diff options
| author | Tobias Waldekranz <tobias@waldekranz.com> | 2022-01-28 17:26:50 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2022-01-31 11:29:12 +0000 |
| commit | 7bca16b22e6a126f66f7d8d551be10815ba46fdb (patch) | |
| tree | ce7222aed80d444ba6a7059e66d67842b69fb47d /drivers/net/dsa/mv88e6xxx/chip.h | |
| parent | 35da1dfd94847c5f1ac04ce5b5002b888c3f36ec (diff) | |
net: dsa: mv88e6xxx: Improve indirect addressing performance
Before this change, both the read and write callback would start out
by asserting that the chip's busy flag was cleared. However, both
callbacks also made sure to wait for the clearing of the busy bit
before returning - making the initial check superfluous. The only
time that would ever have an effect was if the busy bit was initially
set for some reason.
With that in mind, make sure to perform an initial check of the busy
bit, after which both read and write can rely the previous operation
to have waited for the bit to clear.
This cuts the number of operations on the underlying MDIO bus by 25%
Signed-off-by: Tobias Waldekranz <tobias@waldekranz.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/dsa/mv88e6xxx/chip.h')
| -rw-r--r-- | drivers/net/dsa/mv88e6xxx/chip.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/net/dsa/mv88e6xxx/chip.h b/drivers/net/dsa/mv88e6xxx/chip.h index 8271b8aa7b71..438cee853d07 100644 --- a/drivers/net/dsa/mv88e6xxx/chip.h +++ b/drivers/net/dsa/mv88e6xxx/chip.h @@ -392,6 +392,7 @@ struct mv88e6xxx_chip { struct mv88e6xxx_bus_ops { int (*read)(struct mv88e6xxx_chip *chip, int addr, int reg, u16 *val); int (*write)(struct mv88e6xxx_chip *chip, int addr, int reg, u16 val); + int (*init)(struct mv88e6xxx_chip *chip); }; struct mv88e6xxx_mdio_bus { |