linux-kernel - [PATCH 3.16 02/72] ASoC: sgtl5000: fix VAG power up timing

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Date:   Sun, 08 Dec 2019 13:52:46 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Mark Brown" <broonie@...nel.org>,
        "Jean-Michel Hautbois" <jhautbois@...il.com>,
        "Jean-Michel Hautbois" <jean-michel.hautbois@...-labs.com>
Subject: [PATCH 3.16 02/72] ASoC: sgtl5000: fix VAG power up timing

3.16.79-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Jean-Michel Hautbois <jhautbois@...il.com>

commit c803cc2dcd722e08020c1ba63bb5ceece4a19fdb upstream.

When power up, a "pop" is heard on line-in and mic-in.
An analysis of the PCM shows it lasts ~400ms
and looks like a filter response.
VAG power up should be delayed by 400ms as VAG power down is.

Signed-off-by: Jean-Michel Hautbois <jean-michel.hautbois@...-labs.com>
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 sound/soc/codecs/sgtl5000.c | 1 +
 1 file changed, 1 insertion(+)

--- a/sound/soc/codecs/sgtl5000.c
+++ b/sound/soc/codecs/sgtl5000.c
@@ -175,6 +175,7 @@ static int power_vag_event(struct snd_so
 	case SND_SOC_DAPM_POST_PMU:
 		snd_soc_update_bits(w->codec, SGTL5000_CHIP_ANA_POWER,
 			SGTL5000_VAG_POWERUP, SGTL5000_VAG_POWERUP);
+		msleep(400);
 		break;
 
 	case SND_SOC_DAPM_PRE_PMD: