[Bug 85220] [BDW]igt/kms_flip some subcases cause "[drm:hsw_unclaimed_reg_detect.isra.6 [i915]] *ERROR* Unclaimed register detected. Please use the i915.mmio_debug=1 to debug this problem."

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=85220

--- Comment #1 from Guo Jinxian <jinxianx.guo at intel.com> ---
With "i915.mmio_debug=1",dmesg error shows below:

"root at x-bdw05:/GFX/Test/Intel_gpu_tools/intel-gpu-tools/tests# ./kms_flip
--run-subtest vblank-vs-modeset-suspend-interruptible
IGT-Version: 1.8-gbba1cd0 (x86_64) (Linux:
3.17.0_drm-intel-nightly_8d1dbe_20141020+ x86_64)
Using monotonic timestamps
Beginning vblank-vs-modeset-suspend-interruptible on crtc 8, connector 19
  1920x1080 60 1920 1966 1996 2080 1080 1082 1086 1112 0xa 0x48 138780
.rtcwake: wakeup from ""mem"" using /dev/rtc0 at Mon Oct 20 19:14:13 2014
.rtcwake: wakeup from ""mem"" using /dev/rtc0 at Mon Oct 20 19:14:45 2014

vblank-vs-modeset-suspend-interruptible on crtc 8, connector 19: PASSED

Beginning vblank-vs-modeset-suspend-interruptible on crtc 12, connector 19
  1920x1080 60 1920 1966 1996 2080 1080 1082 1086 1112 0xa 0x48 138780
.rtcwake: wakeup from ""mem"" using /dev/rtc0 at Mon Oct 20 19:15:17 2014
.rtcwake: wakeup from ""mem"" using /dev/rtc0 at Mon Oct 20 19:15:49 2014

vblank-vs-modeset-suspend-interruptible on crtc 12, connector 19: PASSED

Beginning vblank-vs-modeset-suspend-interruptible on crtc 16, connector 19
  1920x1080 60 1920 1966 1996 2080 1080 1082 1086 1112 0xa 0x48 138780
.rtcwake: wakeup from ""mem"" using /dev/rtc0 at Mon Oct 20 19:16:21 2014
.rtcwake: wakeup from ""mem"" using /dev/rtc0 at Mon Oct 20 19:16:53 2014

vblank-vs-modeset-suspend-interruptible on crtc 16, connector 19: PASSED

Subtest vblank-vs-modeset-suspend-interruptible: SUCCESS (11.066s)
root at x-bdw05:/GFX/Test/Intel_gpu_tools/intel-gpu-tools/tests# dmesg -r|egrep
""<[1-4]>""|grep drm         <4>[  112.194529] WARNING: CPU: 0 PID: 2666 at
drivers/gpu/drm/i915/intel_uncore.c:525
hsw_unclaimed_reg_debug.isra.10+0x62/0x72 [i915]()
<4>[  112.194541] Modules linked in: dm_mod iTCO_wdt iTCO_vendor_support ppdev
pcspkr snd_hda_codec_hdmi i2c_i801 lpc_ich mfd_core snd_hda_intel
snd_hda_controller snd_hda_codec snd_hwdep snd_pcm snd_timer snd soundcore
battery parport_pc parport ac acpi_cpufreq i915 button video drm_kms_helper drm
cfbfillrect cfbimgblt cfbcopyarea
<4>[  112.194544] CPU: 0 PID: 2666 Comm: kworker/0:2 Tainted: G        W     
3.17.0_drm-intel-nightly_8d1dbe_20141020+ #678
<4>[  114.051239] WARNING: CPU: 3 PID: 4636 at
drivers/gpu/drm/i915/intel_uncore.c:525
hsw_unclaimed_reg_debug.isra.10+0x62/0x72 [i915]()
<4>[  114.051257] Modules linked in: dm_mod iTCO_wdt iTCO_vendor_support ppdev
pcspkr snd_hda_codec_hdmi i2c_i801 lpc_ich mfd_core snd_hda_intel
snd_hda_controller snd_hda_codec snd_hwdep snd_pcm snd_timer snd soundcore
battery parport_pc parport ac acpi_cpufreq i915 button video drm_kms_helper drm
cfbfillrect cfbimgblt cfbcopyarea
<4>[  114.051260] CPU: 3 PID: 4636 Comm: kworker/u16:22 Tainted: G        W    
 3.17.0_drm-intel-nightly_8d1dbe_20141020+ #678
<4>[  114.051385]  [<ffffffffa007d39b>] ? i915_drm_thaw_early+0x15/0x4f [i915]
<4>[  115.882932] WARNING: CPU: 3 PID: 4623 at
drivers/gpu/drm/i915/intel_uncore.c:525
hsw_unclaimed_reg_debug.isra.10+0x62/0x72 [i915]()
<4>[  115.882950] Modules linked in: dm_mod iTCO_wdt iTCO_vendor_support ppdev
pcspkr snd_hda_codec_hdmi i2c_i801 lpc_ich mfd_core snd_hda_intel
snd_hda_controller snd_hda_codec snd_hwdep snd_pcm snd_timer snd soundcore
battery parport_pc parport ac acpi_cpufreq i915 button video drm_kms_helper drm
cfbfillrect cfbimgblt cfbcopyarea
<4>[  115.882953] CPU: 3 PID: 4623 Comm: kworker/u16:11 Tainted: G        W    
 3.17.0_drm-intel-nightly_8d1dbe_20141020+ #678
<4>[  115.883071]  [<ffffffffa007d39b>] ? i915_drm_thaw_early+0x15/0x4f [i915]
<4>[  117.934572] WARNING: CPU: 0 PID: 4646 at
drivers/gpu/drm/i915/intel_uncore.c:525
hsw_unclaimed_reg_debug.isra.10+0x62/0x72 [i915]()
<4>[  117.934584] Modules linked in: dm_mod iTCO_wdt iTCO_vendor_support ppdev
pcspkr snd_hda_codec_hdmi i2c_i801 lpc_ich mfd_core snd_hda_intel
snd_hda_controller snd_hda_codec snd_hwdep snd_pcm snd_timer snd soundcore
battery parport_pc parport ac acpi_cpufreq i915 button video drm_kms_helper drm
cfbfillrect cfbimgblt cfbcopyarea
<4>[  117.934587] CPU: 0 PID: 4646 Comm: kworker/u16:32 Tainted: G        W    
 3.17.0_drm-intel-nightly_8d1dbe_20141020+ #678
<4>[  117.934683]  [<ffffffffa007d39b>] ? i915_drm_thaw_early+0x15/0x4f [i915]
<4>[  119.788136] WARNING: CPU: 1 PID: 4630 at
drivers/gpu/drm/i915/intel_uncore.c:525
hsw_unclaimed_reg_debug.isra.10+0x62/0x72 [i915]()
<4>[  119.788153] Modules linked in: dm_mod iTCO_wdt iTCO_vendor_support ppdev
pcspkr snd_hda_codec_hdmi i2c_i801 lpc_ich mfd_core snd_hda_intel
snd_hda_controller snd_hda_codec snd_hwdep snd_pcm snd_timer snd soundcore
battery parport_pc parport ac acpi_cpufreq i915 button video drm_kms_helper drm
cfbfillrect cfbimgblt cfbcopyarea
<4>[  119.788157] CPU: 1 PID: 4630 Comm: kworker/u16:16 Tainted: G        W    
 3.17.0_drm-intel-nightly_8d1dbe_20141020+ #678
<4>[  119.788283]  [<ffffffffa007d39b>] ? i915_drm_thaw_early+0x15/0x4f [i915]
"

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