wifi: iwlwifi: mvm: rename and move iwl_mvm_eval_dsm_rfi() to iwl_rfi_is_enabled_in_bios()

Renamed iwl_mvm_eval_dsm_rfi() to iwl_rfi_is_enabled_in_bios() to better
reflect the function's operation. Additionally, moved the function to the
regulatory.c file for better organization. optimize local variable
usage in it.

Signed-off-by: Anjaneyulu <[email protected]>
Reviewed-by: Emmanuel Grumbach <[email protected]>
Signed-off-by: Miri Korenblit <[email protected]>
Link: https://patch.msgid.link/20250205145347.b7ac9d05234e.Ieb623d7e8dca6bb6a5733682b31e4ff1e39373f0@changeid
Signed-off-by: Johannes Berg <[email protected]>

1 files changed, 31 insertions, 0 deletions

diff --git a/drivers/net/wireless/intel/iwlwifi/fw/regulatory.c b/drivers/net/wireless/intel/iwlwifi/fw/regulatory.c
index ea435ee94312..63320689e05d 100644
--- a/drivers/net/wireless/intel/iwlwifi/fw/regulatory.c
+++ b/drivers/net/wireless/intel/iwlwifi/fw/regulatory.c
@@ -674,3 +674,34 @@ bool iwl_puncturing_is_allowed_in_bios(u32 puncturing, u16 mcc)
 	}
 }
 IWL_EXPORT_SYMBOL(iwl_puncturing_is_allowed_in_bios);
+
+bool iwl_rfi_is_enabled_in_bios(struct iwl_fw_runtime *fwrt)
+{
+	/* default behaviour is disabled */
+	u32 value = 0;
+	int ret = iwl_bios_get_dsm(fwrt, DSM_FUNC_RFI_CONFIG, &value);
+
+	if (ret < 0) {
+		IWL_DEBUG_RADIO(fwrt, "Failed to get DSM RFI, ret=%d\n", ret);
+		return false;
+	}
+
+	value &= DSM_VALUE_RFI_DISABLE;
+	/* RFI BIOS CONFIG value can be 0 or 3 only.
+	 * i.e 0 means DDR and DLVR enabled. 3 means DDR and DLVR disabled.
+	 * 1 and 2 are invalid BIOS configurations, So, it's not possible to
+	 * disable ddr/dlvr separately.
+	 */
+	if (!value) {
+		IWL_DEBUG_RADIO(fwrt, "DSM RFI is evaluated to enable\n");
+		return true;
+	} else if (value == DSM_VALUE_RFI_DISABLE) {
+		IWL_DEBUG_RADIO(fwrt, "DSM RFI is evaluated to disable\n");
+	} else {
+		IWL_DEBUG_RADIO(fwrt,
+				"DSM RFI got invalid value, value=%d\n", value);
+	}
+
+	return false;
+}
+IWL_EXPORT_SYMBOL(iwl_rfi_is_enabled_in_bios);