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Bypass the AS3543 audio mixer at higher volumes.

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This change reduces noise and distortion very slightly at higher volumes.

Change-Id: I1a2eb160c2956de90764c0bb11677fdac8d96dec
This commit is contained in:
Mihail Zenkov 2014-12-28 20:30:33 +01:00 • committed by Gerrit Rockbox
parent 163ca14e58
commit 42219b6e79
1 changed files with 30 additions and 5 deletions
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35
firmware/drivers/audio/as3514.c
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@ -131,8 +131,8 @@ void audiohw_preinit(void)
#ifdef HAVE_AS3543
as3514_write(AS3514_AUDIOSET1, AUDIOSET1_DAC_on | AUDIOSET1_DAC_GAIN_on);
as3514_write(AS3514_AUDIOSET2, AUDIOSET2_AGC_off | AUDIOSET2_HPH_QUALITY_LOW_POWER);
as3514_write(AS3514_AUDIOSET1, AUDIOSET1_DAC_on);
as3514_write(AS3514_AUDIOSET2, AUDIOSET2_SUM_off | 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);
@ -144,8 +144,8 @@ void audiohw_preinit(void)
/* Select Line 2 for FM radio */
as3514_set(AS3514_LINE_IN1_R, LINE_IN_R_LINE_SELECT);
#endif
/* Output SUM of microphone/line/DAC */
as3514_write(AS3514_HPH_OUT_R, HPH_OUT_R_HEADPHONES | HPH_OUT_R_HP_OUT_SUM);
/* Set LINEOUT to minimize pop-click noise in headphone on init stage */
as3514_write(AS3514_HPH_OUT_R, HPH_OUT_R_LINEOUT | HPH_OUT_R_HP_OUT_DAC);
#else
/* as3514/as3515 */
@ -216,6 +216,11 @@ void audiohw_preinit(void)
/* DAC_Mute_off */
as3514_set(AS3514_DAC_L, DAC_L_DAC_MUTE_off);
#ifdef HAVE_AS3543
/* DAC direct - gain, mixer and limitter bypassed */
as3514_write(AS3514_HPH_OUT_R, HPH_OUT_R_HEADPHONES | HPH_OUT_R_HP_OUT_DAC);
#endif
}
static void audiohw_mute(bool mute)
@ -291,7 +296,21 @@ void audiohw_set_volume(int vol_l, int vol_r)
} else {
mix_l = MIXER_MAX_VOLUME;
hph_l = vol_l - MIXER_MAX_VOLUME;
}
}
#ifdef HAVE_AS3543
if (!(as3514_regs[AS3514_HPH_OUT_R] & 0x40)) { /*if not radio or recording*/
if (!hph_l || !hph_r) { /*if volume higher, disable the mixer to slightly improve noise*/
as3514_write(AS3514_AUDIOSET1, AUDIOSET1_DAC_on | AUDIOSET1_DAC_GAIN_on);
as3514_write(AS3514_AUDIOSET2, AUDIOSET2_AGC_off | AUDIOSET2_HPH_QUALITY_LOW_POWER);
as3514_write_masked(AS3514_HPH_OUT_R, HPH_OUT_R_HP_OUT_SUM, HPH_OUT_R_HP_OUT_MASK);
} else {
as3514_write(AS3514_AUDIOSET1, AUDIOSET1_DAC_on);
as3514_write(AS3514_AUDIOSET2, AUDIOSET2_SUM_off | AUDIOSET2_AGC_off | AUDIOSET2_HPH_QUALITY_LOW_POWER);
as3514_write_masked(AS3514_HPH_OUT_R, HPH_OUT_R_HP_OUT_DAC, HPH_OUT_R_HP_OUT_MASK);
}
}
#endif
as3514_write_masked(AS3514_DAC_R, mix_r, AS3514_VOL_MASK);
as3514_write_masked(AS3514_DAC_L, mix_l, AS3514_VOL_MASK);
@ -464,6 +483,9 @@ void audiohw_set_recvol(int left, int right, int type)
void audiohw_set_monitor(bool enable)
{
if (enable) {
#ifdef HAVE_AS3543
as3514_write_masked(AS3514_HPH_OUT_R, HPH_OUT_R_HP_OUT_LINE, HPH_OUT_R_HP_OUT_MASK);
#endif
/* select either LIN1 or LIN2 */
as3514_write_masked(AS3514_AUDIOSET1, AUDIOSET1_LIN_on,
AUDIOSET1_LIN1_on | AUDIOSET1_LIN2_on);
@ -471,6 +493,9 @@ void audiohw_set_monitor(bool enable)
as3514_set(AS3514_LINE_IN_L, LINE_IN1_L_LI1L_MUTE_off);
}
else {
#ifdef HAVE_AS3543
as3514_write_masked(AS3514_HPH_OUT_R, HPH_OUT_R_HP_OUT_DAC, HPH_OUT_R_HP_OUT_MASK);
#endif
/* turn off both LIN1 and LIN2 (if present) */
as3514_clear(AS3514_LINE_IN1_R, LINE_IN1_R_LI1R_MUTE_off);
as3514_clear(AS3514_LINE_IN1_L, LINE_IN1_L_LI1L_MUTE_off);