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

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Message-ID: <20250705170326.106073-1-biju.das.jz@bp.renesas.com>
Date: Sat,  5 Jul 2025 18:03:24 +0100
From: Biju Das <biju.das.jz@...renesas.com>
To: 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>
Cc: Biju Das <biju.das.jz@...renesas.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: [PATCH net-next] net: stmmac: dwmac-renesas-gbeth: Add PM suspend/resume callbacks

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(+)

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