Date:   Wed, 9 Jun 2021 14:46:09 +0200
From:   Oleksij Rempel <o.rempel@...gutronix.de>
To:     Marek Szyprowski <m.szyprowski@...sung.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>, kernel@...gutronix.de,
        linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
        netdev@...r.kernel.org
Subject: Re: [PATCH net-next v2 4/8] net: usb: asix: ax88772: add phylib
 support

Hi Marek,

On Wed, Jun 09, 2021 at 11:59:23AM +0200, Marek Szyprowski wrote:
> Hi Oleksij,
> 
> On 07.06.2021 10:27, Oleksij Rempel wrote:
> > To be able to use ax88772 with external PHYs and use advantage of
> > existing PHY drivers, we need to port at least ax88772 part of asix
> > driver to the phylib framework.
> >
> > Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>
> 
> This patch landed recently in linux-next as commit e532a096be0e ("net: 
> usb: asix: ax88772: add phylib support"). I found that it causes some 
> warnings on boards with those devices, see the following log:
> 
> root@...get:~# time rtcwake -s10 -mmem
> rtcwake: wakeup from "mem" using /dev/rtc0 at Wed Jun  9 08:16:41 2021
> [  231.226579] PM: suspend entry (deep)
> [  231.231697] Filesystems sync: 0.002 seconds
> [  231.261761] Freezing user space processes ... (elapsed 0.002 seconds) 
> done.
> [  231.270526] OOM killer disabled.
> [  231.273557] Freezing remaining freezable tasks ... (elapsed 0.002 
> seconds) done.
> [  231.282229] printk: Suspending console(s) (use no_console_suspend to 
> debug)
> ...
> [  231.710852] Disabling non-boot CPUs ...
> ...
> [  231.901794] Enabling non-boot CPUs ...
> ...
> [  232.225640] usb usb3: root hub lost power or was reset
> [  232.225746] usb usb1: root hub lost power or was reset
> [  232.225864] usb usb5: root hub lost power or was reset
> [  232.226206] usb usb6: root hub lost power or was reset
> [  232.226207] usb usb4: root hub lost power or was reset
> [  232.297749] usb usb2: root hub lost power or was reset
> [  232.343227] asix 3-1:1.0 eth0: Failed to write reg index 0x0000: -22
> [  232.343293] asix 3-1:1.0 eth0: Failed to enable software MII access
> [  232.344486] asix 3-1:1.0 eth0: Failed to read reg index 0x0000: -22
> [  232.344512] asix 3-1:1.0 eth0: Failed to write reg index 0x0000: -22
> [  232.344529] PM: dpm_run_callback(): mdio_bus_phy_resume+0x0/0x78 
> returns -22
> [  232.344554] Asix Electronics AX88772C usb-003:002:10: PM: failed to 
> resume: error -22
> [  232.563712] usb 1-1: reset high-speed USB device number 2 using 
> exynos-ehci
> [  232.757653] usb 3-1: reset high-speed USB device number 2 using xhci-hcd
> [  233.730994] OOM killer enabled.
> [  233.734122] Restarting tasks ... done.
> [  233.754992] PM: suspend exit
> 
> real    0m11.546s
> user    0m0.000s
> sys     0m0.530s
> root@...get:~# sleep 2
> root@...get:~# time rtcwake -s10 -mmem
> rtcwake: wakeup from "mem" using /dev/rtc0 at Wed Jun  9 08:17:02 2021
> [  241.959608] PM: suspend entry (deep)
> [  241.963446] Filesystems sync: 0.001 seconds
> [  241.978619] Freezing user space processes ... (elapsed 0.004 seconds) 
> done.
> [  241.989199] OOM killer disabled.
> [  241.992215] Freezing remaining freezable tasks ... (elapsed 0.005 
> seconds) done.
> [  242.003979] printk: Suspending console(s) (use no_console_suspend to 
> debug)
> ...
> [  242.592030] Disabling non-boot CPUs ...
> ...
> [  242.879721] Enabling non-boot CPUs ...
> ...
> [  243.145870] usb usb3: root hub lost power or was reset
> [  243.145910] usb usb4: root hub lost power or was reset
> [  243.147084] usb usb5: root hub lost power or was reset
> [  243.147157] usb usb6: root hub lost power or was reset
> [  243.147298] usb usb1: root hub lost power or was reset
> [  243.217137] usb usb2: root hub lost power or was reset
> [  243.283807] asix 3-1:1.0 eth0: Failed to write reg index 0x0000: -22
> [  243.284005] asix 3-1:1.0 eth0: Failed to enable software MII access
> [  243.285526] asix 3-1:1.0 eth0: Failed to read reg index 0x0000: -22
> [  243.285676] asix 3-1:1.0 eth0: Failed to read reg index 0x0004: -22
> [  243.285769] ------------[ cut here ]------------
> [  243.286011] WARNING: CPU: 2 PID: 2069 at drivers/net/phy/phy.c:916 
> phy_error+0x28/0x68
> [  243.286115] Modules linked in: cmac bnep mwifiex_sdio mwifiex 
> sha256_generic libsha256 sha256_arm cfg80211 btmrvl_sdio btmrvl 
> bluetooth s5p_mfc uvcvideo s5p_jpeg exynos_gsc v
> [  243.287490] CPU: 2 PID: 2069 Comm: kworker/2:5 Not tainted 
> 5.13.0-rc5-next-20210608 #10443
> [  243.287555] Hardware name: Samsung Exynos (Flattened Device Tree)
> [  243.287609] Workqueue: events_power_efficient phy_state_machine
> [  243.287716] [<c0111920>] (unwind_backtrace) from [<c010d0cc>] 
> (show_stack+0x10/0x14)
> [  243.287807] [<c010d0cc>] (show_stack) from [<c0b62360>] 
> (dump_stack_lvl+0xa0/0xc0)
> [  243.287882] [<c0b62360>] (dump_stack_lvl) from [<c0127960>] 
> (__warn+0x118/0x11c)
> [  243.287954] [<c0127960>] (__warn) from [<c0127a18>] 
> (warn_slowpath_fmt+0xb4/0xbc)
> [  243.288021] [<c0127a18>] (warn_slowpath_fmt) from [<c0734968>] 
> (phy_error+0x28/0x68)
> [  243.288094] [<c0734968>] (phy_error) from [<c0735d6c>] 
> (phy_state_machine+0x218/0x278)
> [  243.288173] [<c0735d6c>] (phy_state_machine) from [<c014ae08>] 
> (process_one_work+0x30c/0x884)
> [  243.288254] [<c014ae08>] (process_one_work) from [<c014b3d8>] 
> (worker_thread+0x58/0x594)
> [  243.288333] [<c014b3d8>] (worker_thread) from [<c0153944>] 
> (kthread+0x160/0x1c0)
> [  243.288408] [<c0153944>] (kthread) from [<c010011c>] 
> (ret_from_fork+0x14/0x38)
> [  243.288475] Exception stack(0xc4683fb0 to 0xc4683ff8)
> [  243.288531] 3fa0:                                     00000000 
> 00000000 00000000 00000000
> [  243.288587] 3fc0: 00000000 00000000 00000000 00000000 00000000 
> 00000000 00000000 00000000
> [  243.288641] 3fe0: 00000000 00000000 00000000 00000000 00000013 00000000
> [  243.288690] irq event stamp: 1611
> [  243.288744] hardirqs last  enabled at (1619): [<c01a6ef0>] 
> vprintk_emit+0x230/0x290
> [  243.288830] hardirqs last disabled at (1626): [<c01a6f2c>] 
> vprintk_emit+0x26c/0x290
> [  243.288906] softirqs last  enabled at (1012): [<c0101768>] 
> __do_softirq+0x500/0x63c
> [  243.288978] softirqs last disabled at (1007): [<c01315b4>] 
> irq_exit+0x214/0x220
> [  243.289055] ---[ end trace eeacda95eb7db60a ]---
> [  243.289345] asix 3-1:1.0 eth0: Failed to write reg index 0x0000: -22
> [  243.289466] asix 3-1:1.0 eth0: Failed to write Medium Mode mode to 
> 0x0000: ffffffea
> [  243.289540] asix 3-1:1.0 eth0: Link is Down
> [  243.482809] usb 1-1: reset high-speed USB device number 2 using 
> exynos-ehci
> [  243.647251] usb 3-1: reset high-speed USB device number 2 using xhci-hcd
> [  244.847161] OOM killer enabled.
> [  244.850221] Restarting tasks ... done.
> [  244.861372] PM: suspend exit
> 
> real    0m13.050s
> user    0m0.000s
> sys     0m1.152s
> root@...get:~#
> 
> It looks that some kind of system suspend/resume integration for phylib 
> is not implemented.

Probably it is should be handled only by the asix driver. I'll take a
look in to it. Did interface was able to resume after printing some
warnings?

Regards,
Oleksij
-- 
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