netdev - [RFC PATCH net-next 09/12] mlxsw: pci: Move software reset code to a separate function

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Date: Tue, 17 Oct 2023 10:42:54 +0300
From: Ido Schimmel <idosch@...dia.com>
To: <netdev@...r.kernel.org>, <linux-pci@...r.kernel.org>
CC: <davem@...emloft.net>, <kuba@...nel.org>, <pabeni@...hat.com>,
	<edumazet@...gle.com>, <bhelgaas@...gle.com>, <alex.williamson@...hat.com>,
	<lukas@...ner.de>, <petrm@...dia.com>, <jiri@...dia.com>, <mlxsw@...dia.com>,
	Amit Cohen <amcohen@...dia.com>, Ido Schimmel <idosch@...dia.com>
Subject: [RFC PATCH net-next 09/12] mlxsw: pci: Move software reset code to a separate function

From: Amit Cohen <amcohen@...dia.com>

In general, the existing flow of software reset in the driver is:
1. Wait for system ready status.
2. Send MRSR command, to start the reset.
3. Wait for system ready status.

This flow will be extended once a new reset command is supported. As a
preparation, move step #2 to a separate function.

Signed-off-by: Amit Cohen <amcohen@...dia.com>
Reviewed-by: Petr Machata <petrm@...dia.com>
Signed-off-by: Ido Schimmel <idosch@...dia.com>
---
 drivers/net/ethernet/mellanox/mlxsw/pci.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/pci.c b/drivers/net/ethernet/mellanox/mlxsw/pci.c
index af47d450332f..1980343ff873 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/pci.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/pci.c
@@ -1464,11 +1464,18 @@ static int mlxsw_pci_sys_ready_wait(struct mlxsw_pci *mlxsw_pci,
 	return -EBUSY;
 }
 
+static int mlxsw_pci_reset_sw(struct mlxsw_pci *mlxsw_pci)
+{
+	char mrsr_pl[MLXSW_REG_MRSR_LEN];
+
+	mlxsw_reg_mrsr_pack(mrsr_pl, MLXSW_REG_MRSR_COMMAND_SOFTWARE_RESET);
+	return mlxsw_reg_write(mlxsw_pci->core, MLXSW_REG(mrsr), mrsr_pl);
+}
+
 static int
 mlxsw_pci_reset(struct mlxsw_pci *mlxsw_pci, const struct pci_device_id *id)
 {
 	struct pci_dev *pdev = mlxsw_pci->pdev;
-	char mrsr_pl[MLXSW_REG_MRSR_LEN];
 	u32 sys_status;
 	int err;
 
@@ -1479,8 +1486,7 @@ mlxsw_pci_reset(struct mlxsw_pci *mlxsw_pci, const struct pci_device_id *id)
 		return err;
 	}
 
-	mlxsw_reg_mrsr_pack(mrsr_pl, MLXSW_REG_MRSR_COMMAND_SOFTWARE_RESET);
-	err = mlxsw_reg_write(mlxsw_pci->core, MLXSW_REG(mrsr), mrsr_pl);
+	err = mlxsw_pci_reset_sw(mlxsw_pci);
 	if (err)
 		return err;
 
-- 
2.40.1