2016-09-10 12:54:26 +00:00
|
|
|
From 34e0545c33b0f444a5dd8c066cfe37420e95db33 Mon Sep 17 00:00:00 2001
|
2016-01-17 10:42:23 +00:00
|
|
|
From: Daniel Matuschek <info@crazy-audio.com>
|
|
|
|
|
Date: Wed, 15 Jan 2014 21:41:23 +0100
|
2016-09-10 12:54:26 +00:00
|
|
|
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.
|
2016-01-17 10:42:23 +00:00
|
|
|
|
|
|
|
|
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 | \
|
