Commit 2fd8aaae authored Oct 17, 2021 by Johannes Berg Committed by Luca Coelho Oct 22, 2021

iwlwifi: pcie: try to grab NIC access early



Sometimes some NICs may fail to initialize, but if we have
such a scenario we may only see an alive timeout (i.e. the
firmware doesn't send us the alive message), and that will
only cause us to fail the interface up.

Try to once grab NIC access during device probe to ensure
we can properly talk to the hardware at all, and to do all
the potential workarounds in that function.

Since we now finish NIC init here, we can remove it from
the later potential read of the RF ID.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Link: https://lore.kernel.org/r/iwlwifi.20211017165728.604dfc8f43bd.I07b58a5c9238f75413a91198452ba1268ee79425@changeid


Signed-off-by: Luca Coelho <luciano.coelho@intel.com>

parent 75da590f

drivers/net/wireless/intel/iwlwifi/pcie/drv.c

+18 −0

Original line number	Diff line number	Diff line
		@@ -1322,6 +1322,24 @@ static int iwl_pci_probe(struct pci_dev pdev, const struct pci_device_id ent)

		trans_pcie = IWL_TRANS_GET_PCIE_TRANS(iwl_trans);

		/*
		* Let's try to grab NIC access early here. Sometimes, NICs may
		* fail to initialize, and if that happens it's better if we see
		* issues early on (and can reprobe, per the logic inside), than
		* first trying to load the firmware etc. and potentially only
		* detecting any problems when the first interface is brought up.
		*/
		ret = iwl_finish_nic_init(iwl_trans);
		if (ret)
		goto out_free_trans;
		if (iwl_trans_grab_nic_access(iwl_trans)) {
		/* all good */
		iwl_trans_release_nic_access(iwl_trans);
		} else {
		ret = -EIO;
		goto out_free_trans;
		}

		iwl_trans->hw_rf_id = iwl_read32(iwl_trans, CSR_HW_RF_ID);

		/*