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Subject[PATCH] ASoC: rockchip: implement system suspend/resume for i2s
Date
restore hw registers after power loss during a suspend/resume cycle.

Signed-off-by: Sugar Zhang <sugar.zhang@rock-chips.com>
---

sound/soc/rockchip/rockchip_i2s.c | 26 ++++++++++++++++++++++++++
1 file changed, 26 insertions(+)

diff --git a/sound/soc/rockchip/rockchip_i2s.c b/sound/soc/rockchip/rockchip_i2s.c
index 574c6af..53970ac 100644
--- a/sound/soc/rockchip/rockchip_i2s.c
+++ b/sound/soc/rockchip/rockchip_i2s.c
@@ -614,9 +614,35 @@ static const struct of_device_id rockchip_i2s_match[] = {
{},
};

+#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 = {
--
1.9.1

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