wifi: iwlwifi: implement WPFC ACPI table loading

We skipped this in the past, but now we will need it for some
platforms. Implement loading the PHY filter configuration IDs
from the WPFC ACPI table. Note that the firmware must also be
aware of the right filter configuration IDs (they're just the
IDs of a filter configuration, not the actual configuration).

Remove the useless hardcoded zeroes while at it.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>
Link: https://lore.kernel.org/r/20230614123447.035026ea3169.I3a1fc1fe644fefa0d818ee1926c5fc331d68e8a3@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 37 insertions, 0 deletions

diff --git a/drivers/net/wireless/intel/iwlwifi/fw/acpi.c b/drivers/net/wireless/intel/iwlwifi/fw/acpi.c
index 6345ac454e80..dfe8357036eb 100644
--- a/drivers/net/wireless/intel/iwlwifi/fw/acpi.c
+++ b/drivers/net/wireless/intel/iwlwifi/fw/acpi.c
@@ -1248,3 +1248,40 @@ bool iwl_acpi_is_ppag_approved(struct iwl_fw_runtime *fwrt)
 	return true;
 }
 IWL_EXPORT_SYMBOL(iwl_acpi_is_ppag_approved);
+
+void iwl_acpi_get_phy_filters(struct iwl_fw_runtime *fwrt,
+			      struct iwl_phy_specific_cfg *filters)
+{
+	struct iwl_phy_specific_cfg tmp = {};
+	union acpi_object *wifi_pkg, *data;
+	int tbl_rev, i;
+
+	data = iwl_acpi_get_object(fwrt->dev, ACPI_WPFC_METHOD);
+	if (IS_ERR(data))
+		return;
+
+	/* try to read wtas table revision 1 or revision 0*/
+	wifi_pkg = iwl_acpi_get_wifi_pkg(fwrt->dev, data,
+					 ACPI_WPFC_WIFI_DATA_SIZE,
+					 &tbl_rev);
+	if (IS_ERR(wifi_pkg))
+		goto out_free;
+
+	if (tbl_rev != 0)
+		goto out_free;
+
+	BUILD_BUG_ON(ARRAY_SIZE(filters->filter_cfg_chains) != ACPI_WPFC_WIFI_DATA_SIZE);
+
+	for (i = 0; i < ARRAY_SIZE(filters->filter_cfg_chains); i++) {
+		if (wifi_pkg->package.elements[i].type != ACPI_TYPE_INTEGER)
+			return;
+		tmp.filter_cfg_chains[i] =
+			cpu_to_le32(wifi_pkg->package.elements[i].integer.value);
+	}
+
+	IWL_DEBUG_RADIO(fwrt, "Loaded WPFC filter config from ACPI\n");
+	*filters = tmp;
+out_free:
+	kfree(data);
+}
+IWL_EXPORT_SYMBOL(iwl_acpi_get_phy_filters);