linux-kernel - Re: [PATCH 3/4] pinctrl: baytrail: Rework interrupt handling

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Date:	Fri, 6 Mar 2015 12:23:11 +0100
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Mika Westerberg <mika.westerberg@...ux.intel.com>
Cc:	Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
	Mathias Nyman <mathias.nyman@...ux.intel.com>,
	Hans Holmberg <hans.holmberg@...el.com>,
	Benjamin Adler <benadler@....net>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/4] pinctrl: baytrail: Rework interrupt handling

On Mon, Feb 23, 2015 at 1:53 PM, Mika Westerberg
<mika.westerberg@...ux.intel.com> wrote:

> Instead of handling everything in the driver's first level interrupt
> handler, we can take advantage of already existing flow handlers that are
> provided by the IRQ core.
>
> This changes the functionality a bit also. Previously the driver looped
> over pending interrupts in a single loop, restarting the loop if some
> interrupt changed state. This caused problem with Lenovo Thinkpad 10
> digitizer that it was not able to deassert the interrupt before the driver
> disabled the interrupt for good (looplimit was exhausted).
>
> Rework the interrupt handling logic a bit so that we provide proper mask,
> ack and unmask operations in terms of Baytrail GPIO hardware and loop over
> pending interrupts only once. If the interrupt remains asserted the first
> level handler will be re-triggered automatically.
>
> Signed-off-by: Mika Westerberg <mika.westerberg@...ux.intel.com>

Patch applied for fixes.

Yours,
Linus Walleij
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