linux-kernel - Re: [PATCH 5/5] ASoC: dwc: Ensure FIFOs are flushed to prevent channel swap

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Date:	Wed, 3 Dec 2014 17:38:54 +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 5/5] ASoC: dwc: Ensure FIFOs are flushed to prevent
 channel swap

On Wed, Dec 03, 2014 at 04:39:14PM +0000, Andrew Jackson wrote:
> If the FIFOs aren't flushed, the left/right channels may be swapped:
> this may occur if the FIFOs are not empty when the streams start.

>  	/* Iterate over set of channels - independently controlled. */
>  	do {
>  		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
> +			i2s_write_reg(dev->i2s_base, TXFFR, 1);

This is an example of the problem with putting fixes at the end of the
series - this can't be applied without your previous change to add the
support for more channels (which is a new feature).

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