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2023-12-08 01573e231f18eb2d99162747186f59511f56b64d

 kernel/sound/soc/codecs/dmic.c
..
..
@@ -1,22 +1,8 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * dmic.c  --  SoC audio for Generic Digital MICs
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  *
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  * Author: Liam Girdwood <lrg@slimlogic.co.uk>
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- *
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- * This program is free software; you can redistribute it and/or
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- * modify it under the terms of the GNU General Public License
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- * version 2 as published by the Free Software Foundation.
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- *
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- * This program is distributed in the hope that it will be useful, but
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- * WITHOUT ANY WARRANTY; without even the implied warranty of
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- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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- * General Public License for more details.
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- *
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- * You should have received a copy of the GNU General Public License
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- * along with this program; if not, write to the Free Software
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- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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- * 02110-1301 USA
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- *
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  */
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7
 
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 #include <linux/delay.h>
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@@ -30,9 +16,39 @@
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 #include <sound/soc.h>
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 #include <sound/soc-dapm.h>
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18
 
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+#define MAX_MODESWITCH_DELAY 70
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+static int modeswitch_delay;
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+module_param(modeswitch_delay, uint, 0644);
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+
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+static int wakeup_delay;
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+module_param(wakeup_delay, uint, 0644);
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+
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 struct dmic {
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 	struct gpio_desc *gpio_en;
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 	int wakeup_delay;
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+	/* Delay after DMIC mode switch */
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+	int modeswitch_delay;
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+};
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+
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+static int dmic_daiops_trigger(struct snd_pcm_substream *substream,
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+			       int cmd, struct snd_soc_dai *dai)
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+{
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+	struct snd_soc_component *component = dai->component;
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+	struct dmic *dmic = snd_soc_component_get_drvdata(component);
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+
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+	switch (cmd) {
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+	case SNDRV_PCM_TRIGGER_STOP:
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+		if (dmic->modeswitch_delay)
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+			mdelay(dmic->modeswitch_delay);
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+
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+		break;
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+	}
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+
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+	return 0;
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+}
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+
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+static const struct snd_soc_dai_ops dmic_dai_ops = {
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+	.trigger	= dmic_daiops_trigger,
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 };
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53
 
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 static int dmic_aif_event(struct snd_soc_dapm_widget *w,
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@@ -43,14 +59,14 @@
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 	switch (event) {
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 	case SND_SOC_DAPM_POST_PMU:
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 		if (dmic->gpio_en)
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-			gpiod_set_value(dmic->gpio_en, 1);
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+			gpiod_set_value_cansleep(dmic->gpio_en, 1);
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 		if (dmic->wakeup_delay)
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 			msleep(dmic->wakeup_delay);
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 		break;
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 	case SND_SOC_DAPM_POST_PMD:
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 		if (dmic->gpio_en)
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-			gpiod_set_value(dmic->gpio_en, 0);
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+			gpiod_set_value_cansleep(dmic->gpio_en, 0);
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 		break;
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 	}
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..
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@@ -68,6 +84,7 @@
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 			| SNDRV_PCM_FMTBIT_S24_LE
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 			| SNDRV_PCM_FMTBIT_S16_LE,
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 	},
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+	.ops    = &dmic_dai_ops,
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 };
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 static int dmic_component_probe(struct snd_soc_component *component)
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@@ -85,6 +102,15 @@
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 	device_property_read_u32(component->dev, "wakeup-delay-ms",
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 				 &dmic->wakeup_delay);
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+	device_property_read_u32(component->dev, "modeswitch-delay-ms",
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+				 &dmic->modeswitch_delay);
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+	if (wakeup_delay)
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+		dmic->wakeup_delay  = wakeup_delay;
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+	if (modeswitch_delay)
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+		dmic->modeswitch_delay  = modeswitch_delay;
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+
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+	if (dmic->modeswitch_delay > MAX_MODESWITCH_DELAY)
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+		dmic->modeswitch_delay = MAX_MODESWITCH_DELAY;
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 	snd_soc_component_set_drvdata(component, dmic);
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@@ -148,6 +174,7 @@
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 	{.compatible = "dmic-codec"},
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 	{}
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 };
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+MODULE_DEVICE_TABLE(of, dmic_dev_match);
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 static struct platform_driver dmic_driver = {
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 	.driver = {