Few testcases - dmesg-warn/dmesg-fail - *ERROR* Failed to probe lspcon|*ERROR* LSPCON mode hasn't settled

https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_12455/fi-apl-guc/igt@kms_addfb_basic@basic-x-tiled-legacy.html

<7> [144.774377] i915 0000:00:02.0: [drm:lspcon_wake_native_aux_ch [i915]] Native AUX CH up, DPCD version: 1.2
<7> [144.776108] i915 0000:00:02.0: [drm:drm_dp_dual_mode_detect [drm_display_helper]] DP dual mode HDMI ID:  (err -71)
<7> [144.778559] i915 0000:00:02.0: [drm:drm_dp_dual_mode_detect [drm_display_helper]] DP dual mode HDMI ID:  (err -71)
<7> [144.781149] i915 0000:00:02.0: [drm:drm_dp_dual_mode_detect [drm_display_helper]] DP dual mode HDMI ID:  (err -71)
<7> [144.783604] i915 0000:00:02.0: [drm:drm_dp_dual_mode_detect [drm_display_helper]] DP dual mode HDMI ID:  (err -71)
<7> [144.786106] i915 0000:00:02.0: [drm:drm_dp_dual_mode_detect [drm_display_helper]] DP dual mode HDMI ID:  (err -71)
<7> [144.788621] i915 0000:00:02.0: [drm:drm_dp_dual_mode_detect [drm_display_helper]] DP dual mode HDMI ID:  (err -71)
<7> [144.788657] i915 0000:00:02.0: [drm:lspcon_init [i915]] No LSPCON detected, found unknown
<3> [144.788974] i915 0000:00:02.0: [drm] *ERROR* Failed to probe lspcon
<3> [144.789055] i915 0000:00:02.0: [drm] *ERROR* LSPCON init failed on port B
<7> [144.789820] i915 0000:00:02.0: [drm:drm_dp_read_dpcd_caps [drm_display_helper]] AUX B/DDI B/PHY B: DPCD: 12 14 c4 01 00 05 81 00 00 00 00 00 00 00 00
<7> [144.790492] i915 0000:00:02.0: [drm:drm_dp_read_desc [drm_display_helper]] AUX B/DDI B/PHY B: DP branch: OUI 00-60-ad dev-ID 2800IR HW-rev 2.3 SW-rev 2.1 quirks 0x0000
<7> [144.791041] i915 0000:00:02.0: [drm:intel_power_well_disable [i915]] disabling dpio-common-bc
<7> [144.791516] i915 0000:00:02.0: [drm:intel_power_well_disable [i915]] disabling PW_2
<7> [144.791947] i915 0000:00:02.0: [drm:intel_power_well_disable [i915]] disabling DC_off
<7> [144.792301] i915 0000:00:02.0: [drm:gen9_enable_dc5 [i915]] Enabling DC5
<7> [144.792644] i915 0000:00:02.0: [drm:gen9_set_dc_state.part.13 [i915]] Setting DC state from 00 to 01
<7> [144.793272] i915 0000:00:02.0: [drm:intel_power_well_disable [i915]] disabling always-on
<7> [144.793774] [drm:drm_helper_probe_single_connector_modes [drm_kms_helper]] [CONNECTOR:111:DP-1] disconnected
<7> [144.795768] [drm:drm_helper_probe_single_connector_modes [drm_kms_helper]] [CONNECTOR:123:DP-2]
<7> [144.795809] i915 0000:00:02.0: [drm:intel_dp_detect [i915]] [CONNECTOR:123:DP-2]