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The power state driver would print out the current power state along with its signals everytime a power signal interrupt was fired. On some systems, a signal may briefly go low and then come back before our chipset module has a chance to notice. This causes what appears to be duplicate prints. This commit tries to only print out the current power state when something has actually changed. If the input power signals or state differs from the last time it checked, then the information will be printed. BUG=None BRANCH=gru TEST=Find a kevin where PGOOD goes away quite frequently. Build and flash; Verify that significantly less "power state S0" console spam is emitted. TEST=Verify that all state transitions are still printed. Change-Id: I9d66c04e2ed79ab203c54f0a8dad82f32856bbf0 Signed-off-by: Aseda Aboagye <aaboagye@google.com> Reviewed-on: https://chromium-review.googlesource.com/388761 Commit-Ready: Aseda Aboagye <aaboagye@chromium.org> Tested-by: Aseda Aboagye <aaboagye@chromium.org> Reviewed-by: Randall Spangler <rspangler@chromium.org>