From 307f31452078792aab94a729fce33200c6e42dc4 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Martin=20Povi=C5=A1er?= <povik+lin@cutebit.org>
Date: Fri, 4 Feb 2022 10:53:01 +0100
Subject: [PATCH] ASoC: tas2770: Insert post reset delay
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Git-commit: 307f31452078792aab94a729fce33200c6e42dc4
Patch-mainline: v5.17-rc5
References: git-fixes

Per TAS2770 datasheet there must be a 1 ms delay from reset to first
command. So insert delays into the driver where appropriate.

Fixes: 1a476abc723e ("tas2770: add tas2770 smart PA kernel driver")
Signed-off-by: Martin Povišer <povik+lin@cutebit.org>
Link: https://lore.kernel.org/r/20220204095301.5554-1-povik+lin@cutebit.org
Signed-off-by: Mark Brown <broonie@kernel.org>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 sound/soc/codecs/tas2770.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/sound/soc/codecs/tas2770.c b/sound/soc/codecs/tas2770.c
index 6549e7fef3e3..c5ea3b115966 100644
--- a/sound/soc/codecs/tas2770.c
+++ b/sound/soc/codecs/tas2770.c
@@ -38,10 +38,12 @@ static void tas2770_reset(struct tas2770_priv *tas2770)
 		gpiod_set_value_cansleep(tas2770->reset_gpio, 0);
 		msleep(20);
 		gpiod_set_value_cansleep(tas2770->reset_gpio, 1);
+		usleep_range(1000, 2000);
 	}
 
 	snd_soc_component_write(tas2770->component, TAS2770_SW_RST,
 		TAS2770_RST);
+	usleep_range(1000, 2000);
 }
 
 static int tas2770_set_bias_level(struct snd_soc_component *component,
@@ -110,6 +112,7 @@ static int tas2770_codec_resume(struct snd_soc_component *component)
 
 	if (tas2770->sdz_gpio) {
 		gpiod_set_value_cansleep(tas2770->sdz_gpio, 1);
+		usleep_range(1000, 2000);
 	} else {
 		ret = snd_soc_component_update_bits(component, TAS2770_PWR_CTRL,
 						    TAS2770_PWR_CTRL_MASK,
@@ -510,8 +513,10 @@ static int tas2770_codec_probe(struct snd_soc_component *component)
 
 	tas2770->component = component;
 
-	if (tas2770->sdz_gpio)
+	if (tas2770->sdz_gpio) {
 		gpiod_set_value_cansleep(tas2770->sdz_gpio, 1);
+		usleep_range(1000, 2000);
+	}
 
 	tas2770_reset(tas2770);
 
-- 
2.31.1