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Date: Mon, 5 Dec 2016 17:30:25 -0500 From: Vivien Didelot <vivien.didelot@...oirfairelinux.com> To: netdev@...r.kernel.org Cc: linux-kernel@...r.kernel.org, kernel@...oirfairelinux.com, "David S. Miller" <davem@...emloft.net>, Florian Fainelli <f.fainelli@...il.com>, Andrew Lunn <andrew@...n.ch>, Stefan Eichenberger <eichest@...il.com>, Richard Cochran <richardcochran@...il.com>, Vivien Didelot <vivien.didelot@...oirfairelinux.com> Subject: [PATCH v3 net-next v3 1/4] net: dsa: mv88e6xxx: add helper to disable ports Before resetting a switch, the ports should be set to the Disabled state and the transmit queues should be drained. Add an helper to explicit that. Signed-off-by: Vivien Didelot <vivien.didelot@...oirfairelinux.com> Reviewed-by: Andrew Lunn <andrew@...n.ch> --- drivers/net/dsa/mv88e6xxx/chip.c | 34 +++++++++++++++++++++++----------- 1 file changed, 23 insertions(+), 11 deletions(-) diff --git a/drivers/net/dsa/mv88e6xxx/chip.c b/drivers/net/dsa/mv88e6xxx/chip.c index ca453f3..1d4d3be 100644 --- a/drivers/net/dsa/mv88e6xxx/chip.c +++ b/drivers/net/dsa/mv88e6xxx/chip.c @@ -2356,6 +2356,26 @@ static void mv88e6xxx_port_bridge_leave(struct dsa_switch *ds, int port) mutex_unlock(&chip->reg_lock); } +static int mv88e6xxx_disable_ports(struct mv88e6xxx_chip *chip) +{ + int i, err; + + /* Set all ports to the Disabled state */ + for (i = 0; i < mv88e6xxx_num_ports(chip); i++) { + err = mv88e6xxx_port_set_state(chip, i, + PORT_CONTROL_STATE_DISABLED); + if (err) + return err; + } + + /* Wait for transmit queues to drain, + * i.e. 2ms for a maximum frame to be transmitted at 10 Mbps. + */ + usleep_range(2000, 4000); + + return 0; +} + static int mv88e6xxx_switch_reset(struct mv88e6xxx_chip *chip) { bool ppu_active = mv88e6xxx_has(chip, MV88E6XXX_FLAG_PPU_ACTIVE); @@ -2364,18 +2384,10 @@ static int mv88e6xxx_switch_reset(struct mv88e6xxx_chip *chip) unsigned long timeout; u16 reg; int err; - int i; - /* Set all ports to the disabled state. */ - for (i = 0; i < mv88e6xxx_num_ports(chip); i++) { - err = mv88e6xxx_port_set_state(chip, i, - PORT_CONTROL_STATE_DISABLED); - if (err) - return err; - } - - /* Wait for transmit queues to drain. */ - usleep_range(2000, 4000); + err = mv88e6xxx_disable_ports(chip); + if (err) + return err; /* If there is a gpio connected to the reset pin, toggle it */ if (gpiod) { -- 2.10.2
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