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From dca34e0a5c4f9c77cbdb24f95e780e198d64013a Mon Sep 17 00:00:00 2001
From: Daniel Matuschek <info@crazy-audio.com>
Date: Wed, 15 Jan 2014 21:41:23 +0100
Subject: [PATCH] ASoC: wm8804: Implement MCLK configuration options, add 32bit
support WM8804 can run with PLL frequencies of 256xfs and 128xfs for most
sample rates. At 192kHz only 128xfs is supported. The existing driver selects
128xfs automatically for some lower samples rates. By using an additional
mclk_div divider, it is now possible to control the behaviour. This allows
using 256xfs PLL frequency on all sample rates up to 96kHz. It should allow
lower jitter and better signal quality. The behavior has to be controlled by
the sound card driver, because some sample frequency share the same setting.
e.g. 192kHz and 96kHz use 24.576MHz master clock. The only difference is the
MCLK divider.
This also added support for 32bit data.
Signed-off-by: Daniel Matuschek <daniel@matuschek.net>
---
sound/soc/codecs/wm8804.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/sound/soc/codecs/wm8804.c
+++ b/sound/soc/codecs/wm8804.c
@@ -304,6 +304,7 @@ static int wm8804_hw_params(struct snd_p
blen = 0x1;
break;
case 24:
+ case 32:
blen = 0x2;
break;
default:
@@ -515,7 +516,7 @@ static const struct snd_soc_dai_ops wm88
};
#define WM8804_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE | \
- SNDRV_PCM_FMTBIT_S24_LE)
+ SNDRV_PCM_FMTBIT_S24_3LE | SNDRV_PCM_FMTBIT_S32_LE)
#define WM8804_RATES (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_64000 | \
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