Commit FS#12111 by Stephan Grossklass. Disables output mixer auto gain control on AMSv2. Should fix occasional distortion reported when running the player at very high output levels (e.g. at or above 0dB).

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@30208 a1c6a512-1295-4272-9138-f99709370657

2 files changed, 5 insertions, 1 deletions

diff --git a/firmware/drivers/audio/as3514.c b/firmware/drivers/audio/as3514.c
index 1774932c51..64531cfc2b 100644
--- a/firmware/drivers/audio/as3514.c
+++ b/firmware/drivers/audio/as3514.c
@@ -151,7 +151,7 @@ void audiohw_preinit(void)
 #ifdef HAVE_AS3543
 
     as3514_write(AS3514_AUDIOSET1, AUDIOSET1_DAC_on | AUDIOSET1_DAC_GAIN_on);
-    as3514_write(AS3514_AUDIOSET2, AUDIOSET2_HPH_QUALITY_LOW_POWER);
+    as3514_write(AS3514_AUDIOSET2, AUDIOSET2_AGC_off | AUDIOSET2_HPH_QUALITY_LOW_POWER);
     /* common ground on, delay playback unmuting when inserting headphones */
     as3514_write(AS3514_AUDIOSET3, AUDIOSET3_HPCM_on | AUDIOSET3_HP_LONGSTART);
 
diff --git a/firmware/export/as3514.h b/firmware/export/as3514.h
index dfe0f8017f..0bfd445469 100644
--- a/firmware/export/as3514.h
+++ b/firmware/export/as3514.h
@@ -300,6 +300,10 @@ extern void audiohw_set_sampr_dividers(int fsel);
 
 /* AUDIOSET2 (15h) */
 #ifdef HAVE_AS3543
+#define AUDIOSET2_BIAS_on      (0x0 << 7)
+#define AUDIOSET2_BIAS_off      (0x1 << 7)
+#define AUDIOSET2_SUM_off      (0x1 << 6)
+#define AUDIOSET2_AGC_off       (0x1 << 5)
 #define AUDIOSET2_HPH_QUALITY_LOW_POWER (0x0 << 4)
 #define AUDIOSET2_HPH_QUALITY_HIGH      (0x1 << 4)
 #else