ASoC: tegra: implement suspend/resume for Tegra30 AHUB

Add tegra30_ahub_{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_ahub.c b/sound/soc/tegra/tegra30_ahub.c
index 23e592f453faa9786b282f7e86c365edaf6af2ea..0f4787c24e43e67bddcf9c3bbee8c4b551e5823c 100644 (file)
--- a/sound/soc/tegra/tegra30_ahub.c
+++ b/sound/soc/tegra/tegra30_ahub.c
@@ -627,9 +627,30 @@ static int tegra30_ahub_remove(struct platform_device *pdev)
        return 0;
 }
 
+#ifdef CONFIG_PM_SLEEP
+static int tegra30_ahub_suspend(struct device *dev)
+{
+       regcache_mark_dirty(ahub->regmap_ahub);
+       regcache_mark_dirty(ahub->regmap_apbif);
+
+       return 0;
+}
+
+static int tegra30_ahub_resume(struct device *dev)
+{
+       int ret;
+
+       ret = regcache_sync(ahub->regmap_ahub);
+       ret |= regcache_sync(ahub->regmap_apbif);
+
+       return ret;
+}
+#endif
+
 static const struct dev_pm_ops tegra30_ahub_pm_ops = {
        SET_RUNTIME_PM_OPS(tegra30_ahub_runtime_suspend,
                           tegra30_ahub_runtime_resume, NULL)
+       SET_SYSTEM_SLEEP_PM_OPS(tegra30_ahub_suspend, tegra30_ahub_resume)
 };
 
 static struct platform_driver tegra30_ahub_driver = {