wifi: iwlwifi: implement product reset for TOP errors

The TOP is a shared (between BT and WiFi) hardware component,
and if it has an error we need to reset the whole device, i.e.
both BT and WiFi. This is achieved by calling a specific ACPI
DSM (device-specific method) with the right arguments before
doing a reset via the object referenced by _PRR.

Since this is needed here, but a function reset will always do
better than just re-enumerating the bus in case of errors, we
can always try to at least do a function reset and do the full
product reset only when needed for TOP errors.

Also, for some Bz and Sc devices where BT is PCIe/IOSF as well,
find the BT device and unbind that device as well so the BT
driver can recover from the reset that's going to happen,
rather than having to somehow detect that the device was reset.

Also add - currently unused - the function reset mode, this is
going to get used in the upcoming escalation model.

Signed-off-by: Johannes Berg <[email protected]>
Signed-off-by: Miri Korenblit <[email protected]>
Link: https://patch.msgid.link/20241231135726.5b0f846d3e13.Ia14ccac38ac3d48adf5f341b17c7e34ccc41c065@changeid
Signed-off-by: Johannes Berg <[email protected]>

1 files changed, 3 insertions, 3 deletions

diff --git a/drivers/net/wireless/intel/iwlwifi/fw/acpi.c b/drivers/net/wireless/intel/iwlwifi/fw/acpi.c
index b32d5141dbbe..747b18ebbd66 100644
--- a/drivers/net/wireless/intel/iwlwifi/fw/acpi.c
+++ b/drivers/net/wireless/intel/iwlwifi/fw/acpi.c
@@ -79,9 +79,9 @@ static void *iwl_acpi_get_object(struct device *dev, acpi_string method)
  * method (DSM) interface. The returned acpi object must be freed by calling
  * function.
  */
-static void *iwl_acpi_get_dsm_object(struct device *dev, int rev, int func,
-				     union acpi_object *args,
-				     const guid_t *guid)
+union acpi_object *iwl_acpi_get_dsm_object(struct device *dev, int rev,
+					   int func, union acpi_object *args,
+					   const guid_t *guid)
 {
 	union acpi_object *obj;