few kms tests - dmesg-warn - *ERROR* Failed to read DPCD register *

https://gfx-ci.igk.intel.com/cibuglog-ng/testresult/1868514088?query_key=a75412dd115b4675b5ad912dbc4d0cb538f24ed1

<7> [167.200731] [drm:drm_do_probe_ddc_edid] drm: skipping non-existent adapter AUX USBC3/DDI TC3/PHY TC3
<7> [167.200738] i915 0000:00:02.0: [drm:drm_edid_connector_update] [CONNECTOR:264:DP-3] EDID changed, epoch counter 2
<7> [167.200745] i915 0000:00:02.0: [drm:intel_dp_set_edid [i915]] [CONNECTOR:264:DP-3] VRR capable: no
<7> [167.200819] i915 0000:00:02.0: [drm:intel_dp_set_edid [i915]] [CONNECTOR:264:DP-3] DFP max bpc 0, max dotclock 0, TMDS clock 0-0, PCON Max FRL BW 0Gbps
<7> [167.294796] i915 0000:00:02.0: [drm:intel_power_well_disable [i915]] disabling AUX_TC3
<7> [167.360833] i915 0000:00:02.0: [drm:drm_dp_dpcd_access [drm_display_helper]] AUX USBC3/DDI TC3/PHY TC3: Too many retries, giving up. First error: -6
<7> [167.522705] i915 0000:00:02.0: [drm:drm_dp_dpcd_access [drm_display_helper]] AUX USBC3/DDI TC3/PHY TC3: Too many retries, giving up. First error: -6
<3> [167.522733] i915 0000:00:02.0: [drm] *ERROR* Failed to read DPCD register 0x92
<7> [167.522865] i915 0000:00:02.0: [drm:intel_dp_set_edid [i915]] PCON ENCODER DSC DPCD: 00 00 00 00 00 00 00 00 00 00 00 00 00
<7> [167.523148] i915 0000:00:02.0: [drm:intel_dp_set_edid [i915]] [CONNECTOR:264:DP-3] RGB->YcbCr conversion? no, YCbCr 4:2:0 allowed? yes, YCbCr 4:4:4->4:2:0 conversion? no
<7> [167.682718] i915 0000:00:02.0: [drm:drm_dp_dpcd_access [drm_display_helper]] AUX USBC3/DDI TC3/PHY TC3: Too many retries, giving up. First error: -6
<7> [167.682764] i915 0000:00:02.0: [drm:drm_mode_prune_invalid] Rejected mode: "3840x2160": 60 533250 3840 3888 3920 4000 2160 2163 2168 2222 0x48 0x9 (STALE)
<7> [167.682772] i915 0000:00:02.0: [drm:drm_mode_prune_invalid] Rejected mode: "3840x2160": 30 297000 3840 4016 4104 4400 2160 2168 2178 2250 0x40 0x5 (STALE)
<7> [167.682775] i915 0000:00:02.0: [drm:drm_mode_prune_invalid] Rejected mode: "3840x2160": 30 296703 3840 4016 4104 4400 2160 2168 2178 2250 0x40 0x5 (STALE)
<7> [167.682778] i915 0000:00:02.0: [drm:drm_mode_prune_invalid] Rejected mode: "2560x1440": 60 241500 2560 2608 2640 2720 1440 1443 1448 1481 0x40 0x9 (STALE)
<7> [167.682781] i915 0000:00:02.0: [drm:drm_mode_prune_invalid] Rejected mode: "1920x1080": 60 148500 1920 2008 2052 2200 1080 1084 1089 1125 0x40 0x5 (STALE)
<7> [167.682783] i915 0000:00:02.0: [drm:drm_mode_prune_invalid] Rejected mode: "1920x1080": 60 148352 1920 2008 2052 2200 1080 1084 1089 1125 0x40 0x5 (STALE)
<7> [167.682791] i915 0000:00:02.0: [drm:drm_mode_prune_invalid] Rejected mode: "1920x1080": 60 138500 1920 1962 2000 2080 1080 1083 1088 1111 0x40 0x9 (STALE)