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authorRafael J. Wysocki <rjw@sisk.pl>2010-06-08 10:49:08 +0200
committerLen Brown <len.brown@intel.com>2010-06-12 00:44:37 -0400
commitfd247447c1d94a79d5cfc647430784306b3a8323 (patch)
treed3a58bb5e50068f4d9245f0788e7f14ff56ac711 /include/acpi
parente4e9a735991c80fb0fc1bd4a13a93681c3c17ce0 (diff)
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ACPI / ACPICA: Fix low-level GPE manipulation code
ACPICA uses acpi_ev_enable_gpe() for enabling GPEs at the low level, which is incorrect, because this function only enables the GPE if the corresponding bit in its enable register's enable_for_run mask is set. This causes acpi_set_gpe() to work incorrectly if used for enabling GPEs that were not previously enabled with acpi_enable_gpe(). As a result, among other things, wakeup-only GPEs are never enabled by acpi_enable_wakeup_device(), so the devices that use them are unable to wake up the system. To fix this issue remove acpi_ev_enable_gpe() and its counterpart acpi_ev_disable_gpe() and replace acpi_hw_low_disable_gpe() with acpi_hw_low_set_gpe() that will be used instead to manipulate GPE enable bits at the low level. Make the users of acpi_ev_enable_gpe() and acpi_ev_disable_gpe() call acpi_hw_low_set_gpe() instead and make sure that GPE enable masks are only updated by acpi_enable_gpe() and acpi_disable_gpe() when GPE reference counters change from 0 to 1 and from 1 to 0, respectively. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'include/acpi')
-rw-r--r--include/acpi/actypes.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/acpi/actypes.h b/include/acpi/actypes.h
index de5e99a9953..6881f5b7b7b 100644
--- a/include/acpi/actypes.h
+++ b/include/acpi/actypes.h
@@ -663,7 +663,7 @@ typedef u32 acpi_event_status;
#define ACPI_GPE_MAX 0xFF
#define ACPI_NUM_GPE 256
-/* Actions for acpi_set_gpe */
+/* Actions for acpi_set_gpe and acpi_hw_low_set_gpe */
#define ACPI_GPE_ENABLE 0
#define ACPI_GPE_DISABLE 1