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LVDS does not use an HPD pin so it may be invalid. Handle this case correctly in link encoder creation. Fixes:7c8fb3b8e9("drm/amd/display: Add hpd_source index check for DCE60/80/100/110/112/120 link encoders") Closes: https://gitlab.freedesktop.org/drm/amd/-/issues/5012 Cc: Srinivasan Shanmugam <srinivasan.shanmugam@amd.com> Cc: Roman Li <roman.li@amd.com> Reviewed-by: Roman Li <roman.li@amd.com> Reviewed-by: Srinivasan Shanmugam <srinivasan.shanmugam@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> (cherry picked from commit3b5620f7ee) Cc: stable@vger.kernel.org