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PandaBoardES:Cannot enable digit output when splash screen in uboot

I am working on  splash screen from HDMI in uboot , and I have a trouble with how to enable digit output.

in my code, after I set DISPC_CONTROL1[1]TVENABLE bit,  It still be zero when I read this bit ,and the screen doesn't display after DISPC_CONTROL1[6]GOTV being set.

I have read the driver in omap kernel, but I found nothing expect some IRQ setting in DISPC_IRQENABLE and DISPC_IRQSTATUS,  and I quiet don't understand that part of code. 

Could you help me with this?