linux-kernel - [PATCH] ASoC: max98373: Added 10ms delay after amp software reset

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Date:   Wed, 22 Aug 2018 17:15:19 -0700
From:   Ryan Lee <ryans.lee@...imintegrated.com>
To:     lgirdwood@...il.com, broonie@...nel.org, perex@...ex.cz,
        tiwai@...e.com, ryans.lee@...imintegrated.com,
        kuninori.morimoto.gx@...esas.com, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org
Cc:     ryan.lee.maxim@...il.com
Subject: [PATCH] ASoC: max98373: Added 10ms delay after amp software reset

Signed-off-by: Ryan Lee <ryans.lee@...imintegrated.com>
---
 Changes : Applied 10ms delay after amp software reset.
           10ms guard time is required for stability.
 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 2764fae..6aaff03 100644
--- a/sound/soc/codecs/max98373.c
+++ b/sound/soc/codecs/max98373.c
@@ -730,6 +730,7 @@ static int max98373_probe(struct snd_soc_component *component)
 	/* Software Reset */
 	regmap_write(max98373->regmap,
 		MAX98373_R2000_SW_RESET, MAX98373_SOFT_RESET);
+	mdelay(10);
 
 	/* IV default slot configuration */
 	regmap_write(max98373->regmap,
@@ -818,6 +819,7 @@ static int max98373_resume(struct device *dev)
 
 	regmap_write(max98373->regmap,
 		MAX98373_R2000_SW_RESET, MAX98373_SOFT_RESET);
+	mdelay(10);
 	regcache_cache_only(max98373->regmap, false);
 	regcache_sync(max98373->regmap);
 	return 0;
-- 
2.7.4