[Bug 87086] New: [BSW]S3 causes "WARNING: CPU: 1 PID: 4478 at drivers/gpu/drm/i915/i915_drv.c:1185 vlv_force_gfx_clock+0x41/0x1eb [i915]()"

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=87086

            Bug ID: 87086
           Summary: [BSW]S3 causes "WARNING: CPU: 1 PID: 4478 at
                    drivers/gpu/drm/i915/i915_drv.c:1185
                    vlv_force_gfx_clock+0x41/0x1eb [i915]()"
           Product: DRI
           Version: DRI git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: jinxianx.guo at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 110550
  --> https://bugs.freedesktop.org/attachment.cgi?id=110550&action=edit
dmesg

==System Environment==
--------------------------
Regression: Not sure.
Here has another bug 84903 about S3

Non-working platforms: BSW

==kernel==
--------------------------
origin/drm-intel-nightly: 2014_12_07(fails)

==Bug detailed description==
-----------------------------
S3 causes "WARNING: CPU: 1 PID: 4478 at drivers/gpu/drm/i915/i915_drv.c:1185
vlv_force_gfx_clock+0x41/0x1eb [i915]()"

Commit 2d3d111a8f34606469e589d3491c9a64f62310b8 fixed bug 84903, and involved
this call trace.
Author: Ville Syrjälä <ville.syrjala at linux.intel.com>
Date:   Fri Nov 21 21:00:36 2014 +0200

drm/i915: Don't clobber crtc->new_config when nothing changes


Dmesg:
------------[ cut here ]------------
[  532.651288] WARNING: CPU: 1 PID: 4478 at
drivers/gpu/drm/i915/i915_drv.c:1185 vlv_force_gfx_clock+0x41/0x1eb [i915]()
[  532.651291] WARN_ON(!!(val & VLV_GFX_CLK_FORCE_ON_BIT) == force_on)
[  532.651321] Modules linked in: dm_mod iTCO_wdt iTCO_vendor_support
snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic snd_hda_intel
snd_hda_controller pcspkr snd_hda_codec serio_raw snd_hwdep snd_pcm snd_timer
i2c_i801 lpc_ich snd mfd_core soundcore battery ac acpi_cpufreq option usb_wwan
usbserial i915 button video drm_kms_helper drm cfbfillrect cfbimgblt
cfbcopyarea
[  532.651328] CPU: 1 PID: 4478 Comm: kworker/u8:54 Tainted: G        W     
3.18.0-rc5_kcloud_2d3d11_20141202+ #40
[  532.651338] Workqueue: events_unbound async_run_entry_fn
[  532.651343]  0000000000000000 0000000000000009 ffffffff817788a0
ffff8801757afc98
[  532.651347]  ffffffff81036742 ffff8801757afc90 ffffffffa007ea40
ffff8801757ac000
[  532.651351]  ffff880175b00000 0000000000000000 ffff88017a5c8800
00000000ffffff92
[  532.651353] Call Trace:
[  532.651363]  [<ffffffff817788a0>] ? dump_stack+0x41/0x51
[  532.651370]  [<ffffffff81036742>] ? warn_slowpath_common+0x78/0x90
[  532.651397]  [<ffffffffa007ea40>] ? vlv_force_gfx_clock+0x41/0x1eb [i915]
[  532.651402]  [<ffffffff8103679f>] ? warn_slowpath_fmt+0x45/0x4a
[  532.651431]  [<ffffffffa007ea40>] ? vlv_force_gfx_clock+0x41/0x1eb [i915]
[  532.651458]  [<ffffffffa007f9ea>] ? vlv_resume_prepare+0x511/0x546 [i915]
[  532.651485]  [<ffffffffa007fad8>] ? i915_resume_legacy+0x23/0x23 [i915]
[  532.651512]  [<ffffffffa007fa59>] ? i915_drm_resume_early+0x3a/0x96 [i915]
[  532.651518]  [<ffffffff813dd359>] ? dpm_run_callback+0x3a/0xc5
[  532.651522]  [<ffffffff813dd6b5>] ? device_resume_early+0x130/0x171
[  532.651526]  [<ffffffff813dd70a>] ? async_resume_early+0x14/0x38
[  532.651532]  [<ffffffff8104cfd7>] ? async_run_entry_fn+0x2d/0xbf
[  532.651537]  [<ffffffff810473f9>] ? process_one_work+0x1b3/0x316
[  532.651541]  [<ffffffff81047da1>] ? worker_thread+0x27d/0x369
[  532.651545]  [<ffffffff81047b24>] ? rescuer_thread+0x219/0x219
[  532.651550]  [<ffffffff8104b375>] ? kthread+0xce/0xd6
[  532.651554]  [<ffffffff8104b2a7>] ? kthread_create_on_node+0x162/0x162
[  532.651560]  [<ffffffff8177de2c>] ? ret_from_fork+0x7c/0xb0
[  532.651564]  [<ffffffff8104b2a7>] ? kthread_create_on_node+0x162/0x162
[  532.651567] ---[ end trace c5048bcdf86a84e4 ]---


==Reproduce steps==
---------------------------- 
1. echo mem > /sys/power/state

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