From: Krzysztof Helt <krzysztof.h1@wp.pl>

This patch adds restrictions to calculations of m, n and p factors
which sets the pixclock for the Permedia 2V. I found during tests
that synchronization is unstable if m (divisor) is bigger than
half of the n (numerator). The patch disallows such settings
combination.

Signed-off-by: Krzysztof Helt <krzysztof.h1@wp.pl>
 
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This patch has fixed range overflow with m > 127 comparing to
previous one.

Regards,
Krzysztof

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