drm/amd/powerplay: add vega12 SMU gfxoff support v3

Export apis for enabling/disabling SMU gfxoff support.

v2: fit the latest gfxoff support framework
v3: add feature_mask control
Signed-off-by: Evan Quan <evan.quan@amd.com>
Reviewed-by: Huang Rui <ray.huang at amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c

@@ -3769,6 +3769,11 @@ static int gfx_v9_0_set_powergating_state(void *handle,
 		/* update mgcg state */
 		gfx_v9_0_update_gfx_mg_power_gating(adev, enable);
 
+		/* set gfx off through smu */
+		if (enable && adev->powerplay.pp_funcs->set_powergating_by_smu)
+			amdgpu_dpm_set_powergating_by_smu(adev, AMD_IP_BLOCK_TYPE_GFX, true);
+		break;
+	case CHIP_VEGA12:
 		/* set gfx off through smu */
 		if (enable && adev->powerplay.pp_funcs->set_powergating_by_smu)
 			amdgpu_dpm_set_powergating_by_smu(adev, AMD_IP_BLOCK_TYPE_GFX, true);

drivers/gpu/drm/amd/powerplay/hwmgr/vega12_hwmgr.c

@@ -423,6 +423,11 @@ static int vega12_hwmgr_backend_init(struct pp_hwmgr *hwmgr)
 			hwmgr->thermal_controller.advanceFanControlParameters.usFanPWMMinLimit *
 			hwmgr->thermal_controller.fanInfo.ulMaxRPM / 100;
 
+	if (hwmgr->feature_mask & PP_GFXOFF_MASK)
+		data->gfxoff_controlled_by_driver = true;
+	else
+		data->gfxoff_controlled_by_driver = false;
+
 	return result;
 }
 
@@ -2328,6 +2333,38 @@ static int vega12_get_thermal_temperature_range(struct pp_hwmgr *hwmgr,
 	return 0;
 }
 
+static int vega12_enable_gfx_off(struct pp_hwmgr *hwmgr)
+{
+	struct vega12_hwmgr *data =
+			(struct vega12_hwmgr *)(hwmgr->backend);
+	int ret = 0;
+
+	if (data->gfxoff_controlled_by_driver)
+		ret = smum_send_msg_to_smc(hwmgr, PPSMC_MSG_AllowGfxOff);
+
+	return ret;
+}
+
+static int vega12_disable_gfx_off(struct pp_hwmgr *hwmgr)
+{
+	struct vega12_hwmgr *data =
+			(struct vega12_hwmgr *)(hwmgr->backend);
+	int ret = 0;
+
+	if (data->gfxoff_controlled_by_driver)
+		ret = smum_send_msg_to_smc(hwmgr, PPSMC_MSG_DisallowGfxOff);
+
+	return ret;
+}
+
+static int vega12_gfx_off_control(struct pp_hwmgr *hwmgr, bool enable)
+{
+	if (enable)
+		return vega12_enable_gfx_off(hwmgr);
+	else
+		return vega12_disable_gfx_off(hwmgr);
+}
+
 static const struct pp_hwmgr_func vega12_hwmgr_funcs = {
 	.backend_init = vega12_hwmgr_backend_init,
 	.backend_fini = vega12_hwmgr_backend_fini,
@@ -2377,6 +2414,7 @@ static const struct pp_hwmgr_func vega12_hwmgr_funcs = {
 	.get_thermal_temperature_range = vega12_get_thermal_temperature_range,
 	.register_irq_handlers = smu9_register_irq_handlers,
 	.start_thermal_controller = vega12_start_thermal_controller,
+	.powergate_gfx = vega12_gfx_off_control,
 };
 
 int vega12_hwmgr_init(struct pp_hwmgr *hwmgr)

drivers/gpu/drm/amd/powerplay/hwmgr/vega12_hwmgr.h

@@ -393,6 +393,9 @@ struct vega12_hwmgr {
 	struct vega12_smc_state_table  smc_state_table;
 
 	struct vega12_clock_range      clk_range[PPCLK_COUNT];
+
+	/* ---- Gfxoff ---- */
+	bool                           gfxoff_controlled_by_driver;
 };
 
 #define VEGA12_DPM2_NEAR_TDP_DEC                      10