drm/amd/pm: Add xgmi plpd to arcturus pm_policy

On arcturus, allow changing xgmi plpd policy through
'pm_policy/xgmi_plpd' sysfs interface.
Signed-off-by: Lijo Lazar <lijo.lazar@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Reviewed-by: Asad Kamal <asad.kamal@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -1199,19 +1199,20 @@ static void smu_init_xgmi_plpd_mode(struct smu_context *smu)
 {
 	struct smu_dpm_context *dpm_ctxt = &(smu->smu_dpm);
 	struct smu_dpm_policy_ctxt *policy_ctxt;
+	struct smu_dpm_policy *policy;
 
+	policy = smu_get_pm_policy(smu, PP_PM_POLICY_XGMI_PLPD);
 	if (amdgpu_ip_version(smu->adev, MP1_HWIP, 0) == IP_VERSION(11, 0, 2)) {
 		smu->plpd_mode = XGMI_PLPD_DEFAULT;
+		if (policy)
+			policy->current_level = XGMI_PLPD_DEFAULT;
 		return;
 	}
 
 	/* PMFW put PLPD into default policy after enabling the feature */
 	if (smu_feature_is_enabled(smu,
 				   SMU_FEATURE_XGMI_PER_LINK_PWR_DWN_BIT)) {
-		struct smu_dpm_policy *policy;
-
 		smu->plpd_mode = XGMI_PLPD_DEFAULT;
-		policy = smu_get_pm_policy(smu, PP_PM_POLICY_XGMI_PLPD);
 		if (policy)
 			policy->current_level = XGMI_PLPD_DEFAULT;
 	} else {

drivers/gpu/drm/amd/pm/swsmu/smu11/arcturus_ppt.c

@@ -283,9 +283,29 @@ static int arcturus_tables_init(struct smu_context *smu)
 	return 0;
 }
 
+static int arcturus_select_plpd_policy(struct smu_context *smu, int level)
+{
+	/* PPSMC_MSG_GmiPwrDnControl is supported by 54.23.0 and onwards */
+	if (smu->smc_fw_version < 0x00361700) {
+		dev_err(smu->adev->dev,
+			"XGMI power down control is only supported by PMFW 54.23.0 and onwards\n");
+		return -EINVAL;
+	}
+
+	if (level == XGMI_PLPD_DEFAULT)
+		return smu_cmn_send_smc_msg_with_param(
+			smu, SMU_MSG_GmiPwrDnControl, 1, NULL);
+	else if (level == XGMI_PLPD_DISALLOW)
+		return smu_cmn_send_smc_msg_with_param(
+			smu, SMU_MSG_GmiPwrDnControl, 0, NULL);
+	else
+		return -EINVAL;
+}
+
 static int arcturus_allocate_dpm_context(struct smu_context *smu)
 {
 	struct smu_dpm_context *smu_dpm = &smu->smu_dpm;
+	struct smu_dpm_policy *policy;
 
 	smu_dpm->dpm_context = kzalloc(sizeof(struct smu_11_0_dpm_context),
 				       GFP_KERNEL);
@@ -293,6 +313,20 @@ static int arcturus_allocate_dpm_context(struct smu_context *smu)
 		return -ENOMEM;
 	smu_dpm->dpm_context_size = sizeof(struct smu_11_0_dpm_context);
 
+	smu_dpm->dpm_policies =
+		kzalloc(sizeof(struct smu_dpm_policy_ctxt), GFP_KERNEL);
+
+	if (!smu_dpm->dpm_policies)
+		return -ENOMEM;
+
+	policy = &(smu_dpm->dpm_policies->policies[0]);
+	policy->policy_type = PP_PM_POLICY_XGMI_PLPD;
+	policy->level_mask = BIT(XGMI_PLPD_DISALLOW) | BIT(XGMI_PLPD_DEFAULT);
+	policy->current_level = XGMI_PLPD_DEFAULT;
+	policy->set_policy = arcturus_select_plpd_policy;
+	smu_cmn_generic_plpd_policy_desc(policy);
+	smu_dpm->dpm_policies->policy_mask |= BIT(PP_PM_POLICY_XGMI_PLPD);
+
 	return 0;
 }
 
@@ -403,6 +437,14 @@ static int arcturus_set_default_dpm_table(struct smu_context *smu)
 		dpm_table->max = dpm_table->dpm_levels[0].value;
 	}
 
+	/* XGMI PLPD is supported by 54.23.0 and onwards */
+	if (smu->smc_fw_version < 0x00361700) {
+		struct smu_dpm_context *smu_dpm = &smu->smu_dpm;
+
+		smu_dpm->dpm_policies->policy_mask &=
+			~BIT(PP_PM_POLICY_XGMI_PLPD);
+	}
+
 	return 0;
 }