[alsa-devel] [PATCH 4/4] ASoC: Use DC servo startup mode when not doing DCS correction

[Mark Brown]

Devices which do not have a DCS correction applied can use the explicit
DC servo startup mode for optimal startup performance. This most
immediately affects the WM8958.

Signed-off-by: Mark Brown <broonie at opensource.wolfsonmicro.com>
---
 sound/soc/codecs/wm_hubs.c |   20 ++++++++++++++------
 1 files changed, 14 insertions(+), 6 deletions(-)

diff --git a/sound/soc/codecs/wm_hubs.c b/sound/soc/codecs/wm_hubs.c
index e7a19d6..b24ba9f 100644
--- a/sound/soc/codecs/wm_hubs.c
+++ b/sound/soc/codecs/wm_hubs.c
@@ -105,12 +105,20 @@ static void calibrate_dc_servo(struct snd_soc_codec *codec)
 		return;
 	}
 
-	/* Set for 32 series updates */
-	snd_soc_update_bits(codec, WM8993_DC_SERVO_1,
-			    WM8993_DCS_SERIES_NO_01_MASK,
-			    32 << WM8993_DCS_SERIES_NO_01_SHIFT);
-	wait_for_dc_servo(codec,
-			  WM8993_DCS_TRIG_SERIES_0 | WM8993_DCS_TRIG_SERIES_1);
+	/* Devices not using a DCS code correction have startup mode */
+	if (hubs->dcs_codes) {
+		/* Set for 32 series updates */
+		snd_soc_update_bits(codec, WM8993_DC_SERVO_1,
+				    WM8993_DCS_SERIES_NO_01_MASK,
+				    32 << WM8993_DCS_SERIES_NO_01_SHIFT);
+		wait_for_dc_servo(codec,
+				  WM8993_DCS_TRIG_SERIES_0 |
+				  WM8993_DCS_TRIG_SERIES_1);
+	} else {
+		wait_for_dc_servo(codec,
+				  WM8993_DCS_TRIG_STARTUP_0 |
+				  WM8993_DCS_TRIG_STARTUP_1);
+	}
 
 	/* Different chips in the family support different readback
 	 * methods.
-- 
1.7.1