linux-kernel - [PATCH 2/3] ASoC:codec:max98373: Added 30ms turn on/off time delay

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Message-Id: <20210325033555.29377-2-ryans.lee@maximintegrated.com>
Date:   Wed, 24 Mar 2021 20:35:54 -0700
From:   Ryan Lee <ryans.lee@...imintegrated.com>
To:     lgirdwood@...il.com, broonie@...nel.org, perex@...ex.cz,
        tiwai@...e.com, pierre-louis.bossart@...ux.intel.com,
        kai.vehmanen@...ux.intel.com, yung-chuan.liao@...ux.intel.com,
        rander.wang@...ux.intel.com, ryans.lee@...imintegrated.com,
        guennadi.liakhovetski@...ux.intel.com, vkoul@...nel.org,
        yong.zhi@...el.com, judyhsiao@...gle.com,
        alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Cc:     ryan.lee.maxim@...il.com
Subject: [PATCH 2/3] ASoC:codec:max98373: Added 30ms turn on/off time delay

Amp requires 10 ~ 30ms for the power ON and OFF.
Added 30ms delay for stability.

Signed-off-by: Ryan Lee <ryans.lee@...imintegrated.com>
---
 sound/soc/codecs/max98373.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sound/soc/codecs/max98373.c b/sound/soc/codecs/max98373.c
index 746c829312b8..1346a98ce8a1 100644
--- a/sound/soc/codecs/max98373.c
+++ b/sound/soc/codecs/max98373.c
@@ -28,11 +28,13 @@ static int max98373_dac_event(struct snd_soc_dapm_widget *w,
 		regmap_update_bits(max98373->regmap,
 			MAX98373_R20FF_GLOBAL_SHDN,
 			MAX98373_GLOBAL_EN_MASK, 1);
+		usleep_range(30000, 31000);
 		break;
 	case SND_SOC_DAPM_POST_PMD:
 		regmap_update_bits(max98373->regmap,
 			MAX98373_R20FF_GLOBAL_SHDN,
 			MAX98373_GLOBAL_EN_MASK, 0);
+		usleep_range(30000, 31000);
 		max98373->tdm_mode = false;
 		break;
 	default:
-- 
2.17.1