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Message-ID: <1564532424-10449-10-git-send-email-skomatineni@nvidia.com>
Date: Tue, 30 Jul 2019 17:20:13 -0700
From: Sowjanya Komatineni <skomatineni@...dia.com>
To: <thierry.reding@...il.com>, <jonathanh@...dia.com>,
<tglx@...utronix.de>, <jason@...edaemon.net>,
<marc.zyngier@....com>, <linus.walleij@...aro.org>,
<stefan@...er.ch>, <mark.rutland@....com>
CC: <pdeschrijver@...dia.com>, <pgaikwad@...dia.com>,
<sboyd@...nel.org>, <linux-clk@...r.kernel.org>,
<linux-gpio@...r.kernel.org>, <jckuo@...dia.com>,
<josephl@...dia.com>, <talho@...dia.com>, <skomatineni@...dia.com>,
<linux-tegra@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<mperttunen@...dia.com>, <spatra@...dia.com>, <robh+dt@...nel.org>,
<digetx@...il.com>, <devicetree@...r.kernel.org>
Subject: [PATCH v7 09/20] clk: tegra: clk-super: Add save and restore support
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@...dia.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
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