linux-kernel - [PATCH 2/8] ASoC: sun50i-codec-analog: Gate the amplifier clock during suspend

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Message-Id: <20200217021813.53266-3-samuel@sholland.org>
Date:   Sun, 16 Feb 2020 20:18:07 -0600
From:   Samuel Holland <samuel@...lland.org>
To:     Mark Brown <broonie@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Maxime Ripard <mripard@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>,
        Vasily Khoruzhick <anarsoul@...il.com>,
        Luca Weiss <luca@...tu.xyz>
Cc:     alsa-devel@...a-project.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Samuel Holland <samuel@...lland.org>
Subject: [PATCH 2/8] ASoC: sun50i-codec-analog: Gate the amplifier clock during suspend

The clock must be running for the zero-crossing mute functionality.
However, it must be gated for VDD-SYS to be turned off during system
suspend. Disable it in the suspend callback, after everything has
already been muted, to avoid pops when muting/unmuting outputs.

Signed-off-by: Samuel Holland <samuel@...lland.org>
---
 sound/soc/sunxi/sun50i-codec-analog.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/sound/soc/sunxi/sun50i-codec-analog.c b/sound/soc/sunxi/sun50i-codec-analog.c
index cbdb31c3b7bd..4ad262c2e59b 100644
--- a/sound/soc/sunxi/sun50i-codec-analog.c
+++ b/sound/soc/sunxi/sun50i-codec-analog.c
@@ -438,6 +438,19 @@ static const struct snd_soc_dapm_route sun50i_a64_codec_routes[] = {
 	{ "EARPIECE", NULL, "Earpiece Amp" },
 };
 
+static int sun50i_a64_codec_suspend(struct snd_soc_component *component)
+{
+	return regmap_update_bits(component->regmap, SUN50I_ADDA_HP_CTRL,
+				  BIT(SUN50I_ADDA_HP_CTRL_PA_CLK_GATE),
+				  BIT(SUN50I_ADDA_HP_CTRL_PA_CLK_GATE));
+}
+
+static int sun50i_a64_codec_resume(struct snd_soc_component *component)
+{
+	return regmap_update_bits(component->regmap, SUN50I_ADDA_HP_CTRL,
+				  BIT(SUN50I_ADDA_HP_CTRL_PA_CLK_GATE), 0);
+}
+
 static const struct snd_soc_component_driver sun50i_codec_analog_cmpnt_drv = {
 	.controls		= sun50i_a64_codec_controls,
 	.num_controls		= ARRAY_SIZE(sun50i_a64_codec_controls),
@@ -445,6 +458,8 @@ static const struct snd_soc_component_driver sun50i_codec_analog_cmpnt_drv = {
 	.num_dapm_widgets	= ARRAY_SIZE(sun50i_a64_codec_widgets),
 	.dapm_routes		= sun50i_a64_codec_routes,
 	.num_dapm_routes	= ARRAY_SIZE(sun50i_a64_codec_routes),
+	.suspend		= sun50i_a64_codec_suspend,
+	.resume			= sun50i_a64_codec_resume,
 };
 
 static const struct of_device_id sun50i_codec_analog_of_match[] = {
-- 
2.24.1