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iwlwifi: pcie: prepare the device before accessing it 

For 8000 series, we need to access the device to know what
firmware to load. Before we do so, we need to prepare the
device otherwise we might not be able to access the
hardware.

Fixes: c278754a21e6 ("iwlwifi: mvm: support family 8000 B2/C steps")
CC: <stable@vger.kernel.org> [4.1]
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
This commit is contained in:
Emmanuel Grumbach 2015-06-04 11:09:47 +03:00
parent af3f2f7401
commit f9e5554cd8
1 changed files with 6 additions and 0 deletions
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6
drivers/net/wireless/iwlwifi/pcie/trans.c
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@ -2551,6 +2551,12 @@ struct iwl_trans *iwl_trans_pcie_alloc(struct pci_dev *pdev,
trans->hw_rev = (trans->hw_rev & 0xfff0) |
(CSR_HW_REV_STEP(trans->hw_rev << 2) << 2);
ret = iwl_pcie_prepare_card_hw(trans);
if (ret) {
IWL_WARN(trans, "Exit HW not ready\n");
goto out_pci_disable_msi;
}
/*
* in-order to recognize C step driver should read chip version
* id located at the AUX bus MISC address space.