Camera Interface VS/HS Issue

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Hi there,

i just recently ran into a problem when trying to let the ISP
(OMAP3530) generate HS/VS signals in SYNC mode.
I am building a module to do so.

It basically enables the three clocks (cam_ick, cam_mclk and csi2_96m_fck),
then sets

ISPCCDC_PIX_LINES_PPLN
ISPCCDC_PIX_LINES_HLPRF
ISPCCDC_HD_VD_WID_VDW
ISPCCDC_HD_VD_WID_HDW
ISPCCDC_SYN_MODE_VDHDEN
ISPCCDC_SYN_MODE_VDHDOUT
ISPCCDC_CFG_VDLC
ISPTCTRL_CTRL_DIVA
ISPTCTRL_CTRL_DIVB
ISPCCDC_PCR

via some calls to ioremap and ioread32/iowrite32.
My question now is the following:
when i hook an oscilloscope to the corresponding pins (CAM_VS, CAM_HS,
CAM_XCLKA) i can see that only the CAM_XCLKA is working correctly,
also at the configured frequency.
Both, CAM_VS and CAM_HS remain at low voltage all the time, even when
i switch their polarities (ISPCCDC_SYN_MODE_VDPOL,
ISPCCDC_SYN_MODE_HDPOL) that behavior does not change and signals
always remain at low voltage.

Could someone help me out, or give me a hint what i might be missing
to generate those output signals correctly?

Thank you very much,
Matthias
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