From: Sugar Zhang <sugar.zhang@rock-chips.com>
Date: Tue, 5 Jul 2016 02:45:11 +0000 (+0800)
Subject: FROMLIST: ASoC: rockchip: implement system suspend/resume for i2s
X-Git-Tag: firefly_0821_release~2219
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=62b5ed622d843f8870c6a0779a9088e9b905cdfd;p=firefly-linux-kernel-4.4.55.git

FROMLIST: ASoC: rockchip: implement system suspend/resume for i2s

restore hw registers after power loss during a suspend/resume cycle.

Change-Id: I109c4acaef8fef12f84e4c1b6d3488891a94ebb2
Signed-off-by: Sugar Zhang <sugar.zhang@rock-chips.com>
(am from https://patchwork.kernel.org/patch/9213485/)
---

diff --git a/sound/soc/rockchip/rockchip_i2s.c b/sound/soc/rockchip/rockchip_i2s.c
index 652e8c5ea166..2408872b037f 100644
--- a/sound/soc/rockchip/rockchip_i2s.c
+++ b/sound/soc/rockchip/rockchip_i2s.c
@@ -663,9 +663,35 @@ static int rockchip_i2s_remove(struct platform_device *pdev)
 	return 0;
 }
 
+#ifdef CONFIG_PM_SLEEP
+static int rockchip_i2s_suspend(struct device *dev)
+{
+	struct rk_i2s_dev *i2s = dev_get_drvdata(dev);
+
+	regcache_mark_dirty(i2s->regmap);
+
+	return 0;
+}
+
+static int rockchip_i2s_resume(struct device *dev)
+{
+	struct rk_i2s_dev *i2s = dev_get_drvdata(dev);
+	int ret;
+
+	ret = pm_runtime_get_sync(dev);
+	if (ret < 0)
+		return ret;
+	ret = regcache_sync(i2s->regmap);
+	pm_runtime_put(dev);
+
+	return ret;
+}
+#endif
+
 static const struct dev_pm_ops rockchip_i2s_pm_ops = {
 	SET_RUNTIME_PM_OPS(i2s_runtime_suspend, i2s_runtime_resume,
 			   NULL)
+	SET_SYSTEM_SLEEP_PM_OPS(rockchip_i2s_suspend, rockchip_i2s_resume)
 };
 
 static struct platform_driver rockchip_i2s_driver = {