[Bug 96614] [BAT BDW] *ERROR* failed to enable link training/failed to start channel equalization

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96614

--- Comment #14 from Jari Tahvanainen <jari.tahvanainen at intel.com> ---
Please check out if CI_DRM test
https://intel-gfx-ci.01.org/CI/CI_DRM_1757/fi-skl-6770hq/igt@gem_exec_suspend@basic-s3.html
having same failure (and possible root cause)

It is triggered with different test 
/opt/igt/tests/gem_exec_suspend --run-subtest basic-S3
but the failure symptoms in dmesg are equal to given by Imre
...
[  193.405060] [drm:verify_single_dpll_state.isra.78 [i915]] DPLL 3
[  193.405103] [drm:intel_enable_shared_dpll [i915]] enable DPLL 1 (active 1,
on? 0) for crtc 27
[  193.405125] [drm:intel_enable_shared_dpll [i915]] enabling DPLL 1
[  193.416309] [drm:intel_dp_aux_ch [i915]] dp_aux_ch timeout status 0x7d4003ff
...
[   29.132536] [drm:lspcon_init [i915]] No LSPCON detected, found type 1 HDMI
[   29.132556] [drm:lspcon_init [i915]] *ERROR* Failed to probe lspcon
[   29.132579] [drm:intel_ddi_init [i915]] *ERROR* LSPCON init failed on port B
...
[  195.052248] [drm:intel_dp_aux_ch [i915]] dp_aux_ch timeout status 0x7d4003ff
[  195.052256] [drm:drm_dp_dpcd_access] Too many retries, giving up. First
error: -110
[  195.052268] [drm:intel_dp_start_link_train [i915]] *ERROR* failed to enable
link training
[  195.052278] [drm:intel_dp_program_link_training_pattern [i915]] Using DP
training pattern TPS3
[  195.060914] [drm:intel_dp_aux_ch [i915]] dp_aux_ch timeout status 0x7d4003ff
...
[  195.328772] [drm:intel_dp_aux_ch [i915]] dp_aux_ch timeout status 0x7d4003ff
[  195.328801] [drm:drm_dp_dpcd_access] Too many retries, giving up. First
error: -110
[  195.328812] [drm:intel_dp_start_link_train [i915]] *ERROR* failed to start
channel equalization
[  195.337300] [drm:intel_dp_aux_ch [i915]] dp_aux_ch timeout status 0x7d4003ff
...

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