linux-kernel - Re: [PATCH 3/5] ASoC: dwc: Iterate over all channels

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Message-ID: <20141203172928.GD7712@sirena.org.uk>
Date:	Wed, 3 Dec 2014 17:29:28 +0000
From:	Mark Brown <broonie@...nel.org>
To:	Andrew Jackson <Andrew.Jackson@....com>
Cc:	Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.de>,
	"alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Rajeev Kumar <rajeevkumar.linux@...il.com>,
	Liam Girdwood <lgirdwood@...il.com>,
	Liviu Dudau <Liviu.Dudau@....com>
Subject: Re: [PATCH 3/5] ASoC: dwc: Iterate over all channels

On Wed, Dec 03, 2014 at 04:39:01PM +0000, Andrew Jackson wrote:

> +	/* Iterate over set of channels - independently controlled.
> +	 */
> +	do {
> +		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
> +			i2s_write_reg(dev->i2s_base, TCR(ch_reg),
> +				      xfer_resolution);
> +			i2s_write_reg(dev->i2s_base, TFCR(ch_reg), 0x02);
> +			irq = i2s_read_reg(dev->i2s_base, IMR(ch_reg));
> +			i2s_write_reg(dev->i2s_base, IMR(ch_reg), irq & ~0x30);
> +			i2s_write_reg(dev->i2s_base, TER(ch_reg), 1);
> +		} else {
> +			i2s_write_reg(dev->i2s_base, RCR(ch_reg),
> +				      xfer_resolution);
> +			i2s_write_reg(dev->i2s_base, RFCR(ch_reg), 0x07);
> +			irq = i2s_read_reg(dev->i2s_base, IMR(ch_reg));
> +			i2s_write_reg(dev->i2s_base, IMR(ch_reg), irq & ~0x03);
> +			i2s_write_reg(dev->i2s_base, RER(ch_reg), 1);
> +		}
> +	} while (ch_reg-- > 0);

The normal way to write an iteration would be with a for loop - why are
we not doing that?

Also I see that you've not sent these as a single thread - please use
--thread.

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