From: Claudiu Beznea <claudiu.bez...@microchip.com>
Add support to check if platform is off in suspend. The check is based on
pm_data.mode and CPU's regulator which will be turn off in suspend.
Signed-off-by: Claudiu Beznea <claudiu.bez...@microchip.com>
---
arch/arm/mach-at91/pm.c | 61 +++++++++++++++++++++++++++++++++++++++++++++----
1 file changed, 57 insertions(+), 4 deletions(-)
diff --git a/arch/arm/mach-at91/pm.c b/arch/arm/mach-at91/pm.c
index 51e808adb00c..be9bd482772b 100644
--- a/arch/arm/mach-at91/pm.c
+++ b/arch/arm/mach-at91/pm.c
@@ -16,6 +16,7 @@
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/parser.h>
+#include <linux/regulator/consumer.h>
#include <linux/suspend.h>
#include <linux/clk/at91_pmc.h>
@@ -164,6 +165,47 @@ static int at91_pm_config_ws(unsigned int pm_mode, bool
set)
return mode ? 0 : -EPERM;
}
+static const struct of_device_id sama5d2_cpu_reg_ids[] = {
+ { .compatible = "active-semi,act8945a", .data = "VDD_1V2" },
+ { /* sentinel */ }
+};
+
+static struct regulator *at91_pm_cpu_regulator_get(void)
+{
+ struct device *cpu_dev = get_cpu_device(0);
+ static struct regulator *cpu_reg;
+ const struct of_device_id *match;
+ struct platform_device *pdev;
+ struct device_node *np;
+
+ if (!cpu_dev)
+ return cpu_reg;
+
+ if (!cpu_reg) {
+ for_each_matching_node_and_match(np, sama5d2_cpu_reg_ids,
+ &match) {
+ pdev = of_find_device_by_node(np);
+ if (!pdev)
+ continue;
+
+ cpu_reg = regulator_get(cpu_dev, match->data);
+ put_device(&pdev->dev);
+ break;
+ }
+ }
+
+ return cpu_reg;
+}
+
+static bool at91_pm_state_allowed(suspend_state_t state)
+{
+ struct regulator *reg;
+
+ reg = at91_pm_cpu_regulator_get();
+
+ return reg && regulator_is_disabled_in_suspend(reg, state);
+}
+
/*
* Called after processes are frozen, but before we shutdown devices.
*/
@@ -182,6 +224,9 @@ static int at91_pm_begin(suspend_state_t state)
pm_data.mode = -1;
}
+ if (pm_data.mode == AT91_PM_BACKUP && !at91_pm_state_allowed(state))
+ return -EPERM;
+
return at91_pm_config_ws(pm_data.mode, true);
}
@@ -321,12 +366,20 @@ static void at91_pm_end(void)
at91_pm_config_ws(pm_data.mode, false);
}
+static bool at91_pm_off_in_suspend(suspend_state_t state)
+{
+ if (pm_data.mode != AT91_PM_BACKUP)
+ return false;
+
+ return at91_pm_state_allowed(state);
+}
static const struct platform_suspend_ops at91_pm_ops = {
- .valid = at91_pm_valid_state,
- .begin = at91_pm_begin,
- .enter = at91_pm_enter,
- .end = at91_pm_end,
+ .valid = at91_pm_valid_state,
+ .begin = at91_pm_begin,
+ .enter = at91_pm_enter,
+ .end = at91_pm_end,
+ .off_in_suspend = at91_pm_off_in_suspend,
};
static struct platform_device at91_cpuidle_device = {
--
2.7.4
