e98459c06e
[Why] Pipes for MPO primary and overlay will be power down and power up during plug/unplug external monitor while MPO video playback. But the pipes were the same after plug/unplug and should not need to be power down and power up or it will make page flip interrupt disabled and cause hang issue. [How] Add pipe split change condition that not only check the top pipe pointer but also check the index of top pipe if both top pipes are available. Reviewed-by: Sun peng Li <Sunpeng.Li@amd.com> Acked-by: Brian Chang <Brian.Chang@amd.com> Signed-off-by: Tom Chung <chiahsuan.chung@amd.com> Tested-by: Daniel Wheeler <daniel.wheeler@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>