[Bug 69917] New: [Baytrail-M] testdisplay with two pipes cause "*ERROR* DPLL 0 failed to lock" and "Call trace"

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=69917

          Priority: medium
            Bug ID: 69917
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [Baytrail-M] testdisplay with two pipes cause "*ERROR*
                    DPLL 0 failed to lock" and "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 86779
  --> https://bugs.freedesktop.org/attachment.cgi?id=86779&action=edit
dmesg: testdisplay cause error and call trace

Environment:
----------------------
Kernel: (drm-intel-next-queued)6d87c504b91510f6e3e933a9ee795e08bcb26a0d
Author: Jesse Barnes <jbarnes at virtuousgeek.org>
Date:   Fri Sep 27 10:40:54 2013 -0700

    drm/i915/vlv: reduce GT FIFO error info to a debug message

Description:
-----------------------
When both VGA and eDP plugged in, run testdisplay, eDP is good to display, but
while switching to VGA, the process will be stuck at the first mode of VGA.

Then check out the dmesg, there's Error and call trace in it. I have tested
many older kernels and can't find a good commit, it's not a regression.
Testdisplay works well if we only plugged in one pipe. Our baytrail only
support eDP and VGA. 

It's an unique issue on Baytrail.


Error:
-----------------------
[  186.312961] [drm:intel_edp_psr_match_conditions], PSR not supported on this
p
latform
[  186.312970] [drm:intel_crtc_mode_set], [ENCODER:10:DAC-10] set
[MODE:0:1680x1
050]
[  186.316857] [drm:vlv_enable_pll] *ERROR* DPLL 0 failed to lock
[  186.317531] [drm:g4x_check_srwm], SR watermark: display plane 107, cursor 6
[  186.317537] [drm:g4x_check_srwm], SR watermark: display plane 212, cursor 10
[  186.317543] [drm:valleyview_update_wm], Setting FIFO watermarks - A:
plane=93, cursor=6, B: plane=2, cursor=2, SR: plane=107, cursor=10
[  186.368849] [drm:ironlake_wait_for_vblank], vblank wait timed out



Call Trace:
----------------------
There's three kind of call trace, please see them from dmesg.

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