[Bug 101144] New: [BAT][SKL] *ERROR* failed to enable link training

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101144

            Bug ID: 101144
           Summary: [BAT][SKL] *ERROR* failed to enable link training
           Product: DRI
           Version: DRI git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: martin.peres at free.fr
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

The test igt at kms_flip@basic-flip-vs-dpms generated a dmesg error (but still
passed) when running on fi-skl-6700hq on CI_DRM_2640:

[drm:intel_dp_start_link_train [i915]] *ERROR* failed to enable link training
[drm:intel_dp_start_link_train [i915]] Link Training failed at link rate =
270000, lane count = 2

This is possibly related to the following message a little above in the logs
(up to the warning reported by piglit):

[...]
[  420.613916] [drm:intel_dp_aux_ch [i915]] dp_aux_ch timeout status 0x7d4003ff
[  420.622421] [drm:intel_dp_aux_ch [i915]] dp_aux_ch timeout status 0x7d4003ff
[  420.630911] [drm:intel_dp_aux_ch [i915]] dp_aux_ch timeout status 0x7d4003ff
[  420.630939] [drm:drm_dp_dpcd_access] Too many retries, giving up. First
error: -110
[  420.634122] [drm:intel_dp_sink_dpms [i915]] failed to enable sink power
state
[...]
[  421.172326] [drm:intel_dp_aux_ch [i915]] dp_aux_ch timeout status 0x7d4003ff
[  421.180857] [drm:intel_dp_aux_ch [i915]] dp_aux_ch timeout status 0x7d4003ff
[  421.180869] [drm:drm_dp_dpcd_access] Too many retries, giving up. First
error: -110
[  421.180893] [drm:intel_dp_set_signal_levels [i915]] Using signal levels
00000000
[  421.180911] [drm:intel_dp_set_signal_levels [i915]] Using vswing level 0
[  421.180971] [drm:intel_dp_set_signal_levels [i915]] Using pre-emphasis level
0
[  421.180991] [drm:intel_dp_program_link_training_pattern [i915]] Using DP
training pattern TPS1
[...]
[  421.412348] [drm:intel_dp_aux_ch [i915]] dp_aux_ch timeout status 0x7d4003ff
[  421.420917] [drm:intel_dp_aux_ch [i915]] dp_aux_ch timeout status 0x7d4003ff
[  421.429499] [drm:intel_dp_aux_ch [i915]] dp_aux_ch timeout status 0x7d4003ff
[  421.438068] [drm:intel_dp_aux_ch [i915]] dp_aux_ch timeout status 0x7d4003ff
[  421.446637] [drm:intel_dp_aux_ch [i915]] dp_aux_ch timeout status 0x7d4003ff
[  421.455206] [drm:intel_dp_aux_ch [i915]] dp_aux_ch timeout status 0x7d4003ff
[  421.455218] [drm:drm_dp_dpcd_access] Too many retries, giving up. First
error: -110
[  421.455240] [drm:intel_dp_start_link_train [i915]] *ERROR* failed to enable
link training
[  421.455261] [drm:intel_dp_start_link_train [i915]] Link Training failed at
link rate = 270000, lane count = 2
[  421.455353] [drm:intel_dp_modeset_retry_work_fn [i915]] [CONNECTOR:48:eDP-1]

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