From e49f711cc8f3bf8d719a9f5c86e79ecc0a72bf70 Mon Sep 17 00:00:00 2001 From: Zhao Yakui Date: Tue, 12 Aug 2008 10:20:22 +0800 Subject: ACPI: Add the support for _TTS object The _TTS object is defined in the section 7.3 of acpi 3.0b spec. The _TTS control method is executed by the OSPM at the beginning of the sleep transition process for S1,S2, S3, S4, and orderly S5 shutdown. OS will invoke _TTS before it has notified any native mode device drivers of the sleep state transition. The target sleeping state value is passed to the _TTS control method. The _TTS control method is also executed by the OSPM at the end of any sleep transition process when the system transitions to S0 from S1, S2, S3, or S4. The _TTS object should be evaluated after it has notified any native mode device drivers of the end of the sleep state transition. The working state value (0) is passed to the _TTS control method. So it is necessary to add the support for _TTS object. The _TTS object will be evaluated if it exists. At the same time a block notifier is added to the reboot notifier list so that the _TTS object will also be evaluated when the system shutdown. lenb: note that as of Sep 2008, I've not yet seen _TTS in any shipping BIOS. So this patch is to future-proof Linux, rather than fix the installed base. http://bugzilla.kernel.org/show_bug.cgi?id=11132 Signed-off-by: Zhao Yakui Signed-off-by: Li Shaohua Signed-off-by: Andi Kleen Signed-off-by: Len Brown --- drivers/acpi/sleep/main.c | 49 ++++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 48 insertions(+), 1 deletion(-) (limited to 'drivers/acpi/sleep') diff --git a/drivers/acpi/sleep/main.c b/drivers/acpi/sleep/main.c index d13194a..c7f0c9c 100644 --- a/drivers/acpi/sleep/main.c +++ b/drivers/acpi/sleep/main.c @@ -15,6 +15,7 @@ #include #include #include +#include #include @@ -24,6 +25,36 @@ u8 sleep_states[ACPI_S_STATE_COUNT]; +static void acpi_sleep_tts_switch(u32 acpi_state) +{ + union acpi_object in_arg = { ACPI_TYPE_INTEGER }; + struct acpi_object_list arg_list = { 1, &in_arg }; + acpi_status status = AE_OK; + + in_arg.integer.value = acpi_state; + status = acpi_evaluate_object(NULL, "\\_TTS", &arg_list, NULL); + if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { + /* + * OS can't evaluate the _TTS object correctly. Some warning + * message will be printed. But it won't break anything. + */ + printk(KERN_NOTICE "Failure in evaluating _TTS object\n"); + } +} + +static int tts_notify_reboot(struct notifier_block *this, + unsigned long code, void *x) +{ + acpi_sleep_tts_switch(ACPI_STATE_S5); + return NOTIFY_DONE; +} + +static struct notifier_block tts_notifier = { + .notifier_call = tts_notify_reboot, + .next = NULL, + .priority = 0, +}; + static int acpi_sleep_prepare(u32 acpi_state) { #ifdef CONFIG_ACPI_SLEEP @@ -131,6 +162,7 @@ static void acpi_pm_end(void) * failing transition to a sleep state. */ acpi_target_sleep_state = ACPI_STATE_S0; + acpi_sleep_tts_switch(acpi_target_sleep_state); } #endif /* CONFIG_PM_SLEEP */ @@ -155,6 +187,7 @@ static int acpi_suspend_begin(suspend_state_t pm_state) if (sleep_states[acpi_state]) { acpi_target_sleep_state = acpi_state; + acpi_sleep_tts_switch(acpi_target_sleep_state); } else { printk(KERN_ERR "ACPI does not support this state: %d\n", pm_state); @@ -313,6 +346,7 @@ void __init acpi_no_s4_hw_signature(void) static int acpi_hibernation_begin(void) { acpi_target_sleep_state = ACPI_STATE_S4; + acpi_sleep_tts_switch(acpi_target_sleep_state); return 0; } @@ -376,7 +410,15 @@ static struct platform_hibernation_ops acpi_hibernation_ops = { */ static int acpi_hibernation_begin_old(void) { - int error = acpi_sleep_prepare(ACPI_STATE_S4); + int error; + /* + * The _TTS object should always be evaluated before the _PTS object. + * When the old_suspended_ordering is true, the _PTS object is + * evaluated in the acpi_sleep_prepare. + */ + acpi_sleep_tts_switch(ACPI_STATE_S4); + + error = acpi_sleep_prepare(ACPI_STATE_S4); if (!error) acpi_target_sleep_state = ACPI_STATE_S4; @@ -596,5 +638,10 @@ int __init acpi_sleep_init(void) pm_power_off = acpi_power_off; } printk(")\n"); + /* + * Register the tts_notifier to reboot notifier list so that the _TTS + * object can also be evaluated when the system enters S5. + */ + register_reboot_notifier(&tts_notifier); return 0; } -- cgit v1.1 From d0c71fe7ebc180f1b7bc7da1d39a07fc19eec768 Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Sat, 4 Oct 2008 00:05:05 +0200 Subject: ACPI Suspend: Enable ACPI during resume if SCI_EN is not set On some machines, like for example MSI Wind U100, the BIOS doesn't enable ACPI before returning control to the OS, which sometimes causes resume to fail. This is against the ACPI specification, which clearly states that "When the platform is waking from an S1, S2 or S3 state, OSPM assumes the hardware is already in the ACPI mode and will not issue an ACPI_ENABLE", but it won't hurt to check the SCI_EN bit and enable ACPI during resume from S3 if this bit is not set. Fortunately, we already have acpi_enable() for that, so use it in the resume code path, before executing _BFS, in analogy with the resume-from-hibernation code path. NOTE: We aren't supposed to set SCI_EN directly, because it's owned by the hardware. Signed-off-by: Rafael J. Wysocki Pavel Machek Signed-off-by: Len Brown --- drivers/acpi/sleep/main.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'drivers/acpi/sleep') diff --git a/drivers/acpi/sleep/main.c b/drivers/acpi/sleep/main.c index c7f0c9c..5419938 100644 --- a/drivers/acpi/sleep/main.c +++ b/drivers/acpi/sleep/main.c @@ -233,6 +233,8 @@ static int acpi_suspend_enter(suspend_state_t pm_state) break; } + /* If ACPI is not enabled by the BIOS, we need to enable it here. */ + acpi_enable(); /* Reprogram control registers and execute _BFS */ acpi_leave_sleep_state_prep(acpi_state); -- cgit v1.1 From 4fb507b6b764195bb7821cf2baa988f6eb677d30 Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Tue, 14 Oct 2008 22:54:06 +0200 Subject: ACPI suspend: Blacklist HP xw4600 Workstation for old code ordering HP xw4600 Workstation is known to require the "old" (ie. compatible with ACPI 1.0) suspend code ordering, so blacklist it for this purpose. Signed-off-by: Rafael J. Wysocki Tested-by: John Brown Signed-off-by: Len Brown --- drivers/acpi/sleep/main.c | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'drivers/acpi/sleep') diff --git a/drivers/acpi/sleep/main.c b/drivers/acpi/sleep/main.c index 5419938..2a31270 100644 --- a/drivers/acpi/sleep/main.c +++ b/drivers/acpi/sleep/main.c @@ -331,6 +331,14 @@ static struct dmi_system_id __initdata acpisleep_dmi_table[] = { DMI_MATCH(DMI_BOARD_NAME, "KN9 Series(NF-CK804)"), }, }, + { + .callback = init_old_suspend_ordering, + .ident = "HP xw4600 Workstation", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), + DMI_MATCH(DMI_PRODUCT_NAME, "HP xw4600 Workstation"), + }, + }, {}, }; #endif /* CONFIG_SUSPEND */ -- cgit v1.1