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@sholland.org>
Acked-by: Chen-Yu Tsai <wens@csie.org>
Link: https://lore.kernel.org/r/20200726025334.59931-3-samuel@sholland.orgSigned-off-by: Mark Brown <broonie@kernel.org>

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[] = {