target/linux/brcm2708/patches-4.4/0548-Audioinjector-Fix-bit-offsets-for-equal-volume-and-a.patch

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