Two changes: (1) change debounce period from 1s to 250ms.  This appears to be fine and     speeds things up a little. (2) In the middle of cbb_pcic_power_disable_socket we write 0 to the EXCA_INTR     register to put the card into reset.  However, this turns off CSC     interrupts for TI bridges (and maybe others).  So no further card     insertion events would be noticed.  To compensate, after we've gone     through the entire power down sequence, turn on EXCA_INTR_ENABLE so     that CSC events happen.
Two changes:
(1) change debounce period from 1s to 250ms.  This appears to be fine and
    speeds things up a little.
(2) In the middle of cbb_pcic_power_disable_socket we write 0 to the EXCA_INTR
    register to put the card into reset.  However, this turns off CSC
    interrupts for TI bridges (and maybe others).  So no further card
    insertion events would be noticed.  To compensate, after we've gone
    through the entire power down sequence, turn on EXCA_INTR_ENABLE so
    that CSC events happen.

#2 should fix the 'dead slot' problem that has been reported after
card ejection (but only 16-bit cards).

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase