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authorBob Moore <robert.moore@intel.com>2011-11-16 10:57:28 +0800
committerLen Brown <len.brown@intel.com>2012-01-17 03:36:28 -0500
commit22e5b40ab21fcac21db0ff25fbb844ffecc73a4a (patch)
tree6fe339a8c410d2f8f2a0f844c976046d3be47e17 /drivers/acpi/acpica/evevent.c
parent2355e10f07b2c550c671f98b68aedf323c299aeb (diff)
downloadblackbird-op-linux-22e5b40ab21fcac21db0ff25fbb844ffecc73a4a.tar.gz
blackbird-op-linux-22e5b40ab21fcac21db0ff25fbb844ffecc73a4a.zip
ACPI 5.0: Implement hardware-reduced option
If HW-reduced flag is set in the FADT, do not attempt to access or initialize any ACPI hardware, including SCI and global lock. No FACS will be present. Signed-off-by: Bob Moore <robert.moore@intel.com> Signed-off-by: Lin Ming <ming.m.lin@intel.com> Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'drivers/acpi/acpica/evevent.c')
-rw-r--r--drivers/acpi/acpica/evevent.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/acpi/acpica/evevent.c b/drivers/acpi/acpica/evevent.c
index d458b041e651..1f43be470199 100644
--- a/drivers/acpi/acpica/evevent.c
+++ b/drivers/acpi/acpica/evevent.c
@@ -71,6 +71,12 @@ acpi_status acpi_ev_initialize_events(void)
ACPI_FUNCTION_TRACE(ev_initialize_events);
+ /* If Hardware Reduced flag is set, there are no fixed events */
+
+ if (acpi_gbl_reduced_hardware) {
+ return_ACPI_STATUS(AE_OK);
+ }
+
/*
* Initialize the Fixed and General Purpose Events. This is done prior to
* enabling SCIs to prevent interrupts from occurring before the handlers
@@ -111,6 +117,12 @@ acpi_status acpi_ev_install_xrupt_handlers(void)
ACPI_FUNCTION_TRACE(ev_install_xrupt_handlers);
+ /* If Hardware Reduced flag is set, there is no ACPI h/w */
+
+ if (acpi_gbl_reduced_hardware) {
+ return_ACPI_STATUS(AE_OK);
+ }
+
/* Install the SCI handler */
status = acpi_ev_install_sci_handler();
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