1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
|
From 80531f433182a0db5da749045a6e3f48bf4277db Mon Sep 17 00:00:00 2001
From: Matt Flax <flatmax@flatmax.org>
Date: Sun, 20 Nov 2016 19:15:24 +1100
Subject: [PATCH] [Audioinjector] Fix bit offsets for equal volume and add 8
kHz operation (#1727)
Applying to the audioinjector sound card only. This patch offsets channel
2 correctly from the LR clock. This ensures that channel 2 doesn't loose
any bits during capture. It also results in both channels 1 and 2 having
the same volume. This commit also adds 8 kHz operation.
Signed-off-by: Matt Flax <flatmax@flatmax.org>
---
sound/soc/bcm/audioinjector-pi-soundcard.c | 16 +++++++++-------
1 file changed, 9 insertions(+), 7 deletions(-)
--- a/sound/soc/bcm/audioinjector-pi-soundcard.c
+++ b/sound/soc/bcm/audioinjector-pi-soundcard.c
@@ -30,7 +30,7 @@
#include "../codecs/wm8731.h"
static const unsigned int bcm2835_rates_12000000[] = {
- 32000, 44100, 48000, 96000, 88200,
+ 8000, 16000, 32000, 44100, 48000, 96000, 88200,
};
static struct snd_pcm_hw_constraint_list bcm2835_constraints_12000000 = {
@@ -55,19 +55,21 @@ static int snd_audioinjector_pi_soundcar
switch (params_rate(params)){
case 8000:
- return snd_soc_dai_set_bclk_ratio(cpu_dai, 1508);
+ return snd_soc_dai_set_bclk_ratio(cpu_dai, 1);
+ case 16000:
+ return snd_soc_dai_set_bclk_ratio(cpu_dai, 750);
case 32000:
- return snd_soc_dai_set_bclk_ratio(cpu_dai, 378);
+ return snd_soc_dai_set_bclk_ratio(cpu_dai, 375);
case 44100:
- return snd_soc_dai_set_bclk_ratio(cpu_dai, 274);
+ return snd_soc_dai_set_bclk_ratio(cpu_dai, 272);
case 48000:
- return snd_soc_dai_set_bclk_ratio(cpu_dai, 252);
+ return snd_soc_dai_set_bclk_ratio(cpu_dai, 250);
case 88200:
return snd_soc_dai_set_bclk_ratio(cpu_dai, 136);
case 96000:
- return snd_soc_dai_set_bclk_ratio(cpu_dai, 126);
+ return snd_soc_dai_set_bclk_ratio(cpu_dai, 125);
default:
- return snd_soc_dai_set_bclk_ratio(cpu_dai, 126);
+ return snd_soc_dai_set_bclk_ratio(cpu_dai, 125);
}
}
|
