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

On Tue, Oct 23, 2012 at 8:09 PM, Kevin Hilman
[off-list ref] 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>

Thanks! Applied with Felipe's and Santosh's ACKs.

Yours,
Linus Walleij