Date:   Fri, 4 Aug 2017 12:00:41 +0100
From:   Will Deacon <will.deacon@....com>
To:     Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Cc:     isubramanian@....com, kchudgar@....com, qnguyen@....com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Laura Abbott <labbott@...hat.com>
Subject: Re: [PATCH net] xgene: Always get clk source, but ignore if it's
 missing for SGMII ports

On Thu, Aug 03, 2017 at 03:43:14PM +0200, Thomas Bogendoerfer wrote:
> From: Thomas Bogendoerfer <tbogendoerfer@...e.de>
> 
> Even the driver doesn't do anything with the clk source for SGMII
> ports it needs to be enabled by doing a devm_clk_get(), if there is
> a clk source in DT.
> 
> Fixes: 0db01097cabd ('xgene: Don't fail probe, if there is no clk resource for SGMII interfaces')
> Signed-off-by: Thomas Bogendoerfer <tbogendoerfer@...e.de>
> Tested-by: Laura Abbott <labbott@...hat.com>
> Acked-by: Iyappan Subramanian <isubramanian@....com>
> ---
>  drivers/net/ethernet/apm/xgene/xgene_enet_main.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)

Thanks, this fixes a boot-time crash (below) when bringing up the interface
on my xgene board with -rc3, so:

Tested-by: Will Deacon <will.deacon@....com>

Will

--->8

[    8.076583] synchronous external abort: synchronous external abort (0x96000010) at 0xffff00000aca0010
[    8.085777] internal error: : 96000010 [#1] preempt smp
[    8.090977] modules linked in:
[    8.094020] cpu: 4 pid: 2345 comm: ip not tainted 4.13.0-rc3-00002-g93bd9a45f608 #2
[    8.101638] hardware name: appliedmicro x-gene mustang board/x-gene mustang board, bios 3.06.25 oct 17 2016
[    8.111330] task: ffff8003e7181c00 task.stack: ffff8003e5afc000
[    8.117227] pc is at xgene_enet_rd_mac+0x80/0x108
[    8.121909] lr is at xgene_enet_rd_mac+0x50/0x108
[    8.126589] pc : [<ffff00000865f140>] lr : [<ffff00000865f110>] pstate: a0000145
[    8.133948] sp : ffff8003e5aff570
[    8.137244] x29: ffff8003e5aff570 x28: 0000000000000001 
[    8.142533] x27: ffff8003eb9cc838 x26: ffff000008663970 
[    8.147820] x25: ffff00000aca000c x24: ffff8003eb9cc000 
[    8.153107] x23: 0000000000000000 x22: ffff00000aca0004 
[    8.158394] x21: ffff8003eb9cc9f0 x20: ffff00000aca0010 
[    8.163680] x19: 000000000000000b x18: 0000000000000001 
[    8.168966] x17: 0000000120177170 x16: ffff000008889dc8 
[    8.174253] x15: ffffffffffffffff x14: 00000001e15a50b8 
[    8.179539] x13: 0000000000000000 x12: ffff8003e8cb0a00 
[    8.184825] x11: 0000000000000000 x10: 0000000000000004 
[    8.190111] x9 : 00000000ffffffff x8 : ffff8003fff75468 
[    8.195398] x7 : 00000000000d7c8c x6 : ffff0000089c0000 
[    8.200684] x5 : 0000000000000001 x4 : ffff8003e7181c00 
[    8.205969] x3 : 0000000000000000 x2 : 0000000000000000 
[    8.211255] x1 : 0000000000330033 x0 : 0000000040000000 
[    8.216543] process ip (pid: 2345, stack limit = 0xffff8003e5afc000)
[    8.222865] stack: (0xffff8003e5aff570 to 0xffff8003e5b00000)
[    8.228582] f560:                                   ffff8003e5aff5c0 ffff0000086600f4
[    8.236374] f580: 0000000000000001 ffff8003eb9cc800 0000000000000001 ffff8003eb9cc000
[    8.244164] f5a0: ffff8003eca16a2e ffff8003ec93a410 ffff000008acdf08 ffff00000863b684
[    8.251955] f5c0: ffff8003e5aff5f0 ffff0000086601f4 ffff8003eb9cc800 0000000000000000
[    8.259745] f5e0: 0000000000000000 ffff000008663ce0 ffff8003e5aff600 ffff000008663cf0
[    8.267536] f600: ffff8003e5aff670 ffff0000088aa3b8 ffff8003eb9cc000 0000000000001003
[    8.275326] f620: ffff000008ace018 ffff8003eb9cc048 0000000000001002 ffff8003e5aff8e0
[    8.283116] f640: ffff000008ace018 ffff8003e8dd8010 ffff8003e5affb78 0000000000000000
[    8.290907] f660: ffff000008663000 ffff000008d185f0 ffff8003e5aff6b0 ffff0000088aa6b8
[    8.298697] f680: ffff8003eb9cc000 0000000000001003 0000000000000001 0000000000000000
[    8.306488] f6a0: ffff8003eb9cc000 ffff8003eb9cc000 ffff8003e5aff6f0 ffff0000088aa798
[    8.314278] f6c0: ffff8003eb9cc000 0000000000001002 0000000000000000 0000000000000000
[    8.322069] f6e0: ffff8003e6868000 000000000000002b ffff8003e5aff720 ffff0000088bc168
[    8.329859] f700: ffff8003e8dd8000 ffff8003eb9cc000 0000000000000000 ffff8003e5aff968
[    8.337650] f720: ffff8003e5aff840 ffff0000088be918 ffff000008d5e000 ffff8003eb9cc000
[    8.345441] f740: 0000000000000000 ffff8003e5affb78 0000000000000000 0000000000000000
[    8.353231] f760: ffff8003e5aff840 ffff000008b159c0 ffff8003e8dd8020 ffff0000081b3a90
[    8.361022] f780: ffff8003e7037b80 ffff7e000f9b0e00 00e80043e6c38f53 ffff8003ecf49450
[    8.368812] f7a0: ffff8003e7037b80 0000000000000001 ffff8003e5aff7d0 ffff0000081bf0cc
[    8.376603] f7c0: ffff7e000f9b0e00 ffff0000081b39c0 ffff8003e5aff7e0 ffff00000818ef70
[    8.384393] f7e0: ffff8003e5aff800 ffff0000081b3a9c ffff8003e5aff840 ffff0000088be3e0
[    8.392184] f800: ffff8003e8dd8000 ffff0000081b44ec 0000000000000000 ffff8003e5affb78
[    8.399974] f820: ffff8003e5aff840 ffff0000088be438 ffff8003e8dd8000 ffff00000858169c
[    8.407765] f840: ffff8003e5affad0 ffff0000088bec24 0000000000000000 ffff8003e8dd8000
[    8.415555] f860: ffff8003e5affb78 0000000000000000 ffff8003e6868000 0000000000000000
[    8.423346] f880: 0000000000000000 0000000000000008 ffff0000089b1000 ffff8003e7181c00
[    8.431136] f8a0: ffff8003e5aff8c0 ffff8003e6868000 0000000000000000 ffff000008fc7e80
[    8.438927] f8c0: ffff000008b15a80 ffff8003e8dd8010 ffff8003e71e3800 ffff8003e71e3f6c
[    8.446717] f8e0: 0000000000000000 00000000000001c0 ffff000008ecd000 ffff000008ed9000
[    8.454508] f900: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
[    8.462297] f920: 0000000000000000 0000000000000000 0000000000000000 ffff8003e71e3800
[    8.470088] f940: 0000000000000000 00000000000001c0 ffff8003fff8f400 ffff000008ed9bc8
[    8.477878] f960: ffff8003e5aff970 0000000000000000 0000000000000000 0000000000000000
[    8.485668] f980: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
[    8.493458] f9a0: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
[    8.501255] f9c0: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
[    8.501258] f9e0: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
[    8.501260] fa00: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
[    8.501263] fa20: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
[    8.501265] fa40: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
[    8.501268] fa60: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
[    8.501270] fa80: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
[    8.501273] faa0: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
[    8.501276] fac0: 0000000000000000 0000000000000000 ffff8003e5affb40 ffff0000088d41c8
[    8.501278] fae0: ffff8003e8dd8000 ffff8003e6868000 ffff0000088bea98 ffff8003e6868000
[    8.501281] fb00: ffff8003e5affc08 ffff8003fffd2500 0000000000000140 ffff800300000000
[    8.501284] fb20: ffff8003e5affb70 ffff00000889220c ffff8003e5affb50 ffff0000088d1d98
[    8.501287] fb40: ffff8003e5affba0 ffff0000088bb364 ffff8003e6868000 ffff8003ec6e6c00
[    8.501289] fb60: 0000000000000020 0000000000000000 ffff8003e5affb90 0000000000000000
[    8.501292] fb80: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
[    8.501294] fba0: ffff8003e5affbc0 ffff0000088d3934 ffff8003ec8aa800 ffff8003ec6e6c00
[    8.501297] fbc0: ffff8003e5affc10 ffff0000088d3dc8 ffff8003e5affe58 0000000000000000
[    8.501300] fbe0: ffff8003e6868000 ffff8003ec6e6c00 0000000000000000 0000000000000020
[    8.501302] fc00: ffff8003e5affc10 7fffffffffffffff ffff8003e5affc90 ffff000008888570
[    8.501305] fc20: ffff8003e5affe58 0000000000000000 0000000000000000 ffff8003eebdd900
[    8.501308] fc40: 0000000000000000 0000000000000000 ffff8003e5affcf8 00000000000000d3
[    8.501311] fc60: ffff8003e5affc80 0000ffffea686a70 ffff8003e8c80500 0000000000000000
[    8.501313] fc80: 0000000000000929 0000000000000000 ffff8003e5affca0 ffff000008888d4c
[    8.501316] fca0: ffff8003e5affe20 ffff000008889d6c ffff8003eebdd900 0000ffffea686a90
[    8.501319] fcc0: 0000000000000000 0000ffff8bd5abf4 0000000080000000 0000000000000015
[    8.501321] fce0: 0000000000000124 ffff000008220d04 0000000000000000 ffff000008220f54
[    8.501324] fd00: ffff8003fa9e1000 ffff8003e7037b80 014000c000000055 0000000ffffffffc
[    8.501327] fd20: 0000000000000010 ffff800300000000 ffff8003e8ffeff8 0000000000000000
[    8.501330] fd40: 0000000000000000 0000000000000000 0000000000000000 ffff8003ecf49460
[    8.501332] fd60: ffff7e000fb3d270 0000000000000000 ffff8003e5affda0 ffff000008097fc0
[    8.501335] fd80: ffff8003e7181c00 0000ffffea68c000 ffff8003e5affda0 ffff000008098008
[    8.501338] fda0: 0000ffffea68eb78 0000000000000020 0000000092000047 ffff0000089b7250
[    8.501340] fdc0: 0000ffffea68c000 ffff8003e5affec0 0000000020000000 0000000000000024
[    8.501343] fde0: ffff8003e5affdf0 ffff0000082235d8 ffff8003e5affe00 ffff000008888180
[    8.501346] fe00: ffff8003e5affe20 ffff000008889d48 0000000000000000 0000ffffea686a90
[    8.501349] fe20: ffff8003e5affeb0 ffff000008889dd8 0000000000000000 00008003f70a8000
[    8.501351] fe40: ffffffffffffffff ffff0000081febbc fffffff700000000 ffff8003e5affd20
[    8.501354] fe60: ffff80030000000c ffff000000000001 0000000000000000 0000000000000000
[    8.501356] fe80: ffff8003e5affdb0 0000000000000000 0000000000000000 0000000000000000
[    8.501359] fea0: 0000000000000000 0000000000000000 0000000000000000 ffff000008083730
[    8.501361] fec0: 0000000000000003 0000ffffea686a90 0000000000000000 0000000000000000
[    8.501364] fee0: 0000ffffea68eac8 0000000000000004 0000000031687465 0000000031687465
[    8.501367] ff00: 00000000000000d3 7f7f7f7fffffffff 0101010101010101 7f7f7f7f7f7f7f7f
[    8.501370] ff20: 0101010101010101 0000000000000000 0000000000000000 00000000000005bf
[    8.501373] ff40: 0000ffff8bd5abc8 0000000120177170 0000000000040d00 0000ffffea68eb78
[    8.501376] ff60: 00000000581b7100 0000000120176000 0000ffffea686ac8 0000ffffea686a90
[    8.501378] ff80: 0000000000000010 0000000000000000 00000001201773b8 0000ffffea68eb50
[    8.501381] ffa0: 0000ffffea68f2c8 0000ffffea6869d0 000000012014ee10 0000ffffea6869d0
[    8.501384] ffc0: 0000ffff8bd5abf4 0000000080000000 0000000000000003 00000000000000d3
[    8.501386] ffe0: 0000000000000000 0000000000000000 1c1c1c1c1c1c1c1c 1c1c1c1c1c1c1c1c
[    8.501388] call trace:
[    8.501391] exception stack(0xffff8003e5aff3a0 to 0xffff8003e5aff4d0)
[    8.501394] f3a0: 000000000000000b 0001000000000000 ffff8003e5aff570 ffff00000865f140
[    8.501397] f3c0: ffff00000865f140 00000000a0000145 0000000000000025 ffff00000aca000c
[    8.501400] f3e0: ffff000008663970 ffff8003eb9cc838 ffff8003e7181c00 ffff8003e5aff570
[    8.501402] f400: ffff00000865f110 ffff8003e5aff440 ffff000008082dfc 0000000060000145
[    8.501405] f420: ffff8003fff75400 ffff0000080e7b74 0001000000000000 ffff0000080e7ba0
[    8.501408] f440: 0000000040000000 0000000000330033 0000000000000000 0000000000000000
[    8.501411] f460: ffff8003e7181c00 0000000000000001 ffff0000089c0000 00000000000d7c8c
[    8.501413] f480: ffff8003fff75468 00000000ffffffff 0000000000000004 0000000000000000
[    8.501416] f4a0: ffff8003e8cb0a00 0000000000000000 00000001e15a50b8 ffffffffffffffff
[    8.501418] f4c0: ffff000008889dc8 0000000120177170
[    8.501424] [<ffff00000865f140>] xgene_enet_rd_mac+0x80/0x108
[    8.501429] [<ffff0000086600f4>] xgene_sgmac_rxtx+0x24/0x50
[    8.501431] [<ffff0000086601f4>] xgene_sgmac_tx_enable+0x14/0x20
[    8.501434] [<ffff000008663cf0>] xgene_enet_open+0x338/0x3f0
[    8.501439] [<ffff0000088aa3b8>] __dev_open+0xc8/0x140
[    8.501443] [<ffff0000088aa6b8>] __dev_change_flags+0x98/0x158
[    8.501446] [<ffff0000088aa798>] dev_change_flags+0x20/0x60
[    8.501451] [<ffff0000088bc168>] do_setlink+0x248/0xce8
[    8.501454] [<ffff0000088be918>] rtnl_newlink+0x5b0/0x730
[    8.501457] [<ffff0000088bec24>] rtnetlink_rcv_msg+0x18c/0x1f8
[    8.501460] [<ffff0000088d41c8>] netlink_rcv_skb+0xb0/0x110
[    8.501463] [<ffff0000088bb364>] rtnetlink_rcv+0x2c/0x40
[    8.501467] [<ffff0000088d3934>] netlink_unicast+0x184/0x220
[    8.501469] [<ffff0000088d3dc8>] netlink_sendmsg+0x300/0x378
[    8.501473] [<ffff000008888570>] sock_sendmsg+0x18/0x30
[    8.501475] [<ffff000008888d4c>] ___sys_sendmsg+0x264/0x298
[    8.501479] [<ffff000008889d6c>] __sys_sendmsg+0x44/0xa0
[    8.501481] [<ffff000008889dd8>] sys_sendmsg+0x10/0x20
[    8.501486] [<ffff000008083730>] el0_svc_naked+0x24/0x28
[    8.501490] code: 52800173 14000003 d28218e0 940c82f9 (b9400282) 
[    8.501493] ---[ end trace a3c9ec71d1295493 ]---
[    8.501516] note: ip[2345] exited with preempt_count 1

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