From ac9eafbe930abb589e9289842a99cc575cadb854 Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Thu, 1 Aug 2019 19:31:10 +0200 Subject: [PATCH] ACPI: PM: s2idle: Execute LPS0 _DSM functions with suspended devices According to Section 3.5 of the "Intel Low Power S0 Idle" document [1], Function 5 of the LPS0 _DSM is expected to be invoked when the system configuration matches the criteria for entering the target low-power state of the platform. In particular, this means that all devices should be suspended and in low-power states already when that function is invoked. This is not the case currently, however, because Function 5 of the LPS0 _DSM is invoked by it before the "noirq" phase of device suspend, which means that some devices may not have been put into low-power states yet at that point. That is a consequence of the previous design of the suspend-to-idle flow that allowed the "noirq" phase of device suspend and the "noirq" phase of device resume to be carried out for multiple times while "suspended" (if any spurious wakeup events were detected) and the point of the LPS0 _DSM Function 5 invocation was chosen so as to call it (and LPS0 _DSM Function 6 analogously) once per suspend-resume cycle (regardless of how many times the "noirq" phases of device suspend and resume were carried out while "suspended"). Now that the suspend-to-idle flow has been redesigned to carry out the "noirq" phases of device suspend and resume once in each cycle, the code can be reordered to follow the specification that it is based on more closely. For this purpose, add ->prepare_late and ->restore_early platform callbacks for suspend-to-idle, to be executed, respectively, after the "noirq" phase of suspending devices and before the "noirq" phase of resuming them and make ACPI use them for the invocation of LPS0 _DSM functions as appropriate. While at it, move the LPS0 entry requirements check to be made before invoking Functions 3 and 5 of the LPS0 _DSM (also once per cycle) as follows from the specification [1]. Link: https://uefi.org/sites/default/files/resources/Intel_ACPI_Low_Power_S0_Idle.pdf # [1] Signed-off-by: Rafael J. Wysocki Tested-by: Kai-Heng Feng --- drivers/acpi/sleep.c | 36 ++++++++++++++++++++++++------------ include/linux/suspend.h | 2 ++ kernel/power/suspend.c | 12 +++++++++--- 3 files changed, 35 insertions(+), 15 deletions(-) diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c index 864bb18..8f7e95f 100644 --- a/drivers/acpi/sleep.c +++ b/drivers/acpi/sleep.c @@ -954,11 +954,6 @@ static int acpi_s2idle_begin(void) static int acpi_s2idle_prepare(void) { - if (lps0_device_handle && !sleep_no_lps0) { - acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_OFF); - acpi_sleep_run_lps0_dsm(ACPI_LPS0_ENTRY); - } - if (acpi_sci_irq_valid()) enable_irq_wake(acpi_sci_irq); @@ -972,11 +967,22 @@ static int acpi_s2idle_prepare(void) return 0; } -static void acpi_s2idle_wake(void) +static int acpi_s2idle_prepare_late(void) { - if (lps0_device_handle && !sleep_no_lps0 && pm_debug_messages_on) + if (!lps0_device_handle || sleep_no_lps0) + return 0; + + if (pm_debug_messages_on) lpi_check_constraints(); + acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_OFF); + acpi_sleep_run_lps0_dsm(ACPI_LPS0_ENTRY); + + return 0; +} + +static void acpi_s2idle_wake(void) +{ /* * If IRQD_WAKEUP_ARMED is set for the SCI at this point, the SCI has * not triggered while suspended, so bail out. @@ -1011,6 +1017,15 @@ static void acpi_s2idle_wake(void) rearm_wake_irq(acpi_sci_irq); } +static void acpi_s2idle_restore_early(void) +{ + if (!lps0_device_handle || sleep_no_lps0) + return; + + acpi_sleep_run_lps0_dsm(ACPI_LPS0_EXIT); + acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_ON); +} + static void acpi_s2idle_restore(void) { s2idle_wakeup = false; @@ -1021,11 +1036,6 @@ static void acpi_s2idle_restore(void) if (acpi_sci_irq_valid()) disable_irq_wake(acpi_sci_irq); - - if (lps0_device_handle && !sleep_no_lps0) { - acpi_sleep_run_lps0_dsm(ACPI_LPS0_EXIT); - acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_ON); - } } static void acpi_s2idle_end(void) @@ -1036,7 +1046,9 @@ static void acpi_s2idle_end(void) static const struct platform_s2idle_ops acpi_s2idle_ops = { .begin = acpi_s2idle_begin, .prepare = acpi_s2idle_prepare, + .prepare_late = acpi_s2idle_prepare_late, .wake = acpi_s2idle_wake, + .restore_early = acpi_s2idle_restore_early, .restore = acpi_s2idle_restore, .end = acpi_s2idle_end, }; diff --git a/include/linux/suspend.h b/include/linux/suspend.h index f0c4a84..6fc8843 100644 --- a/include/linux/suspend.h +++ b/include/linux/suspend.h @@ -190,7 +190,9 @@ struct platform_suspend_ops { struct platform_s2idle_ops { int (*begin)(void); int (*prepare)(void); + int (*prepare_late)(void); void (*wake)(void); + void (*restore_early)(void); void (*restore)(void); void (*end)(void); }; diff --git a/kernel/power/suspend.c b/kernel/power/suspend.c index 2b60578..ed9ddef 100644 --- a/kernel/power/suspend.c +++ b/kernel/power/suspend.c @@ -253,13 +253,19 @@ static int platform_suspend_prepare_late(suspend_state_t state) static int platform_suspend_prepare_noirq(suspend_state_t state) { - return state != PM_SUSPEND_TO_IDLE && suspend_ops->prepare_late ? - suspend_ops->prepare_late() : 0; + if (state == PM_SUSPEND_TO_IDLE) { + if (s2idle_ops && s2idle_ops->prepare_late) + return s2idle_ops->prepare_late(); + } + return suspend_ops->prepare_late ? suspend_ops->prepare_late() : 0; } static void platform_resume_noirq(suspend_state_t state) { - if (state != PM_SUSPEND_TO_IDLE && suspend_ops->wake) + if (state == PM_SUSPEND_TO_IDLE) { + if (s2idle_ops && s2idle_ops->restore_early) + s2idle_ops->restore_early(); + } else if (suspend_ops->wake) suspend_ops->wake(); } -- 2.7.4