From: Lv Zheng <lv.zheng@intel.com>
Subject: [PATCH] ACPICA: Events: Stop unconditionally clearing ACPI IRQs' status

This patch removes ACPI IRQ status clearing code for suspend/resume
procedures. They are not required, and may lead to false IRQ missing.

However this is an experimental fix, as the drivers may not support to
gracefully shutdown related ACPI IRQs. Fixed by Lv Zheng.

Link: https://bugzilla.kernel.org/show_bug.cgi?id=196249
Signed-off-by: Lv Zheng <lv.zheng@intel.com>
---
Index: linux-acpica/drivers/acpi/acpica/hwgpe.c
===================================================================
--- linux-acpica.orig/drivers/acpi/acpica/hwgpe.c
+++ linux-acpica/drivers/acpi/acpica/hwgpe.c
@@ -497,7 +497,6 @@ acpi_status acpi_hw_disable_all_gpes(voi
 	ACPI_FUNCTION_TRACE(hw_disable_all_gpes);
 
 	status = acpi_ev_walk_gpe_list(acpi_hw_disable_gpe_block, NULL);
-	status = acpi_ev_walk_gpe_list(acpi_hw_clear_gpe_block, NULL);
 	return_ACPI_STATUS(status);
 }
 
Index: linux-acpica/drivers/acpi/acpica/hwsleep.c
===================================================================
--- linux-acpica.orig/drivers/acpi/acpica/hwsleep.c
+++ linux-acpica/drivers/acpi/acpica/hwsleep.c
@@ -85,15 +85,8 @@ acpi_status acpi_hw_legacy_sleep(u8 slee
 		return_ACPI_STATUS(status);
 	}
 
-	/* Clear all fixed and general purpose status bits */
-
-	status = acpi_hw_clear_acpi_status();
-	if (ACPI_FAILURE(status)) {
-		return_ACPI_STATUS(status);
-	}
-
 	/*
-	 * 1) Disable/Clear all GPEs
+	 * 1) Disable all GPEs
 	 * 2) Enable all wakeup GPEs
 	 */
 	status = acpi_hw_disable_all_gpes();
@@ -299,7 +292,7 @@ acpi_status acpi_hw_legacy_wake(u8 sleep
 	 * might get fired there
 	 *
 	 * Restore the GPEs:
-	 * 1) Disable/Clear all GPEs
+	 * 1) Disable all GPEs
 	 * 2) Enable all runtime GPEs
 	 */
 	status = acpi_hw_disable_all_gpes();
Index: linux-acpica/drivers/acpi/acpica/hwxfsleep.c
===================================================================
--- linux-acpica.orig/drivers/acpi/acpica/hwxfsleep.c
+++ linux-acpica/drivers/acpi/acpica/hwxfsleep.c
@@ -202,7 +202,7 @@ acpi_status acpi_enter_sleep_state_s4bio
 	}
 
 	/*
-	 * 1) Disable/Clear all GPEs
+	 * 1) Disable all GPEs
 	 * 2) Enable all wakeup GPEs
 	 */
 	status = acpi_hw_disable_all_gpes();
Index: linux-acpica/drivers/acpi/acpica/evgpe.c
===================================================================
--- linux-acpica.orig/drivers/acpi/acpica/evgpe.c
+++ linux-acpica/drivers/acpi/acpica/evgpe.c
@@ -115,13 +115,6 @@ acpi_status acpi_ev_enable_gpe(struct ac
 
 	ACPI_FUNCTION_TRACE(ev_enable_gpe);
 
-	/* Clear the GPE (of stale events) */
-
-	status = acpi_hw_clear_gpe(gpe_event_info);
-	if (ACPI_FAILURE(status)) {
-		return_ACPI_STATUS(status);
-	}
-
 	/* Enable the requested GPE */
 
 	status = acpi_hw_low_set_gpe(gpe_event_info, ACPI_GPE_ENABLE);