memory: tegra: Add system sleep support

Add system suspend/resume support for the memory controller found on
Tegra186 and later. This is required so that the SID registers can be
reprogrammed after their content was lost during system sleep.

Signed-off-by: Thierry Reding <treding@nvidia.com>

diff --git a/drivers/memory/tegra/tegra186.c b/drivers/memory/tegra/tegra186.c
index 57895116c8e5739700a218f36eee1dfc39b735dd..77a313f1bf0e4ef56a7e471add921c805860815e 100644 (file)
--- a/drivers/memory/tegra/tegra186.c
+++ b/drivers/memory/tegra/tegra186.c
@@ -602,10 +602,29 @@ static const struct of_device_id tegra186_mc_of_match[] = {
 };
 MODULE_DEVICE_TABLE(of, tegra186_mc_of_match);
 
+static int tegra186_mc_suspend(struct device *dev)
+{
+       return 0;
+}
+
+static int tegra186_mc_resume(struct device *dev)
+{
+       struct tegra186_mc *mc = dev_get_drvdata(dev);
+
+       tegra186_mc_program_sid(mc);
+
+       return 0;
+}
+
+static const struct dev_pm_ops tegra186_mc_pm_ops = {
+       SET_SYSTEM_SLEEP_PM_OPS(tegra186_mc_suspend, tegra186_mc_resume)
+};
+
 static struct platform_driver tegra186_mc_driver = {
        .driver = {
                .name = "tegra186-mc",
                .of_match_table = tegra186_mc_of_match,
+               .pm = &tegra186_mc_pm_ops,
                .suppress_bind_attrs = true,
        },
        .prevent_deferred_probe = true,