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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

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