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clk: tegra: periph: Add restore_context support

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This patch implements restore_context support for clk-periph and
clk-sdmmc-mux clock operations to restore clock parent and rates
on system resume.

During system suspend, core power goes off and looses the context
of the Tegra clock controller registers.

So on system resume, clocks parent and rate are restored back to
the context before suspend based on cached data.

Acked-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Sowjanya Komatineni <skomatineni@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Sowjanya Komatineni 2019-08-16 12:41:53 -07:00 committed by Thierry Reding
parent 50d4da9b10
commit 2b8cfd6b52
2 changed files with 37 additions and 0 deletions
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21
drivers/clk/tegra/clk-periph.c
View File

@ -3,6 +3,7 @@
* Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved.
*/
#include <linux/clk.h>
#include <linux/clk-provider.h>
#include <linux/export.h>
#include <linux/slab.h>
@ -99,6 +100,23 @@ static void clk_periph_disable(struct clk_hw *hw)
gate_ops->disable(gate_hw);
}
static void clk_periph_restore_context(struct clk_hw *hw)
{
struct tegra_clk_periph *periph = to_clk_periph(hw);
const struct clk_ops *div_ops = periph->div_ops;
struct clk_hw *div_hw = &periph->divider.hw;
int parent_id;
parent_id = clk_hw_get_parent_index(hw);
if (WARN_ON(parent_id < 0))
return;
if (!(periph->gate.flags & TEGRA_PERIPH_NO_DIV))
div_ops->restore_context(div_hw);
clk_periph_set_parent(hw, parent_id);
}
const struct clk_ops tegra_clk_periph_ops = {
.get_parent = clk_periph_get_parent,
.set_parent = clk_periph_set_parent,
@ -108,6 +126,7 @@ const struct clk_ops tegra_clk_periph_ops = {
.is_enabled = clk_periph_is_enabled,
.enable = clk_periph_enable,
.disable = clk_periph_disable,
.restore_context = clk_periph_restore_context,
};
static const struct clk_ops tegra_clk_periph_nodiv_ops = {
@ -116,6 +135,7 @@ static const struct clk_ops tegra_clk_periph_nodiv_ops = {
.is_enabled = clk_periph_is_enabled,
.enable = clk_periph_enable,
.disable = clk_periph_disable,
.restore_context = clk_periph_restore_context,
};
static const struct clk_ops tegra_clk_periph_no_gate_ops = {
@ -124,6 +144,7 @@ static const struct clk_ops tegra_clk_periph_no_gate_ops = {
.recalc_rate = clk_periph_recalc_rate,
.round_rate = clk_periph_round_rate,
.set_rate = clk_periph_set_rate,
.restore_context = clk_periph_restore_context,
};
static struct clk *_tegra_clk_register_periph(const char *name,

16
drivers/clk/tegra/clk-sdmmc-mux.c
View File

@ -194,6 +194,21 @@ static void clk_sdmmc_mux_disable(struct clk_hw *hw)
gate_ops->disable(gate_hw);
}
static void clk_sdmmc_mux_restore_context(struct clk_hw *hw)
{
struct clk_hw *parent = clk_hw_get_parent(hw);
unsigned long parent_rate = clk_hw_get_rate(parent);
unsigned long rate = clk_hw_get_rate(hw);
int parent_id;
parent_id = clk_hw_get_parent_index(hw);
if (WARN_ON(parent_id < 0))
return;
clk_sdmmc_mux_set_parent(hw, parent_id);
clk_sdmmc_mux_set_rate(hw, rate, parent_rate);
}
static const struct clk_ops tegra_clk_sdmmc_mux_ops = {
.get_parent = clk_sdmmc_mux_get_parent,
.set_parent = clk_sdmmc_mux_set_parent,
@ -203,6 +218,7 @@ static const struct clk_ops tegra_clk_sdmmc_mux_ops = {
.is_enabled = clk_sdmmc_mux_is_enabled,
.enable = clk_sdmmc_mux_enable,
.disable = clk_sdmmc_mux_disable,
.restore_context = clk_sdmmc_mux_restore_context,
};
struct clk *tegra_clk_register_sdmmc_mux_div(const char *name,