The patch titled ACPI suspend: Call _PTS before suspending devices has been added to the -mm tree. Its filename is acpi-suspend-call-_pts-before-suspending-devices.patch *** Remember to use Documentation/SubmitChecklist when testing your code *** See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find out what to do about this The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/ ------------------------------------------------------ Subject: ACPI suspend: Call _PTS before suspending devices From: Rafael J. Wysocki <rjw@xxxxxxx> The ACPI 1.0 specification wants us to put devices into low power states after executing the _PTS global control method, while ACPI 2.0 and later want us to do that in the reverse order. The current suspend code follows ACPI 2.0 in that respect which causes some ACPI 1.0x systems to hang during suspend (ref. http://bugzilla.kernel.org/show_bug.cgi?id=9528). Make the suspend code execute _PTS before putting devices into low power states (ie. in accordance with ACPI 1.0x) and provide a command line option to override the default if need be. Signed-off-by: Rafael J. Wysocki <rjw@xxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- Documentation/kernel-parameters.txt | 5 ++ drivers/acpi/sleep/main.c | 51 +++++++++++++++++++------- 2 files changed, 43 insertions(+), 13 deletions(-) diff -puN Documentation/kernel-parameters.txt~acpi-suspend-call-_pts-before-suspending-devices Documentation/kernel-parameters.txt --- a/Documentation/kernel-parameters.txt~acpi-suspend-call-_pts-before-suspending-devices +++ a/Documentation/kernel-parameters.txt @@ -167,6 +167,11 @@ and is between 256 and 4096 characters. acpi_irq_isa= [HW,ACPI] If irq_balance, mark listed IRQs used by ISA Format: <irq>,<irq>... + acpi_new_pts_ordering [HW,ACPI] + Enforce the ACPI 2.0 ordering of the _PTS control + method wrt putting devices into low power states + default: pre ACPI 2.0 ordering of _PTS + acpi_no_auto_ssdt [HW,ACPI] Disable automatic loading of SSDT acpi_os_name= [HW,ACPI] Tell ACPI BIOS the name of the OS diff -puN drivers/acpi/sleep/main.c~acpi-suspend-call-_pts-before-suspending-devices drivers/acpi/sleep/main.c --- a/drivers/acpi/sleep/main.c~acpi-suspend-call-_pts-before-suspending-devices +++ a/drivers/acpi/sleep/main.c @@ -26,6 +26,21 @@ u8 sleep_states[ACPI_S_STATE_COUNT]; #ifdef CONFIG_PM_SLEEP static u32 acpi_target_sleep_state = ACPI_STATE_S0; +static bool acpi_sleep_finish_wake_up; + +/* + * ACPI 2.0 and later want us to execute _PTS after suspending devices, so we + * allow the user to request that behavior by using the 'acpi_new_pts_ordering' + * kernel command line option that causes the following variable to be set. + */ +static bool new_pts_ordering; + +static int __init acpi_new_pts_ordering(char *str) +{ + new_pts_ordering = true; + return 1; +} +__setup("acpi_new_pts_ordering", acpi_new_pts_ordering); #endif static int acpi_sleep_prepare(u32 acpi_state) @@ -74,6 +89,14 @@ static int acpi_pm_begin(suspend_state_t if (sleep_states[acpi_state]) { acpi_target_sleep_state = acpi_state; + if (new_pts_ordering) + return 0; + + error = acpi_sleep_prepare(acpi_state); + if (error) + acpi_target_sleep_state = ACPI_STATE_S0; + else + acpi_sleep_finish_wake_up = true; } else { printk(KERN_ERR "ACPI does not support this state: %d\n", pm_state); @@ -91,15 +114,17 @@ static int acpi_pm_begin(suspend_state_t static int acpi_pm_prepare(void) { - int error; + if (new_pts_ordering) { + int error = acpi_sleep_prepare(acpi_target_sleep_state); - error = acpi_sleep_prepare(acpi_target_sleep_state); - if (error) - acpi_target_sleep_state = ACPI_STATE_S0; - else if (!ACPI_SUCCESS(acpi_hw_disable_all_gpes())) - error = -EFAULT; + if (error) { + acpi_target_sleep_state = ACPI_STATE_S0; + return error; + } + acpi_sleep_finish_wake_up = true; + } - return error; + return ACPI_SUCCESS(acpi_hw_disable_all_gpes()) ? 0 : -EFAULT; } /** @@ -123,10 +148,8 @@ static int acpi_pm_enter(suspend_state_t if (acpi_state == ACPI_STATE_S3) { int error = acpi_save_state_mem(); - if (error) { - acpi_target_sleep_state = ACPI_STATE_S0; + if (error) return error; - } } local_irq_save(flags); @@ -187,6 +210,7 @@ static void acpi_pm_finish(void) acpi_set_firmware_waking_vector((acpi_physical_address) 0); acpi_target_sleep_state = ACPI_STATE_S0; + acpi_sleep_finish_wake_up = false; #ifdef CONFIG_X86 if (init_8259A_after_S1) { @@ -203,10 +227,11 @@ static void acpi_pm_finish(void) static void acpi_pm_end(void) { /* - * This is necessary in case acpi_pm_finish() is not called during a - * failing transition to a sleep state. + * This is necessary in case acpi_pm_finish() is not called directly + * during a failing transition to a sleep state. */ - acpi_target_sleep_state = ACPI_STATE_S0; + if (acpi_sleep_finish_wake_up) + acpi_pm_finish(); } static int acpi_pm_state_valid(suspend_state_t pm_state) _ Patches currently in -mm which might be from rjw@xxxxxxx are git-acpi.patch suspend-introduce-begin-and-end-callbacks.patch acpi-separate-invocations-of-_gts-and-_bfs-from-_pts-and-_wak.patch acpi-separate-disabling-of-gpes-from-_pts.patch acpi-suspend-call-_pts-before-suspending-devices.patch hibernation-introduce-begin-and-end-callbacks.patch acpi-hibernation-call-_pts-before-suspending-devices.patch acpi-print-message-before-calling-_pts.patch revert-gregkh-driver-pm-acquire-device-locks-prior-to-suspending.patch gregkh-driver-kset-convert-to-kobj_sysfs_ops-vs-git-acpi.patch git-x86.patch git-xfs.patch cpufreq-initialise-default-governor-before-use.patch page-allocator-clean-up-pcp-draining-functions.patch page-allocator-clean-up-pcp-draining-functions-swsusp-fix.patch page-allocator-clean-up-pcp-draining-functions-swsusp-fix-fix.patch kernel-power-diskc-make-code-static.patch make-kernel_shutdown_prepare-static.patch pnp-do-not-stop-start-devices-in-suspend-resume-path.patch proc-fix-the-threaded-proc-self.patch shrink_slab-handle-bad-shrinkers.patch - To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html