On Tuesday 24 May 2011 15:59:57 André Weidemann wrote:
> Hi Peter,
> For the time being the S2-3200 and related cards do not seem to work.
> From my understanding this patch should have been rolled back, but
> Mauro did not. Feel free to post a message to the linux-media mailing
> list. Maybe someone there knows a bit more...
>
> Regards
> André
Hi,
I did some more investigation and found what appears to be close to a fix:
media_tree/drivers/media/dvb/frontends/stb0899_algo.c
There is some automagic frequency guessing which does not work:
/* timing loop computation & symbol rate optimisation */
derot_limit = (internal->sub_range / 2L) / internal->mclk;
derot_step = (params->srate / 2L) / internal->mclk;
^^^^^ by changing this line to:
+ derot_step = (params->srate / 16L) / internal->mclk;
Things are starting to look better. I'm thinking about using a simple:
derot_freq = ((index * index) - index) * internal->direction;
This gives 127 steps before the maximum is reached.
while ((stb0899_check_tmg(state) != TIMINGOK) && next_loop) {
index++;
derot_freq += index * internal->direction * derot_step; /*
next derot zig zag position */
if (abs(derot_freq) > derot_limit)
next_loop--;
if (next_loop) {
STB0899_SETFIELD_VAL(CFRM, cfr[0], MSB(state->config-
>inversion * derot_freq));
STB0899_SETFIELD_VAL(CFRL, cfr[1], LSB(state->config-
>inversion * derot_freq));
stb0899_write_regs(state, STB0899_CFRM, cfr, 2); /*
derotator frequency */
}
internal->direction = -internal->direction; /* Change
zigzag direction */
}
Any comments?
--HPS
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