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Message-ID:
<TY3PR01MB113467D8E13143E412B119270864CA@TY3PR01MB11346.jpnprd01.prod.outlook.com>
Date: Sun, 6 Jul 2025 09:55:28 +0000
From: Biju Das <biju.das.jz@...renesas.com>
To: Russell King <linux@...linux.org.uk>
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
> -----Original Message-----
> From: Biju Das
> Sent: 06 July 2025 09:45
> Subject: RE: [PATCH net-next] net: stmmac: dwmac-renesas-gbeth: Add PM suspend/resume callbacks
>
> Hi Russell King,
>
> > -----Original Message-----
> > From: Biju Das <biju.das.jz@...renesas.com>
> > Sent: 05 July 2025 21:27
> > Subject: RE: [PATCH net-next] net: stmmac: dwmac-renesas-gbeth: Add PM
> > suspend/resume callbacks
> >
> >
> >
> > > -----Original Message-----
> > > From: Russell King <linux@...linux.org.uk>
> > > Subject: Re: [PATCH net-next] net: stmmac: dwmac-renesas-gbeth: Add
> > > PM suspend/resume callbacks
> > >
> > > On Sat, Jul 05, 2025 at 06:03:24PM +0100, Biju Das 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
> > >
> > > You should also test with the interface configured before
> > > suspend/resume and confirm that it continues working afterwards without being reconfigured.
> >
> > Yes, I confirm it works without reconfiguration.
> >
> > Please see the logs:
> > root@...rc-rzg3e:~# ifconfig
> > eth0: flags=-28605<UP,BROADCAST,RUNNING,MULTICAST,DYNAMIC> mtu 1500
> > inet 192.168.10.7 netmask 255.255.255.0 broadcast 192.168.10.255
> > ether 00:11:22:33:44:55 txqueuelen 1000 (Ethernet)
> > RX packets 35 bytes 2208 (2.1 KiB)
> > RX errors 0 dropped 0 overruns 0 frame 0
> > TX packets 27 bytes 5368 (5.2 KiB)
> > TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
> > device interrupt 20
> >
> > 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=0.866 ms
> > 64 bytes from 192.168.10.1: icmp_seq=2 ttl=64 time=0.900 ms
> > 64 bytes from 192.168.10.1: icmp_seq=3 ttl=64 time=0.938 ms
> > 64 bytes from 192.168.10.1: icmp_seq=4 ttl=64 time=0.929 ms
> > 64 bytes from 192.168.10.1: icmp_seq=5 ttl=64 time=0.890 ms
> > 64 bytes from 192.168.10.1: icmp_seq=6 ttl=64 time=1.02 ms
> > [ 75.812501] PM: suspend entry (deep)
> > [ 75.849939] Filesystems sync: 0.033 seconds
> > [ 75.855680] Freezing user space processes
> > [ 75.861550] Freezing user space processes completed (elapsed 0.001 seconds)
> > [ 75.868559] OOM killer disabled.
> > [ 75.871788] Freezing remaining freezable tasks
> > [ 75.877342] Freezing remaining freezable tasks completed (elapsed 0.001 seconds)
> > [ 75.884724] 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
> > [ 75.939455] renesas-gbeth 15c30000.ethernet eth0: Link is Down
> > [ 75.948464] Disabling non-boot CPUs ...
> > [ 75.952584] psci: CPU3 killed (polled 0 ms)
> > [ 75.957722] psci: CPU2 killed (polled 0 ms)
> > [ 75.963385] psci: CPU1 killed (polled 4 ms)
> > [ 75.967815] Enabling non-boot CPUs ...
> > [ 75.968025] Detected VIPT I-cache on CPU1
> > [ 75.968069] GICv3: CPU1: found redistributor 100 region 0:0x0000000014960000
> > [ 75.968107] CPU1: Booted secondary processor 0x0000000100 [0x412fd050]
> > [ 75.968786] CPU1 is up
> > [ 75.968882] Detected VIPT I-cache on CPU2
> > [ 75.968902] GICv3: CPU2: found redistributor 200 region 0:0x0000000014980000
> > [ 75.968922] CPU2: Booted secondary processor 0x0000000200 [0x412fd050]
> > [ 75.969351] CPU2 is up
> > [ 75.969446] Detected VIPT I-cache on CPU3
> > [ 75.969466] GICv3: CPU3: found redistributor 300 region 0:0x00000000149a0000
> > [ 75.969486] CPU3: Booted secondary processor 0x0000000300 [0x412fd050]
> > [ 75.969980] CPU3 is up
> > [ 75.987181] dwmac4: Master AXI performs fixed burst length
> > [ 75.988097] renesas-gbeth 15c30000.ethernet eth0: No Safety Features support found
> > [ 75.988117] renesas-gbeth 15c30000.ethernet eth0: IEEE 1588-2008 Advanced Timestamp supported
> > [ 75.991717] renesas-gbeth 15c30000.ethernet eth0: configuring for phy/rgmii-id link mode
> > [ 76.007851] dwmac4: Master AXI performs fixed burst length
> > [ 76.008761] renesas-gbeth 15c40000.ethernet eth1: No Safety Features support found
> > [ 76.008777] renesas-gbeth 15c40000.ethernet eth1: IEEE 1588-2008 Advanced Timestamp supported
> > [ 76.012353] renesas-gbeth 15c40000.ethernet eth1: configuring for phy/rgmii-id link mode
> > [ 76.204477] OOM killer enabled.
> > [ 76.207609] Restarting tasks: Starting
> > [ 76.212024] Restarting tasks: Done
> > [ 76.215550] random: crng reseeded on system resumption
> > [ 76.220909] PM: suspend exit
> > [ 78.612495] renesas-gbeth 15c30000.ethernet eth0: Link is Up - 1Gbps/Full - flow control rx/tx
> > From 192.168.10.7 icmp_seq=7 Destination Host Unreachable From
> > 192.168.10.7 icmp_seq=8 Destination Host Unreachable From 192.168.10.7
> > icmp_seq=9 Destination Host Unreachable
> > 64 bytes from 192.168.10.1: icmp_seq=11 ttl=64 time=0.663 ms
> > 64 bytes from 192.168.10.1: icmp_seq=12 ttl=64 time=1.19 ms
> >
>
> FYI, The above testing is done with rootFS mounted on SD card.
>
> But when I mount rootFS on NFS, after wakeup, I am not able to contact the NFS server.
>
> The below patch makes it to work[1].
> Not sure, why the original code is failing if the rootFS is mounted on NFS?
>
> Cheers,
> Biju
>
> [1]
> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-renesas-gbeth.c
> b/drivers/net/ethernet/stmicro/stmmac/dwmac-renesas-gbeth.c
> index df4ca897a60c..434ef1802195 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/dwmac-renesas-gbeth.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-renesas-gbeth.c
> @@ -25,6 +25,8 @@ struct renesas_gbeth {
> struct plat_stmmacenet_data *plat_dat;
> struct reset_control *rstc;
> struct device *dev;
> +
> + bool suspend;
> };
>
> static const char *const renesas_gbeth_clks[] = { @@ -50,6 +52,13 @@ static int
> renesas_gbeth_init(struct platform_device *pdev, void *priv)
> if (ret)
> reset_control_assert(gbeth->rstc);
>
> + if (gbeth->suspend) {
> + struct net_device *ndev = platform_get_drvdata(pdev);
> +
> + gbeth->suspend = false;
> + phy_init_hw(ndev->phydev);
> + }
> +
> return ret;
> }
>
> @@ -66,6 +75,8 @@ static void renesas_gbeth_exit(struct platform_device *pdev, void *priv)
> ret = reset_control_assert(gbeth->rstc);
> if (ret)
> dev_err(gbeth->dev, "Reset assert failed\n");
> +
> + gbeth->suspend = true;
> }
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
With patch[1], there is only one kszphy_resume() call.
1) Detailed logs working case RootFS mounted on SD:
root@...rc-rzg3e:~# [ 35.599061] PM: suspend entry (deep)
[ 35.635942] Filesystems sync: 0.033 seconds
[ 35.642070] Freezing user space processes
[ 35.647741] Freezing user space processes completed (elapsed 0.001 seconds)
[ 35.654826] OOM killer disabled.
[ 35.658042] Freezing remaining freezable tasks
[ 35.663649] Freezing remaining freezable tasks completed (elapsed 0.001 seconds)
[ 35.671047] 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
[ 35.722047] libphy: #######phy_suspend 1908
[ 35.722082] ########kszphy_suspend 2350
[ 35.722142] renesas-gbeth 15c30000.ethernet eth0: Link is Down
[ 35.722823] ########kszphy_suspend 2356
[ 35.723183] ########kszphy_generic_suspend 2343
[ 35.723215] libphy: #######phy_suspend 1925
[ 35.730939] Disabling non-boot CPUs ...
[ 35.734909] psci: CPU3 killed (polled 4 ms)
[ 35.741526] psci: CPU2 killed (polled 0 ms)
[ 35.746911] psci: CPU1 killed (polled 4 ms)
[ 35.749344] Enabling non-boot CPUs ...
[ 35.749557] Detected VIPT I-cache on CPU1
[ 35.749601] GICv3: CPU1: found redistributor 100 region 0:0x0000000014960000
[ 35.749639] CPU1: Booted secondary processor 0x0000000100 [0x412fd050]
[ 35.750293] CPU1 is up
[ 35.750385] Detected VIPT I-cache on CPU2
[ 35.750406] GICv3: CPU2: found redistributor 200 region 0:0x0000000014980000
[ 35.750427] CPU2: Booted secondary processor 0x0000000200 [0x412fd050]
[ 35.750879] CPU2 is up
[ 35.750973] Detected VIPT I-cache on CPU3
[ 35.750993] GICv3: CPU3: found redistributor 300 region 0:0x00000000149a0000
[ 35.751015] CPU3: Booted secondary processor 0x0000000300 [0x412fd050]
[ 35.751483] CPU3 is up
[ 35.754875] ########kszphy_resume 2389
[ 35.754887] CPU: 1 UID: 0 PID: 281 Comm: systemd-sleep Not tainted 6.16.0-rc4-next-20250703-gf2ebaf5365aa-dirty #63 PREEMPT
[ 35.754895] Hardware name: Renesas SMARC EVK version 2 based on r9a09g047e57 (DT)
[ 35.754898] Call trace:
[ 35.754902] show_stack+0x18/0x24 (C)
[ 35.754917] dump_stack_lvl+0x78/0x90
[ 35.754927] dump_stack+0x18/0x24
[ 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
[ 35.754967] stmmac_pltfr_resume+0x3c/0x4c
[ 35.754974] device_resume+0x108/0x1ec
[ 35.754983] dpm_resume+0x198/0x1b8
[ 35.754990] dpm_resume_end+0x20/0x38
[ 35.754996] suspend_devices_and_enter+0x4a8/0x58c
[ 35.755006] pm_suspend+0x180/0x20c
[ 35.755011] state_store+0x80/0xec
[ 35.755017] kobj_attr_store+0x18/0x2c
[ 35.755023] sysfs_kf_write+0x7c/0x94
[ 35.755031] kernfs_fop_write_iter+0x120/0x1ec
[ 35.755037] vfs_write+0x238/0x370
[ 35.755045] ksys_write+0x6c/0x100
[ 35.755051] __arm64_sys_write+0x1c/0x28
[ 35.755056] invoke_syscall+0x48/0x110
[ 35.755065] el0_svc_common.constprop.0+0xc0/0xe0
[ 35.755072] do_el0_svc+0x1c/0x28
[ 35.755078] el0_svc+0x34/0xf0
[ 35.755086] el0t_64_sync_handler+0xa0/0xe4
[ 35.755093] el0t_64_sync+0x198/0x19c
[ 35.755099] ########kszphy_generic_resume 2328
[ 35.757673] ########kszphy_resume 2413
[ 35.766674] dwmac4: Master AXI performs fixed burst length
[ 35.767591] renesas-gbeth 15c30000.ethernet eth0: No Safety Features support found
[ 35.767611] renesas-gbeth 15c30000.ethernet eth0: IEEE 1588-2008 Advanced Timestamp supported
[ 35.771205] renesas-gbeth 15c30000.ethernet eth0: configuring for phy/rgmii-id link mode
[ 35.771221] ########kszphy_resume 2389
[ 35.771227] CPU: 1 UID: 0 PID: 281 Comm: systemd-sleep Not tainted 6.16.0-rc4-next-20250703-gf2ebaf5365aa-dirty #63 PREEMPT
[ 35.771234] Hardware name: Renesas SMARC EVK version 2 based on r9a09g047e57 (DT)
[ 35.771236] Call trace:
[ 35.771238] show_stack+0x18/0x24 (C)
[ 35.771245] dump_stack_lvl+0x78/0x90
[ 35.771252] dump_stack+0x18/0x24
[ 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
[ 35.771303] device_resume+0x108/0x1ec
[ 35.771309] dpm_resume+0x198/0x1b8
[ 35.771316] dpm_resume_end+0x20/0x38
[ 35.771322] suspend_devices_and_enter+0x4a8/0x58c
[ 35.771329] pm_suspend+0x180/0x20c
[ 35.771334] state_store+0x80/0xec
[ 35.771340] kobj_attr_store+0x18/0x2c
[ 35.771345] sysfs_kf_write+0x7c/0x94
[ 35.771351] kernfs_fop_write_iter+0x120/0x1ec
[ 35.771356] vfs_write+0x238/0x370
[ 35.771363] ksys_write+0x6c/0x100
[ 35.771368] __arm64_sys_write+0x1c/0x28
[ 35.771374] invoke_syscall+0x48/0x110
[ 35.771381] el0_svc_common.constprop.0+0xc0/0xe0
[ 35.771388] do_el0_svc+0x1c/0x28
[ 35.771394] el0_svc+0x34/0xf0
[ 35.771401] el0t_64_sync_handler+0xa0/0xe4
[ 35.771407] el0t_64_sync+0x198/0x19c
[ 35.771412] ########kszphy_generic_resume 2328
[ 35.773979] ########kszphy_resume 2413
[ 36.018701] SDHI2-VQMMC: disabling
[ 36.228208] OOM killer enabled.
[ 36.231349] Restarting tasks: Starting
[ 36.235635] Restarting tasks: Done
[ 36.239154] random: crng reseeded on system resumption
[ 36.244473] PM: suspend exit
root@...rc-rzg3e:~# [ 38.520643] renesas-gbeth 15c30000.ethernet eth0: Link is Up - 1Gbps/Full - flow control rx/tx
2) Detailed logs NON working case RootFS mounted on NFS:
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
[ 21.156070] libphy: #######phy_suspend 1908
[ 21.156109] ########kszphy_suspend 2350
[ 21.156161] renesas-gbeth 15c30000.ethernet eth0: Link is Down
[ 21.156788] ########kszphy_suspend 2356
[ 21.157144] ########kszphy_generic_suspend 2343
[ 21.157174] libphy: #######phy_suspend 1925
[ 21.165512] Disabling non-boot CPUs ...
[ 21.169679] psci: CPU3 killed (polled 4 ms)
[ 21.180952] psci: CPU2 killed (polled 0 ms)
[ 21.188027] psci: CPU1 killed (polled 0 ms)
[ 21.190677] Enabling non-boot CPUs ...
[ 21.190883] Detected VIPT I-cache on CPU1
[ 21.190929] GICv3: CPU1: found redistributor 100 region 0:0x0000000014960000
[ 21.190967] CPU1: Booted secondary processor 0x0000000100 [0x412fd050]
[ 21.191653] CPU1 is up
[ 21.191748] Detected VIPT I-cache on CPU2
[ 21.191769] GICv3: CPU2: found redistributor 200 region 0:0x0000000014980000
[ 21.191789] CPU2: Booted secondary processor 0x0000000200 [0x412fd050]
[ 21.192225] CPU2 is up
[ 21.192321] Detected VIPT I-cache on CPU3
[ 21.192341] GICv3: CPU3: found redistributor 300 region 0:0x00000000149a0000
[ 21.192362] CPU3: Booted secondary processor 0x0000000300 [0x412fd050]
[ 21.192879] CPU3 is up
[ 21.197553] ########kszphy_resume 2389
[ 21.197566] CPU: 3 UID: 0 PID: 288 Comm: systemd-sleep Not tainted 6.16.0-rc4-next-20250703-gf2ebaf5365aa-dirty #63 PREEMPT
[ 21.197574] Hardware name: Renesas SMARC EVK version 2 based on r9a09g047e57 (DT)
[ 21.197578] Call trace:
[ 21.197581] show_stack+0x18/0x24 (C)
[ 21.197595] dump_stack_lvl+0x78/0x90
[ 21.197606] dump_stack+0x18/0x24
[ 21.197612] kszphy_resume+0x3c/0xf0
[ 21.197619] phy_resume+0x3c/0x74
[ 21.197628] phylink_prepare_resume+0x58/0xa0
[ 21.197636] stmmac_resume+0x90/0x2a0
[ 21.197646] stmmac_pltfr_resume+0x3c/0x4c
[ 21.197653] device_resume+0x108/0x1ec
[ 21.197663] dpm_resume+0x198/0x1b8
[ 21.197669] dpm_resume_end+0x20/0x38
[ 21.197675] suspend_devices_and_enter+0x4a8/0x58c
[ 21.197684] pm_suspend+0x180/0x20c
[ 21.197689] state_store+0x80/0xec
[ 21.197695] kobj_attr_store+0x18/0x2c
[ 21.197702] sysfs_kf_write+0x7c/0x94
[ 21.197709] kernfs_fop_write_iter+0x120/0x1ec
[ 21.197714] vfs_write+0x238/0x370
[ 21.197723] ksys_write+0x6c/0x100
[ 21.197729] __arm64_sys_write+0x1c/0x28
[ 21.197735] invoke_syscall+0x48/0x110
[ 21.197743] el0_svc_common.constprop.0+0xc0/0xe0
[ 21.197749] do_el0_svc+0x1c/0x28
[ 21.197756] el0_svc+0x34/0xf0
[ 21.197763] el0t_64_sync_handler+0xa0/0xe4
[ 21.197770] el0t_64_sync+0x198/0x19c
[ 21.197776] ########kszphy_generic_resume 2328
[ 21.200350] ########kszphy_resume 2413
[ 21.209338] dwmac4: Master AXI performs fixed burst length
[ 21.210253] renesas-gbeth 15c30000.ethernet eth0: No Safety Features support found
[ 21.210273] renesas-gbeth 15c30000.ethernet eth0: IEEE 1588-2008 Advanced Timestamp supported
[ 21.213870] renesas-gbeth 15c30000.ethernet eth0: configuring for phy/rgmii-id link mode
[ 21.213886] ########kszphy_resume 2389
[ 21.213891] CPU: 3 UID: 0 PID: 288 Comm: systemd-sleep Not tainted 6.16.0-rc4-next-20250703-gf2ebaf5365aa-dirty #63 PREEMPT
[ 21.213897] Hardware name: Renesas SMARC EVK version 2 based on r9a09g047e57 (DT)
[ 21.213900] Call trace:
[ 21.213902] show_stack+0x18/0x24 (C)
[ 21.213909] dump_stack_lvl+0x78/0x90
[ 21.213917] dump_stack+0x18/0x24
[ 21.213922] kszphy_resume+0x3c/0xf0
[ 21.213928] __phy_resume+0x28/0x54
[ 21.213935] phy_start+0x7c/0xb4
[ 21.213940] phylink_start+0xb8/0x210
[ 21.213948] phylink_resume+0x7c/0xc4
[ 21.213955] stmmac_resume+0x1ec/0x2a0
[ 21.213962] stmmac_pltfr_resume+0x3c/0x4c
[ 21.213969] device_resume+0x108/0x1ec
[ 21.213976] dpm_resume+0x198/0x1b8
[ 21.213982] dpm_resume_end+0x20/0x38
[ 21.213988] suspend_devices_and_enter+0x4a8/0x58c
[ 21.213995] pm_suspend+0x180/0x20c
[ 21.214001] state_store+0x80/0xec
[ 21.214006] kobj_attr_store+0x18/0x2c
[ 21.214011] sysfs_kf_write+0x7c/0x94
[ 21.214018] kernfs_fop_write_iter+0x120/0x1ec
[ 21.214023] vfs_write+0x238/0x370
[ 21.214030] ksys_write+0x6c/0x100
[ 21.214035] __arm64_sys_write+0x1c/0x28
[ 21.214041] invoke_syscall+0x48/0x110
[ 21.214048] el0_svc_common.constprop.0+0xc0/0xe0
[ 21.214055] do_el0_svc+0x1c/0x28
[ 21.214062] el0_svc+0x34/0xf0
[ 21.214068] el0t_64_sync_handler+0xa0/0xe4
[ 21.214074] el0t_64_sync+0x198/0x19c
[ 21.214080] ########kszphy_generic_resume 2328
[ 21.216646] ########kszphy_resume 2413
[ 22.661587] OOM killer enabled.
[ 22.668623] Restarting tasks: Starting
[ 22.673694] Restarting tasks: Done
[ 22.677226] random: crng reseeded on system resumption
[ 22.682799] PM: suspend exit
root@...rc-rzg3e:~# [ 23.801866] renesas-gbeth 15c30000.ethernet eth0: Link is Up - 1Gbps/Full - flow control rx/tx
3) Detailed logs working case RootFS mounted on NFS with patch[1] above:
root@...rc-rzg3e:~# [ 20.859463] PM: suspend entry (deep)
[ 20.863297] Filesystems sync: 0.000 seconds
[ 20.870616] Freezing user space processes
[ 20.876719] Freezing user space processes completed (elapsed 0.001 seconds)
[ 20.883685] OOM killer disabled.
[ 20.886912] Freezing remaining freezable tasks
[ 20.892475] Freezing remaining freezable tasks completed (elapsed 0.001 seconds)
[ 20.899863] 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
[ 20.953817] libphy: #######phy_suspend 1908
[ 20.953853] ########kszphy_suspend 2350
[ 20.953912] renesas-gbeth 15c30000.ethernet eth0: Link is Down
[ 20.954530] ########kszphy_suspend 2356
[ 20.954880] ########kszphy_generic_suspend 2343
[ 20.954911] libphy: #######phy_suspend 1925
[ 20.963329] Disabling non-boot CPUs ...
[ 20.967649] psci: CPU3 killed (polled 0 ms)
[ 20.975948] psci: CPU2 killed (polled 0 ms)
[ 20.984986] psci: CPU1 killed (polled 0 ms)
[ 20.990162] Enabling non-boot CPUs ...
[ 20.990375] Detected VIPT I-cache on CPU1
[ 20.990419] GICv3: CPU1: found redistributor 100 region 0:0x0000000014960000
[ 20.990456] CPU1: Booted secondary processor 0x0000000100 [0x412fd050]
[ 20.991154] CPU1 is up
[ 20.991248] Detected VIPT I-cache on CPU2
[ 20.991269] GICv3: CPU2: found redistributor 200 region 0:0x0000000014980000
[ 20.991289] CPU2: Booted secondary processor 0x0000000200 [0x412fd050]
[ 20.991736] CPU2 is up
[ 20.991833] Detected VIPT I-cache on CPU3
[ 20.991854] GICv3: CPU3: found redistributor 300 region 0:0x00000000149a0000
[ 20.991875] CPU3: Booted secondary processor 0x0000000300 [0x412fd050]
[ 20.992378] CPU3 is up
[ 21.068746] dwmac4: Master AXI performs fixed burst length
[ 21.069681] renesas-gbeth 15c30000.ethernet eth0: No Safety Features support found
[ 21.069701] renesas-gbeth 15c30000.ethernet eth0: IEEE 1588-2008 Advanced Timestamp supported
[ 21.073298] renesas-gbeth 15c30000.ethernet eth0: configuring for phy/rgmii-id link mode
[ 21.073315] ########kszphy_resume 2389
[ 21.073325] CPU: 1 UID: 0 PID: 285 Comm: systemd-sleep Not tainted 6.16.0-rc4-next-20250703-gf2ebaf5365aa-dirty #64 PREEMPT
[ 21.073332] Hardware name: Renesas SMARC EVK version 2 based on r9a09g047e57 (DT)
[ 21.073336] Call trace:
[ 21.073340] show_stack+0x18/0x24 (C)
[ 21.073354] dump_stack_lvl+0x78/0x90
[ 21.073364] dump_stack+0x18/0x24
[ 21.073370] kszphy_resume+0x3c/0xf0
[ 21.073377] __phy_resume+0x28/0x54
[ 21.073385] phy_start+0x7c/0xb4
[ 21.073390] phylink_start+0xb8/0x210
[ 21.073398] phylink_resume+0x7c/0xc4
[ 21.073404] stmmac_resume+0x1ec/0x2a0
[ 21.073413] stmmac_pltfr_resume+0x3c/0x4c
[ 21.073420] device_resume+0x108/0x1ec
[ 21.073429] dpm_resume+0x198/0x1b8
[ 21.073435] dpm_resume_end+0x20/0x38
[ 21.073441] suspend_devices_and_enter+0x4a8/0x58c
[ 21.073450] pm_suspend+0x180/0x20c
[ 21.073456] state_store+0x80/0xec
[ 21.073462] kobj_attr_store+0x18/0x2c
[ 21.073469] sysfs_kf_write+0x7c/0x94
[ 21.073476] kernfs_fop_write_iter+0x120/0x1ec
[ 21.073481] vfs_write+0x238/0x370
[ 21.073489] ksys_write+0x6c/0x100
[ 21.073496] __arm64_sys_write+0x1c/0x28
[ 21.073502] invoke_syscall+0x48/0x110
[ 21.073510] el0_svc_common.constprop.0+0xc0/0xe0
[ 21.073517] do_el0_svc+0x1c/0x28
[ 21.073523] el0_svc+0x34/0xf0
[ 21.073531] el0t_64_sync_handler+0xa0/0xe4
[ 21.073537] el0t_64_sync+0x198/0x19c
[ 21.073543] ########kszphy_generic_resume 2328
[ 21.076110] ########kszphy_resume 2413
[ 22.393352] OOM killer enabled.
[ 22.400389] Restarting tasks: Starting
[ 22.405808] Restarting tasks: Done
[ 22.409360] random: crng reseeded on system resumption
[ 22.414809] PM: suspend exit
root@...rc-rzg3e:~# [ 23.786523] renesas-gbeth 15c30000.ethernet eth0: Link is Up - 1Gbps/Full - flow control rx/tx
[ 24.929734] 8021q: 802.1Q VLAN Support v1.8
[ 24.934021] 8021q: adding VLAN 0 to HW filter on device eth0
Cheers,
Biju
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