[PATCH v7 09/20] clk: tegra: clk-super: Add save and restore support

From: Sowjanya Komatineni <skomatineni@nvidia.com>
To: thierry.reding@gmail.com, jonathanh@nvidia.com,
	tglx@linutronix.de, jason@lakedaemon.net, marc.zyngier@arm.com,
	linus.walleij@linaro.org, stefan@agner.ch, mark.rutland@arm.com
Cc: pdeschrijver@nvidia.com, pgaikwad@nvidia.com, sboyd@kernel.org,
	linux-clk@vger.kernel.org, linux-gpio@vger.kernel.org,
	jckuo@nvidia.com, josephl@nvidia.com, talho@nvidia.com,
	skomatineni@nvidia.com, linux-tegra@vger.kernel.org,
	linux-kernel@vger.kernel.org, mperttunen@nvidia.com,
	spatra@nvidia.com, robh+dt@kernel.org, digetx@gmail.com,
	devicetree@vger.kernel.org, rjw@rjwysocki.net,
	viresh.kumar@linaro.org, linux-pm@vger.kernel.org
Subject: [PATCH v7 09/20] clk: tegra: clk-super: Add save and restore support
Date: Wed, 31 Jul 2019 14:10:52 -0700	[thread overview]
Message-ID: <1564607463-28802-10-git-send-email-skomatineni@nvidia.com> (raw)
In-Reply-To: <1564607463-28802-1-git-send-email-skomatineni@nvidia.com>

This patch implements save and restore context for clk_super_mux
and clk_super.

During system supend, core power goes off the and context of Tegra
CAR registers is lost.

So during suspend entry, context of super clock registers are saved
through save_context clk_ops and are restored through restore_context
clk_ops to have them in same state as before suspend.

Signed-off-by: Sowjanya Komatineni <skomatineni@nvidia.com>
---
 drivers/clk/tegra/clk-super.c | 39 +++++++++++++++++++++++++++++++++++++++
 drivers/clk/tegra/clk.h       |  1 +
 2 files changed, 40 insertions(+)

diff --git a/drivers/clk/tegra/clk-super.c b/drivers/clk/tegra/clk-super.c
index e2a1e95a8db7..be0551cb5587 100644
--- a/drivers/clk/tegra/clk-super.c
+++ b/drivers/clk/tegra/clk-super.c
@@ -124,9 +124,27 @@ static int clk_super_set_parent(struct clk_hw *hw, u8 index)
 	return err;
 }
 
+static int clk_super_mux_save_context(struct clk_hw *hw)
+{
+	struct tegra_clk_super_mux *mux = to_clk_super_mux(hw);
+
+	mux->parent_index_ctx = clk_super_get_parent(hw);
+
+	return 0;
+}
+
+static void clk_super_mux_restore_context(struct clk_hw *hw)
+{
+	struct tegra_clk_super_mux *mux = to_clk_super_mux(hw);
+
+	clk_super_set_parent(hw, mux->parent_index_ctx);
+}
+
 static const struct clk_ops tegra_clk_super_mux_ops = {
 	.get_parent = clk_super_get_parent,
 	.set_parent = clk_super_set_parent,
+	.save_context = clk_super_mux_save_context,
+	.restore_context = clk_super_mux_restore_context,
 };
 
 static long clk_super_round_rate(struct clk_hw *hw, unsigned long rate,
@@ -162,12 +180,33 @@ static int clk_super_set_rate(struct clk_hw *hw, unsigned long rate,
 	return super->div_ops->set_rate(div_hw, rate, parent_rate);
 }
 
+static int clk_super_save_context(struct clk_hw *hw)
+{
+	struct tegra_clk_super_mux *super = to_clk_super_mux(hw);
+
+	super->parent_index_ctx = clk_super_get_parent(hw);
+
+	return 0;
+}
+
+static void clk_super_restore_context(struct clk_hw *hw)
+{
+	struct tegra_clk_super_mux *super = to_clk_super_mux(hw);
+	struct clk_hw *div_hw = &super->frac_div.hw;
+
+	clk_super_set_parent(hw, super->parent_index_ctx);
+
+	super->div_ops->restore_context(div_hw);
+}
+
 const struct clk_ops tegra_clk_super_ops = {
 	.get_parent = clk_super_get_parent,
 	.set_parent = clk_super_set_parent,
 	.set_rate = clk_super_set_rate,
 	.round_rate = clk_super_round_rate,
 	.recalc_rate = clk_super_recalc_rate,
+	.save_context = clk_super_save_context,
+	.restore_context = clk_super_restore_context,
 };
 
 struct clk *tegra_clk_register_super_mux(const char *name,
diff --git a/drivers/clk/tegra/clk.h b/drivers/clk/tegra/clk.h
index f8de447f505b..d397dda7c6d0 100644
--- a/drivers/clk/tegra/clk.h
+++ b/drivers/clk/tegra/clk.h
@@ -701,6 +701,7 @@ struct tegra_clk_super_mux {
 	u8		div2_index;
 	u8		pllx_index;
 	spinlock_t	*lock;
+	u8		parent_index_ctx;
 };
 
 #define to_clk_super_mux(_hw) container_of(_hw, struct tegra_clk_super_mux, hw)
-- 
2.7.4
