[Bug 70270] New: [Baytrail-M Regression VGA] machine boot up with Call Trace

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=70270

          Priority: medium
            Bug ID: 70270
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [Baytrail-M Regression VGA] machine boot up with Call
                    Trace
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: major
    Classification: Unclassified
                OS: All
          Reporter: yangweix.shui at intel.com
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 87264
  --> https://bugs.freedesktop.org/attachment.cgi?id=87264&action=edit
dmesg: boot up call trace with VGA pipe

Description:
-----------------------
If VGA plugged in, machine boot up with call trace. I also tried only eDP
plugged, there's no this issue. 


Bisect Result:
-----------------------
1d5b80e5bcd2cb7333bbc1fa8abb8c5a55a870b5 is the first bad commit
commit 1d5b80e5bcd2cb7333bbc1fa8abb8c5a55a870b5
Author: Jani Nikula <jani.nikula at intel.com>
Date:   Sat Oct 5 16:13:56 2013 +0300

    drm/i915/dp: promote clock recovery failures to DRM_ERROR

    If channel equalization succeeds, there's no indication something went
    wrong in clock recovery (unless debug is enabled). We should shout about
    the failures and fix them instead of hiding them under the carpet.

    This has allowed bugs like [1] stay dormant for a long time.

    [1] https://bugs.freedesktop.org/show_bug.cgi?id=70117

    Signed-off-by: Jani Nikula <jani.nikula at intel.com>
    Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>

:040000 040000 81194e365f1abc4f55222044b892f5391ecf05fe
e6ac8f1eb807dc1fba4efac4914b1b84f0f0e9bb M    drivers


Call Trace:
--------------------------
[    2.494129] [drm:i9xx_crtc_clock_get], Unknown DPLL mode 00000000 in
programmed mod
e
[    2.494133] [drm:intel_pipe_config_compare] *ERROR* mismatch in clock
(expected 148
500, found 0)
[    2.494134] ------------[ cut here ]------------
[    2.494172] WARNING: CPU: 1 PID: 1172 at
drivers/gpu/drm/i915/intel_display.c:8769
check_crtc_state+0x6ea/0x73b [i915]()
[    2.494173] pipe state doesn't match!
[    2.494180] Modules linked in: i915(+) drm_kms_helper drm video button
[    2.494184] CPU: 1 PID: 1172 Comm: systemd-udevd Not tainted
3.12.0-rc1_drm-intel-n
ext-queued_e04a0a_20131008+ #1
[    2.494186] Hardware name: Intel Corp. VALLEYVIEW B2 PLATFORM/NOTEBOOK, BIOS
BBAYCR
B1.X64.0055.R31.1308081542 BBAY_X64_R_V0055_31 08/08/2013
[    2.494191]  0000000000000009 ffff880178ba1048 ffffffff817f2cfc
ffffffff8107c97a
[    2.494195]  ffff880178ba1098 ffff880178ba1088 ffffffff81039d08
ffff880178ba1090
[    2.494199]  ffffffffa0095eda ffff88003fc77000 ffff88003fc70000
ffff88003fc70778
[    2.494200] Call Trace:
[    2.494208]  [<ffffffff817f2cfc>] dump_stack+0x46/0x58
[    2.494214]  [<ffffffff8107c97a>] ? vprintk_emit+0x427/0x48d
[    2.494220]  [<ffffffff81039d08>] warn_slowpath_common+0x81/0x9b
[    2.494251]  [<ffffffffa0095eda>] ? check_crtc_state+0x6ea/0x73b [i915]
[    2.494255]  [<ffffffff81039dc5>] warn_slowpath_fmt+0x46/0x48
[    2.494286]  [<ffffffffa0095eda>] check_crtc_state+0x6ea/0x73b [i915]
[    2.494320]  [<ffffffffa00a05ac>] intel_modeset_check_state+0x372/0x630
[i915]
[    2.494352]  [<ffffffffa00a088f>] intel_set_mode+0x25/0x2f [i915]
[    2.494384]  [<ffffffffa00a0ee8>] intel_crtc_set_config+0x64f/0x85e [i915]
[    2.494403]  [<ffffffffa001c315>] drm_mode_set_config_internal+0x56/0xcf
[drm]
[    2.494410]  [<ffffffffa0062dc9>] drm_fb_helper_set_par+0x5e/0xa7
[drm_kms_helper]
[    2.494415]  [<ffffffff813a2af9>] fbcon_init+0x320/0x41d
[    2.494420]  [<ffffffff813f6a3e>] visual_init+0xbc/0x112

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