drm/amd/powerplay: implement get_current_clk_freq for smu11

This patch implements get_current_clk_freq for smu11 future use.
Signed-off-by: Kevin Wang <Kevin1.Wang@amd.com>
Reviewed-by: Huang Rui <ray.huang@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -251,6 +251,7 @@ struct smu_funcs
 	int (*disable_all_mask)(struct smu_context *smu);
 	int (*notify_display_change)(struct smu_context *smu);
 	int (*get_power_limit)(struct smu_context *smu);
+	int (*get_current_clk_freq)(struct smu_context *smu, uint32_t clk_id, uint32_t *value);
 };
 
 #define smu_init_microcode(smu) \
@@ -327,6 +328,8 @@ struct smu_funcs
 	((smu)->ppt_funcs->populate_umd_state_clk ? (smu)->ppt_funcs->populate_umd_state_clk((smu)) : 0)
 #define smu_get_power_limit(smu) \
 	((smu)->funcs->get_power_limit? (smu)->funcs->get_power_limit((smu)) : 0)
+#define smu_get_current_clk_freq(smu, clk_id, value) \
+	((smu)->funcs->get_current_clk_freq? (smu)->funcs->get_current_clk_freq((smu), (clk_id), (value)) : 0)
 
 #define smu_msg_get_index(smu, msg) \
 	((smu)->ppt_funcs? ((smu)->ppt_funcs->get_smu_msg_index? (smu)->ppt_funcs->get_smu_msg_index((smu), (msg)) : -EINVAL) : -EINVAL)

drivers/gpu/drm/amd/powerplay/smu_v11_0.c

@@ -757,6 +757,29 @@ static int smu_v11_0_get_power_limit(struct smu_context *smu)
 	return 0;
 }
 
+static int smu_v11_0_get_current_clk_freq(struct smu_context *smu, uint32_t clk_id, uint32_t *value)
+{
+	int ret = 0;
+	uint32_t freq;
+
+	if (clk_id >= PPCLK_COUNT || !value)
+		return -EINVAL;
+
+	ret = smu_send_smc_msg_with_param(smu,
+			SMU_MSG_GetDpmClockFreq, (clk_id << 16));
+	if (ret)
+		return ret;
+
+	ret = smu_read_smc_arg(smu, &freq);
+	if (ret)
+		return ret;
+
+	freq *= 100;
+	*value = freq;
+
+	return ret;
+}
+
 static const struct smu_funcs smu_v11_0_funcs = {
 	.init_microcode = smu_v11_0_init_microcode,
 	.load_microcode = smu_v11_0_load_microcode,
@@ -786,6 +809,7 @@ static const struct smu_funcs smu_v11_0_funcs = {
 	.disable_all_mask = smu_v11_0_disable_all_mask,
 	.notify_display_change = smu_v11_0_notify_display_change,
 	.get_power_limit = smu_v11_0_get_power_limit,
+	.get_current_clk_freq = smu_v11_0_get_current_clk_freq,
 };
 
 void smu_v11_0_set_smu_funcs(struct smu_context *smu)