[Bug 82892] New: [HSW]igt/kms_setmode/clone-exclusive-crtc causes "WARNING: CPU: 3 PID: 20000 at drivers/gpu/drm/i915/intel_ddi.c:1531 intel_ddi_compute_config+0x39/0x6c [i915]()"

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=82892

          Priority: medium
            Bug ID: 82892
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [HSW]igt/kms_setmode/clone-exclusive-crtc causes
                    "WARNING: CPU: 3 PID: 20000 at
                    drivers/gpu/drm/i915/intel_ddi.c:1531
                    intel_ddi_compute_config+0x39/0x6c [i915]()"
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: jinxianx.guo at intel.com
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 105004
  --> https://bugs.freedesktop.org/attachment.cgi?id=105004&action=edit
dmesg

==System Environment==
--------------------------
Regression: Not sure.
I didn't find good commit on both kernel and i-g-t.

Non-working platforms: HSW

==kernel==
--------------------------
origin/drm-intel-nightly: 49ceddc7b3b0e3f7eb21b9fb4c9b840cff630047(fails)
    drm-intel-nightly: 2014y-08m-19d-19h-02m-49s integration manifest
origin/drm-intel-next-queued: 3f72c7b12f1a81a32fd37216b3382e6fe46a7184(fails)
    drm/i915/bdw: Disable execlists by default
origin/drm-intel-fixes: 1a125d8a2c22b11741fc47d4ffcf7a5ffa044dd3(fails)
    drm/i915: don't try to retrain a DP link on an inactive CRTC

==Bug detailed description==
-----------------------------
igt/kms_setmode/clone-exclusive-crtc causes "WARNING: CPU: 3 PID: 20000 at
drivers/gpu/drm/i915/intel_ddi.c:1531 intel_ddi_compute_config+0x39/0x6c
[i915]()"

Output:
[root at x-hsw24 tests]# ./kms_setmode --run-subtest clone-exclusive-crtc
IGT-Version: 1.7-g4d2f511 (x86_64) (Linux:
3.17.0-rc1_drm-intel-nightly_49cedd_20140821+ x86_64)
Testing: clone-exclusive-crtc 2 connector combinations
  Test id#1 CRTC count 2
    CRTC[7] [Pipe A] Mode: 640x480 at 60Hz Connectors: VGA-1[18] (NC)
    CRTC[12] [Pipe B] Mode: 640x480 at 60Hz Connectors: HDMI-A-1[27] (NC)
Test assertion failure function test_crtc_config, file kms_setmode.c:433:
Failed assertion: config_failed == !!(tconf->flags & TEST_INVALID)
Last errno: 22, Invalid argument
Subtest clone-exclusive-crtc: FAIL
[root at x-hsw24 tests]# dmesg -r|egrep ""<[1-4]>""|grep drm
<4>[  143.879861] WARNING: CPU: 3 PID: 20000 at
drivers/gpu/drm/i915/intel_ddi.c:1531 intel_ddi_compute_config+0x39/0x6c
[i915]()
<4>[  143.879863] Modules linked in: ip6table_filter ip6_tables ipv6
iptable_filter ip_tables ebtable_nat ebtables x_tables dm_mod
snd_hda_codec_realtek snd_hda_codec_generic snd_hda_codec_hdmi iTCO_wdt
iTCO_vendor_support dcdbas serio_raw pcspkr i2c_i801 snd_hda_intel
snd_hda_controller snd_hda_codec lpc_ich snd_hwdep mfd_core shpchp snd_pcm
snd_timer snd soundcore battery acpi_cpufreq i915 button video drm_kms_helper
drm cfbfillrect cfbimgblt cfbcopyarea
<4>[  143.879876] CPU: 3 PID: 20000 Comm: kms_setmode Not tainted
3.17.0-rc1_drm-intel-nightly_49cedd_20140821+ #1652
<4>[  143.879934]  [<ffffffffa00181c9>] ?
drm_mode_set_config_internal+0x48/0xbd [drm]
<4>[  143.879938]  [<ffffffffa001bbe4>] ? drm_mode_setcrtc+0x3e6/0x48b [drm]
<4>[  143.879942]  [<ffffffffa0010908>] ? drm_ioctl+0x279/0x3bc [drm]
<4>[  143.879948]  [<ffffffffa001b7fe>] ? drm_mode_setplane+0x16d/0x16d [drm]
<4>[  143.879952]  [<ffffffffa000fda3>] ? drm_gem_vm_close+0x2a/0x4b [drm]
<4>[  143.879969] WARNING: CPU: 3 PID: 20000 at
drivers/gpu/drm/i915/intel_dp.c:137 intel_dp_max_link_bw+0x6f/0x77 [i915]()
<4>[  143.879971] Modules linked in: ip6table_filter ip6_tables ipv6
iptable_filter ip_tables ebtable_nat ebtables x_tables dm_mod
snd_hda_codec_realtek snd_hda_codec_generic snd_hda_codec_hdmi iTCO_wdt
iTCO_vendor_support dcdbas serio_raw pcspkr i2c_i801 snd_hda_intel
snd_hda_controller snd_hda_codec lpc_ich snd_hwdep mfd_core shpchp snd_pcm
snd_timer snd soundcore battery acpi_cpufreq i915 button video drm_kms_helper
drm cfbfillrect cfbimgblt cfbcopyarea
<4>[  143.879981] CPU: 3 PID: 20000 Comm: kms_setmode Tainted: G        W     
3.17.0-rc1_drm-intel-nightly_49cedd_20140821+ #1652
<4>[  143.880040]  [<ffffffffa00181c9>] ?
drm_mode_set_config_internal+0x48/0xbd [drm]
<4>[  143.880044]  [<ffffffffa001bbe4>] ? drm_mode_setcrtc+0x3e6/0x48b [drm]
<4>[  143.880047]  [<ffffffffa0010908>] ? drm_ioctl+0x279/0x3bc [drm]
<4>[  143.880053]  [<ffffffffa001b7fe>] ? drm_mode_setplane+0x16d/0x16d [drm]
<4>[  143.880056]  [<ffffffffa000fda3>] ? drm_gem_vm_close+0x2a/0x4b [drm]


==Reproduce steps==
---------------------------- 
1. ./kms_setmode --run-subtest clone-exclusive-crtc

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