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authorRafael J. Wysocki <rafael.j.wysocki@intel.com>2019-05-16 13:43:19 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2019-05-27 11:51:45 +0300
commitbb1869012d7b78d1474808cb4c8bd8b272645876 (patch)
tree1df9a6c5b0a5511970caff3c491de0beac10e579 /drivers/acpi
parent9a51c6b1f9e0239a9435db036b212498a2a3b75c (diff)
downloadlinux-bb1869012d7b78d1474808cb4c8bd8b272645876.tar.xz
ACPI: PM: Call pm_set_suspend_via_firmware() during hibernation
On systems with ACPI platform firmware the last stage of hibernation is analogous to system suspend to S3 (suspend-to-RAM), so it should be handled analogously. In particular, pm_suspend_via_firmware() should return 'true' in that stage to let the callers of it know that control will be passed to the platform firmware going forward, so pm_set_suspend_via_firmware() needs to be called then in analogy with acpi_suspend_begin(). However, the platform hibernation ->begin() callback is invoked during the "freeze" transition (before creating a snapshot image of system memory) as well as during the "hibernate" transition which is the last stage of it and pm_set_suspend_via_firmware() should be invoked by that callback in the latter stage only. In order to implement that redefine the hibernation ->begin() callback to take a pm_message_t argument to indicate which stage of hibernation is taking place and rework acpi_hibernation_begin() and acpi_hibernation_begin_old() to take it into account as needed. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/acpi')
-rw-r--r--drivers/acpi/sleep.c39
1 files changed, 24 insertions, 15 deletions
diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c
index e52f1238d2d6..a34deccd7317 100644
--- a/drivers/acpi/sleep.c
+++ b/drivers/acpi/sleep.c
@@ -1132,15 +1132,19 @@ void __init acpi_no_s4_hw_signature(void)
nosigcheck = true;
}
-static int acpi_hibernation_begin(void)
+static int acpi_hibernation_begin(pm_message_t stage)
{
- int error;
+ if (!nvs_nosave) {
+ int error = suspend_nvs_alloc();
+ if (error)
+ return error;
+ }
- error = nvs_nosave ? 0 : suspend_nvs_alloc();
- if (!error)
- acpi_pm_start(ACPI_STATE_S4);
+ if (stage.event == PM_EVENT_HIBERNATE)
+ pm_set_suspend_via_firmware();
- return error;
+ acpi_pm_start(ACPI_STATE_S4);
+ return 0;
}
static int acpi_hibernation_enter(void)
@@ -1200,7 +1204,7 @@ static const struct platform_hibernation_ops acpi_hibernation_ops = {
* function is used if the pre-ACPI 2.0 suspend ordering has been
* requested.
*/
-static int acpi_hibernation_begin_old(void)
+static int acpi_hibernation_begin_old(pm_message_t stage)
{
int error;
/*
@@ -1211,16 +1215,21 @@ static int acpi_hibernation_begin_old(void)
acpi_sleep_tts_switch(ACPI_STATE_S4);
error = acpi_sleep_prepare(ACPI_STATE_S4);
+ if (error)
+ return error;
- if (!error) {
- if (!nvs_nosave)
- error = suspend_nvs_alloc();
- if (!error) {
- acpi_target_sleep_state = ACPI_STATE_S4;
- acpi_scan_lock_acquire();
- }
+ if (!nvs_nosave) {
+ error = suspend_nvs_alloc();
+ if (error)
+ return error;
}
- return error;
+
+ if (stage.event == PM_EVENT_HIBERNATE)
+ pm_set_suspend_via_firmware();
+
+ acpi_target_sleep_state = ACPI_STATE_S4;
+ acpi_scan_lock_acquire();
+ return 0;
}
/*