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.
Cc: stable@kernel.org
Reported-by: Paul Walmsley <paul@pwsan.com>
Cc: Igor Grinberg <grinberg@compulab.co.il>
Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Acked-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Kevin Hilman <khilman@ti.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
* to detect events and generate interrupts at least on OMAP3.
*/
__raw_writel(0, bank->base + bank->regs->debounce_en);
+ bank->dbck_enable_mask = 0;
clk_disable(bank->dbck);
bank->dbck_enabled = false;