iwlwifi: BZ Family SW reset support

Previously added BZ reset wasn't taking into account the
call to iwl_trans_pcie_sw_reset which used a pre-BZ logic
to reset the device - enabling iwl_trans_pcie_sw_reset to
support BZ family made this reset redundant.

MAC_ACCESS clear shouldn't be called here but only when calling
_iwl_trans_pcie_stop_device which now support also BZ family.

Signed-off-by: Roee Goldfiner <roee.h.goldfiner@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Link: https://lore.kernel.org/r/iwlwifi.20211017162352.648931fe07e2.Ibf30f9b8e70536da93c4a574ace33d325d3f8da4@changeid
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>

drivers/net/wireless/intel/iwlwifi/pcie/trans-gen2.c

@@ -163,18 +163,6 @@ void _iwl_trans_pcie_gen2_stop_device(struct iwl_trans *trans)
 	else
 		iwl_pcie_ctxt_info_free(trans);
 
-	/* Make sure (redundant) we've released our request to stay awake */
-	if (trans->trans_cfg->device_family >= IWL_DEVICE_FAMILY_BZ)
-		iwl_clear_bit(trans, CSR_GP_CNTRL,
-			      CSR_GP_CNTRL_REG_FLAG_BZ_MAC_ACCESS_REQ);
-	else
-		iwl_clear_bit(trans, CSR_GP_CNTRL,
-			      CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
-
-	if (trans->trans_cfg->device_family >= IWL_DEVICE_FAMILY_BZ) {
-		iwl_set_bit(trans, CSR_GP_CNTRL,
-			    CSR_GP_CNTRL_REG_FLAG_SW_RESET);
-	}
 	/* Stop the device, and put it in low power state */
 	iwl_pcie_gen2_apm_stop(trans, false);
 

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

@@ -129,7 +129,12 @@ void iwl_trans_pcie_dump_regs(struct iwl_trans *trans)
 static void iwl_trans_pcie_sw_reset(struct iwl_trans *trans)
 {
 	/* Reset entire device - do controller reset (results in SHRD_HW_RST) */
-	iwl_set_bit(trans, CSR_RESET, CSR_RESET_REG_FLAG_SW_RESET);
+	if (trans->trans_cfg->device_family >= IWL_DEVICE_FAMILY_BZ)
+		iwl_set_bit(trans, CSR_GP_CNTRL,
+			    CSR_GP_CNTRL_REG_FLAG_SW_RESET);
+	else
+		iwl_set_bit(trans, CSR_RESET,
+			    CSR_RESET_REG_FLAG_SW_RESET);
 	usleep_range(5000, 6000);
 }
 
@@ -1209,8 +1214,12 @@ static void _iwl_trans_pcie_stop_device(struct iwl_trans *trans)
 	}
 
 	/* Make sure (redundant) we've released our request to stay awake */
-	iwl_clear_bit(trans, CSR_GP_CNTRL,
-		      CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
+	if (trans->trans_cfg->device_family >= IWL_DEVICE_FAMILY_BZ)
+		iwl_clear_bit(trans, CSR_GP_CNTRL,
+			      CSR_GP_CNTRL_REG_FLAG_BZ_MAC_ACCESS_REQ);
+	else
+		iwl_clear_bit(trans, CSR_GP_CNTRL,
+			      CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
 
 	/* Stop the device, and put it in low power state */
 	iwl_pcie_apm_stop(trans, false);
@@ -2141,9 +2150,12 @@ static void iwl_trans_pcie_release_nic_access(struct iwl_trans *trans)
 
 	if (trans_pcie->cmd_hold_nic_awake)
 		goto out;
-
-	__iwl_trans_pcie_clear_bit(trans, CSR_GP_CNTRL,
-				   CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
+	if (trans->trans_cfg->device_family >= IWL_DEVICE_FAMILY_BZ)
+		__iwl_trans_pcie_clear_bit(trans, CSR_GP_CNTRL,
+					   CSR_GP_CNTRL_REG_FLAG_BZ_MAC_ACCESS_REQ);
+	else
+		__iwl_trans_pcie_clear_bit(trans, CSR_GP_CNTRL,
+					   CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
 	/*
 	 * Above we read the CSR_GP_CNTRL register, which will flush
 	 * any previous writes, but we need the write that clears the