drm/amd/pm: Add function to wait for smu events

v1: Add function to wait for specific event/states from PMFW

v2: Add mutex lock, simplify sequence
Signed-off-by: Lijo Lazar <lijo.lazar@amd.com>
Reviewed-by: Feifei Xu <Feifei.Xu@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -195,6 +195,11 @@ struct smu_user_dpm_profile {
 	uint32_t clk_dependency;
 };
 
+enum smu_event_type {
+
+	SMU_EVENT_RESET_COMPLETE = 0,
+};
+
 #define SMU_TABLE_INIT(tables, table_id, s, a, d)	\
 	do {						\
 		tables[table_id].size = s;		\
@@ -338,7 +343,6 @@ struct smu_power_context {
 	struct smu_power_gate power_gate;
 };
 
-
 #define SMU_FEATURE_MAX	(64)
 struct smu_feature
 {
@@ -1167,6 +1171,12 @@ struct pptable_funcs {
 	 * @set_light_sbr:  Set light sbr mode for the SMU.
 	 */
 	int (*set_light_sbr)(struct smu_context *smu, bool enable);
+
+	/**
+	 * @wait_for_event:  Wait for events from SMU.
+	 */
+	int (*wait_for_event)(struct smu_context *smu,
+			      enum smu_event_type event, uint64_t event_arg);
 };
 
 typedef enum {
@@ -1283,5 +1293,8 @@ int smu_gfx_state_change_set(struct smu_context *smu, uint32_t state);
 
 int smu_set_light_sbr(struct smu_context *smu, bool enable);
 
+int smu_wait_for_event(struct amdgpu_device *adev, enum smu_event_type event,
+		       uint64_t event_arg);
+
 #endif
 #endif

drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c

@@ -2982,3 +2982,18 @@ static const struct amd_pm_funcs swsmu_pm_funcs = {
 	.display_disable_memory_clock_switch = smu_display_disable_memory_clock_switch,
 	.get_max_sustainable_clocks_by_dc    = smu_get_max_sustainable_clocks_by_dc,
 };
+
+int smu_wait_for_event(struct amdgpu_device *adev, enum smu_event_type event,
+		       uint64_t event_arg)
+{
+	int ret = -EINVAL;
+	struct smu_context *smu = &adev->smu;
+
+	if (smu->ppt_funcs->wait_for_event) {
+		mutex_lock(&smu->mutex);
+		ret = smu->ppt_funcs->wait_for_event(smu, event, event_arg);
+		mutex_unlock(&smu->mutex);
+	}
+
+	return ret;
+}