drm/amd/powerplay: add helper function to get dpm freq informations

this function can help driver to get ppclk informations
Signed-off-by: Kevin Wang <kevin1.wang@amd.com>
Reviewed-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/powerplay/amdgpu_smu.c

@@ -60,6 +60,43 @@ int smu_get_smc_version(struct smu_context *smu, uint32_t *if_version, uint32_t
 	return ret;
 }
 
+int smu_get_dpm_freq_by_index(struct smu_context *smu, enum smu_clk_type clk_type,
+			      uint16_t level, uint32_t *value)
+{
+	int ret = 0, clk_id = 0;
+	uint32_t param;
+
+	if (!value)
+		return -EINVAL;
+
+	clk_id = smu_clk_get_index(smu, clk_type);
+	if (clk_id < 0)
+		return clk_id;
+
+	param = (uint32_t)(((clk_id & 0xffff) << 16) | (level & 0xffff));
+
+	ret = smu_send_smc_msg_with_param(smu,SMU_MSG_GetDpmFreqByIndex,
+					  param);
+	if (ret)
+		return ret;
+
+	ret = smu_read_smc_arg(smu, &param);
+	if (ret)
+		return ret;
+
+	/* BIT31:  0 - Fine grained DPM, 1 - Dicrete DPM
+	 * now, we un-support it */
+	*value = param & 0x7fffffff;
+
+	return ret;
+}
+
+int smu_get_dpm_level_count(struct smu_context *smu, enum smu_clk_type clk_type,
+			    uint32_t *value)
+{
+	return smu_get_dpm_freq_by_index(smu, clk_type, 0xff, value);
+}
+
 int smu_dpm_set_power_gate(struct smu_context *smu, uint32_t block_type,
 			   bool gate)
 {

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

@@ -928,4 +928,8 @@ extern int smu_handle_task(struct smu_context *smu,
 			   enum amd_dpm_forced_level level,
 			   enum amd_pp_task task_id);
 int smu_get_smc_version(struct smu_context *smu, uint32_t *if_version, uint32_t *smu_version);
+int smu_get_dpm_freq_by_index(struct smu_context *smu, enum smu_clk_type clk_type,
+			      uint16_t level, uint32_t *value);
+int smu_get_dpm_level_count(struct smu_context *smu, enum smu_clk_type clk_type,
+			    uint32_t *value);
 #endif