wifi: iwlwifi: prepare for reading SPLC from UEFI

As the iwl_bios_get_x() functions are now generated using a macro,
and this macro requires the all iwl_acpi_get_x() to have the same
prototype, change iwl_acpi_get_pwr_limit() to return a int
and the actuall power limit will be filled in a pointer function
parameter.
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
Reviewed-by: Gregory Greenman <gregory.greenman@intel.com>
Link: https://msgid.link/20240201155157.4cce81198afe.Ice8b1b97a68da9ec7b5a4799ddb668642198e1af@changeidSigned-off-by: Johannes Berg <johannes.berg@intel.com>

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

@@ -362,31 +362,28 @@ int iwl_acpi_get_mcc(struct device *dev, char *mcc)
 }
 IWL_EXPORT_SYMBOL(iwl_acpi_get_mcc);
 
-u64 iwl_acpi_get_pwr_limit(struct device *dev)
+int iwl_acpi_get_pwr_limit(struct iwl_fw_runtime *fwrt, u64 *dflt_pwr_limit)
 {
 	union acpi_object *data, *wifi_pkg;
-	u64 dflt_pwr_limit;
-	int tbl_rev;
+	int tbl_rev, ret = -EINVAL;
 
-	data = iwl_acpi_get_object(dev, ACPI_SPLC_METHOD);
-	if (IS_ERR(data)) {
-		dflt_pwr_limit = 0;
+	*dflt_pwr_limit = 0;
+	data = iwl_acpi_get_object(fwrt->dev, ACPI_SPLC_METHOD);
+	if (IS_ERR(data))
 		goto out;
-	}
 
-	wifi_pkg = iwl_acpi_get_wifi_pkg(dev, data,
+	wifi_pkg = iwl_acpi_get_wifi_pkg(fwrt->dev, data,
 					 ACPI_SPLC_WIFI_DATA_SIZE, &tbl_rev);
 	if (IS_ERR(wifi_pkg) || tbl_rev != 0 ||
-	    wifi_pkg->package.elements[1].integer.value != ACPI_TYPE_INTEGER) {
-		dflt_pwr_limit = 0;
+	    wifi_pkg->package.elements[1].integer.value != ACPI_TYPE_INTEGER)
 		goto out_free;
-	}
 
-	dflt_pwr_limit = wifi_pkg->package.elements[1].integer.value;
+	*dflt_pwr_limit = wifi_pkg->package.elements[1].integer.value;
+	ret = 0;
 out_free:
 	kfree(data);
 out:
-	return dflt_pwr_limit;
+	return ret;
 }
 IWL_EXPORT_SYMBOL(iwl_acpi_get_pwr_limit);
 

drivers/net/wireless/intel/iwlwifi/fw/acpi.h

@@ -156,7 +156,7 @@ int iwl_acpi_get_dsm_u32(struct device *dev, int rev, int func,
  */
 int iwl_acpi_get_mcc(struct device *dev, char *mcc);
 
-u64 iwl_acpi_get_pwr_limit(struct device *dev);
+int iwl_acpi_get_pwr_limit(struct iwl_fw_runtime *fwrt, u64 *dflt_pwr_limit);
 
 /*
  * iwl_acpi_get_eckv - read external clock validation from ACPI, if available
@@ -212,8 +212,10 @@ static inline int iwl_acpi_get_mcc(struct device *dev, char *mcc)
 	return -ENOENT;
 }
 
-static inline u64 iwl_acpi_get_pwr_limit(struct device *dev)
+static inline int iwl_acpi_get_pwr_limit(struct iwl_fw_runtime *fwrt,
+					 u64 *dflt_pwr_limit)
 {
+	*dflt_pwr_limit = 0;
 	return 0;
 }
 

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

@@ -689,7 +689,7 @@ static u32 iwl_mvm_min_backoff(struct iwl_mvm *mvm)
 	if (!backoff)
 		return 0;
 
-	dflt_pwr_limit = iwl_acpi_get_pwr_limit(mvm->dev);
+	iwl_acpi_get_pwr_limit(&mvm->fwrt, &dflt_pwr_limit);
 
 	while (backoff->pwr) {
 		if (dflt_pwr_limit >= backoff->pwr)