linux-kernel - Re: [PATCH v2 16/19] ASoC: tlv320aic31xx: Add short circuit detection support

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Date:   Fri, 1 Dec 2017 13:39:30 +0000
From:   Mark Brown <broonie@...nel.org>
To:     "Andrew F. Davis" <afd@...com>
Cc:     Liam Girdwood <lgirdwood@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Benoît Cousson <bcousson@...libre.com>,
        Tony Lindgren <tony@...mide.com>, alsa-devel@...a-project.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 16/19] ASoC: tlv320aic31xx: Add short circuit
 detection support

On Wed, Nov 29, 2017 at 03:32:57PM -0600, Andrew F. Davis wrote:

> +static irqreturn_t aic31xx_irq(int irq, void *data)
> +{
> +	struct aic31xx_priv *aic31xx = (struct aic31xx_priv *)data;

There is no need to cast away from void, doing so can only mask bugs.

> +	ret = regmap_read(aic31xx->regmap, AIC31XX_INTRDACFLAG, &value);
> +	if (ret) {
> +		dev_err(dev, "Failed to read interrupt mask: %d\n", ret);
> +		return IRQ_NONE;
> +	}
> +
> +	if (value & AIC31XX_HPLSCDETECT)
> +		dev_err(dev, "Short circuit on Left output is detected\n");
> +	if (value & AIC31XX_HPRSCDETECT)
> +		dev_err(dev, "Short circuit on Right output is detected\n");
> +
> +	return IRQ_HANDLED;

This will report the interrupt as handled even if we didn't see an
interrupt we understand which will break shared interrupt lines.  At the
very least we should log other interrupt sources numerically.

> +	if (aic31xx->irq > 0) {
> +		regmap_update_bits(aic31xx->regmap, AIC31XX_GPIO1,
> +				   AIC31XX_GPIO1_FUNC_MASK,
> +				   AIC31XX_GPIO1_INT1 <<
> +				   AIC31XX_GPIO1_FUNC_SHIFT);

Is the interrupt only available on GPIO1?

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