[Bug 90237] [SKL] State checker doesn't handle modes with DRM_MODE_FLAG_DBLCLK properly

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90237

--- Comment #10 from cprigent <christophe.prigent at intel.com> ---
Logs from Rami contains:

[  415.734060] ------------[ cut here ]------------
[  415.734093] WARNING: CPU: 0 PID: 2912 at
drivers/gpu/drm/i915/intel_pm.c:3666 skl_update_other_pipe_wm+0x12e/0x16e
[i915]()
[  415.734096] WARN_ON(!wm_changed)
[  415.734157] Modules linked in: snd_hda_codec_hdmi snd_hda_codec_realtek
snd_hda_codec_generic snd_hda_intel snd_hda_codec snd_hda_core snd_hwdep
snd_pcm_oss snd_mixer_oss x86_pkg_temp_thermal snd_pcm coretemp kvm_intel
snd_seq_dummy kvm snd_seq_oss microcode snd_seq_midi asix usbnet serio_raw
joydev input_leds snd_rawmidi snd_seq_midi_event snd_seq snd_seq_device
snd_timer snd i915 soundcore drm_kms_helper syscopyarea sysfillrect sysimgblt
fb_sys_fops drm shpchp wmi ipv6 bnep rfcomm bluetooth battery rfkill video ac
parport_pc button acpi_cpufreq ppdev lp parport sdhci_pci sdhci led_class
mmc_core
[  415.734162] CPU: 0 PID: 2912 Comm: testdisplay Tainted: G        W      
4.2.0-rc4-drm-intel-nightly-ww32+ #1
[  415.734164] Hardware name: Intel Corporation Skylake Client platform/Skylake
Y LPDDR3 RVP3, BIOS SKLSE2R1.R00.X093.B02.1507222151 07/22/2015
[  415.734171]  0000000000000009 ffff88016adb73c8 ffffffff81896b51
0000000000000000
[  415.734175]  ffff88016adb7418 ffff88016adb7408 ffffffff810467c3
ffff88016adb75e5
[  415.734179]  ffffffffa0315e0e ffff88016cb2d000 ffff880086ff4000
ffff88016cb2c000
[  415.734180] Call Trace:
[  415.734190]  [<ffffffff81896b51>] dump_stack+0x45/0x57
[  415.734196]  [<ffffffff810467c3>] warn_slowpath_common+0xa1/0xbb
[  415.734226]  [<ffffffffa0315e0e>] ? skl_update_other_pipe_wm+0x12e/0x16e
[i915]
[  415.734230]  [<ffffffff81046823>] warn_slowpath_fmt+0x46/0x48
[  415.734259]  [<ffffffffa0315e0e>] skl_update_other_pipe_wm+0x12e/0x16e
[i915]
[  415.734289]  [<ffffffffa0315fa2>] skl_update_wm+0x154/0x6d1 [i915]
[  415.734295]  [<ffffffff81086adf>] ? mark_held_locks+0x58/0x6e
[  415.734300]  [<ffffffff8189f621>] ? retint_kernel+0x10/0x10
[  415.734331]  [<ffffffffa03172a8>] intel_update_watermarks+0x1e/0x20 [i915]
[  415.734381]  [<ffffffffa036890d>] haswell_crtc_enable+0x5c9/0xaaa [i915]
[  415.734426]  [<ffffffffa036d595>] intel_atomic_commit+0x411/0x5cd [i915]
[  415.734460]  [<ffffffffa027699c>] drm_atomic_commit+0x4d/0x52 [drm]
[  415.734474]  [<ffffffffa02e39f2>] drm_atomic_helper_set_config+0x316/0x371
[drm_kms_helper]
[  415.734486]  [<ffffffffa02e3b64>] ?
drm_atomic_helper_plane_set_property+0x6c/0xab [drm_kms_helper]
[  415.734511]  [<ffffffffa02682e0>] drm_mode_set_config_internal+0x5c/0xf7
[drm]
[  415.734523]  [<ffffffffa02e5408>] restore_fbdev_mode+0xbb/0xd5
[drm_kms_helper]
[  415.734535]  [<ffffffffa02e6a3e>]
drm_fb_helper_restore_fbdev_mode_unlocked+0x27/0x5e [drm_kms_helper]
[  415.734545]  [<ffffffffa02e6ab4>] drm_fb_helper_set_par+0x3f/0x4b
[drm_kms_helper]
[  415.734590]  [<ffffffffa037a203>] intel_fbdev_set_par+0x1a/0x5c [i915]
[  415.734597]  [<ffffffff8141cc03>] fb_set_var+0x2aa/0x3a0
[  415.734603]  [<ffffffff81414d61>] fbcon_blank+0x89/0x251
[  415.734609]  [<ffffffff81086adf>] ? mark_held_locks+0x58/0x6e
[  415.734615]  [<ffffffff814741ed>] do_unblank_screen+0xfa/0x173
[  415.734620]  [<ffffffff8146bd3b>] vt_ioctl+0x546/0x10f3
[  415.734625]  [<ffffffff814615ae>] tty_ioctl+0xbe7/0xc63
[  415.734630]  [<ffffffff81172896>] ? __fd_install+0x19a/0x1bf
[  415.734634]  [<ffffffff8114fe6a>] ? kmem_cache_free+0xeb/0x1ba
[  415.734637]  [<ffffffff81164fae>] ? putname+0x4a/0x4e
[  415.734642]  [<ffffffff81086c63>] ? trace_hardirqs_on_caller+0x16e/0x18a
[  415.734646]  [<ffffffff811681e8>] do_vfs_ioctl+0x41c/0x4e7
[  415.734649]  [<ffffffff81164fae>] ? putname+0x4a/0x4e
[  415.734652]  [<ffffffff811720c9>] ? __fget_light+0x50/0x75
[  415.734655]  [<ffffffff81168306>] SyS_ioctl+0x53/0x81
[  415.734660]  [<ffffffff8189ea97>] entry_SYSCALL_64_fastpath+0x12/0x6f
[  415.734663] ---[ end trace 23e364efca4427fa ]---

Should we report another bug and close this one?

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