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

[Santosh Shilimkar]

On Tuesday 23 October 2012 11:39 PM, Kevin Hilman wrote:
> From: Kevin Hilman <khilman at ti.com>
>
> 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 at pwsan.com>
> Cc: Igor Grinberg <grinberg at compulab.co.il>
> Signed-off-by: Kevin Hilman <khilman at ti.com>
> ---
Acked-by: Santosh Shilimkar <santosh.shilimkar at ti.com>