drm/amdgpu: add amdgpu_gfx_state_change_set() set gfx power change entry (v2)

The new amdgpu_gfx_state_change_set() funtion can support set GFX power
change status to D0/D3.

v2: squash in warning fix (Alex)

Signed-off-by: Prike Liang <[e-mail]>
Acked-by: Huang Rui <[e-mail]>
Reviewed-by: Alex Deucher <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

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

···
 	}
 	return amdgpu_num_kcq;
 }
+
+/* amdgpu_gfx_state_change_set - Handle gfx power state change set
+ * @adev: amdgpu_device pointer
+ * @state: gfx power state(1 -sGpuChangeState_D0Entry and 2 -sGpuChangeState_D3Entry)
+ *
+ */
+
+void amdgpu_gfx_state_change_set(struct amdgpu_device *adev, enum gfx_change_state state)
+{
+
+	mutex_lock(&adev->pm.mutex);
+
+	if (adev->powerplay.pp_funcs &&
+	    adev->powerplay.pp_funcs->gfx_state_change_set)
+			((adev)->powerplay.pp_funcs->gfx_state_change_set(
+					(adev)->powerplay.pp_handle, state));
+
+	mutex_unlock(&adev->pm.mutex);
+
+}

drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.h

···
 	AMDGPU_GFX_PIPE_PRIO_MAX
 };
 
+/* Argument for PPSMC_MSG_GpuChangeState */
+enum gfx_change_state {
+	sGpuChangeState_D0Entry = 1,
+	sGpuChangeState_D3Entry,
+};
+
 #define AMDGPU_GFX_QUEUE_PRIORITY_MINIMUM  0
 #define AMDGPU_GFX_QUEUE_PRIORITY_MAXIMUM  15
 
···
 uint32_t amdgpu_kiq_rreg(struct amdgpu_device *adev, uint32_t reg);
 void amdgpu_kiq_wreg(struct amdgpu_device *adev, uint32_t reg, uint32_t v);
 int amdgpu_gfx_get_num_kcq(struct amdgpu_device *adev);
+void amdgpu_gfx_state_change_set(struct amdgpu_device *adev, enum gfx_change_state state);
 #endif

drivers/gpu/drm/amd/include/kgd_pp_interface.h

···
 	int (*odn_edit_dpm_table)(void *handle, uint32_t type, long *input, uint32_t size);
 	int (*set_mp1_state)(void *handle, enum pp_mp1_state mp1_state);
 	int (*smu_i2c_bus_access)(void *handle, bool acquire);
+	int (*gfx_state_change_set)(void *handle, uint32_t state);
 /* export to DC */
 	u32 (*get_sclk)(void *handle, bool low);
 	u32 (*get_mclk)(void *handle, bool low);

drivers/gpu/drm/amd/pm/inc/hwmgr.h

···
 	int (*disable_power_features_for_compute_performance)(struct pp_hwmgr *hwmgr,
 					bool disable);
 	ssize_t (*get_gpu_metrics)(struct pp_hwmgr *hwmgr, void **table);
+	int (*gfx_state_change)(struct pp_hwmgr *hwmgr, uint32_t state);
 };
 
 struct pp_table_func {

drivers/gpu/drm/amd/pm/inc/rv_ppsmc.h

···
 #define PPSMC_MSG_SetSoftMaxVcn                 0x34
 #define PPSMC_MSG_PowerGateMmHub                0x35
 #define PPSMC_MSG_SetRccPfcPmeRestoreRegister   0x36
-#define PPSMC_Message_Count                     0x37
+#define PPSMC_MSG_GpuChangeState                0x37
+#define PPSMC_Message_Count                     0x42
 
 typedef uint16_t PPSMC_Result;
 typedef int      PPSMC_Msg;

drivers/gpu/drm/amd/pm/powerplay/amd_powerplay.c

···
 	return size;
 }
 
+static int pp_gfx_state_change_set(void *handle, uint32_t state)
+{
+	struct pp_hwmgr *hwmgr = handle;
+
+	if (!hwmgr || !hwmgr->pm_en)
+		return -EINVAL;
+
+	if (hwmgr->hwmgr_func->gfx_state_change == NULL) {
+		pr_info_ratelimited("%s was not implemented.\n", __func__);
+		return -EINVAL;
+	}
+
+	mutex_lock(&hwmgr->smu_lock);
+	hwmgr->hwmgr_func->gfx_state_change(hwmgr, state);
+	mutex_unlock(&hwmgr->smu_lock);
+	return 0;
+}
+
 static const struct amd_pm_funcs pp_dpm_funcs = {
 	.load_firmware = pp_dpm_load_fw,
 	.wait_for_fw_loading_complete = pp_dpm_fw_loading_complete,
···
 	.set_df_cstate = pp_set_df_cstate,
 	.set_xgmi_pstate = pp_set_xgmi_pstate,
 	.get_gpu_metrics = pp_get_gpu_metrics,
+	.gfx_state_change_set = pp_gfx_state_change_set,
 };

drivers/gpu/drm/amd/pm/powerplay/hwmgr/smu10_hwmgr.c

···
 	return 0;
 }
 
+static int smu10_gfx_state_change(struct pp_hwmgr *hwmgr, uint32_t state)
+{
+	smum_send_msg_to_smc_with_parameter(hwmgr, PPSMC_MSG_GpuChangeState, state, NULL);
+
+	return 0;
+}
+
 static const struct pp_hwmgr_func smu10_hwmgr_funcs = {
 	.backend_init = smu10_hwmgr_backend_init,
 	.backend_fini = smu10_hwmgr_backend_fini,
···
 	.set_power_profile_mode = smu10_set_power_profile_mode,
 	.asic_reset = smu10_asic_reset,
 	.set_fine_grain_clk_vol = smu10_set_fine_grain_clk_vol,
+	.gfx_state_change = smu10_gfx_state_change,
 };
 
 int smu10_init_function_pointers(struct pp_hwmgr *hwmgr)