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- From f33231bfe57c745235a346d5529a4bac717d925e 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 037/114] 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
- @@ -278,6 +278,7 @@ static int wm8804_hw_params(struct snd_p
- blen = 0x1;
- break;
- case 24:
- + case 32:
- blen = 0x2;
- break;
- default:
- @@ -624,7 +625,7 @@ 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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