Merge tag 'asoc-v4.16-5' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound

Pull more ASoC updates from Mark Brown:
 "With the merge window having been delayed for another week here's
  another batch of updates that came in during that week.

  There's a few important fixes in here, mainly a fix for I/O on a
  number of devices caused by some of the component rework and a fix for
  a potential issue if more than one component in a link provides
  compressed operations. The I/O fixes are particularly important as the
  problem causes a power regression on a number of OMAP platforms"

* tag 'asoc-v4.16-5' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound: (22 commits)
  ASoC: stm32: add of dependency for stm32 drivers
  ASoC: mt8173-rt5650: fix child-node lookup
  ASoC: dapm: fix debugfs read using path->connected
  ASoC: compress: Fixup error messages
  ASoC: compress: Remove some extraneous blank lines
  ASoC: compress: Correct handling of copy callback
  ASoC: Intel: kbl: Enable mclk and ssp sclk early
  ASoC: Intel: Skylake: Add extended I2S config blob support in Clock driver
  ASoC: Intel: Skylake: Add ssp clock driver
  ASoC: Fix twl4030 and 6040 regression by adding back read and write
  ASoC: sun8i-codec: Add ADC support for a33
  ASoC: rockchip: Use dummy_dai for rt5514 dsp dailink
  ASoC: soc-pcm: rename .pmdown_time to .use_pmdown_time for Component
  ASoC: ak4613: call dummy write for PW_MGMT1/3 when Playback
  ASoC: soc-pcm: don't call flush_delayed_work() many times in soc_pcm_private_free()
  ASoC: soc-core: snd_soc_rtdcom_lookup() cares component driver name
  ASoC: sam9x5_wm8731: Drop 'ASoC' prefix from error messages
  ASoC: sam9g20_wm8731: use dev_*() logging functions
  ASoC: max98373 Changed SPDX header in C++ comments style
  ASoC: dmic: Fix check of return value from read of 'num-channels'
  ...

7 files changed, 89 insertions, 6 deletions

diff --git a/sound/soc/codecs/ak4613.c b/sound/soc/codecs/ak4613.c
index b95bb8b52e51..3d1cf4784e87 100644
--- a/sound/soc/codecs/ak4613.c
+++ b/sound/soc/codecs/ak4613.c
@@ -15,6 +15,7 @@
  */
 
 #include <linux/clk.h>
+#include <linux/delay.h>
 #include <linux/i2c.h>
 #include <linux/slab.h>
 #include <linux/of_device.h>
@@ -95,6 +96,9 @@ struct ak4613_priv {
 	struct mutex lock;
 	const struct ak4613_interface *iface;
 	struct snd_pcm_hw_constraint_list constraint;
+	struct work_struct dummy_write_work;
+	struct snd_soc_component *component;
+	unsigned int rate;
 	unsigned int sysclk;
 
 	unsigned int fmt;
@@ -392,6 +396,7 @@ static int ak4613_dai_hw_params(struct snd_pcm_substream *substream,
 	default:
 		return -EINVAL;
 	}
+	priv->rate = rate;
 
 	/*
 	 * FIXME
@@ -467,11 +472,83 @@ static int ak4613_set_bias_level(struct snd_soc_codec *codec,
 	return 0;
 }
 
+static void ak4613_dummy_write(struct work_struct *work)
+{
+	struct ak4613_priv *priv = container_of(work,
+						struct ak4613_priv,
+						dummy_write_work);
+	struct snd_soc_component *component = priv->component;
+	unsigned int mgmt1;
+	unsigned int mgmt3;
+
+	/*
+	 * PW_MGMT1 / PW_MGMT3 needs dummy write at least after 5 LR clocks
+	 *
+	 * Note
+	 *
+	 * To avoid extra delay, we want to avoid preemption here,
+	 * but we can't. Because it uses I2C access which is using IRQ
+	 * and sleep. Thus, delay might be more than 5 LR clocks
+	 * see also
+	 *	ak4613_dai_trigger()
+	 */
+	udelay(5000000 / priv->rate);
+
+	snd_soc_component_read(component, PW_MGMT1, &mgmt1);
+	snd_soc_component_read(component, PW_MGMT3, &mgmt3);
+
+	snd_soc_component_write(component, PW_MGMT1, mgmt1);
+	snd_soc_component_write(component, PW_MGMT3, mgmt3);
+}
+
+static int ak4613_dai_trigger(struct snd_pcm_substream *substream, int cmd,
+			      struct snd_soc_dai *dai)
+{
+	struct snd_soc_codec *codec = dai->codec;
+	struct ak4613_priv *priv = snd_soc_codec_get_drvdata(codec);
+
+	/*
+	 * FIXME
+	 *
+	 * PW_MGMT1 / PW_MGMT3 needs dummy write at least after 5 LR clocks
+	 * from Power Down Release. Otherwise, Playback volume will be 0dB.
+	 * To avoid complex multiple delay/dummy_write method from
+	 * ak4613_set_bias_level() / SND_SOC_DAPM_DAC_E("DACx", ...),
+	 * call it once here.
+	 *
+	 * But, unfortunately, we can't "write" here because here is atomic
+	 * context (It uses I2C access for writing).
+	 * Thus, use schedule_work() to switching to normal context
+	 * immediately.
+	 *
+	 * Note
+	 *
+	 * Calling ak4613_dummy_write() function might be delayed.
+	 * In such case, ak4613 volume might be temporarily 0dB when
+	 * beggining of playback.
+	 * see also
+	 *	ak4613_dummy_write()
+	 */
+
+	if ((cmd != SNDRV_PCM_TRIGGER_START) &&
+	    (cmd != SNDRV_PCM_TRIGGER_RESUME))
+		return 0;
+
+	if (substream->stream != SNDRV_PCM_STREAM_PLAYBACK)
+		return  0;
+
+	priv->component = &codec->component;
+	schedule_work(&priv->dummy_write_work);
+
+	return 0;
+}
+
 static const struct snd_soc_dai_ops ak4613_dai_ops = {
 	.startup	= ak4613_dai_startup,
 	.shutdown	= ak4613_dai_shutdown,
 	.set_sysclk	= ak4613_dai_set_sysclk,
 	.set_fmt	= ak4613_dai_set_fmt,
+	.trigger	= ak4613_dai_trigger,
 	.hw_params	= ak4613_dai_hw_params,
 };
 
@@ -590,6 +667,7 @@ static int ak4613_i2c_probe(struct i2c_client *i2c,
 	priv->iface		= NULL;
 	priv->cnt		= 0;
 	priv->sysclk		= 0;
+	INIT_WORK(&priv->dummy_write_work, ak4613_dummy_write);
 
 	mutex_init(&priv->lock);
 
diff --git a/sound/soc/codecs/dmic.c b/sound/soc/codecs/dmic.c
index c88f974ebe3e..cf83c423394d 100644
--- a/sound/soc/codecs/dmic.c
+++ b/sound/soc/codecs/dmic.c
@@ -113,7 +113,7 @@ static int dmic_dev_probe(struct platform_device *pdev)
 
 	if (pdev->dev.of_node) {
 		err = of_property_read_u32(pdev->dev.of_node, "num-channels", &chans);
-		if (err && (err != -ENOENT))
+		if (err && (err != -EINVAL))
 			return err;
 
 		if (!err) {
diff --git a/sound/soc/codecs/max98373.c b/sound/soc/codecs/max98373.c
index 31b0864583e8..562e88765129 100644
--- a/sound/soc/codecs/max98373.c
+++ b/sound/soc/codecs/max98373.c
@@ -1,5 +1,5 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-/* Copyright (c) 2017, Maxim Integrated */
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (c) 2017, Maxim Integrated
 
 #include <linux/acpi.h>
 #include <linux/i2c.h>
diff --git a/sound/soc/codecs/max98373.h b/sound/soc/codecs/max98373.h
index d0b359d0cf8c..f6a37aa02f26 100644
--- a/sound/soc/codecs/max98373.h
+++ b/sound/soc/codecs/max98373.h
@@ -1,5 +1,6 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-/* Copyright (c) 2017, Maxim Integrated */
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (c) 2017, Maxim Integrated
+
 #ifndef _MAX98373_H
 #define _MAX98373_H
 
diff --git a/sound/soc/codecs/sgtl5000.c b/sound/soc/codecs/sgtl5000.c
index 633cdcfc933d..e1ab5537d27a 100644
--- a/sound/soc/codecs/sgtl5000.c
+++ b/sound/soc/codecs/sgtl5000.c
@@ -1392,7 +1392,7 @@ static int sgtl5000_i2c_probe(struct i2c_client *client,
 
 		ana_pwr |= SGTL5000_LINEREG_D_POWERUP;
 		dev_info(&client->dev,
-			 "Using internal LDO instead of VDDD: check ER1\n");
+			 "Using internal LDO instead of VDDD: check ER1 erratum\n");
 	} else {
 		/* using external LDO for VDDD
 		 * Clear startup powerup and simple powerup
diff --git a/sound/soc/codecs/twl4030.c b/sound/soc/codecs/twl4030.c
index 8798182959c1..e4d7f397d361 100644
--- a/sound/soc/codecs/twl4030.c
+++ b/sound/soc/codecs/twl4030.c
@@ -2195,6 +2195,8 @@ static int twl4030_soc_remove(struct snd_soc_codec *codec)
 static const struct snd_soc_codec_driver soc_codec_dev_twl4030 = {
 	.probe = twl4030_soc_probe,
 	.remove = twl4030_soc_remove,
+	.read = twl4030_read,
+	.write = twl4030_write,
 	.set_bias_level = twl4030_set_bias_level,
 	.idle_bias_off = true,
 
diff --git a/sound/soc/codecs/twl6040.c b/sound/soc/codecs/twl6040.c
index 3b895b4b451c..573a523ed0b3 100644
--- a/sound/soc/codecs/twl6040.c
+++ b/sound/soc/codecs/twl6040.c
@@ -1158,6 +1158,8 @@ static int twl6040_remove(struct snd_soc_codec *codec)
 static const struct snd_soc_codec_driver soc_codec_dev_twl6040 = {
 	.probe = twl6040_probe,
 	.remove = twl6040_remove,
+	.read = twl6040_read,
+	.write = twl6040_write,
 	.set_bias_level = twl6040_set_bias_level,
 	.suspend_bias_off = true,
 	.ignore_pmdown_time = true,