drm/i915: Disable port sync when bigjoiner is used

drm/i915: Disable port sync when bigjoiner is used

commit 0653d501409eeb9f1deb7e4c12e4d0d2c9f1cba1 upstream.

The current modeset sequence can't handle port sync and bigjoiner
at the same time. Refuse port sync when bigjoiner is needed,
at least until we fix the modeset sequence.

v2: Add a FIXME (Vandite)

Cc: stable@vger.kernel.org
Tested-by: Vidya Srinivas <vidya.srinivas@intel.com>
Reviewed-by: Vandita Kulkarni <vandita.kulkarni@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240404213441.17637-4-ville.syrjala@linux.intel.com
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
(cherry picked from commit b37e1347b991459c38c56ec2476087854a4f720b)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>