2015-09-11 16:32:00 +00:00
|
|
|
From 463e74adc05d41470cfecde946f98ebc59d89b4f Mon Sep 17 00:00:00 2001
|
2015-07-17 12:48:39 +00:00
|
|
|
From: Daniel Matuschek <info@crazy-audio.com>
|
|
|
|
|
Date: Wed, 15 Jan 2014 21:41:23 +0100
|
2015-09-11 16:32:00 +00:00
|
|
|
Subject: [PATCH 040/171] ASoC: wm8804: Implement MCLK configuration options,
|
2015-07-17 12:48:39 +00:00
|
|
|
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 | \
|
