linux-kernel - Re: [PATCH 1/4] regmap: irq: Fix lost interrupts by introducing handle

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Date:   Tue, 4 Apr 2017 16:28:52 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Tony Lindgren <tony@...mide.com>
Cc:     linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org,
        Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>,
        Lee Jones <lee.jones@...aro.org>,
        Marcel Partap <mpartap@....net>,
        Michael Scott <michael.scott@...aro.org>
Subject: Re: [PATCH 1/4] regmap: irq: Fix lost interrupts by introducing
 handle_reread

On Tue, Apr 04, 2017 at 06:56:30AM -0700, Tony Lindgren wrote:
> * Mark Brown <broonie@...nel.org> [170404 05:22]:

> > It is sadly far too common for people to implement interrupt controllers
> > that only do edge triggers, I've no idea why even on what are supposed
> > to be relatively high end SoCs.  It seems to be a hardware designer
> > thing, AFAICT they think for something to be useful it needs to be a bit
> > more complicated.

> For edge only GPIO controllers handling level interrupts might be
> somewhat fixable in software. The GPIO controller could have a loop
> reading of the GPIO line status in the interrupt handler and comparing
> it to the configured triggering.

Yeah, it's doable if annoying.

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