[Bug 84164] New: [BYT Bisected]igt/kms_render/direct-render and gpu-blit cause "WARNING: CPU: 1 PID: 17633 at drivers/gpu/drm/i915/intel_display.c:1746 vlv_wait_port_ready+0xe5/0x11e [i915]()"

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=84164

          Priority: high
            Bug ID: 84164
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [BYT Bisected]igt/kms_render/direct-render and
                    gpu-blit cause "WARNING: CPU: 1 PID: 17633 at
                    drivers/gpu/drm/i915/intel_display.c:1746
                    vlv_wait_port_ready+0xe5/0x11e [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

==System Environment==
--------------------------
Regression: Yes.

Non-working platforms: BYT

==kernel==
--------------------------
origin/drm-intel-nightly:c5660b4ad395f1e34eacc22cf81c687edfc9c83c(fails)
    drm-intel-nightly: 2014y-09m-19d-18h-12m-22s UTC integration manifest

==Bug detailed description==
-----------------------------
igt/kms_render/direct-render and gpu-blit cause "WARNING: CPU: 1 PID: 17633 at
drivers/gpu/drm/i915/intel_display.c:1746 vlv_wait_port_ready+0xe5/0x11e
[i915]()"

Dmesg:
[ 2132.759240] WARNING: CPU: 1 PID: 17633 at
drivers/gpu/drm/i915/intel_display.c:1746 vlv_wait_port_ready+0xe5/0x11e
[i915]()
[ 2132.759245] timed out waiting for port C ready: 0x000020ff
[ 2132.759249] Modules linked in: ip6table_filter ip6_tables ipv6
iptable_filter ip_tables ebtable_nat ebtables x_tables dm_mod
snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic iTCO_wdt
iTCO_vendor_support snd_hda_intel snd_hda_controller serio_raw pcspkr
snd_hda_codec snd_hwdep snd_pcm snd_timer i2c_i801 lpc_ich mfd_core snd
soundcore iosf_mbi battery ac acpi_cpufreq i915 button video drm_kms_helper drm
[ 2132.759316] CPU: 1 PID: 17633 Comm: kms_render Tainted: G W
3.17.0-rc5_prts_ab7f1a_20140917_debug+ #28
[ 2132.759321] 0000000000000000 ffff880074aafa60 ffffffff8181608c
ffff880074aafaa8
[ 2132.759331] ffff880074aafa98 ffffffff8103e87f ffffffffa00cf6db
ffff880003650000
[ 2132.759340] 00000000000000f0 0000000000186014 ffff880075935000
ffff880074aafaf8
[ 2132.759349] Call Trace:
[ 2132.759361] [] dump_stack+0x45/0x56
[ 2132.759370] [] warn_slowpath_common+0x7f/0x98
[ 2132.759413] [] ? vlv_wait_port_ready+0xe5/0x11e [i915]
[ 2132.759420] [] warn_slowpath_fmt+0x4c/0x4e
[ 2132.759464] [] vlv_wait_port_ready+0xe5/0x11e [i915]
[ 2132.759508] [] vlv_pre_enable_dp+0x10a/0x115 [i915]
[ 2132.759550] [] valleyview_crtc_enable+0xa33/0xae2 [i915]
[ 2132.759593] [] __intel_set_mode+0xc77/0x127f [i915]
[ 2132.759602] [] ? trace_hardirqs_on_caller+0x16e/0x18a
[ 2132.759644] [] intel_set_mode+0x14/0x2a [i915]
[ 2132.759687] [] intel_crtc_set_config+0x9b6/0xa9f [i915]
[ 2132.759713] [] drm_mode_set_config_internal+0x55/0xe0 [drm]
[ 2132.759738] [] drm_mode_setcrtc+0x39e/0x498 [drm]
[ 2132.759759] [] drm_ioctl+0x385/0x404 [drm]
[ 2132.759783] [] ? drm_mode_setplane+0x1d8/0x1d8 [drm]
[ 2132.759792] [] ? mntput_no_expire+0x5/0x1af
[ 2132.759800] [] do_vfs_ioctl+0x3a3/0x46c
[ 2132.759808] [] ? current_kernel_time+0x61/0x9a
[ 2132.759816] [] ? trace_hardirqs_on_caller+0x16e/0x18a
[ 2132.759823] [] SyS_ioctl+0x50/0x7d
[ 2132.759831] [] system_call_fastpath+0x16/0x1b
[ 2132.759835] ---[ end trace 271f8fc0a83a07a6 ]---
[ 2132.901162] [drm:i9xx_set_fifo_underrun_reporting] *ERROR* pipe B underrun
[ 2132.901171] [drm:valleyview_pipestat_irq_handler] *ERROR* pipe B underrun
[ 2133.628905] [drm:intel_dp_complete_link_train] *ERROR* failed to train DP,
aborting
[ 2134.462175] [drm:intel_dp_complete_link_train] *ERROR* failed to train DP,
aborting", 

==Reproduce steps==
---------------------------- 
1. ./kms_render --run-subtest direct-render

==Bisect results form [PRTS][auto-bisect]==
----------------------------
commit f81d8eba4fb4448e6ea777aa2072c3b9f277e7cb
Author:     Chris Wilson <chris at chris-wilson.co.uk>
AuthorDate: Fri Sep 12 09:11:55 2014 +0100
Commit:     Chris Wilson <chris at chris-wilson.co.uk>
CommitDate: Fri Sep 12 09:12:42 2014 +0100

    igt/kms_render: Iterate only through the formats

    When testing each format, iterate through the formats and not randomly
    through the modes.

    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=83788
    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>

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