diff options
| author | Lv Zheng <lv.zheng@intel.com> | 2014-06-15 04:42:31 +0400 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2014-07-07 03:08:14 +0400 |
| commit | 6ec5e12074b42fafec2a340d72e8d8e1fd4c5405 (patch) | |
| tree | 753cb7ed78e5a60d993440ac6fb5864422cb21f0 | |
| parent | 0a00fd5e20fd5dc89e976e163588d7c54edaf745 (diff) | |
| download | linux-6ec5e12074b42fafec2a340d72e8d8e1fd4c5405.tar.xz | |
ACPICA: Events: Fix edge-triggered GPE by disabling before acknowledging it.
Due to ACPI specificiation 5, chapter 5.6.4 General-Purpose Event Handling,
OSPMs need to disable GPE before clearing the status bit for edge-triggered
GPEs.
Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Tested-by: Gareth Williams <gareth@garethwilliams.me.uk>
Tested-by: Steffen Weber <steffen.weber@gmail.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
| -rw-r--r-- | drivers/acpi/acpica/evgpe.c | 32 |
1 files changed, 17 insertions, 15 deletions
diff --git a/drivers/acpi/acpica/evgpe.c b/drivers/acpi/acpica/evgpe.c index 48f70013b488..e4ba4dec86af 100644 --- a/drivers/acpi/acpica/evgpe.c +++ b/drivers/acpi/acpica/evgpe.c @@ -698,21 +698,6 @@ acpi_ev_gpe_dispatch(struct acpi_namespace_node *gpe_device, } /* - * If edge-triggered, clear the GPE status bit now. Note that - * level-triggered events are cleared after the GPE is serviced. - */ - if ((gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK) == - ACPI_GPE_EDGE_TRIGGERED) { - status = acpi_hw_clear_gpe(gpe_event_info); - if (ACPI_FAILURE(status)) { - ACPI_EXCEPTION((AE_INFO, status, - "Unable to clear GPE %02X", - gpe_number)); - return_UINT32(ACPI_INTERRUPT_NOT_HANDLED); - } - } - - /* * Always disable the GPE so that it does not keep firing before * any asynchronous activity completes (either from the execution * of a GPE method or an asynchronous GPE handler.) @@ -729,6 +714,23 @@ acpi_ev_gpe_dispatch(struct acpi_namespace_node *gpe_device, } /* + * If edge-triggered, clear the GPE status bit now. Note that + * level-triggered events are cleared after the GPE is serviced. + */ + if ((gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK) == + ACPI_GPE_EDGE_TRIGGERED) { + status = acpi_hw_clear_gpe(gpe_event_info); + if (ACPI_FAILURE(status)) { + ACPI_EXCEPTION((AE_INFO, status, + "Unable to clear GPE %02X", + gpe_number)); + (void)acpi_hw_low_set_gpe(gpe_event_info, + ACPI_GPE_CONDITIONAL_ENABLE); + return_UINT32(ACPI_INTERRUPT_NOT_HANDLED); + } + } + + /* * Dispatch the GPE to either an installed handler or the control * method associated with this GPE (_Lxx or _Exx). If a handler * exists, we invoke it and do not attempt to run the method. |