iwlwifi: pcie: wait longer after device reset

The newest devices need a longer time to reset because of
their more complex hardware. Wait 5ms after device reset.
Consolidate all the places that reset the device in the
PCIe transport to avoid future bugs.

While at it, unify the flow to use set_bit instead of full
write as requested by the hardware designers.
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>

drivers/net/wireless/intel/iwlwifi/mvm/utils.c

@@ -526,7 +526,7 @@ static void iwl_mvm_dump_lmac_error_log(struct iwl_mvm *mvm, u32 base)
 
 		/* reset the device */
 		iwl_set_bit(trans, CSR_RESET, CSR_RESET_REG_FLAG_SW_RESET);
-		usleep_range(1000, 2000);
+		usleep_range(5000, 6000);
 
 		/* set INIT_DONE flag */
 		iwl_set_bit(trans, CSR_GP_CNTRL,

drivers/net/wireless/intel/iwlwifi/pcie/internal.h

@@ -654,6 +654,13 @@ static inline void iwl_enable_fw_load_int(struct iwl_trans *trans)
 	}
 }
 
+static inline void iwl_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);
+	usleep_range(5000, 6000);
+}
+
 static inline void *iwl_pcie_get_tfd(struct iwl_trans_pcie *trans_pcie,
 				     struct iwl_txq *txq, int idx)
 {

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

@@ -136,9 +136,7 @@ static void iwl_pcie_gen2_apm_stop(struct iwl_trans *trans, bool op_mode_leave)
 	/* Stop device's DMA activity */
 	iwl_pcie_apm_stop_master(trans);
 
-	/* Reset the entire device */
-	iwl_set_bit(trans, CSR_RESET, CSR_RESET_REG_FLAG_SW_RESET);
-	usleep_range(1000, 2000);
+	iwl_pcie_sw_reset(trans);
 
 	/*
 	 * Clear "initialization complete" bit to move adapter from
@@ -188,9 +186,7 @@ void _iwl_trans_pcie_gen2_stop_device(struct iwl_trans *trans, bool low_power)
 	/* Stop the device, and put it in low power state */
 	iwl_pcie_gen2_apm_stop(trans, false);
 
-	/* stop and reset the on-board processor */
-	iwl_write32(trans, CSR_RESET, CSR_RESET_REG_FLAG_SW_RESET);
-	usleep_range(1000, 2000);
+	iwl_pcie_sw_reset(trans);
 
 	/*
 	 * Upon stop, the IVAR table gets erased, so msi-x won't

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

@@ -358,9 +358,7 @@ static void iwl_pcie_apm_lp_xtal_enable(struct iwl_trans *trans)
 	__iwl_trans_pcie_set_bit(trans, CSR_GP_CNTRL,
 				 CSR_GP_CNTRL_REG_FLAG_XTAL_ON);
 
-	/* Reset entire device - do controller reset (results in SHRD_HW_RST) */
-	iwl_set_bit(trans, CSR_RESET, CSR_RESET_REG_FLAG_SW_RESET);
-	usleep_range(1000, 2000);
+	iwl_pcie_sw_reset(trans);
 
 	/*
 	 * Set "initialization complete" bit to move adapter from
@@ -401,12 +399,7 @@ static void iwl_pcie_apm_lp_xtal_enable(struct iwl_trans *trans)
 				 apmg_xtal_cfg_reg |
 				 SHR_APMG_XTAL_CFG_XTAL_ON_REQ);
 
-	/*
-	 * Reset entire device again - do controller reset (results in
-	 * SHRD_HW_RST). Turn MAC off before proceeding.
-	 */
-	iwl_set_bit(trans, CSR_RESET, CSR_RESET_REG_FLAG_SW_RESET);
-	usleep_range(1000, 2000);
+	iwl_pcie_sw_reset(trans);
 
 	/* Enable LP XTAL by indirect access through CSR */
 	apmg_gp1_reg = iwl_trans_pcie_read_shr(trans, SHR_APMG_GP1_REG);
@@ -499,9 +492,7 @@ static void iwl_pcie_apm_stop(struct iwl_trans *trans, bool op_mode_leave)
 		return;
 	}
 
-	/* Reset the entire device */
-	iwl_set_bit(trans, CSR_RESET, CSR_RESET_REG_FLAG_SW_RESET);
-	usleep_range(1000, 2000);
+	iwl_pcie_sw_reset(trans);
 
 	/*
 	 * Clear "initialization complete" bit to move adapter from
@@ -1181,9 +1172,7 @@ static void _iwl_trans_pcie_stop_device(struct iwl_trans *trans, bool low_power)
 	/* Stop the device, and put it in low power state */
 	iwl_pcie_apm_stop(trans, false);
 
-	/* stop and reset the on-board processor */
-	iwl_write32(trans, CSR_RESET, CSR_RESET_REG_FLAG_SW_RESET);
-	usleep_range(1000, 2000);
+	iwl_pcie_sw_reset(trans);
 
 	/*
 	 * Upon stop, the IVAR table gets erased, so msi-x won't
@@ -1657,9 +1646,7 @@ static int _iwl_trans_pcie_start_hw(struct iwl_trans *trans, bool low_power)
 		return err;
 	}
 
-	/* Reset the entire device */
-	iwl_write32(trans, CSR_RESET, CSR_RESET_REG_FLAG_SW_RESET);
-	usleep_range(1000, 2000);
+	iwl_pcie_sw_reset(trans);
 
 	err = iwl_pcie_apm_init(trans);
 	if (err)