linux-kernel - [PATCH v1 3/4] soc/tegra: fuse: Enable fuse clock on suspend for Tegra124

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Date:   Tue,  3 Aug 2021 01:13:35 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Peter De Schrijver <pdeschrijver@...dia.com>,
        Prashant Gaikwad <pgaikwad@...dia.com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>
Cc:     linux-tegra@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v1 3/4] soc/tegra: fuse: Enable fuse clock on suspend for Tegra124

The FUSE clock should be enabled during suspend on Tegra124. Currently
clk driver enables it on all SoCs, but FUSE may require a higher core
voltage on Tegra30 while enabled. Move the quirk into the FUSE driver
and make it specific to Tegra124.

Signed-off-by: Dmitry Osipenko <digetx@...il.com>
---
 drivers/soc/tegra/fuse/fuse-tegra.c   | 29 +++++++++++++++++++++++++++
 drivers/soc/tegra/fuse/fuse-tegra20.c |  1 +
 drivers/soc/tegra/fuse/fuse-tegra30.c |  7 +++++++
 drivers/soc/tegra/fuse/fuse.h         |  2 ++
 4 files changed, 39 insertions(+)

diff --git a/drivers/soc/tegra/fuse/fuse-tegra.c b/drivers/soc/tegra/fuse/fuse-tegra.c
index 747237865aff..f2151815db58 100644
--- a/drivers/soc/tegra/fuse/fuse-tegra.c
+++ b/drivers/soc/tegra/fuse/fuse-tegra.c
@@ -275,9 +275,38 @@ static int __maybe_unused tegra_fuse_runtime_suspend(struct device *dev)
 	return 0;
 }
 
+static int __maybe_unused tegra_fuse_suspend(struct device *dev)
+{
+	int ret;
+
+	/*
+	 * Critical for RAM re-repair operation, which must occur on resume
+	 * from LP1 system suspend and as part of CCPLEX cluster switching.
+	 */
+	if (fuse->soc->clk_suspend_on)
+		ret = pm_runtime_resume_and_get(dev);
+	else
+		ret = pm_runtime_force_suspend(dev);
+
+	return ret;
+}
+
+static int __maybe_unused tegra_fuse_resume(struct device *dev)
+{
+	int ret = 0;
+
+	if (fuse->soc->clk_suspend_on)
+		pm_runtime_put(dev);
+	else
+		ret = pm_runtime_force_resume(dev);
+
+	return ret;
+}
+
 static const struct dev_pm_ops tegra_fuse_pm = {
 	SET_RUNTIME_PM_OPS(tegra_fuse_runtime_suspend, tegra_fuse_runtime_resume,
 			   NULL)
+	SET_SYSTEM_SLEEP_PM_OPS(tegra_fuse_suspend, tegra_fuse_resume)
 };
 
 static struct platform_driver tegra_fuse_driver = {
diff --git a/drivers/soc/tegra/fuse/fuse-tegra20.c b/drivers/soc/tegra/fuse/fuse-tegra20.c
index cd6a273707fe..8ec9fc5e5e4b 100644
--- a/drivers/soc/tegra/fuse/fuse-tegra20.c
+++ b/drivers/soc/tegra/fuse/fuse-tegra20.c
@@ -167,4 +167,5 @@ const struct tegra_fuse_soc tegra20_fuse_soc = {
 	.probe = tegra20_fuse_probe,
 	.info = &tegra20_fuse_info,
 	.soc_attr_group = &tegra_soc_attr_group,
+	.clk_suspend_on = false,
 };
diff --git a/drivers/soc/tegra/fuse/fuse-tegra30.c b/drivers/soc/tegra/fuse/fuse-tegra30.c
index dd03565a39a4..b071d433d74f 100644
--- a/drivers/soc/tegra/fuse/fuse-tegra30.c
+++ b/drivers/soc/tegra/fuse/fuse-tegra30.c
@@ -112,6 +112,7 @@ const struct tegra_fuse_soc tegra30_fuse_soc = {
 	.speedo_init = tegra30_init_speedo_data,
 	.info = &tegra30_fuse_info,
 	.soc_attr_group = &tegra_soc_attr_group,
+	.clk_suspend_on = false,
 };
 #endif
 
@@ -127,6 +128,7 @@ const struct tegra_fuse_soc tegra114_fuse_soc = {
 	.speedo_init = tegra114_init_speedo_data,
 	.info = &tegra114_fuse_info,
 	.soc_attr_group = &tegra_soc_attr_group,
+	.clk_suspend_on = false,
 };
 #endif
 
@@ -208,6 +210,7 @@ const struct tegra_fuse_soc tegra124_fuse_soc = {
 	.lookups = tegra124_fuse_lookups,
 	.num_lookups = ARRAY_SIZE(tegra124_fuse_lookups),
 	.soc_attr_group = &tegra_soc_attr_group,
+	.clk_suspend_on = true,
 };
 #endif
 
@@ -294,6 +297,7 @@ const struct tegra_fuse_soc tegra210_fuse_soc = {
 	.lookups = tegra210_fuse_lookups,
 	.num_lookups = ARRAY_SIZE(tegra210_fuse_lookups),
 	.soc_attr_group = &tegra_soc_attr_group,
+	.clk_suspend_on = false,
 };
 #endif
 
@@ -324,6 +328,7 @@ const struct tegra_fuse_soc tegra186_fuse_soc = {
 	.lookups = tegra186_fuse_lookups,
 	.num_lookups = ARRAY_SIZE(tegra186_fuse_lookups),
 	.soc_attr_group = &tegra_soc_attr_group,
+	.clk_suspend_on = false,
 };
 #endif
 
@@ -354,6 +359,7 @@ const struct tegra_fuse_soc tegra194_fuse_soc = {
 	.lookups = tegra194_fuse_lookups,
 	.num_lookups = ARRAY_SIZE(tegra194_fuse_lookups),
 	.soc_attr_group = &tegra194_soc_attr_group,
+	.clk_suspend_on = false,
 };
 #endif
 
@@ -384,5 +390,6 @@ const struct tegra_fuse_soc tegra234_fuse_soc = {
 	.lookups = tegra234_fuse_lookups,
 	.num_lookups = ARRAY_SIZE(tegra234_fuse_lookups),
 	.soc_attr_group = &tegra194_soc_attr_group,
+	.clk_suspend_on = false,
 };
 #endif
diff --git a/drivers/soc/tegra/fuse/fuse.h b/drivers/soc/tegra/fuse/fuse.h
index e057a58e2060..de58feba0435 100644
--- a/drivers/soc/tegra/fuse/fuse.h
+++ b/drivers/soc/tegra/fuse/fuse.h
@@ -34,6 +34,8 @@ struct tegra_fuse_soc {
 	unsigned int num_lookups;
 
 	const struct attribute_group *soc_attr_group;
+
+	bool clk_suspend_on;
 };
 
 struct tegra_fuse {
-- 
2.32.0