[PATCH] gpio/omap: fix off-mode bug: clear debounce clock enable mask on disable

On Tuesday 23 October 2012 11:39 PM, Kevin Hilman wrote:

From: Kevin Hilman <redacted>

When debounce clocks are disabled, ensure that the banks
dbck_enable_mask is cleared also.  Otherwise, context restore on
subsequent off-mode transition will restore previous value from the
shadow copies (bank->context.debounce*) leading to mismatch state
between driver state and hardware state.

This was discovered when board code was doing

   gpio_request_one()
   gpio_set_debounce()
   gpio_free()

which was leaving the GPIO debounce settings in a confused state.
Then, enabling off mode causing bogus state to be restored, leaving
GPIO debounce enabled which then prevented the CORE powerdomain from
transitioning.

Reported-by: Paul Walmsley <paul@pwsan.com>
Cc: Igor Grinberg <redacted>
Signed-off-by: Kevin Hilman <redacted>
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Acked-by: Santosh Shilimkar <redacted>