diff mbox series

[4/4] memory: tegra: Add system sleep support

Message ID 20191209143521.2357178-4-thierry.reding@gmail.com (mailing list archive)
State Mainlined
Commit 177602b006414b02152d3ef670746beb2bfde9cd
Headers show
Series [1/4] memory: tegra: Rename tegra_mc to tegra186_mc on Tegra186 | expand

Commit Message

Thierry Reding Dec. 9, 2019, 2:35 p.m. UTC 
From: Thierry Reding <treding@nvidia.com>

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>
---
 drivers/memory/tegra/tegra186.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)
diff mbox series

Patch

diff --git a/drivers/memory/tegra/tegra186.c b/drivers/memory/tegra/tegra186.c
index 57895116c8e5..77a313f1bf0e 100644
--- 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,