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Date:   Wed, 29 Nov 2017 09:36:50 +0100
From:   Takashi Iwai <>
To:     " Maciej S. Szmigiero " <>
Cc:     "Nicolin Chen" <>,
        "Xiubo Li" <>,
        "Jaroslav Kysela" <>, "Timur Tabi" <>,
        "Liam Girdwood" <>,
        "Mark Brown" <>, <>,
        "Fabio Estevam" <>,
        "Takashi Sakamoto" <>,
        "linux-kernel" <>
Subject: Re: [PATCH v4 1/2] ALSA: pcm: add SNDRV_PCM_FORMAT_{S,U}20

On Mon, 27 Nov 2017 23:33:29 +0100,
 Maciej S. Szmigiero  wrote:
> This format is similar to existing SNDRV_PCM_FORMAT_{S,U}20_3 that keep
> 20-bit PCM samples in 3 bytes, however i.MX6 platform SSI FIFO does not
> allow 3-byte accesses (including DMA) so a 4-byte (more conventional)
> format is needed for it.
> Signed-off-by: Maciej S. Szmigiero <>
> ---
> Changes from v1: Drop "_4" suffix from these formats since they aren't
> non-standard ones, use empty format slots starting from format number 25
> for them, add information that they are LSB justified formats.
> Changes from v2: Adapt a comment in sound/core/pcm_misc.c so it still
> refers to the same sample formats as before.
> Changes from v3: Make the comment style in include/uapi/sound/asound.h
> match the style of comments at other sample formats.
> Corresponding alsa-lib changes will be posted as soon as this patch is
> merged on the kernel side, to keep alsa-lib and kernel synchronized.

Applied to topic/pcm-20bit, also included in for-next.

Mark, please pull topic/pcm-20bit branch if you need to apply fsl_ssi
patch into your tree.



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