Hi Abel,
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?
Thanks,
baruch
--
http://baruch.siach.name/blog/ ~. .~ Tk Open Systems
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