Signal CLKREQ don't turn OFF during Idle

Hello,

I've a Beagleboard xM Rev A3, I'm trying to get the lowest power
consumption in Idle mode.

So normally, in Idle mode, the DM3730 turn low its SYS_CLKREQ signal
output.
Then this should doing TPS65930 turn low its CLK_EN signal output,
which should desactive the 26MHz Tri-state oscillator (Signal OSC_EN).

But when active Idle Mode, the CLK_EN signal don't turn low.

I've check the register PRM_POLCTRL, and it has a good configuration :

CLKOUT_POL = 0
CLKREQ_POL=1