linux-kernel - Applied "ASoC: da7219: Reset codec gracefully, if still active" to the asoc tree

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Message-Id: <E1boZ0S-0007BD-Id@finisterre>
Date:   Mon, 26 Sep 2016 09:43:52 -0700
From:   Mark Brown <broonie@...nel.org>
To:     Adam Thomson <Adam.Thomson.Opensource@...semi.com>
Cc:     Mark Brown <broonie@...nel.org>, Mark Brown <broonie@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>, alsa-devel@...a-project.org,
        Support Opensource <support.opensource@...semi.com>,
        Xing Zheng <zhengxing@...k-chips.com>,
        linux-kernel@...r.kernel.org, Hsin-Yu Chao <hychao@...omium.org>,
        Sathyanarayana Nujella <sathyanarayana.nujella@...el.com>,
        alsa-devel@...a-project.org
Subject: Applied "ASoC: da7219: Reset codec gracefully, if still active" to the asoc tree

The patch

   ASoC: da7219: Reset codec gracefully, if still active

has been applied to the asoc tree at

   git://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git 

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

>From a7f16ea90ecffde4d4915eb7c81b11428e636920 Mon Sep 17 00:00:00 2001
From: Adam Thomson <Adam.Thomson.Opensource@...semi.com>
Date: Mon, 26 Sep 2016 14:29:20 +0100
Subject: [PATCH] ASoC: da7219: Reset codec gracefully, if still active

Currently the reset code in i2c_probe only resets the AAD part of
the device and not the entire codec. This patch updates the driver
to resolve this and ensures that if the codec is still active from
a previous boot then the audio paths are powered down prior to
reset.

Signed-off-by: Adam Thomson <Adam.Thomson.Opensource@...semi.com>
Signed-off-by: Mark Brown <broonie@...nel.org>
---
 sound/soc/codecs/da7219.c | 30 +++++++++++++++++++++++++++---
 sound/soc/codecs/da7219.h |  5 +++++
 2 files changed, 32 insertions(+), 3 deletions(-)

diff --git a/sound/soc/codecs/da7219.c b/sound/soc/codecs/da7219.c
index 9d08c11b6f14..eecb6d6c29cf 100644
--- a/sound/soc/codecs/da7219.c
+++ b/sound/soc/codecs/da7219.c
@@ -1925,7 +1925,8 @@ static int da7219_i2c_probe(struct i2c_client *i2c,
 			    const struct i2c_device_id *id)
 {
 	struct da7219_priv *da7219;
-	int ret;
+	unsigned int system_active, system_status;
+	int i, ret;
 
 	da7219 = devm_kzalloc(&i2c->dev, sizeof(struct da7219_priv),
 			      GFP_KERNEL);
@@ -1941,14 +1942,37 @@ static int da7219_i2c_probe(struct i2c_client *i2c,
 		return ret;
 	}
 
-	/* Software reset codec. */
+	regcache_cache_bypass(da7219->regmap, true);
+
+	/* Disable audio paths if still active from previous start */
+	regmap_read(da7219->regmap, DA7219_SYSTEM_ACTIVE, &system_active);
+	if (system_active) {
+		regmap_write(da7219->regmap, DA7219_GAIN_RAMP_CTRL,
+			     DA7219_GAIN_RAMP_RATE_NOMINAL);
+		regmap_write(da7219->regmap, DA7219_SYSTEM_MODES_INPUT, 0x00);
+		regmap_write(da7219->regmap, DA7219_SYSTEM_MODES_OUTPUT, 0x01);
+
+		for (i = 0; i < DA7219_SYS_STAT_CHECK_RETRIES; ++i) {
+			regmap_read(da7219->regmap, DA7219_SYSTEM_STATUS,
+				    &system_status);
+			if (!system_status)
+				break;
+
+			msleep(DA7219_SYS_STAT_CHECK_DELAY);
+		}
+	}
+
+	/* Soft reset codec */
 	regmap_write_bits(da7219->regmap, DA7219_ACCDET_CONFIG_1,
 			  DA7219_ACCDET_EN_MASK, 0);
 	regmap_write_bits(da7219->regmap, DA7219_CIF_CTRL,
-			  DA7219_CIF_REG_SOFT_RESET_MASK, 0);
+			  DA7219_CIF_REG_SOFT_RESET_MASK,
+			  DA7219_CIF_REG_SOFT_RESET_MASK);
 	regmap_write_bits(da7219->regmap, DA7219_SYSTEM_ACTIVE,
 			  DA7219_SYSTEM_ACTIVE_MASK, 0);
 
+	regcache_cache_bypass(da7219->regmap, false);
+
 	ret = snd_soc_register_codec(&i2c->dev, &soc_codec_dev_da7219,
 				     &da7219_dai, 1);
 	if (ret < 0) {
diff --git a/sound/soc/codecs/da7219.h b/sound/soc/codecs/da7219.h
index 545576ddf50c..f1b3ad835270 100644
--- a/sound/soc/codecs/da7219.h
+++ b/sound/soc/codecs/da7219.h
@@ -578,6 +578,7 @@
 #define DA7219_GAIN_RAMP_RATE_SHIFT	0
 #define DA7219_GAIN_RAMP_RATE_MASK	(0x3 << 0)
 #define DA7219_GAIN_RAMP_RATE_X8	(0x0 << 0)
+#define DA7219_GAIN_RAMP_RATE_NOMINAL	(0x1 << 0)
 #define DA7219_GAIN_RAMP_RATE_MAX	4
 
 /* DA7219_PC_COUNT = 0x94 */
@@ -772,6 +773,10 @@
 /* SRM */
 #define DA7219_SRM_CHECK_RETRIES	8
 
+/* System Controller */
+#define DA7219_SYS_STAT_CHECK_RETRIES	6
+#define DA7219_SYS_STAT_CHECK_DELAY	50
+
 enum da7219_clk_src {
 	DA7219_CLKSRC_MCLK = 0,
 	DA7219_CLKSRC_MCLK_SQR,
-- 
2.9.3