iwlwifi: mvm: spin off SAR profile selection function

For dynamic SAR, we will need to select the current profile from
different places.  In preparation for that, spin the profile selection
code out of iwl_mvm_sar_init().
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>

drivers/net/wireless/intel/iwlwifi/mvm/d3.c

@@ -2116,6 +2116,10 @@ static int __iwl_mvm_resume(struct iwl_mvm *mvm, bool test)
 	 */
 	iwl_mvm_update_changed_regdom(mvm);
 
+	if (!unified_image)
+		/*  Re-configure default SAR profile */
+		iwl_mvm_sar_select_profile(mvm, 1, 1);
+
 	if (mvm->net_detect) {
 		/* If this is a non-unified image, we restart the FW,
 		 * so no need to stop the netdetect scan.  If that

drivers/net/wireless/intel/iwlwifi/mvm/fw.c

@@ -1123,49 +1123,78 @@ static int iwl_mvm_sar_get_wrds_table(struct iwl_mvm *mvm)
 	return ret;
 }
 
-static int iwl_mvm_sar_init(struct iwl_mvm *mvm)
+int iwl_mvm_sar_select_profile(struct iwl_mvm *mvm, int prof_a, int prof_b)
 {
 	struct iwl_dev_tx_power_cmd cmd = {
 		.v3.set_mode = cpu_to_le32(IWL_TX_POWER_MODE_SET_CHAINS),
 	};
-	int ret, i, j, idx;
+	int i, j, idx;
+	int profs[IWL_NUM_CHAIN_LIMITS] = { prof_a, prof_b };
 	int len = sizeof(cmd);
 
+	BUILD_BUG_ON(IWL_NUM_CHAIN_LIMITS < 2);
+	BUILD_BUG_ON(IWL_NUM_CHAIN_LIMITS * IWL_NUM_SUB_BANDS !=
+		     IWL_MVM_SAR_TABLE_SIZE);
+
 	if (!fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_TX_POWER_ACK))
 		len = sizeof(cmd.v3);
 
-	ret = iwl_mvm_sar_get_wrds_table(mvm);
-	if (ret < 0) {
-		IWL_DEBUG_RADIO(mvm,
-				"SAR BIOS table invalid or unavailable. (%d)\n",
-				ret);
-		/* we don't fail if the table is not available */
-		return 0;
-	}
+	for (i = 0; i < IWL_NUM_CHAIN_LIMITS; i++) {
+		struct iwl_mvm_sar_profile *prof;
 
-	/* if profile 0 is disabled, there's nothing else to do here */
-	if (!mvm->sar_profiles[0].enabled)
-		return 0;
+		/* don't allow SAR to be disabled (profile 0 means disable) */
+		if (profs[i] == 0)
+			return -EPERM;
 
-	IWL_DEBUG_RADIO(mvm, "Sending REDUCE_TX_POWER_CMD per chain\n");
+		/* we are off by one, so allow up to IWL_MVM_SAR_PROFILE_NUM */
+		if (profs[i] > IWL_MVM_SAR_PROFILE_NUM)
+			return -EINVAL;
 
-	BUILD_BUG_ON(IWL_NUM_CHAIN_LIMITS * IWL_NUM_SUB_BANDS !=
-		     IWL_MVM_SAR_TABLE_SIZE);
+		/* profiles go from 1 to 4, so decrement to access the array */
+		prof = &mvm->sar_profiles[profs[i] - 1];
+
+		/* if the profile is disabled, do nothing */
+		if (!prof->enabled) {
+			IWL_DEBUG_RADIO(mvm, "SAR profile %d is disabled.\n",
+					profs[i]);
+			/* if one of the profiles is disabled, we fail all */
+			return -ENOENT;
+		}
 
-	for (i = 0; i < IWL_NUM_CHAIN_LIMITS; i++) {
 		IWL_DEBUG_RADIO(mvm, "  Chain[%d]:\n", i);
 		for (j = 0; j < IWL_NUM_SUB_BANDS; j++) {
 			idx = (i * IWL_NUM_SUB_BANDS) + j;
 			cmd.v3.per_chain_restriction[i][j] =
-				cpu_to_le16(mvm->sar_profiles[0].table[idx]);
+				cpu_to_le16(prof->table[idx]);
 			IWL_DEBUG_RADIO(mvm, "    Band[%d] = %d * .125dBm\n",
-					j, mvm->sar_profiles[0].table[idx]);
+					j, prof->table[idx]);
 		}
 	}
 
-	ret = iwl_mvm_send_cmd_pdu(mvm, REDUCE_TX_POWER_CMD, 0, len, &cmd);
-	if (ret)
-		IWL_ERR(mvm, "failed to set per-chain TX power: %d\n", ret);
+	IWL_DEBUG_RADIO(mvm, "Sending REDUCE_TX_POWER_CMD per chain\n");
+
+	return iwl_mvm_send_cmd_pdu(mvm, REDUCE_TX_POWER_CMD, 0, len, &cmd);
+}
+
+static int iwl_mvm_sar_init(struct iwl_mvm *mvm)
+{
+	int ret;
+
+	ret = iwl_mvm_sar_get_wrds_table(mvm);
+	if (ret < 0) {
+		IWL_DEBUG_RADIO(mvm,
+				"SAR BIOS table invalid or unavailable. (%d)\n",
+				ret);
+		/* we don't fail if the table is not available */
+		return 0;
+	}
+
+	/* choose profile 1 (WRDS) as default for both chains */
+	ret = iwl_mvm_sar_select_profile(mvm, 1, 1);
+
+	/* if we don't have profile 0 from BIOS, just skip it */
+	if (ret == -ENOENT)
+		return 0;
 
 	return ret;
 }

drivers/net/wireless/intel/iwlwifi/mvm/mvm.h

@@ -1818,5 +1818,6 @@ int iwl_mvm_send_lqm_cmd(struct ieee80211_vif *vif,
 			 enum iwl_lqm_cmd_operatrions operation,
 			 u32 duration, u32 timeout);
 bool iwl_mvm_lqm_active(struct iwl_mvm *mvm);
+int iwl_mvm_sar_select_profile(struct iwl_mvm *mvm, int prof_a, int prof_b);
 
 #endif /* __IWL_MVM_H__ */