[Intel-gfx] DC6 already programmed to be disabled

[Konduru, Chandra]

Hi,
I have been seeing below warning on skylake system on which dmc fw isn't placed.
Is below warning expected? If so what is it conveying?

-Chandra

May 15 15:53:53 cmkondur-skl kernel: [19587.475013] WARNING: CPU: 0 PID: 1453 at /home/cmkondur/otc/otc_kernel/drivers/gpu/drm/i915/intel_runtime_pm.c:532 skl_set_power_well+0x74b/0xab0 [i915]()
May 15 15:53:53 cmkondur-skl kernel: [19587.475014] DC6 already programmed to be disabled.
May 15 15:53:53 cmkondur-skl kernel: [19587.475015] Modules linked in: i915(OE) drm_kms_helper(OE) drm(OE) video(E) i2c_algo_bit(E) xhci_plat_hcd(E) snd_hda_intel(E) snd_hda_codec(E) snd_hda_core(E) snd_hwdep(E) snd_pcm_oss(E) snd_mixer_oss(E) snd_pcm(E) dwc3(E) udc_core(E) snd_seq_midi(E) snd_rawmidi(E) intel_rapl(E) snd_seq_midi_event(E) iosf_mbi(E) x86_pkg_temp_thermal(E) coretemp(E) snd_seq(E) kvm_intel(E) kvm(E) crct10dif_pclmul(E) crc32_pclmul(E) rfcomm(E) bnep(E) ghash_clmulni_intel(E) bluetooth(E) snd_timer(E) snd_seq_device(E) aesni_intel(E) ablk_helper(E) cryptd(E) lrw(E) gf128mul(E) glue_helper(E) aes_x86_64(E) asix(E) usbnet(E) mii(E) snd(E) mac_hid(E) serio_raw(E) nls_iso8859_1(E) soundcore(E) dwc3_pci(E) parport_pc(E) ppdev(E) lp(E) parport(E) hid_generic(E) usbhid(E) hid(E) e1000e(E) ptp(E) ahci(E) psmouse(E) pps_core(E) sdhci_pci(E) sdhci(E) libahci(E)
May 15 15:53:53 cmkondur-skl kernel: [19587.475041] CPU: 0 PID: 1453 Comm: kms_nv12 Tainted: G        W  OE   4.1.0-rc2+ #2
May 15 15:53:53 cmkondur-skl kernel: [19587.475042] Hardware name: Intel Corporation Skylake Client platform/Skylake Y LPDDR3 RVP3, BIOS SKLSE2R1.86C.X075.R04.1503240732 03/24/2015
May 15 15:53:53 cmkondur-skl kernel: [19587.475043]  0000000000000214 ffff880075547a68 ffffffff817dc684 0000000000000007
May 15 15:53:53 cmkondur-skl kernel: [19587.475045]  ffff880075547ab8 ffff880075547aa8 ffffffff8107c557 000000003000000f
May 15 15:53:53 cmkondur-skl kernel: [19587.475047]  ffff8800755e0000 0000000040000000 ffffffffc05897f0 000000003000000f
May 15 15:53:53 cmkondur-skl kernel: [19587.475048] Call Trace:
May 15 15:53:53 cmkondur-skl kernel: [19587.475050]  [<ffffffff817dc684>] dump_stack+0x45/0x57
May 15 15:53:53 cmkondur-skl kernel: [19587.475052]  [<ffffffff8107c557>] warn_slowpath_common+0x97/0xe0
May 15 15:53:53 cmkondur-skl kernel: [19587.475054]  [<ffffffff8107c656>] warn_slowpath_fmt+0x46/0x50
May 15 15:53:53 cmkondur-skl kernel: [19587.475062]  [<ffffffffc04ad40b>] skl_set_power_well+0x74b/0xab0 [i915]
May 15 15:53:53 cmkondur-skl kernel: [19587.475071]  [<ffffffffc04ad7a3>] skl_power_well_enable+0x13/0x20 [i915]
May 15 15:53:53 cmkondur-skl kernel: [19587.475079]  [<ffffffffc04ada6e>] intel_display_power_get+0x9e/0xf0 [i915]
May 15 15:53:53 cmkondur-skl kernel: [19587.475095]  [<ffffffffc0536c51>] intel_dp_detect+0xb1/0x510 [i915]
May 15 15:53:53 cmkondur-skl kernel: [19587.475099]  [<ffffffffc047dc10>] drm_helper_probe_single_connector_modes_merge_bits+0x200/0x4f0 [drm_kms_helper]
May 15 15:53:53 cmkondur-skl kernel: [19587.475108]  [<ffffffffc0400953>] ? _object_find+0x93/0xd0 [drm]
May 15 15:53:53 cmkondur-skl kernel: [19587.475112]  [<ffffffffc047df33>] drm_helper_probe_single_connector_modes+0x13/0x20 [drm_kms_helper]
May 15 15:53:53 cmkondur-skl kernel: [19587.475121]  [<ffffffffc0404b9f>] drm_mode_getconnector+0x3af/0x400 [drm]
May 15 15:53:53 cmkondur-skl kernel: [19587.475124]  [<ffffffff817d8350>] ? printk+0x46/0x48
May 15 15:53:53 cmkondur-skl kernel: [19587.475130]  [<ffffffffc03f5cb2>] drm_ioctl+0x362/0x690 [drm]
May 15 15:53:53 cmkondur-skl kernel: [19587.475139]  [<ffffffffc04047f0>] ? drm_mode_getcrtc+0x150/0x150 [drm]
May 15 15:53:53 cmkondur-skl kernel: [19587.475141]  [<ffffffff81211406>] do_vfs_ioctl+0x86/0x530
May 15 15:53:53 cmkondur-skl kernel: [19587.475144]  [<ffffffff8121e7c4>] ? mntput+0x24/0x40
May 15 15:53:53 cmkondur-skl kernel: [19587.475146]  [<ffffffff811ffe80>] ? __fput+0x170/0x250
May 15 15:53:53 cmkondur-skl kernel: [19587.475148]  [<ffffffff81211941>] SyS_ioctl+0x91/0xb0
May 15 15:53:53 cmkondur-skl kernel: [19587.475150]  [<ffffffff817e4672>] system_call_fastpath+0x16/0x75
May 15 15:53:53 cmkondur-skl kernel: [19587.475151] ---[ end trace cd9e938b57041455 ]---
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