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

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);
 	}
 }