linux-kernel - Re: [PATCH v2] spi: bcm2835: Enable shared interrupt support

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Message-ID: <20200615192630.GC4447@sirena.org.uk>
Date:   Mon, 15 Jun 2020 20:26:30 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Robin Murphy <robin.murphy@....com>
Cc:     Florian Fainelli <f.fainelli@...il.com>, lukas@...ner.de,
        "moderated list:BROADCOM BCM2711/BCM2835 ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Scott Branden <sbranden@...adcom.com>,
        Ray Jui <rjui@...adcom.com>, linux-kernel@...r.kernel.org,
        "open list:SPI SUBSYSTEM" <linux-spi@...r.kernel.org>,
        Rob Herring <robh+dt@...nel.org>,
        "maintainer:BROADCOM BCM281XX/BCM11XXX/BCM216XX ARM ARCHITE..." 
        <bcm-kernel-feedback-list@...adcom.com>,
        "moderated list:BROADCOM BCM2711/BCM2835 ARM ARCHITECTURE" 
        <linux-rpi-kernel@...ts.infradead.org>,
        Martin Sperl <kernel@...tin.sperl.org>,
        Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
Subject: Re: [PATCH v2] spi: bcm2835: Enable shared interrupt support

On Mon, Jun 15, 2020 at 06:31:58PM +0100, Robin Murphy wrote:

> Now that I've been inclined to go and look up the documentation, are we sure
> this so-very-contentious check is even correct? From my reading of things
> we're checking whether the RXR interrupt function is *enabled*, which still
> says nothing about whether either condition for the interrupt being
> *asserted* is true (RXR = 1 or DONE = 1). Thus if more than one SPI instance
> is active at once we could still end up trying to service an IRQ on a
> controller that didn't raise it.

OK, I've pulled the patch from the queue for now :/

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