linux-kernel - [PATCH 9/9] ASoC: sun8i-codec: Manage module clock via DAPM

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Date:   Sun, 30 Aug 2020 22:48:52 -0500
From:   Samuel Holland <samuel@...lland.org>
To:     Mark Brown <broonie@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Maxime Ripard <mripard@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>, Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>
Cc:     Ondrej Jirman <megous@...ous.com>, alsa-devel@...a-project.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Samuel Holland <samuel@...lland.org>
Subject: [PATCH 9/9] ASoC: sun8i-codec: Manage module clock via DAPM

By representing the module clock as a DAPM widget, we ensure that the
clock is only enabled when the module is actually in use, without
additional code in runtime PM hooks.

Signed-off-by: Samuel Holland <samuel@...lland.org>
---
 sound/soc/sunxi/sun8i-codec.c | 19 +++++--------------
 1 file changed, 5 insertions(+), 14 deletions(-)

diff --git a/sound/soc/sunxi/sun8i-codec.c b/sound/soc/sunxi/sun8i-codec.c
index 8a7f98910347..178f6fb31fd4 100644
--- a/sound/soc/sunxi/sun8i-codec.c
+++ b/sound/soc/sunxi/sun8i-codec.c
@@ -102,26 +102,15 @@ static int sun8i_codec_runtime_resume(struct device *dev)
 	struct sun8i_codec *scodec = dev_get_drvdata(dev);
 	int ret;
 
-	ret = clk_prepare_enable(scodec->clk_module);
-	if (ret) {
-		dev_err(dev, "Failed to enable the module clock\n");
-		return ret;
-	}
-
 	regcache_cache_only(scodec->regmap, false);
 
 	ret = regcache_sync(scodec->regmap);
 	if (ret) {
 		dev_err(dev, "Failed to sync regmap cache\n");
-		goto err_disable_clk;
+		return ret;
 	}
 
 	return 0;
-
-err_disable_clk:
-	clk_disable_unprepare(scodec->clk_module);
-
-	return ret;
 }
 
 static int sun8i_codec_runtime_suspend(struct device *dev)
@@ -131,8 +120,6 @@ static int sun8i_codec_runtime_suspend(struct device *dev)
 	regcache_cache_only(scodec->regmap, true);
 	regcache_mark_dirty(scodec->regmap);
 
-	clk_disable_unprepare(scodec->clk_module);
-
 	return 0;
 }
 
@@ -379,6 +366,8 @@ static const struct snd_kcontrol_new sun8i_input_mixer_controls[] = {
 };
 
 static const struct snd_soc_dapm_widget sun8i_codec_dapm_widgets[] = {
+	SND_SOC_DAPM_CLOCK_SUPPLY("mod"),
+
 	/* Digital parts of the DACs and ADC */
 	SND_SOC_DAPM_SUPPLY("DAC", SUN8I_DAC_DIG_CTRL, SUN8I_DAC_DIG_CTRL_ENDA,
 			    0, NULL, 0),
@@ -448,6 +437,8 @@ static const struct snd_soc_dapm_widget sun8i_codec_dapm_widgets[] = {
 
 static const struct snd_soc_dapm_route sun8i_codec_dapm_routes[] = {
 	/* Clock Routes */
+	{ "AIF1", NULL, "mod" },
+
 	{ "AIF1", NULL, "SYSCLK AIF1" },
 	{ "AIF1 PLL", NULL, "AIF1" },
 	{ "SYSCLK", NULL, "AIF1 PLL" },
-- 
2.26.2