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ACPI: introduce kernel parameter acpi_sleep=sci_force_enable

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Introduce kernel parameter acpi_sleep=sci_force_enable

some laptop requires SCI_EN being set directly on resume,
or else they hung somewhere in the resume code path.

We already have a blacklist for these laptops but we still need
this option, especially when debugging some suspend/resume problems,
in case there are systems that need this workaround and are not yet
in the blacklist.

Signed-off-by: Zhang Rui <[email protected]>
Acked-by: Rafael J. Wysocki <[email protected]>
Signed-off-by: Len Brown <[email protected]>
This commit is contained in:
Zhang Rui 2009-12-30 15:36:42 +08:00 • committed by Len Brown
commit d7f0eea9e4
4 changed files with 24 additions and 13 deletions
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29
drivers/acpi/sleep.c
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@ -80,6 +80,23 @@ static int acpi_sleep_prepare(u32 acpi_state)
#ifdef CONFIG_ACPI_SLEEP
static u32 acpi_target_sleep_state = ACPI_STATE_S0;
/*
* According to the ACPI specification the BIOS should make sure that ACPI is
* enabled and SCI_EN bit is set on wake-up from S1 - S3 sleep states. Still,
* some BIOSes don't do that and therefore we use acpi_enable() to enable ACPI
* on such systems during resume. Unfortunately that doesn't help in
* particularly pathological cases in which SCI_EN has to be set directly on
* resume, although the specification states very clearly that this flag is
* owned by the hardware. The set_sci_en_on_resume variable will be set in such
* cases.
*/
static bool set_sci_en_on_resume;
void __init acpi_set_sci_en_on_resume(void)
{
set_sci_en_on_resume = true;
}
/*
* ACPI 1.0 wants us to execute _PTS before suspending devices, so we allow the
* user to request that behavior by using the 'acpi_old_suspend_ordering'
@ -170,18 +187,6 @@ static void acpi_pm_end(void)
#endif /* CONFIG_ACPI_SLEEP */
#ifdef CONFIG_SUSPEND
/*
* According to the ACPI specification the BIOS should make sure that ACPI is
* enabled and SCI_EN bit is set on wake-up from S1 - S3 sleep states. Still,
* some BIOSes don't do that and therefore we use acpi_enable() to enable ACPI
* on such systems during resume. Unfortunately that doesn't help in
* particularly pathological cases in which SCI_EN has to be set directly on
* resume, although the specification states very clearly that this flag is
* owned by the hardware. The set_sci_en_on_resume variable will be set in such
* cases.
*/
static bool set_sci_en_on_resume;
extern void do_suspend_lowlevel(void);
static u32 acpi_suspend_states[] = {