  We investigate the possibility that the CP violation due to the soft
supersymmetry breaking terms in squark mixing can give significant
contributions to the various $\gamma$ related parameters in B decays, different
from those of the Standard Model. We derive the new limits on
$(\delta^u_{12})_{LL,LR,RR}$ and on $(\delta^d_{23})_{LL,LR,RR}$ from the
recent data on $D^0$--$\bar{D}^0$ oscillation as well as those on
$B_s^0$--$\bar{B_s}^0$ oscillation. We show that, together with all the other
constraints, the currents limits on these parameters still allow large
contributions to the CP violating phases in $B_s^0$--$\bar{B_s}^0$ as well as
$D^0$--$\bar{D}^0$ oscillations which will modify some of the proposed
measurements of $\gamma$ parameters in CP violating B decays. However, the
current constraints already dictate that the one-loop squark mixing
contributions to various B decay amplitudes cannot be competitive with that of
the Standard Model (SM), at least for those B decay modes which are dominated
the tree level amplitudes within the SM, and therefore they are not significant
in contributing to CP asymmetries in the corresponding B decays.
