Date:	Tue, 25 Jun 2013 09:05:11 -1000
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Shuah Khan <shuah.kh@...sung.com>,
	Chris Wilson <chris@...is-wilson.co.uk>,
	Daniel Vetter <daniel.vetter@...ll.ch>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"shuahkhan@...il.com" <shuahkhan@...il.com>,
	Dave Airlie <airlied@...hat.com>
Subject: Re: Linux 3.10-rc7

Adding the appropriate cc'd.. I'm not seeing why this would start
happening now, but there's been a number of commits that touch the
intel crtc 'active' state and hotplug logic, so I'm assuming one of
them is to blame.. Lots of small changes around
ironlake_crtc_mode_set() etc.

This warning seems to imply that the pll activity count is buggered.
Anybody? Chris/Daniel/Dave?

                  Linus

On Tue, Jun 25, 2013 at 5:28 AM, Shuah Khan <shuah.kh@...sung.com> wrote:
>
> I started seeing this message during suspend to disk in reboot mode test
> back 3.10-rc6 and 3.10-rc7 has the same problem. I haven't started
> debugging yet. Looking to see if this is a known issue. I don't see this
> problem on 3.9.7.
>
> [ 2097.548150] WARNING: at drivers/gpu/drm/i915/intel_display.c:1656
> ironlake_crtc_disable+0x865/0x890 [i915]()
> [ 2097.548177] Modules linked in: rfcomm bnep parport_pc ppdev arc4
> iwldvm mac80211 ext2 i915 joydev coretemp kvm_intel snd_hda_codec_hdmi
> iwlwifi snd_hda_codec_realtek kvm snd_hda_intel snd_hda_codec cfg80211
> snd_hwdep snd_pcm drm_kms_helper btusb snd_seq_midi bluetooth drm
> snd_rawmidi uvcvideo snd_seq_midi_event ghash_clmulni_intel snd_seq
> aesni_intel ablk_helper videobuf2_core cryptd tpm_infineon videodev
> snd_timer lrw gf128mul snd_seq_device glue_helper psmouse snd aes_x86_64
> media samsung_laptop videobuf2_vmalloc microcode videobuf2_memops
> serio_raw soundcore tpm_tis snd_page_alloc i2c_algo_bit lpc_ich wmi
> video mac_hid lp parport hid_generic usbhid hid r8169
> [ 2097.548180] CPU: 3 PID: 2736 Comm: kworker/u16:0 Not tainted
> 3.10.0-rc7+ #2
> [ 2097.548181] Hardware name: SAMSUNG ELECTRONICS CO., LTD.
> 900X3C/900X3D/900X4C/900X4D/SAMSUNG_NP1234567890, BIOS P03AAC 07/12/2012
> [ 2097.548186] Workqueue: events_unbound async_run_entry_fn
> [ 2097.548189]  0000000000000009 ffff8803f05a5a58 ffffffff81690b04
> ffff8803f05a5a98
> [ 2097.548190]  ffffffff81043880 ffff88040a978000 ffff8803f074e000
> ffff88040a978000
> [ 2097.548192]  ffff88040a97a688 00000000000e0300 ffff88040af6e000
> ffff8803f05a5aa8
> [ 2097.548192] Call Trace:
> [ 2097.548197]  [<ffffffff81690b04>] dump_stack+0x19/0x1b
> [ 2097.548201]  [<ffffffff81043880>] warn_slowpath_common+0x70/0xa0
> [ 2097.548203]  [<ffffffff810438ca>] warn_slowpath_null+0x1a/0x20
> [ 2097.548214]  [<ffffffffa0428f35>] ironlake_crtc_disable+0x865/0x890
> [i915]
> [ 2097.548223]  [<ffffffffa042a408>] __intel_set_mode+0x458/0xd00 [i915]
> [ 2097.548232]  [<ffffffffa04345d9>]
> intel_modeset_setup_hw_state+0x679/0xa60 [i915]
> [ 2097.548236]  [<ffffffff8169404d>] ? mutex_lock+0x1d/0x50
> [ 2097.548242]  [<ffffffffa03ff277>] __i915_drm_thaw+0x137/0x1d0 [i915]
> [ 2097.548249]  [<ffffffffa03ff5cb>] i915_resume+0x7b/0xd0 [i915]
> [ 2097.548255]  [<ffffffffa03ff636>] i915_pm_resume+0x16/0x20 [i915]
> [ 2097.548258]  [<ffffffff81355463>] pci_pm_restore+0x73/0xd0
> [ 2097.548259]  [<ffffffff813553f0>] ? pci_pm_default_resume+0x50/0x50
> [ 2097.548261]  [<ffffffff813553f0>] ? pci_pm_default_resume+0x50/0x50
> [ 2097.548264]  [<ffffffff81424f9b>] dpm_run_callback.isra.3+0x3b/0x70
> [ 2097.548265]  [<ffffffff81425824>] device_resume+0xd4/0x1b0
> [ 2097.548267]  [<ffffffff81425921>] async_resume+0x21/0x50
> [ 2097.548269]  [<ffffffff8107001b>] async_run_entry_fn+0x3b/0x140
> [ 2097.548272]  [<ffffffff810626ae>] process_one_work+0x16e/0x3f0
> [ 2097.548274]  [<ffffffff81062dc2>] worker_thread+0x122/0x370
> [ 2097.548276]  [<ffffffff81062ca0>] ? rescuer_thread+0x330/0x330
> [ 2097.548277]  [<ffffffff810695e0>] kthread+0xc0/0xd0
> [ 2097.548279]  [<ffffffff81069520>] ? kthread_create_on_node+0x130/0x130
> [ 2097.548281]  [<ffffffff8169f81c>] ret_from_fork+0x7c/0xb0
> [ 2097.548283]  [<ffffffff81069520>] ? kthread_create_on_node+0x130/0x130
> [ 2097.548284] ---[ end trace 989c661118e428a8 ]---
>
> [ 2097.548295] WARNING: at drivers/gpu/drm/i915/intel_display.c:1091
> assert_pch_pll+0x18f/0x1f0 [i915]()
> [ 2097.548296] PCH PLL state for reg c6014 assertion failure (expected
> off, current on), val=89086008
> [ 2097.548315] Modules linked in: rfcomm bnep parport_pc ppdev arc4
> iwldvm mac80211 ext2 i915 joydev coretemp kvm_intel snd_hda_codec_hdmi
> iwlwifi snd_hda_codec_realtek kvm snd_hda_intel snd_hda_codec cfg80211
> snd_hwdep snd_pcm drm_kms_helper btusb snd_seq_midi bluetooth drm
> snd_rawmidi uvcvideo snd_seq_midi_event ghash_clmulni_intel snd_seq
> aesni_intel ablk_helper videobuf2_core cryptd tpm_infineon videodev
> snd_timer lrw gf128mul snd_seq_device glue_helper psmouse snd aes_x86_64
> media samsung_laptop videobuf2_vmalloc microcode videobuf2_memops
> serio_raw soundcore tpm_tis snd_page_alloc i2c_algo_bit lpc_ich wmi
> video mac_hid lp parport hid_generic usbhid hid r8169
> [ 2097.548317] CPU: 3 PID: 2736 Comm: kworker/u16:0 Tainted: G        W
>     3.10.0-rc7+ #2
> [ 2097.548318] Hardware name: SAMSUNG ELECTRONICS CO., LTD.
> 900X3C/900X3D/900X4C/900X4D/SAMSUNG_NP1234567890, BIOS P03AAC 07/12/2012
> [ 2097.548321] Workqueue: events_unbound async_run_entry_fn
> [ 2097.548323]  0000000000000009 ffff8803f05a59b8 ffffffff81690b04
> ffff8803f05a59f8
> [ 2097.548324]  ffffffff81043880 0000000000000009 ffff88040a978000
> ffff88040a97a688
> [ 2097.548325]  0000000000000000 0000000000000000 0000000089086008
> ffff8803f05a5a58
> [ 2097.548326] Call Trace:
> [ 2097.548328]  [<ffffffff81690b04>] dump_stack+0x19/0x1b
> [ 2097.548330]  [<ffffffff81043880>] warn_slowpath_common+0x70/0xa0
> [ 2097.548332]  [<ffffffff81043966>] warn_slowpath_fmt+0x46/0x50
> [ 2097.548360]  [<ffffffffa042436f>] assert_pch_pll+0x18f/0x1f0 [i915]
> [ 2097.548382]  [<ffffffffa0428c79>] ironlake_crtc_disable+0x5a9/0x890
> [i915]
> [ 2097.548404]  [<ffffffffa042a408>] __intel_set_mode+0x458/0xd00 [i915]
> [ 2097.548429]  [<ffffffffa04345d9>]
> intel_modeset_setup_hw_state+0x679/0xa60 [i915]
> [ 2097.548438]  [<ffffffff8169404d>] ? mutex_lock+0x1d/0x50
> [ 2097.548454]  [<ffffffffa03ff277>] __i915_drm_thaw+0x137/0x1d0 [i915]
> [ 2097.548472]  [<ffffffffa03ff5cb>] i915_resume+0x7b/0xd0 [i915]
> [ 2097.548490]  [<ffffffffa03ff636>] i915_pm_resume+0x16/0x20 [i915]
> [ 2097.548496]  [<ffffffff81355463>] pci_pm_restore+0x73/0xd0
> [ 2097.548500]  [<ffffffff813553f0>] ? pci_pm_default_resume+0x50/0x50
> [ 2097.548504]  [<ffffffff813553f0>] ? pci_pm_default_resume+0x50/0x50
> [ 2097.548509]  [<ffffffff81424f9b>] dpm_run_callback.isra.3+0x3b/0x70
> [ 2097.548513]  [<ffffffff81425824>] device_resume+0xd4/0x1b0
> [ 2097.548517]  [<ffffffff81425921>] async_resume+0x21/0x50
> [ 2097.548524]  [<ffffffff8107001b>] async_run_entry_fn+0x3b/0x140
> [ 2097.548529]  [<ffffffff810626ae>] process_one_work+0x16e/0x3f0
> [ 2097.548534]  [<ffffffff81062dc2>] worker_thread+0x122/0x370
> [ 2097.548540]  [<ffffffff81062ca0>] ? rescuer_thread+0x330/0x330
> [ 2097.548544]  [<ffffffff810695e0>] kthread+0xc0/0xd0
> [ 2097.548549]  [<ffffffff81069520>] ? kthread_create_on_node+0x130/0x130
> [ 2097.548553]  [<ffffffff8169f81c>] ret_from_fork+0x7c/0xb0
> [ 2097.548558]  [<ffffffff81069520>] ? kthread_create_on_node+0x130/0x130
> [ 2097.548560] ---[ end trace 989c661118e428a9 ]---
>
> -- Shuah
>
> Shuah Khan, Linux Kernel Developer - Open Source Group Samsung Research
> America (Silicon Valley) shuah.kh@...sung.com | (970) 672-0658
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