[Bug 102359] New: [BAT][KBL] *ERROR* failed to enable link training

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=102359

            Bug ID: 102359
           Summary: [BAT][KBL] *ERROR* failed to enable link training
           Product: DRI
           Version: XOrg 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

On CI_DRM_2989, the machine fi-kbl-7260u produced the following wardning when
running igt at gem_exec_suspend@basic-s3:

[  299.955251] [drm:intel_enable_shared_dpll [i915]] enabling DPLL 1
[  299.957459] [drm:intel_power_well_enable [i915]] enabling DDI B IO power
well
[  299.958752] [drm:intel_dp_set_signal_levels [i915]] Using signal levels
00000000
[  299.958796] [drm:intel_dp_set_signal_levels [i915]] Using vswing level 0
[  299.958835] [drm:intel_dp_set_signal_levels [i915]] Using pre-emphasis level
0
[  299.958875] [drm:intel_dp_program_link_training_pattern [i915]] Using DP
training pattern TPS1
[  299.995390] [drm:drm_dp_dpcd_access] Too many retries, giving up. First
error: -5
[  299.995415] [drm:intel_dp_start_link_train [i915]] *ERROR* failed to enable
link training
[  299.995433] [drm:intel_dp_start_link_train [i915]] [CONNECTOR:58:DP-1] Link
Training failed at link rate = 162000, lane count = 1
[  299.995451] [drm:intel_dp_get_link_train_fallback_values [i915]] *ERROR*
Link Training Unsuccessful

This error can also be triggered easily when running full IGT on shard-kbl:
https://intel-gfx-ci.01.org/tree/drm-tip/shards.html

Full logs:
https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_2989/fi-kbl-7260u/igt@gem_exec_suspend@basic-s3.html

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