Harald Welte escreveu:
See s3c2410_get_transition_latency() and
s3c2442_get_transition_latency(). Both try to find out how long will it
take for the PLL lock time to pass (on GTA01 only to tell the cpufreq
core the transition latency, on GTA02 also to know how long to wait
after turning on the PLL before it can be used). However, the formula
used is pure guesswork (I'm guessing it counts cycles from the 12MHz
input).
I think this is the logical conclusion, since there is no other clock
during PLL reconfiguration.
Actually, there is another clock: the divided 12MHz clock (on the slower
slow modes).
--
Cesar Eduardo Barros
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