[Bug 99109] [SKL] eDP EDID is invalid

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99109

--- Comment #1 from Ville Syrjala <ville.syrjala at linux.intel.com> ---
This is caused by port A trying to use AUX A which is really meant for port E
on this machine.

[    2.841811] [drm:intel_dp_init_connector [i915]] Adding eDP connector on
port A
[    2.841900] [drm:intel_dp_init_connector [i915]] using AUX A for port A
(platform default)
[    2.841976] [drm:intel_pps_dump_state [i915]] cur t1_t3 0 t8 0 t9 0 t10 0
t11_t12 0
[    2.841994] [drm:intel_pps_dump_state [i915]] vbt t1_t3 2000 t8 10 t9 2000
t10 500 t11_t12 5000
[    2.842011] [drm:intel_dp_init_panel_power_sequencer [i915]] panel power up
delay 200, power down delay 50, power cycle delay 500
[    2.842028] [drm:intel_dp_init_panel_power_sequencer [i915]] backlight on
delay 1, off delay 200
[    2.842090] [drm:intel_dp_init_panel_power_sequencer_registers [i915]] panel
power sequencer register settings: PP_ON 0x7d00001, PP_OFF 0x1f40001, PP_DIV
0x4af05
[    2.842113] [drm:intel_edp_panel_vdd_sanitize [i915]] VDD left on by BIOS,
adjusting state tracking
[    2.842707] [drm:intel_dp_read_dpcd [i915]] DPCD: 11 0a 82 01 00 03 01 01 02
00 00 00 00 00 00
[    2.843187] [drm:intel_dp_read_desc [i915]] DP branch: OUI 00-00-00(NS)
dev-ID  HW-rev 0.0 SW-rev 0.0
[    2.847703] i915 0000:00:02.0: eDP-1: EDID is invalid:
[    2.847708]  [00] ZERO 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[    2.847711]  [00] ZERO 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[    2.847715]  [00] ZERO 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[    2.847719]  [00] ZERO 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[    2.847722]  [00] ZERO 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[    2.847724]  [00] ZERO 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[    2.847727]  [00] ZERO 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[    2.847730]  [00] ZERO 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[    2.847789] [drm:get_backlight_max_vbt [i915]] VBT defined backlight
frequency 200 Hz
[    2.847815] [drm:intel_panel_setup_backlight [i915]] Connector eDP-1
backlight initialized, disabled, brightness 0/7500
[    2.847877] [drm:intel_hdmi_init_connector [i915]] Adding HDMI connector on
port B
[    2.847938] [drm:intel_hdmi_init_connector [i915]] Using DDC pin 0x5 for
port B (VBT)
[    2.847970] [drm:intel_hdmi_init_connector [i915]] Adding HDMI connector on
port C
[    2.848012] [drm:intel_hdmi_init_connector [i915]] Using DDC pin 0x4 for
port C (VBT)
[    2.848037] [drm:intel_dp_init_connector [i915]] Adding DP connector on port
E
[    2.848090] [drm:intel_dp_init_connector [i915]] using AUX A for port E
(VBT)

I think what we need to do is notice and handle the conflict between the
platform default AUX assignment and the VBT based assignment. That is, we need
to move the platform default AUX channel assignment to happen at the same time
or before the VBT based assignment.

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