From 4cd078dc654d7ead65746fba04b06e5ab7e97bff Mon Sep 17 00:00:00 2001
From: Prike Liang <Prike.Liang@amd.com>
Date: Wed, 9 Sep 2020 10:55:39 +0800
Subject: drm/amdgpu: add s0i3 capacity check for s0i3 routine (v2)

add amdgpu_acpi_is_s0ix_supported() to check the platform
whether support s0i3.

v2: fix empty function parameters warning (void)

Signed-off-by: Prike Liang <Prike.Liang@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

(limited to 'drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c')

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c
index 165b02e267b0..4f4fda53c08a 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c
@@ -27,6 +27,7 @@
 #include <linux/power_supply.h>
 #include <linux/pm_runtime.h>
 #include <acpi/video.h>
+#include <acpi/actbl.h>
 
 #include <drm/drm_crtc_helper.h>
 #include "amdgpu.h"
@@ -894,3 +895,16 @@ void amdgpu_acpi_fini(struct amdgpu_device *adev)
 	unregister_acpi_notifier(&adev->acpi_nb);
 	kfree(adev->atif);
 }
+
+/**
+ * amdgpu_acpi_is_s0ix_supported
+ *
+ * returns true if supported, false if not.
+ */
+bool amdgpu_acpi_is_s0ix_supported(void)
+{
+	if (acpi_gbl_FADT.flags & ACPI_FADT_LOW_POWER_S0)
+		return true;
+
+	return false;
+}
-- 
cgit