[PATCH AUTOSEL for 4.4 149/167] ACPICA: Events: Add runtime stub support for event APIs

Sasha Levin
2018-03-19T17:01:16Z

From: Lv Zheng <lv.zheng@intel.com>

[ Upstream commit 861ba6351c520328e94a78c923b415faa9116287 ]

ACPICA commit 99bc3beca92c6574ea1d69de42e54f872e6373ce

It is reported that on Linux, RTC driver complains wrong errors on
hardware reduced platform:
[ 4.085420] ACPI Warning: Could not enable fixed event - real_time_clock (4) (20160422/evxface-654)

This patch fixes this by correctly adding runtime reduced hardware check.
Reported by Chandan Tagore, fixed by Lv Zheng.

Link: https://github.com/acpica/acpica/commit/99bc3bec
Tested-by: Chandan Tagore <tagore.chandan@gmail.com>
Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
---
drivers/acpi/acpica/evxfevnt.c | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)

diff --git a/drivers/acpi/acpica/evxfevnt.c b/drivers/acpi/acpica/evxfevnt.c
index 10ce48e16ebf..d830705f8a18 100644
--- a/drivers/acpi/acpica/evxfevnt.c
+++ b/drivers/acpi/acpica/evxfevnt.c
@@ -180,6 +180,12 @@ acpi_status acpi_enable_event(u32 event, u32 flags)

ACPI_FUNCTION_TRACE(acpi_enable_event);

+ /* If Hardware Reduced flag is set, there are no fixed events */
+
+ if (acpi_gbl_reduced_hardware) {
+ return_ACPI_STATUS(AE_OK);
+ }
+
/* Decode the Fixed Event */

if (event > ACPI_EVENT_MAX) {
@@ -237,6 +243,12 @@ acpi_status acpi_disable_event(u32 event, u32 flags)

ACPI_FUNCTION_TRACE(acpi_disable_event);

+ /* If Hardware Reduced flag is set, there are no fixed events */
+
+ if (acpi_gbl_reduced_hardware) {
+ return_ACPI_STATUS(AE_OK);
+ }
+
/* Decode the Fixed Event */

if (event > ACPI_EVENT_MAX) {
@@ -290,6 +302,12 @@ acpi_status acpi_clear_event(u32 event)

ACPI_FUNCTION_TRACE(acpi_clear_event);

+ /* If Hardware Reduced flag is set, there are no fixed events */
+
+ if (acpi_gbl_reduced_hardware) {
+ return_ACPI_STATUS(AE_OK);
+ }
+
/* Decode the Fixed Event */

if (event > ACPI_EVENT_MAX) {
--
2.14.1