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SubjectRe: [PATCH v5 1/3] ASoC: rt5677: allow multiple interrupt sources
From: Mark Brown <broonie@kernel.org>
Date: Wed, May 8, 2019 at 12:36 AM
To: Fletcher Woodruff
Cc: <linux-kernel@vger.kernel.org>, Ben Zhang, Jaroslav Kysela, Liam
Girdwood, Oder Chiou, Takashi Iwai, Curtis Malainey,
<alsa-devel@alsa-project.org>

> On Tue, May 07, 2019 at 04:01:13PM -0600, Fletcher Woodruff wrote:
>
> > This patch does not add polarity flipping support within regmap-irq
> > because there is extra work that must be done within the irq handler
> > to support hotword detection. On the Chromebook Pixel, the firmware will
> > disconnect GPIO1 from the jack detection irq when a hotword is detected
> > and trigger the interrupt handler. Inside the handler, we will need to
> > detect this, report the hotword event, and re-connect GPIO1 to the jack
> > detection irq.
>
> Please have a conversation with your firmware team about the concept of
> abstraction - this is clearly a problematic thing to do as it's causing
> the state of the system to change for devices that are mostly managed
> from the operating system. It's not clear to me that this shouldn't be
> split off somehow so that it doesn't impact other systems using this
> hardware.
>
Pixelbooks (Samus Chromebook) are the only devices that use this part.
Realtek has confirmed this. Therefore we only have to worry about
breaking ourselves. That being said I agree there is likely a better
way to handle general abstraction here. We will need the explicit irq
handling since I will be following these patches up with patches that
enable hotwording on the codec (we will be sending the firmware to
linux-firmware as well that is needed for the process.)

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