ASoC: tegra: implement suspend/resume for Tegra30 I2S
Add tegra30_i2s_{suspend,resume}. These use regcache functions to
restore all HW registers after power loss during a suspend/resume cycle.
Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
diff --git a/sound/soc/tegra/tegra30_i2s.c b/sound/soc/tegra/tegra30_i2s.c
index 31d092d..bd0ebc0 100644
--- a/sound/soc/tegra/tegra30_i2s.c
+++ b/sound/soc/tegra/tegra30_i2s.c
@@ -514,6 +514,24 @@
return 0;
}
+#ifdef CONFIG_PM_SLEEP
+static int tegra30_i2s_suspend(struct device *dev)
+{
+ struct tegra30_i2s *i2s = dev_get_drvdata(dev);
+
+ regcache_mark_dirty(i2s->regmap);
+
+ return 0;
+}
+
+static int tegra30_i2s_resume(struct device *dev)
+{
+ struct tegra30_i2s *i2s = dev_get_drvdata(dev);
+
+ return regcache_sync(i2s->regmap);
+}
+#endif
+
static const struct of_device_id tegra30_i2s_of_match[] = {
{ .compatible = "nvidia,tegra30-i2s", },
{},
@@ -522,6 +540,7 @@
static const struct dev_pm_ops tegra30_i2s_pm_ops = {
SET_RUNTIME_PM_OPS(tegra30_i2s_runtime_suspend,
tegra30_i2s_runtime_resume, NULL)
+ SET_SYSTEM_SLEEP_PM_OPS(tegra30_i2s_suspend, tegra30_i2s_resume)
};
static struct platform_driver tegra30_i2s_driver = {