iwlwifi: update trans->hw_rev 8000 hw family format

The format of the CSR_HW_REV register has changed in 8000
HW family. To keep backwards compatibility, we store the
value of this register as usual in trans->hw_rev, only we
store it in the old format in this variable.

Signed-off-by: Liad Kaufman <liad.kaufman@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>

diff --git a/drivers/net/wireless/iwlwifi/pcie/trans.c b/drivers/net/wireless/iwlwifi/pcie/trans.c
index 0480857..5703a3d 100644 (file)
--- a/drivers/net/wireless/iwlwifi/pcie/trans.c
+++ b/drivers/net/wireless/iwlwifi/pcie/trans.c
@@ -1993,6 +1993,16 @@ struct iwl_trans *iwl_trans_pcie_alloc(struct pci_dev *pdev,
        }
 
        trans->hw_rev = iwl_read32(trans, CSR_HW_REV);
+       /*
+        * In the 8000 HW family the format of the 4 bytes of CSR_HW_REV have
+        * changed, and now the revision step also includes bit 0-1 (no more
+        * "dash" value). To keep hw_rev backwards compatible - we'll store it
+        * in the old format.
+        */
+       if (trans->cfg->device_family == IWL_DEVICE_FAMILY_8000)
+               trans->hw_rev = (trans->hw_rev & 0xfff0) |
+                               ((trans->hw_rev << 2) & 0xc);
+
        trans->hw_id = (pdev->device << 16) + pdev->subsystem_device;
        snprintf(trans->hw_id_str, sizeof(trans->hw_id_str),
                 "PCI ID: 0x%04X:0x%04X", pdev->device, pdev->subsystem_device);