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 652e8c5ea1667185f6bb191a2cc8a3714cd74c1b..2408872b037f43dbf57779adae458be4eb1fc4f4 100644 (file)
--- 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 = {