linux-kernel - Re: [PATCH net-next] net: stmmac: dwmac-renesas-gbeth: Add PM suspend/resume callbacks

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Message-ID: <CA+V-a8tZKMfDjxmrkTJhN+=WoGBR0711yoZYgQWDKd361f9q_A@mail.gmail.com>
Date: Wed, 16 Jul 2025 20:26:23 +0100
From: "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To: Biju Das <biju.das.jz@...renesas.com>
Cc: Lad Prabhakar <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, linux-renesas-soc@...r.kernel.org, 
	linux-stm32@...md-mailman.stormreply.com, 
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, 
	Geert Uytterhoeven <geert+renesas@...der.be>, Biju Das <biju.das.au@...il.com>
Subject: Re: [PATCH net-next] net: stmmac: dwmac-renesas-gbeth: Add PM
 suspend/resume callbacks

On Sat, Jul 5, 2025 at 6:03 PM Biju Das <biju.das.jz@...renesas.com> wrote:
>
> Add PM suspend/resume callbacks for RZ/G3E SMARC EVK.
>
> The PM deep entry is executed by pressing the SLEEP button and exit from
> entry is by pressing the power button.
>
> Logs:
> root@...rc-rzg3e:~# PM: suspend entry (deep)
> Filesystems sync: 0.115 seconds
> Freezing user space processes
> Freezing user space processes completed (elapsed 0.002 seconds)
> OOM killer disabled.
> Freezing remaining freezable tasks
> Freezing remaining freezable tasks completed (elapsed 0.001 seconds)
> printk: Suspending console(s) (use no_console_suspend to debug)
> NOTICE:  BL2: v2.10.5(release):2.10.5/rz_soc_dev-162-g7148ba838
> NOTICE:  BL2: Built : 14:23:58, Jul  5 2025
> NOTICE:  BL2: SYS_LSI_MODE: 0x13e06
> NOTICE:  BL2: SYS_LSI_DEVID: 0x8679447
> NOTICE:  BL2: SYS_LSI_PRR: 0x0
> NOTICE:  BL2: Booting BL31
> renesas-gbeth 15c30000.ethernet end0: Link is Down
> Disabling non-boot CPUs ...
> psci: CPU3 killed (polled 0 ms)
> psci: CPU2 killed (polled 0 ms)
> psci: CPU1 killed (polled 0 ms)
> Enabling non-boot CPUs ...
> Detected VIPT I-cache on CPU1
> GICv3: CPU1: found redistributor 100 region 0:0x0000000014960000
> CPU1: Booted secondary processor 0x0000000100 [0x412fd050]
> CPU1 is up
> Detected VIPT I-cache on CPU2
> GICv3: CPU2: found redistributor 200 region 0:0x0000000014980000
> CPU2: Booted secondary processor 0x0000000200 [0x412fd050]
> CPU2 is up
> Detected VIPT I-cache on CPU3
> GICv3: CPU3: found redistributor 300 region 0:0x00000000149a0000
> CPU3: Booted secondary processor 0x0000000300 [0x412fd050]
> CPU3 is up
> dwmac4: Master AXI performs fixed burst length
> 15c30000.ethernet end0: No Safety Features support found
> 15c30000.ethernet end0: IEEE 1588-2008 Advanced Timestamp supported
> 15c30000.ethernet end0: configuring for phy/rgmii-id link mode
> dwmac4: Master AXI performs fixed burst length
> 15c40000.ethernet end1: No Safety Features support found
> 15c40000.ethernet end1: IEEE 1588-2008 Advanced Timestamp supported
> 15c40000.ethernet end1: configuring for phy/rgmii-id link mode
> OOM killer enabled.
> Restarting tasks: Starting
> Restarting tasks: Done
> random: crng reseeded on system resumption
> PM: suspend exit
>
> 15c30000.ethernet end0: Link is Up - 1Gbps/Full - flow control rx/tx
> root@...rc-rzg3e:~# ifconfig end0 192.168.10.7 up
> root@...rc-rzg3e:~# ping 192.168.10.1
> PING 192.168.10.1 (192.168.10.1) 56(84) bytes of data.
> 64 bytes from 192.168.10.1: icmp_seq=1 ttl=64 time=2.05 ms
> 64 bytes from 192.168.10.1: icmp_seq=2 ttl=64 time=0.928 ms
>
> Signed-off-by: Biju Das <biju.das.jz@...renesas.com>
> ---
> This patch is tested with out-of tree patch for save/restore
> ethernet OEN registers in the pinctrl block.
> ---
>  drivers/net/ethernet/stmicro/stmmac/dwmac-renesas-gbeth.c | 1 +
>  1 file changed, 1 insertion(+)
>
Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>

Cheers,
Prabhakar

> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-renesas-gbeth.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-renesas-gbeth.c
> index 9a774046455b..df4ca897a60c 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/dwmac-renesas-gbeth.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-renesas-gbeth.c
> @@ -136,6 +136,7 @@ static struct platform_driver renesas_gbeth_driver = {
>         .probe  = renesas_gbeth_probe,
>         .driver = {
>                 .name           = "renesas-gbeth",
> +               .pm             = &stmmac_pltfr_pm_ops,
>                 .of_match_table = renesas_gbeth_match,
>         },
>  };
> --
> 2.43.0
>
>