2 files changed, 61 insertions, 0 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index 435103e514cd..c215690670f2 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -1340,8 +1340,11 @@ struct amdgpu_afmt_acr amdgpu_afmt_acr(uint32_t clock);
 int amdgpu_acpi_init(struct amdgpu_device *adev);
 void amdgpu_acpi_fini(struct amdgpu_device *adev);
 bool amdgpu_acpi_is_pcie_performance_request_supported(struct amdgpu_device *adev);
+bool amdgpu_acpi_is_power_shift_control_supported(void);
 int amdgpu_acpi_pcie_performance_request(struct amdgpu_device *adev,
 						u8 perf_req, bool advertise);
+int amdgpu_acpi_power_shift_control(struct amdgpu_device *adev,
+				    u8 dev_state, bool drv_state);
 int amdgpu_acpi_pcie_notify_device_ready(struct amdgpu_device *adev);
 
 void amdgpu_acpi_get_backlight_caps(struct amdgpu_dm_backlight_caps *caps);
@@ -1352,6 +1355,9 @@ static inline int amdgpu_acpi_init(struct amdgpu_device *adev) { return 0; }
 static inline void amdgpu_acpi_fini(struct amdgpu_device *adev) { }
 static inline bool amdgpu_acpi_is_s0ix_supported(struct amdgpu_device *adev) { return false; }
 static inline void amdgpu_acpi_detect(void) { }
+static inline bool amdgpu_acpi_is_power_shift_control_supported(void) { return false; }
+static inline int amdgpu_acpi_power_shift_control(struct amdgpu_device *adev,
+						  u8 dev_state, bool drv_state) { return 0; }
 #endif
 
 int amdgpu_cs_find_mapping(struct amdgpu_cs_parser *parser,
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c
index bbff6c06f943..b631316bfe5b 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c
@@ -76,6 +76,7 @@ struct amdgpu_atcs_functions {
 	bool pcie_perf_req;
 	bool pcie_dev_rdy;
 	bool pcie_bus_width;
+	bool power_shift_control;
 };
 
 struct amdgpu_atcs {
@@ -534,6 +535,7 @@ static void amdgpu_atcs_parse_functions(struct amdgpu_atcs_functions *f, u32 mas
 	f->pcie_perf_req = mask & ATCS_PCIE_PERFORMANCE_REQUEST_SUPPORTED;
 	f->pcie_dev_rdy = mask & ATCS_PCIE_DEVICE_READY_NOTIFICATION_SUPPORTED;
 	f->pcie_bus_width = mask & ATCS_SET_PCIE_BUS_WIDTH_SUPPORTED;
+	f->power_shift_control = mask & ATCS_SET_POWER_SHIFT_CONTROL_SUPPORTED;
 }
 
 /**
@@ -599,6 +601,18 @@ bool amdgpu_acpi_is_pcie_performance_request_supported(struct amdgpu_device *ade
 }
 
 /**
+ * amdgpu_acpi_is_power_shift_control_supported
+ *
+ * Check if the ATCS power shift control method
+ * is supported.
+ * returns true if supported, false if not.
+ */
+bool amdgpu_acpi_is_power_shift_control_supported(void)
+{
+	return amdgpu_acpi_priv.atcs.functions.power_shift_control;
+}
+
+/**
  * amdgpu_acpi_pcie_notify_device_ready
  *
  * @adev: amdgpu_device pointer
@@ -700,6 +714,47 @@ int amdgpu_acpi_pcie_performance_request(struct amdgpu_device *adev,
 }
 
 /**
+ * amdgpu_acpi_power_shift_control
+ *
+ * @adev: amdgpu_device pointer
+ * @dev_state: device acpi state
+ * @drv_state: driver state
+ *
+ * Executes the POWER_SHIFT_CONTROL method to
+ * communicate current dGPU device state and
+ * driver state to APU/SBIOS.
+ * returns 0 on success, error on failure.
+ */
+int amdgpu_acpi_power_shift_control(struct amdgpu_device *adev,
+				    u8 dev_state, bool drv_state)
+{
+	union acpi_object *info;
+	struct amdgpu_atcs *atcs = &amdgpu_acpi_priv.atcs;
+	struct atcs_pwr_shift_input atcs_input;
+	struct acpi_buffer params;
+
+	if (!amdgpu_acpi_is_power_shift_control_supported())
+		return -EINVAL;
+
+	atcs_input.size = sizeof(struct atcs_pwr_shift_input);
+	/* dGPU id (bit 2-0: func num, 7-3: dev num, 15-8: bus num) */
+	atcs_input.dgpu_id = adev->pdev->devfn | (adev->pdev->bus->number << 8);
+	atcs_input.dev_acpi_state = dev_state;
+	atcs_input.drv_state = drv_state;
+
+	params.length = sizeof(struct atcs_pwr_shift_input);
+	params.pointer = &atcs_input;
+
+	info = amdgpu_atcs_call(atcs, ATCS_FUNCTION_POWER_SHIFT_CONTROL, &params);
+	if (!info) {
+		DRM_ERROR("ATCS PSC update failed\n");
+		return -EIO;
+	}
+
+	return 0;
+}
+
+/**
  * amdgpu_acpi_event - handle notify events
  *
  * @nb: notifier block