[Bug 101154] [BAT][SKL] Test assertion failure function kmstest_dumb_create, file igt_kms.c:508 on fi-skl-6700hq

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101154

--- Comment #4 from Manasi <manasi.d.navare at intel.com> ---
Again here the basic problem is due to dp_aux_ch timeouts due to which it
cannot even enable link training and our link training fallback algorithm
treats that error same as the link training failure and fallsback to lower
value.

[  419.157692] [drm:intel_dp_aux_ch [i915]] dp_aux_ch timeout status 0x7d4003ff
[  419.166262] [drm:intel_dp_aux_ch [i915]] dp_aux_ch timeout status 0x7d4003ff
[  419.174831] [drm:intel_dp_aux_ch [i915]] dp_aux_ch timeout status 0x7d4003ff
[  419.183401] [drm:intel_dp_aux_ch [i915]] dp_aux_ch timeout status 0x7d4003ff
[  419.191972] [drm:intel_dp_aux_ch [i915]] dp_aux_ch timeout status 0x7d4003ff
[  419.200543] [drm:intel_dp_aux_ch [i915]] dp_aux_ch timeout status 0x7d4003ff
[  419.200555] [drm:drm_dp_dpcd_access] Too many retries, giving up. First
error: -110
[  419.200576] [drm:intel_dp_start_link_train [i915]] *ERROR* failed to enable
link training
[  419.200597] [drm:intel_dp_start_link_train [i915]] Link Training failed at
link rate = 162000, lane count = 2

@Jani how can we handle this failure?
In this case, reducing link parameters will not help since the basic error is
in the aux transactions and hence it could not even start link training. So
should the atomic commit just fail here?

Manasi

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