drm/amd/powerplay: add function to get power limit for smu11 (v2)

Add smu_v11_0_get_power_limit function to get power limit vaule.

v2: update "set" to "get", it only implements "get" behavior. (Alex)
Signed-off-by: Likun Gao <Likun.Gao@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/amdgpu_smu.c

@@ -397,6 +397,10 @@ static int smu_smc_table_hw_init(struct smu_context *smu)
 	if (ret)
 		return ret;
 
+	ret = smu_get_power_limit(smu);
+	if (ret)
+		return ret;
+
 	/*
 	 * Set PMSTATUSLOG table bo address with SetToolsDramAddr MSG for tools.
 	 */

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

@@ -201,6 +201,9 @@ struct smu_context
 
 	uint32_t pstate_sclk;
 	uint32_t pstate_mclk;
+
+	uint32_t power_limit;
+	uint32_t default_power_limit;
 };
 
 struct pptable_funcs {
@@ -247,7 +250,7 @@ struct smu_funcs
 	int (*enable_all_mask)(struct smu_context *smu);
 	int (*disable_all_mask)(struct smu_context *smu);
 	int (*notify_display_change)(struct smu_context *smu);
-
+	int (*get_power_limit)(struct smu_context *smu);
 };
 
 #define smu_init_microcode(smu) \
@@ -322,6 +325,8 @@ struct smu_funcs
 	((smu)->ppt_funcs->set_default_dpm_table ? (smu)->ppt_funcs->set_default_dpm_table((smu)) : 0)
 #define smu_populate_umd_state_clk(smu) \
 	((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_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

@@ -738,6 +738,25 @@ static int smu_v11_0_notify_display_change(struct smu_context *smu)
 	return ret;
 }
 
+static int smu_v11_0_get_power_limit(struct smu_context *smu)
+{
+	int ret;
+	uint32_t power_limit_value;
+
+	ret = smu_send_smc_msg_with_param(smu,
+			SMU_MSG_GetPptLimit,
+			POWER_SOURCE_AC << 16);
+	if (ret) {
+		pr_err("[GetPptLimit] get default PPT limit failed!");
+		return ret;
+	}
+
+	smu_read_smc_arg(smu, &power_limit_value);
+	smu->power_limit = smu->default_power_limit = power_limit_value;
+
+	return 0;
+}
+
 static const struct smu_funcs smu_v11_0_funcs = {
 	.init_microcode = smu_v11_0_init_microcode,
 	.load_microcode = smu_v11_0_load_microcode,
@@ -766,6 +785,7 @@ static const struct smu_funcs smu_v11_0_funcs = {
 	.enable_all_mask = smu_v11_0_enable_all_mask,
 	.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,
 };
 
 void smu_v11_0_set_smu_funcs(struct smu_context *smu)