linux-kernel - Re: [PATCH v3 4/5] ASoC: tda998x: adjust the audio hw parameters from EDID

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Date:	Tue, 4 Feb 2014 18:06:25 +0000
From:	Mark Brown <broonie@...nel.org>
To:	Jean-Francois Moine <moinejf@...e.fr>
Cc:	alsa-devel@...a-project.org, Dave Airlie <airlied@...il.com>,
	dri-devel@...ts.freedesktop.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Rob Clark <robdclark@...il.com>,
	Russell King - ARM Linux <linux@....linux.org.uk>
Subject: Re: [PATCH v3 4/5] ASoC: tda998x: adjust the audio hw parameters
 from EDID

On Mon, Jan 27, 2014 at 09:48:54AM +0100, Jean-Francois Moine wrote:

> +		/* change the snd_soc_pcm_stream values of the driver */
> +		stream->rates = rate_mask;
> +		stream->channels_max = max_channels;
> +		stream->formats = formats;

> +	/* copy the DAI driver to a writable area */
> +	dai_drv = devm_kzalloc(&pdev->dev, sizeof(tda998x_dai), GFP_KERNEL);
> +	if (!dai_drv)
> +		return -ENOMEM;
> +	memcpy(dai_drv, tda998x_dai, sizeof(tda998x_dai));
> +

The code should be doing this by setting constraints based on the
current setup rather than by editing the data structure - the expecation
is very much that the data won't change so this prevents surprises with
future work on the core.

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