wifi: iwlwifi: rfi: use a single DSM function for all RFI configurations

RFI configuration moved from internal guid to the wifi guid, DSM
function 11. Update reading RFI configuration from BIOS.
Signed-off-by: Anjaneyulu <pagadala.yesu.anjaneyulu@intel.com>
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
Reviewed-by: Gregory Greenman <gregory.greenman@intel.com>
Link: https://msgid.link/20240201155157.f4e62435310d.I4f9b6860dd8e3c7ae1f816be5ff8b5967eee266f@changeidSigned-off-by: Johannes Berg <johannes.berg@intel.com>

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

@@ -14,11 +14,6 @@ const guid_t iwl_guid = GUID_INIT(0xF21202BF, 0x8F78, 0x4DC6,
 				  0x8E, 0x28, 0x5A, 0xDE);
 IWL_EXPORT_SYMBOL(iwl_guid);
 
-const guid_t iwl_rfi_guid = GUID_INIT(0x7266172C, 0x220B, 0x4B29,
-				      0x81, 0x4F, 0x75, 0xE4,
-				      0xDD, 0x26, 0xB5, 0xFD);
-IWL_EXPORT_SYMBOL(iwl_rfi_guid);
-
 static int iwl_acpi_get_handle(struct device *dev, acpi_string method,
 			       acpi_handle *ret_handle)
 {

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

@@ -103,6 +103,7 @@ enum iwl_dsm_funcs_rev_0 {
 	DSM_FUNC_ACTIVATE_CHANNEL = 8,
 	DSM_FUNC_FORCE_DISABLE_CHANNELS = 9,
 	DSM_FUNC_ENERGY_DETECTION_THRESHOLD = 10,
+	DSM_FUNC_RFI_CONFIG = 11
 };
 
 enum iwl_dsm_values_srd {
@@ -119,16 +120,14 @@ enum iwl_dsm_values_indonesia {
 	DSM_VALUE_INDONESIA_MAX
 };
 
-/* DSM RFI uses a different GUID, so need separate definitions */
-
-#define DSM_RFI_FUNC_ENABLE 3
-
 enum iwl_dsm_values_rfi {
-	DSM_VALUE_RFI_ENABLE,
-	DSM_VALUE_RFI_DISABLE,
-	DSM_VALUE_RFI_MAX
+	DSM_VALUE_RFI_DLVR_DISABLE	= BIT(0),
+	DSM_VALUE_RFI_DDR_DISABLE	= BIT(1),
 };
 
+#define DSM_VALUE_RFI_DISABLE	(DSM_VALUE_RFI_DLVR_DISABLE |\
+				 DSM_VALUE_RFI_DDR_DISABLE)
+
 enum iwl_dsm_masks_reg {
 	DSM_MASK_CHINA_22_REG = BIT(2)
 };
@@ -138,7 +137,6 @@ enum iwl_dsm_masks_reg {
 struct iwl_fw_runtime;
 
 extern const guid_t iwl_guid;
-extern const guid_t iwl_rfi_guid;
 
 int iwl_acpi_get_dsm_u8(struct device *dev, int rev, int func,
 			const guid_t *guid, u8 *value);

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

@@ -1203,28 +1203,37 @@ static void iwl_mvm_tas_init(struct iwl_mvm *mvm)
 
 #ifdef CONFIG_ACPI
 
-static u8 iwl_mvm_eval_dsm_rfi(struct iwl_mvm *mvm)
+static bool iwl_mvm_eval_dsm_rfi(struct iwl_mvm *mvm)
 {
-	u8 value;
-	int ret = iwl_acpi_get_dsm_u8(mvm->fwrt.dev, 0, DSM_RFI_FUNC_ENABLE,
-				      &iwl_rfi_guid, &value);
+	u8 value = 0;
+	/* default behaviour is disabled */
+	bool bios_enable_rfi = false;
+	int ret  = iwl_acpi_get_dsm_u8(mvm->fwrt.dev, 0,
+				       DSM_FUNC_RFI_CONFIG, &iwl_guid,
+				       &value);
 
 	if (ret < 0) {
 		IWL_DEBUG_RADIO(mvm, "Failed to get DSM RFI, ret=%d\n", ret);
+		return bios_enable_rfi;
+	}
 
-	} else if (value >= DSM_VALUE_RFI_MAX) {
-		IWL_DEBUG_RADIO(mvm, "DSM RFI got invalid value, ret=%d\n",
-				value);
-
-	} else if (value == DSM_VALUE_RFI_ENABLE) {
+	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(mvm, "DSM RFI is evaluated to enable\n");
-		return DSM_VALUE_RFI_ENABLE;
+		bios_enable_rfi = true;
+	} else if (value == DSM_VALUE_RFI_DISABLE) {
+		IWL_DEBUG_RADIO(mvm, "DSM RFI is evaluated to disable\n");
+	} else {
+		IWL_DEBUG_RADIO(mvm,
+				"DSM RFI got invalid value, value=%d\n", value);
 	}
 
-	IWL_DEBUG_RADIO(mvm, "DSM RFI is disabled\n");
-
-	/* default behaviour is disabled */
-	return DSM_VALUE_RFI_DISABLE;
+	return bios_enable_rfi;
 }
 
 static void iwl_mvm_lari_cfg(struct iwl_mvm *mvm)
@@ -1347,9 +1356,9 @@ static void iwl_mvm_lari_cfg(struct iwl_mvm *mvm)
 {
 }
 
-static u8 iwl_mvm_eval_dsm_rfi(struct iwl_mvm *mvm)
+static bool iwl_mvm_eval_dsm_rfi(struct iwl_mvm *mvm)
 {
-	return DSM_VALUE_RFI_DISABLE;
+	return false;
 }
 
 #endif /* CONFIG_ACPI */
@@ -1727,7 +1736,7 @@ int iwl_mvm_up(struct iwl_mvm *mvm)
 	iwl_mvm_uats_init(mvm);
 
 	if (iwl_rfi_supported(mvm)) {
-		if (iwl_mvm_eval_dsm_rfi(mvm) == DSM_VALUE_RFI_ENABLE)
+		if (iwl_mvm_eval_dsm_rfi(mvm))
 			iwl_rfi_send_config_cmd(mvm, NULL);
 	}