ASoC: rockchip: i2s: restore register during runtime_suspend/resume cycle

when step into runtime_suspend, i2s pd will be disabled and loss state.
so need to restore register when runtime_resume.

Signed-off-by: Sugar Zhang <sugar.zhang@rock-chips.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 9 insertions, 1 deletions

diff --git a/sound/soc/rockchip/rockchip_i2s.c b/sound/soc/rockchip/rockchip_i2s.c
index 652e8c5ea166..974915cb4c4f 100644
--- a/sound/soc/rockchip/rockchip_i2s.c
+++ b/sound/soc/rockchip/rockchip_i2s.c
@@ -57,6 +57,7 @@ static int i2s_runtime_suspend(struct device *dev)
 {
         struct rk_i2s_dev *i2s = dev_get_drvdata(dev);
 
+        regcache_cache_only(i2s->regmap, true);
         clk_disable_unprepare(i2s->mclk);
 
         return 0;
@@ -73,7 +74,14 @@ static int i2s_runtime_resume(struct device *dev)
                 return ret;
         }
 
-        return 0;
+        regcache_cache_only(i2s->regmap, false);
+        regcache_mark_dirty(i2s->regmap);
+
+        ret = regcache_sync(i2s->regmap);
+        if (ret)
+                clk_disable_unprepare(i2s->mclk);
+
+        return ret;
 }
 
 static inline struct rk_i2s_dev *to_info(struct snd_soc_dai *dai)