From: Stephen Warren swarren@nvidia.com

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 --- sound/soc/tegra/tegra30_i2s.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+)

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 @@ static int tegra30_i2s_platform_remove(struct platform_device *pdev) 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 of_device_id tegra30_i2s_of_match[] = { 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 = {