35.771263] __phy_resume+0x28/0x54
> [ 35.771270] phy_start+0x7c/0xb4
> [ 35.771275] phylink_start+0xb8/0x210
> [ 35.771282] phylink_resume+0x7c/0xc4
> [ 35.771288] stmmac_resume+0x1ec/0x2a0
> [ 35.771296] stmmac_pltfr_resume+0x3c/0x4c
This shouldn't be a problem. Phylib will do this, and PHY drivers are
expected to cope.
For example, on non-MAC managed PM PHYs, mdio_bus_phy_resume() will
call phy_init_hw() followed by phy_resume(). If a MAC subsequently is
brought up, phy_start() will be called, which will also call
__phy_resume().
If this is upsetting the KSZ PHY, then the KSZ PHY driver needs fixing.
--
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