2014-09-27 19:11:37 +00:00
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From 5b06b2affe65b243dd828aeac9f48854902b1823 Mon Sep 17 00:00:00 2001
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From: Florian Meier <florian.meier@koalo.de>
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Date: Fri, 6 Dec 2013 18:55:53 +0100
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Subject: [PATCH 40/54] ASoC: BCM2708: Add 24 bit support
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This adds 24 bit support to the I2S driver of the BCM2708.
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Besides enabling the 24 bit flags, it includes two bug fixes:
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MMAP is not supported. Claiming this leads to strange issues
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when the format of driver and file do not match.
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The datasheet states that the width extension bit should be set
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for widths greater than 24, but greater or equal would be correct.
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This follows from the definition of the width field.
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Signed-off-by: Florian Meier <florian.meier@koalo.de>
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---
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sound/soc/bcm/bcm2708-i2s.c | 13 +++++++++----
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1 file changed, 9 insertions(+), 4 deletions(-)
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--- a/sound/soc/bcm/bcm2708-i2s.c
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+++ b/sound/soc/bcm/bcm2708-i2s.c
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2014-12-08 12:04:25 +00:00
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@@ -346,6 +346,10 @@ static int bcm2708_i2s_hw_params(struct
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2014-09-27 19:11:37 +00:00
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data_length = 16;
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bclk_ratio = 40;
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break;
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+ case SNDRV_PCM_FORMAT_S24_LE:
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+ data_length = 24;
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+ bclk_ratio = 40;
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+ break;
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case SNDRV_PCM_FORMAT_S32_LE:
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data_length = 32;
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bclk_ratio = 80;
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2014-12-08 12:04:25 +00:00
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@@ -424,7 +428,7 @@ static int bcm2708_i2s_hw_params(struct
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2014-09-27 19:11:37 +00:00
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/* Setup the frame format */
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format = BCM2708_I2S_CHEN;
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- if (data_length > 24)
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+ if (data_length >= 24)
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format |= BCM2708_I2S_CHWEX;
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format |= BCM2708_I2S_CHWID((data_length-8)&0xf);
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2014-12-08 12:04:25 +00:00
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@@ -714,6 +718,7 @@ static struct snd_soc_dai_driver bcm2708
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2014-09-27 19:11:37 +00:00
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.channels_max = 2,
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.rates = SNDRV_PCM_RATE_8000_192000,
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.formats = SNDRV_PCM_FMTBIT_S16_LE
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+ | SNDRV_PCM_FMTBIT_S24_LE
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| SNDRV_PCM_FMTBIT_S32_LE
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},
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.capture = {
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2014-12-08 12:04:25 +00:00
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@@ -721,6 +726,7 @@ static struct snd_soc_dai_driver bcm2708
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2014-09-27 19:11:37 +00:00
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.channels_max = 2,
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.rates = SNDRV_PCM_RATE_8000_192000,
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.formats = SNDRV_PCM_FMTBIT_S16_LE
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+ | SNDRV_PCM_FMTBIT_S24_LE
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| SNDRV_PCM_FMTBIT_S32_LE
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},
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.ops = &bcm2708_i2s_dai_ops,
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@@ -810,11 +816,10 @@ static void bcm2708_i2s_setup_gpio(void)
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}
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static const struct snd_pcm_hardware bcm2708_pcm_hardware = {
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- .info = SNDRV_PCM_INFO_MMAP |
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- SNDRV_PCM_INFO_MMAP_VALID |
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- SNDRV_PCM_INFO_INTERLEAVED |
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+ .info = SNDRV_PCM_INFO_INTERLEAVED |
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SNDRV_PCM_INFO_JOINT_DUPLEX,
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.formats = SNDRV_PCM_FMTBIT_S16_LE |
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+ SNDRV_PCM_FMTBIT_S24_LE |
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SNDRV_PCM_FMTBIT_S32_LE,
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.period_bytes_min = 32,
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.period_bytes_max = 64 * PAGE_SIZE,
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