linux-kernel - Re: [PATCH v2 2/3] Input: add support for the STMicroelectronics FingerTip touchscreen

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Message-id: <a78e77c3-7bc5-95a8-fbf9-31baf91cdd56@samsung.com>
Date:   Thu, 16 Mar 2017 09:22:16 +0100
From:   Andrzej Hajda <a.hajda@...sung.com>
To:     Andi Shyti <andi.shyti@...sung.com>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Javier Martinez Canillas <javier@....samsung.com>
Cc:     linux-input@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
        Andi Shyti <andi@...zian.org>
Subject: Re: [PATCH v2 2/3] Input: add support for the STMicroelectronics
 FingerTip touchscreen

Hi Andi,

On 10.02.2017 03:17, Andi Shyti wrote:
(...)
> +
> +	err = devm_request_threaded_irq(&client->dev, client->irq,
> +					NULL, stmfts_irq_handler,
> +					IRQF_ONESHOT | IRQF_TRIGGER_LOW,
> +					"stmfts_irq", sdata);
> +	if (err)
> +		return err;
> +
> +	/*
> +	 * Disable irq they, they are not needed at this stage.
> +	 * One possible case when an IRQ can be already rased is e.g. if the
> +	 * regulator is set as always on and the stmfts device sends an IRQ as
> +	 * soon as it gets powered, de-synchronizing the power on sequence.
> +	 * During power on, the device will be reset and all the initialization
> +	 * IRQ will be resent.
> +	 */
> +	disable_irq(sdata->client->irq);

It is safer to set:
    irq_set_status_flags(client->irq, IRQ_NOAUTOEN);
before devm_request_threaded_irq

Regards
Andrzej