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clk: renesas: cpg-mssr: Add support to restore core clocks during resume

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On R-Car Gen3 systems, PSCI system suspend powers down the SoC, possibly
losing clock configuration.  Hence add a notifier chain that can be used
by core clocks to save/restore clock state during system suspend/resume.

The implementation of the actual clock state save/restore operations is
clock-specific, and to be registered with the notifier chain in the SoC
or family-specific cpg_mssr_info.cpg_clk_register() callback.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Tested-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
This commit is contained in:
Geert Uytterhoeven 2017-06-21 22:24:15 +02:00
parent 560869100b
commit 1f4023cdd1
6 changed files with 23 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
drivers/clk/renesas/rcar-gen2-cpg.c
View File

@ -262,10 +262,9 @@ static unsigned int cpg_pll0_div __initdata;
static u32 cpg_mode __initdata;
struct clk * __init rcar_gen2_cpg_clk_register(struct device *dev,
const struct cpg_core_clk *core,
const struct cpg_mssr_info *info,
struct clk **clks,
void __iomem *base)
const struct cpg_core_clk *core, const struct cpg_mssr_info *info,
struct clk **clks, void __iomem *base,
struct raw_notifier_head *notifiers)
{
const struct clk_div_table *table = NULL;
const struct clk *parent;

6
drivers/clk/renesas/rcar-gen2-cpg.h
View File

@ -34,9 +34,9 @@ struct rcar_gen2_cpg_pll_config {
};
struct clk *rcar_gen2_cpg_clk_register(struct device *dev,
const struct cpg_core_clk *core,
const struct cpg_mssr_info *info,
struct clk **clks, void __iomem *base);
const struct cpg_core_clk *core, const struct cpg_mssr_info *info,
struct clk **clks, void __iomem *base,
struct raw_notifier_head *notifiers);
int rcar_gen2_cpg_init(const struct rcar_gen2_cpg_pll_config *config,
unsigned int pll0_div, u32 mode);

3
drivers/clk/renesas/rcar-gen3-cpg.c
View File

@ -265,7 +265,8 @@ static const struct soc_device_attribute cpg_quirks_match[] __initconst = {
struct clk * __init rcar_gen3_cpg_clk_register(struct device *dev,
const struct cpg_core_clk *core, const struct cpg_mssr_info *info,
struct clk **clks, void __iomem *base)
struct clk **clks, void __iomem *base,
struct raw_notifier_head *notifiers)
{
const struct clk *parent;
unsigned int mult = 1;

3
drivers/clk/renesas/rcar-gen3-cpg.h
View File

@ -44,7 +44,8 @@ struct rcar_gen3_cpg_pll_config {
struct clk *rcar_gen3_cpg_clk_register(struct device *dev,
const struct cpg_core_clk *core, const struct cpg_mssr_info *info,
struct clk **clks, void __iomem *base);
struct clk **clks, void __iomem *base,
struct raw_notifier_head *notifiers);
int rcar_gen3_cpg_init(const struct rcar_gen3_cpg_pll_config *config,
unsigned int clk_extalr, u32 mode);

12
drivers/clk/renesas/renesas-cpg-mssr.c
View File

@ -107,6 +107,7 @@ static const u16 srcr[] = {
* @num_core_clks: Number of Core Clocks in clks[]
* @num_mod_clks: Number of Module Clocks in clks[]
* @last_dt_core_clk: ID of the last Core Clock exported to DT
* @notifiers: Notifier chain to save/restore clock state for system resume
* @smstpcr_saved[].mask: Mask of SMSTPCR[] bits under our control
* @smstpcr_saved[].val: Saved values of SMSTPCR[]
*/
@ -123,6 +124,7 @@ struct cpg_mssr_priv {
unsigned int num_mod_clks;
unsigned int last_dt_core_clk;
struct raw_notifier_head notifiers;
struct {
u32 mask;
u32 val;
@ -312,7 +314,8 @@ static void __init cpg_mssr_register_core_clk(const struct cpg_core_clk *core,
default:
if (info->cpg_clk_register)
clk = info->cpg_clk_register(dev, core, info,
priv->clks, priv->base);
priv->clks, priv->base,
&priv->notifiers);
else
dev_err(dev, "%s has unsupported core clock type %u\n",
core->name, core->type);
@ -726,6 +729,9 @@ static int cpg_mssr_suspend_noirq(struct device *dev)
readl(priv->base + SMSTPCR(reg));
}
/* Save core clocks */
raw_notifier_call_chain(&priv->notifiers, PM_EVENT_SUSPEND, NULL);
return 0;
}
@ -739,6 +745,9 @@ static int cpg_mssr_resume_noirq(struct device *dev)
if (!psci_ops.cpu_suspend)
return 0;
/* Restore core clocks */
raw_notifier_call_chain(&priv->notifiers, PM_EVENT_RESUME, NULL);
/* Restore module clocks */
for (reg = 0; reg < ARRAY_SIZE(priv->smstpcr_saved); reg++) {
mask = priv->smstpcr_saved[reg].mask;
@ -822,6 +831,7 @@ static int __init cpg_mssr_probe(struct platform_device *pdev)
priv->num_core_clks = info->num_total_core_clks;
priv->num_mod_clks = info->num_hw_mod_clks;
priv->last_dt_core_clk = info->last_dt_core_clk;
RAW_INIT_NOTIFIER_HEAD(&priv->notifiers);
for (i = 0; i < nclks; i++)
clks[i] = ERR_PTR(-ENOENT);

3
drivers/clk/renesas/renesas-cpg-mssr.h
View File

@ -127,7 +127,8 @@ struct cpg_mssr_info {
struct clk *(*cpg_clk_register)(struct device *dev,
const struct cpg_core_clk *core,
const struct cpg_mssr_info *info,
struct clk **clks, void __iomem *base);
struct clk **clks, void __iomem *base,
struct raw_notifier_head *notifiers);
};
extern const struct cpg_mssr_info r8a7743_cpg_mssr_info;