[PATCH] pinctrl: sun4i: GPIOs configured as irq must be set to input before reading

[maxime.ripard@free-electrons.com (Maxime Ripard)]

On Sun, Mar 08, 2015 at 10:13:57PM +0100, Hans de Goede wrote:
> On sun4i-a10, when GPIOs are configured as external interrupt the value for
> them in the data register does not seem to get updated, so set their mux to
> input (and restore afterwards) when reading the pin.
> 
> Missed edges seem to be buffered, so this does not introduce a race
> condition.
> 
> I've also tested this on sun5i-a13 and sun7i-a20 and those do not seem to
> be affected, the input value representation in the data register does seem
> to correctly get updated to the actual pin value while in irq mode there.
> 
> Signed-off-by: Hans de Goede <hdegoede@redhat.com>

Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com>

Thanks!
Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
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