linux-kernel - [PATCH v2 2/2] ASoC: dwc: Enable 24 bit sample size in PIO mode

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Message-Id: <4208c77798e92cfeb7305add296b6eb414c96f27.1483969112.git.joabreu@synopsys.com>
Date:   Mon,  9 Jan 2017 13:43:28 +0000
From:   Jose Abreu <Jose.Abreu@...opsys.com>
To:     alsa-devel@...a-project.org
Cc:     Jose Abreu <Jose.Abreu@...opsys.com>,
        Carlos Palminha <CARLOS.PALMINHA@...opsys.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>, linux-kernel@...r.kernel.org
Subject: [PATCH v2 2/2] ASoC: dwc: Enable 24 bit sample size in PIO mode

Sample size of 24 bits use in reality 32 bits for storage. We
can safelly enable this sample size and treat the data as
32 bits.

Tested in a x86_64 platform and in ARC AXS101 SDP platform.

Signed-off-by: Jose Abreu <joabreu@...opsys.com>
Cc: Carlos Palminha <palminha@...opsys.com>
Cc: Liam Girdwood <lgirdwood@...il.com>
Cc: Mark Brown <broonie@...nel.org>
Cc: Jaroslav Kysela <perex@...ex.cz>
Cc: Takashi Iwai <tiwai@...e.com>
Cc: alsa-devel@...a-project.org
Cc: linux-kernel@...r.kernel.org
---
 sound/soc/dwc/designware_pcm.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sound/soc/dwc/designware_pcm.c b/sound/soc/dwc/designware_pcm.c
index b063c86..459ec86 100644
--- a/sound/soc/dwc/designware_pcm.c
+++ b/sound/soc/dwc/designware_pcm.c
@@ -80,6 +80,7 @@
 	.rate_min = 32000,
 	.rate_max = 48000,
 	.formats = SNDRV_PCM_FMTBIT_S16_LE |
+		SNDRV_PCM_FMTBIT_S24_LE |
 		SNDRV_PCM_FMTBIT_S32_LE,
 	.channels_min = 2,
 	.channels_max = 2,
@@ -175,6 +176,7 @@ static int dw_pcm_hw_params(struct snd_pcm_substream *substream,
 		dev->tx_fn = dw_pcm_tx_16;
 		dev->rx_fn = dw_pcm_rx_16;
 		break;
+	case SNDRV_PCM_FORMAT_S24_LE:
 	case SNDRV_PCM_FORMAT_S32_LE:
 		dev->tx_fn = dw_pcm_tx_32;
 		dev->rx_fn = dw_pcm_rx_32;
-- 
1.9.1