linux-kernel - Re: [alsa-devel] [PATCH 7/9] ASoC: da7210: Add support for ALC and Noise suppression

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Message-ID: <20111012150404.GT3647@opensource.wolfsonmicro.com>
Date:	Wed, 12 Oct 2011 16:04:04 +0100
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Ashish Chavan <ashish.chavan@...tcummins.com>
Cc:	lrg@...com, alsa-devel <alsa-devel@...a-project.org>,
	David Dajun Chen <david.chen@...semi.com>,
	kuninori.morimoto.gx@...esas.com,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [alsa-devel] [PATCH 7/9] ASoC: da7210: Add support for ALC and
 Noise suppression

On Wed, Oct 12, 2011 at 08:37:50PM +0530, Ashish Chavan wrote:

> +	if (ucontrol->value.integer.value[0]) {
> +		/* Check if noise suppression is enabled */
> +		if (reg_cache[DA7210_CONTROL] & DA7210_NOISE_SUP_EN) {

No, don't go peering directly into the register cache.  This is going to
explode if the board configures a different cache style and means you
can't change the cache type later.  Just read the register and trust
that the cache will do something sane.

> +			dev_dbg(codec->dev, "Failed to enable ALC\n");
> +			return -EPERM;
> +		}

Either drop the debug print or make it say what the problem is.

similar problems in the rest of the patch.

> +	SOC_SINGLE("ALC Capture Max Gain", DA7210_ALC_MAX, 0, 0x3F, 0),
> +	SOC_SINGLE("ALC Capture Min Gain", DA7210_ALC_MIN, 0, 0x3F, 0),
> +	SOC_SINGLE("ALC Capture Noise Gain", DA7210_ALC_NOIS, 0, 0x3F, 0),

Volume.
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