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VPSS_DCTRL: failed to get node input status

in evm DM8168 revision G 

root@dm816x-evm:~# cd /sys/dev*/pla*/vp*
root@dm816x-evm:/sys/devices/platform/vpss# echo 0 > ./graphics0/enabled
root@dm816x-evm:/sys/devices/platform/vpss# cat ./display2/mode
ntsc
root@dm816x-evm:/sys/devices/platform/vpss# cat ./display2/output
component,yuv422spuv
root@dm816x-evm:/sys/devices/platform/vpss# cat ./display2/name
sd
root@dm816x-evm:/sys/devices/platform/vpss# echo 1:sd > ./graphics0/nodes
VPSS_DCTRL: failed to get node input status
VPSS_GRPX : (0)- failed to enable node

 what i do wrong?