From: Maxime Ripard <maxime.ripard-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
To: Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
Cc: Linus Walleij
<linus.walleij-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>,
Chen-Yu Tsai <wens-jdAy2FN1RRM@public.gmane.org>,
devicetree <devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
linux-sunxi-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
Subject: Re: [PATCH] pinctrl: sun4i: GPIOs configured as irq must be set to input before reading
Date: Wed, 11 Mar 2015 18:48:34 +0100 [thread overview]
Message-ID: <20150311174834.GP5085@lukather> (raw)
In-Reply-To: <1425849237-30182-1-git-send-email-hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
[-- Attachment #1: Type: text/plain, Size: 891 bytes --]
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-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
Acked-by: Maxime Ripard <maxime.ripard-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
Thanks!
Maxime
--
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
next prev parent reply other threads:[~2015-03-11 17:48 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-03-08 21:13 [PATCH] pinctrl: sun4i: GPIOs configured as irq must be set to input before reading Hans de Goede
[not found] ` <1425849237-30182-1-git-send-email-hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2015-03-11 17:48 ` Maxime Ripard [this message]
2015-03-18 9:57 ` Linus Walleij
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