[Bug 104975] Delay in skl_disable_plane() causes a system freeze

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=104975

--- Comment #19 from Azhar <azhar.shaikh at intel.com> ---
With the patches rebased on 4.15, I do not see the below message:

[drm] Atomic update on pipe (A) took 123 us, max time under evasion is 100 us 

There was a WARN_ON trigerred from below line once.

https://cgit.freedesktop.org/~mlankhorst/linux/tree/drivers/gpu/drm/drm_atomic.c?h=v4.15.x#n862

[18796.092771] WARNING: CPU: 1 PID: 22704 at
/mnt/host/source/src/third_party/kernel/v4.4/drivers/gpu/drm/drm_atomic.c:862
drm_atomic_check_only+0x94/0x4dd
[18796.108037] Modules linked in: cmac rfcomm uinput lzo lzo_compress zram
bridge btusb stp llc btrtl btbcm btintel bluetooth ecdh_generic ov13858 ov5670
v4l2_fwnode snd_soc_max98927 at24 dw9714 acpi_als i
pt_MASQUERADE nf_nat_masquerade_ipv4 xt_mark fuse snd_seq_dummy snd_seq
snd_seq_device cfg80211 iio_trig_sysfs ip6table_filter cros_ec_light_prox
cros_ec_sensors cros_ec_sensors_core industrialio_triggered
_buffer kfifo_buf industrialio r8152 mii joydev
[18796.152665] CPU: 1 PID: 22704 Comm: DrmThread Not tainted
4.15.3-00093-gc5aaf9d7faec #84
[18796.170382] RIP: 0010:drm_atomic_check_only+0x94/0x4dd
[18796.176128] RSP: 0018:ffffafb2007bfc58 EFLAGS: 00010246
[18796.181973] RAX: 0000000000000000 RBX: ffff98a96049c900 RCX:
ffff98a81d43c400
[18796.189944] RDX: ffffffffb7c1191e RSI: 0000000000000010 RDI:
ffff98a938a7a200
[18796.197921] RBP: ffffafb2007bfcb0 R08: 0000000000000020 R09:
ffff98a81d432328
[18796.205899] R10: ffff98aa34ab4800 R11: ffff98a82da17800 R12:
ffff98aa34b38000
[18796.213876] R13: ffff98aa34b0a000 R14: ffff98a81d43c400 R15:
0000000000000000
[18796.221847] FS:  00007b69e67b9700(0000) GS:ffff98aa3ec80000(0000)
knlGS:0000000000000000
[18796.230894] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[18796.237316] CR2: 00003ada01075008 CR3: 00000001f766c002 CR4:
00000000003606e0
[18796.245294] Call Trace:
[18796.248037]  drm_atomic_nonblocking_commit+0x18/0x5a
[18796.253594]  drm_mode_atomic_ioctl+0x7e1/0x8de
[18796.258567]  ? drm_atomic_set_property+0x3f1/0x3f1
[18796.263928]  drm_ioctl+0x2ac/0x3dc
[18796.267732]  ? security_file_ioctl+0x35/0x49
[18796.272505]  SyS_ioctl+0x492/0x4d7
[18796.276305]  do_syscall_64+0x60/0x6e
[18796.280298]  entry_SYSCALL_64_after_hwframe+0x21/0x86
[18796.285945] RIP: 0033:0x7b69ec1e8967
[18796.289935] RSP: 002b:00007b69e67b8488 EFLAGS: 00000246 ORIG_RAX:
0000000000000010
[18796.298391] RAX: ffffffffffffffda RBX: 000000000000001c RCX:
00007b69ec1e8967
[18796.306362] RDX: 00007b69e67b84f0 RSI: 00000000c03864bc RDI:
000000000000001d
[18796.314331] RBP: 00007b69e67b84b0 R08: 00003ada00de3b70 R09:
00003ada00de3b90
[18796.322301] R10: 0000000000000000 R11: 0000000000000246 R12:
000000000000001d
[18796.330263] R13: 00003ada00de3b80 R14: 00007b69e67b84f0 R15:
00000000c03864bc
[18796.338233] Code: 03 7e 18 4c 8b 2f 4d 85 ed 0f 84 be 00 00 00 48 8b 5f 18
4c 8b 53 08 4d 85 d2 0f 84 fd 01 00 00 48 83 7b 10 00 0f 85 f2 01 00 00 <0f> ff
48 c7 c2 18 1a c1 b7 e9 78 03 00 00 8b 4b 28 85
 c9 0f 88 
[18796.359348] ---[ end trace 9c41097535acdec5 ]---
[18796.366777] traps: DrmThread[22704] trap int3 ip:5575cbb07df2
sp:7b69e67b8990 error:0 in chrome[5575caa49000+86d4000]

I have kept the test running overnight, in case we get any new prints/warnings.

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