linux-kernel - Re: [PATCH v3 4/5] ALSA: pcm_dmaengine: Correct support for 24bits physical sample widths

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Date:	Thu, 03 Jul 2014 10:29:22 +0200
From:	Lars-Peter Clausen <lars@...afoo.de>
To:	Peter Ujfalusi <peter.ujfalusi@...com>, vinod.koul@...el.com,
	dan.j.williams@...el.com, tiwai@...e.de,
	Mark Brown <broonie@...nel.org>,
	Liam Girdwood <lgirdwood@...il.com>, joelf@...com,
	nsekhar@...com
CC:	linux-kernel@...r.kernel.org, alsa-devel@...a-project.org,
	dmaengine@...r.kernel.org
Subject: Re: [PATCH v3 4/5] ALSA: pcm_dmaengine: Correct support for 24bits
 physical sample widths

On 07/03/2014 06:51 AM, Peter Ujfalusi wrote:
> In case of _3LE/_3BE formats the samples are stored in 3 consecutive bytes
> without padding it to 4 bytes. This means that the DMA needs to be able to
> support 3 bytes word length in order to read/write the samples from memory
> correctly. Originally the code treated 24 bits physical length samples as
> they were 32 bits which leads to corruption when playing or recording audio.
>
> The hw.formats field has already been prepared to exclude formats not
> supported by the DMA engine in use, which means that only on platforms where
> 3 bytes is supported by the DMA will be able to use this format.
>
> Signed-off-by: Peter Ujfalusi <peter.ujfalusi@...com>

Acked-by: Lars-Peter Clausen <lars@...afoo.de>

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