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Date:   Thu, 23 May 2019 01:02:22 +0000
From:   Andy Duan <fugang.duan@....com>
To:     Baruch Siach <baruch@...s.co.il>, Abel Vesa <abel.vesa@....com>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        dl-linux-imx <linux-imx@....com>,
        Fabio Estevam <festevam@...il.com>
Subject: RE: [EXT] i.MX8MQ clk: enet1_root_clk already disabled

From: Baruch Siach <baruch@...s.co.il>
> I'm testing kernel v5.2-rc1 on my i.MX8MQ system, SolidRun Hummingboard
> Pulse. The fec driver happens to probe before the gpio driver that we need for
> the PHY reset. So fec_reset_phy() returns -EPROBE_DEFER. This triggers the
> splat below when clk_ahb is disabled somewhere below the 'failed_reset'
> label:
> 
> [    1.267218] enet1_root_clk already disabled
> [    1.271462] WARNING: CPU: 0 PID: 1 at drivers/clk/clk.c:924
> clk_core_disable+0xa0/0xa8
> [    1.279396] CPU: 0 PID: 1 Comm: swapper/0 Not tainted
> 5.2.0-rc1-00002-gb88a935c6e3f-dirty #1340
> [    1.288105] Hardware name: SolidRun i.MX8MQ HummingBoard Pulse
> (DT)
> [    1.294383] pstate: 60000085 (nZCv daIf -PAN -UAO)
> [    1.299184] pc : clk_core_disable+0xa0/0xa8
> [    1.303376] lr : clk_core_disable+0xa0/0xa8
> [    1.307565] sp : ffff00001003bad0
> [    1.310886] x29: ffff00001003bad0 x28: ffff0000110c4000
> [    1.316208] x27: ffff00001099f0b0 x26: ffff8000bd9f50a8
> [    1.321530] x25: ffff00001099dfb0 x24: ffff0000110c4990
> [    1.326852] x23: ffff8000bd9f4810 x22: ffff8000b8820000
> [    1.332173] x21: ffff8000b949ec00 x20: ffff8000b91d0d00
> [    1.337495] x19: ffff8000b91d0d00 x18: 0000000000000010
> [    1.342816] x17: 0000000000000000 x16: 0000000000000000
> [    1.348138] x15: ffffffffffffffff x14: 0720072007200720
> [    1.353459] x13: 0720072007200720 x12: 0720072007200720
> [    1.358780] x11: 0720072007200720 x10: 0720072007200720
> [    1.364101] x9 : 0720072007200720 x8 : 0720072007200720
> [    1.369423] x7 : 000000000000009b x6 : ffff8000ba020f00
> [    1.374744] x5 : 0000000000000000 x4 : 0000000000000000
> [    1.380065] x3 : 00000000ffffffff x2 : ffff000011008ce0
> [    1.385386] x1 : dc292ba4797d3600 x0 : 0000000000000000
> [    1.390708] Call trace:
> [    1.393162]  clk_core_disable+0xa0/0xa8
> [    1.397006]  clk_core_disable_lock+0x20/0x38
> [    1.401286]  clk_disable+0x1c/0x28
> [    1.404698]  fec_probe+0x6a4/0x1248
> [    1.408196]  platform_drv_probe+0x50/0xa0
> [    1.412214]  really_probe+0xcc/0x280
> [    1.415797]  driver_probe_device+0x54/0xe8
> [    1.419901]  device_driver_attach+0x6c/0x78
> [    1.424092]  __driver_attach+0x68/0xe8
> [    1.427851]  bus_for_each_dev+0x70/0xc0
> [    1.431695]  driver_attach+0x20/0x28
> [    1.435279]  bus_add_driver+0x170/0x1d0
> [    1.439123]  driver_register+0x60/0x110
> [    1.442967]  __platform_driver_register+0x44/0x50
> [    1.447683]  fec_driver_init+0x18/0x20
> [    1.451443]  do_one_initcall+0x70/0x164
> [    1.455288]  kernel_init_freeable+0x1a0/0x234
> [    1.459657]  kernel_init+0x10/0x100
> [    1.463156]  ret_from_fork+0x10/0x18
> [    1.466743] ---[ end trace 5e50e985bb318e6c ]---
> 
> On the following probe attempt after gpio probe, fec probes successfully, and
> Ethernet is functional. So this is not a fatal error, but it is not nice.
> 
> Any idea how to fix it?
Below patch can fix the issue. You can try it. I will send the patch later.

@@ -3556,7 +3555,7 @@ fec_probe(struct platform_device *pdev)
        if (fep->reg_phy)
                regulator_disable(fep->reg_phy);
 failed_reset:
-       pm_runtime_put(&pdev->dev);
+       pm_runtime_put_noidle(&pdev->dev);
        pm_runtime_disable(&pdev->dev);
 failed_regulator:
        clk_disable_unprepare(fep->clk_ahb);
> 
> Thanks,
> baruch
> 
> --
> 
> https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fbaruch.
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> ~. .~   Tk Open Systems
> =}------------------------------------------------ooO--U--Ooo------------{=
>    - baruch@...s.co.il - tel: +972.2.679.5364,
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> v5hrrNdU4CjEYhSoys%3D&amp;reserved=0 -

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