[DVB] CXD2099 - Question about the CAM clock

["Sébastien RAILLARD (COEXSI)" <sr@coexsi.fr>]

Dear Oliver,

I’ve done some tests with the CAM reader from Digital Devices based on Sony
CXD2099 chip and I noticed some issues with some CAM:
* SMIT CAM    : working fine
* ASTON CAM   : working fine, except that it's crashing quite regularly
* NEOTION CAM : no stream going out but access to the CAM menu is ok

When looking at the CXD2099 driver code, I noticed the CAM clock (fMCLKI) is
fixed at 9MHz using the 27MHz onboard oscillator and using the integer
divider set to 3 (as MCLKI_FREQ=2).

I was wondering if some CAM were not able to work correctly at such high
clock frequency.

So, I've tried to enable the NCO (numeric controlled oscillator) in order to
setup a lower frequency for the CAM clock, but I wasn't successful, it's
looking like the frequency must be around the 9MHz or I can't get any
stream.

Do you know a way to decrease this CAM clock frequency to do some testing?

Best regards,
Sebastien.