[Bug 90410] [HSW/BDW/SKL] System boot up causes [drm:check_crtc_state [i915]] *ERROR* mismatch in ddi_pll_sel (expected 0x00000000, found 0x80000000)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90410

--- Comment #11 from ye.tian <yex.tian at intel.com> ---
(In reply to Ander Conselvan de Oliveira from comment #10)
> (In reply to Ander Conselvan de Oliveira from comment #4)
> > Created attachment 115732 [details] [review] [review]
> > Possible fix
> 
> So this is indeed the right fix. I sent it to mailing list for review.
> 
> http://lists.freedesktop.org/archives/intel-gfx/2015-May/066726.html

Test it on the latest nightly kernel with this patch, It does not exist on skl,
but there are other error in dmesg.

output:
---------------------

[    3.283878] [drm:check_crtc_state [i915]] *ERROR* mismatch in
dpll_hw_state.ctrl1 (expected 0x00000000, found 0x00000001)
[    3.283880] ------------[ cut here ]------------
[    3.283964] WARNING: CPU: 0 PID: 1291 at
drivers/gpu/drm/i915/intel_display.c:12097 check_crtc_state+0xb67/0xbd1
[i915]()
[    3.283965] pipe state doesn't match!
[    3.283972] Modules linked in: i915 button video drm_kms_helper drm
[    3.283978] CPU: 0 PID: 1291 Comm: kworker/u16:2 Not tainted
4.1.0-rc3_kcloud_bb412d_20150518+ #10
[    3.283979] Hardware name: Intel Corporation Skylake Client platform/Skylake
Y LPDDR3 RVP3, BIOS SKLSE2R1.R00.B082.B00.1504240146 04/24/2015
[    3.283988] Workqueue: events_unbound async_run_entry_fn
[    3.283994]  0000000000000000 0000000000000009 ffffffff817a67ac
ffff880163a2f638
[    3.283997]  ffffffff8103ebde ffff880163a2f630 ffffffffa00cb932
ffff880163620000
[    3.284000]  ffff8801689b7000 ffff8801689be000 ffff880163a2f6c0
ffff880168486800
[    3.284001] Call Trace:
[    3.284011]  [<ffffffff817a67ac>] ? dump_stack+0x40/0x50
[    3.284015]  [<ffffffff8103ebde>] ? warn_slowpath_common+0x98/0xb0
[    3.284088]  [<ffffffffa00cb932>] ? check_crtc_state+0xb67/0xbd1 [i915]
[    3.284093]  [<ffffffff8103ec3b>] ? warn_slowpath_fmt+0x45/0x4a
[    3.284159]  [<ffffffffa00cb932>] ? check_crtc_state+0xb67/0xbd1 [i915]
[    3.284243]  [<ffffffffa00daa73>] ? intel_modeset_check_state+0x4f6/0x87a
[i915]
[    3.284316]  [<ffffffffa00d5f46>] ? __intel_set_mode+0x936/0x94d [i915]
[    3.284387]  [<ffffffffa00db245>] ? intel_crtc_set_config+0x404/0x53d [i915]
[    3.284402]  [<ffffffffa001825f>] ? drm_modeset_lock+0x4e/0xa3 [drm]
[    3.284422]  [<ffffffffa000c326>] ? drm_mode_set_config_internal+0x4e/0xd2
[drm]
[    3.284429]  [<ffffffffa005afed>] ? restore_fbdev_mode+0xac/0xc3
[drm_kms_helper]
[    3.284436]  [<ffffffffa005c7ee>] ?
drm_fb_helper_restore_fbdev_mode_unlocked+0x1e/0x54 [drm_kms_helper]
[    3.284442]  [<ffffffffa005c852>] ? drm_fb_helper_set_par+0x2e/0x32
[drm_kms_helper]
[    3.284525]  [<ffffffffa00e7a8b>] ? intel_fbdev_set_par+0x11/0x55 [i915]
[    3.284531]  [<ffffffff8137e96e>] ? fbcon_init+0x2fd/0x406
[    3.284537]  [<ffffffff813d43df>] ? visual_init+0xaf/0x102
[    3.284540]  [<ffffffff813d5931>] ? do_bind_con_driver+0x19e/0x2c2
[    3.284544]  [<ffffffff813d5d09>] ? do_take_over_console+0x12c/0x15c
[    3.284549]  [<ffffffff8137e05d>] ? do_fbcon_takeover+0x53/0x97
[    3.284555]  [<ffffffff810549dc>] ? notifier_call_chain+0x35/0x59
[    3.284560]  [<ffffffff81054c23>] ? __blocking_notifier_call_chain+0x43/0x5b
[    3.284566]  [<ffffffff813860eb>] ? lock_fb_info+0x12/0x2f
[    3.284571]  [<ffffffff81387906>] ? register_framebuffer+0x26c/0x2a2
[    3.284578]  [<ffffffffa005cb03>] ? drm_fb_helper_initial_config+0x2ad/0x34a
[drm_kms_helper]
[    3.284581]  [<ffffffff81055b8f>] ? async_run_entry_fn+0x2d/0xbf
[    3.284585]  [<ffffffff8104f985>] ? process_one_work+0x1b2/0x31d
[    3.284589]  [<ffffffff8105026f>] ? worker_thread+0x265/0x351
[    3.284592]  [<ffffffff8105000a>] ? cancel_delayed_work_sync+0xa/0xa
[    3.284597]  [<ffffffff81053ee1>] ? kthread+0xce/0xd6
[    3.284602]  [<ffffffff81053e13>] ? kthread_create_on_node+0x162/0x162
[    3.284606]  [<ffffffff817ac6d2>] ? ret_from_fork+0x42/0x70
[    3.284610]  [<ffffffff81053e13>] ? kthread_create_on_node+0x162/0x162
[    3.284613] ---[ end trace c0e7c973a94133fe ]---

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