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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>
This commit is contained in:
Stephen Warren 2013-06-03 11:37:42 -06:00 committed by Mark Brown
parent 2f41a3f48a
commit 5c5b08286f
1 changed files with 19 additions and 0 deletions
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19
sound/soc/tegra/tegra30_i2s.c
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@ -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 = {