Introduce AcpiAnyGpeStatusSet ()

Introduce a new helper function, AcpiAnyGpeStatusSet(), for
checking the status bits of all enabled GPEs in one go.

It is needed to distinguish spurious SCIs from genuine ones when
deciding whether or not to wake up the system from suspend-to-idle.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Erik Kaneda <erik.kaneda@intel.com>

4 files changed, 125 insertions, 0 deletions

diff --git a/source/components/events/evxfgpe.c b/source/components/events/evxfgpe.c
index 131021f12..d652c29fb 100644
--- a/source/components/events/evxfgpe.c
+++ b/source/components/events/evxfgpe.c
@@ -1065,6 +1065,44 @@ AcpiEnableAllWakeupGpes (
 ACPI_EXPORT_SYMBOL (AcpiEnableAllWakeupGpes)
 
 
+/******************************************************************************
+ *
+ * FUNCTION:    AcpiAnyGpeStatusSet
+ *
+ * PARAMETERS:  None
+ *
+ * RETURN:      Whether or not the status bit is set for any GPE
+ *
+ * DESCRIPTION: Check the status bits of all enabled GPEs and return TRUE if any
+ *              of them is set or FALSE otherwise.
+ *
+ ******************************************************************************/
+
+UINT32
+AcpiAnyGpeStatusSet (
+    void)
+{
+    ACPI_STATUS                Status;
+    UINT8                      Ret;
+
+
+    ACPI_FUNCTION_TRACE (AcpiAnyGpeStatusSet);
+
+    Status = AcpiUtAcquireMutex (ACPI_MTX_EVENTS);
+    if (ACPI_FAILURE (Status))
+    {
+        return (FALSE);
+    }
+
+    Ret = AcpiHwCheckAllGpes ();
+    (void) AcpiUtReleaseMutex (ACPI_MTX_EVENTS);
+
+    return (Ret);
+}
+
+ACPI_EXPORT_SYMBOL(AcpiAnyGpeStatusSet)
+
+
 /*******************************************************************************
  *
  * FUNCTION:    AcpiInstallGpeBlock
diff --git a/source/components/hardware/hwgpe.c b/source/components/hardware/hwgpe.c
index f0b32bd63..e8ad8926c 100644
--- a/source/components/hardware/hwgpe.c
+++ b/source/components/hardware/hwgpe.c
@@ -637,6 +637,58 @@ AcpiHwEnableWakeupGpeBlock (
 
 /******************************************************************************
  *
+ * FUNCTION:    AcpiHwGetGpeBlockStatus
+ *
+ * PARAMETERS:  GpeXruptInfo    - GPE Interrupt info
+ *              GpeBlock        - Gpe Block info
+ *
+ * RETURN:      Success
+ *
+ * DESCRIPTION: Produce a combined GPE status bits mask for the given block.
+ *
+ ******************************************************************************/
+
+static ACPI_STATUS
+AcpiHwGetGpeBlockStatus(
+    ACPI_GPE_XRUPT_INFO     *GpeXruptInfo,
+    ACPI_GPE_BLOCK_INFO     *GpeBlock,
+    void *RetPtr)
+{
+    ACPI_GPE_REGISTER_INFO  *GpeRegisterInfo;
+    UINT64                  InEnable;
+    UINT64                  InStatus;
+    ACPI_STATUS             Status;
+    UINT8                   *Ret = RetPtr;
+    UINT32                  i;
+
+
+    /* Examine each GPE Register within the block */
+
+    for (i = 0; i < GpeBlock->RegisterCount; i++)
+    {
+        GpeRegisterInfo = &GpeBlock->RegisterInfo[i];
+
+        Status = AcpiHwRead (&InEnable, &GpeRegisterInfo->EnableAddress);
+        if (ACPI_FAILURE (Status))
+        {
+            continue;
+        }
+
+        Status = AcpiHwRead (&InStatus, &GpeRegisterInfo->StatusAddress);
+        if (ACPI_FAILURE (Status))
+        {
+            continue;
+        }
+
+        *Ret |= InEnable & InStatus;
+    }
+
+    return (AE_OK);
+}
+
+
+/******************************************************************************
+ *
  * FUNCTION:    AcpiHwDisableAllGpes
  *
  * PARAMETERS:  None
@@ -715,4 +767,31 @@ AcpiHwEnableAllWakeupGpes (
     return_ACPI_STATUS (Status);
 }
 
+
+/******************************************************************************
+ *
+ * FUNCTION:    AcpiHwCheckAllGpes
+ *
+ * PARAMETERS:  None
+ *
+ * RETURN:      Combined status of all GPEs
+ *
+ * DESCRIPTION: Check all enabled GPEs in all GPE blocks and return TRUE if the
+ *              status bit is set for at least one of them of FALSE otherwise.
+ *
+ ******************************************************************************/
+
+UINT8
+AcpiHwCheckAllGpes (
+    void)
+{
+    UINT8                      Ret = 0;
+
+
+    ACPI_FUNCTION_TRACE (AcpiHwCheckAllGpes);
+
+    (void) AcpiEvWalkGpeList (AcpiHwGetGpeBlockStatus, &Ret);
+    return (Ret != 0);
+}
+
 #endif /* !ACPI_REDUCED_HARDWARE */
diff --git a/source/include/achware.h b/source/include/achware.h
index 646cef856..9ff14d957 100644
--- a/source/include/achware.h
+++ b/source/include/achware.h
@@ -315,6 +315,10 @@ ACPI_STATUS
 AcpiHwEnableAllWakeupGpes (
     void);
 
+UINT8
+AcpiHwCheckAllGpes (
+    void);
+
 ACPI_STATUS
 AcpiHwEnableRuntimeGpeBlock (
     ACPI_GPE_XRUPT_INFO     *GpeXruptInfo,
diff --git a/source/include/acpixf.h b/source/include/acpixf.h
index 10e5e79a4..c2df9f263 100644
--- a/source/include/acpixf.h
+++ b/source/include/acpixf.h
@@ -1109,6 +1109,10 @@ ACPI_STATUS
 AcpiEnableAllWakeupGpes (
     void))
 
+ACPI_HW_DEPENDENT_RETURN_UINT32 (
+    UINT32                  AcpiAnyGpeStatusSet (
+    void))
+
 ACPI_HW_DEPENDENT_RETURN_STATUS (
 ACPI_STATUS
 AcpiGetGpeDevice (