We currently assume port A is connected to a DP sink when VBT is absent,
instead assume it is connected to an eDP sink, which seems like a more
common configuration. Although I don't have data to back this up,
it is still just as valid as asumming port A is not eDP. This reverts to
the behavior before a98d9c1 ("drm/i915/ddi: Rely on VBT DDI port info for
eDP detection") except only when there is no VBT. Knowing whether a panel
is eDP or not from the panel itself would have been nicer, but I cannot
find any DPCD registers that provide this reliably.

Cc: Jani Nikula <jani.nik...@intel.com>
Cc: Imre Deak <imre.d...@intel.com>
Cc: Rodrigo Vivi <rodrigo.v...@intel.com>
Cc: Clint Taylor <clinton.a.tay...@intel.com>

Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandi...@intel.com>
 drivers/gpu/drm/i915/intel_bios.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/i915/intel_bios.c 
index 82b144c..89a405e 100644
--- a/drivers/gpu/drm/i915/intel_bios.c
+++ b/drivers/gpu/drm/i915/intel_bios.c
@@ -1403,6 +1403,7 @@ init_vbt_missing_defaults(struct drm_i915_private 
                info->supports_dvi = (port != PORT_A && port != PORT_E);
                info->supports_hdmi = info->supports_dvi;
                info->supports_dp = (port != PORT_E);
+               info->supports_edp = (port == PORT_A);

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