avr: Switch to input state prior to enabling pullup in gpio_in_reset()

If switching a pin from output low to input with pullup, there is an
intermediate state of either driven high or high impedance without a
pullup.  Similarly, when switching from output high to input without a
pullup, there is an intermediate state of either driven low or high
impedence with a pullup.  In both cases it is preferable for the
latter transition.

Also, calculate the final setting prior to making any changes to
reduce the time in that intermediate state.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

0 files changed, 0 insertions, 0 deletions