From: Thierry Reding <treding@nvidia.com>
Date: Sun, 22 Dec 2019 14:10:29 +0000 (+0100)
Subject: memory: tegra: Add system sleep support
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=177602b006414b02152d3ef670746beb2bfde9cd;p=linux.git

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 57895116c8e57..77a313f1bf0e4 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,