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net: phy: air_an8801: ensure maximum available speed link use

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To ensure that the Airoha AN8801R PHY uses the maximum available link
speed, an additional register write is needed to configure the function
mode for either 1G or 100M/10M operation after link detection.

So, in air_an8801 driver, implement a custom read_status callback, that
after genphy_read_status determines the link speed, sets the bit 0 of
the link mode register (REG_LINK_MODE) if the detected speed is 1Gbps,
or unsets it otherwise.

Signed-off-by: Louis-Alexis Eyraud <louisalexis.eyraud@collabora.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://patch.msgid.link/20260526-add-airoha-an8801-support-v5-6-01aea8dee69b@collabora.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Louis-Alexis Eyraud 2026-05-26 16:58:11 +02:00 committed by Jakub Kicinski
parent fdb9bf7f16
commit f6465e3635
1 changed files with 36 additions and 0 deletions
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36
drivers/net/phy/air_an8801.c
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@ -996,6 +996,41 @@ static int an8801r_config_init(struct phy_device *phydev)
return 0;
}
static int an8801r_read_status(struct phy_device *phydev)
{
int prev_speed, ret;
u32 val;
prev_speed = phydev->speed;
ret = genphy_read_status(phydev);
if (ret)
return ret;
if (!phydev->link) {
phydev->speed = SPEED_UNKNOWN;
return 0;
}
if (prev_speed != phydev->speed) {
/* Ensure that PHY switches to 1G speed when available,
* by configuring the function mode for either 1G or 100M/10M
* operation.
* Therefore, set the link mode register, after read_status
* determines the link speed.
*/
val = phydev->speed == SPEED_1000 ?
AN8801_BPBUS_LINK_MODE_1000 : 0;
return an8801_buckpbus_reg_rmw(phydev,
AN8801_BPBUS_REG_LINK_MODE,
AN8801_BPBUS_LINK_MODE_1000,
val);
}
return 0;
}
static int an8801r_probe(struct phy_device *phydev)
{
struct device *dev = &phydev->mdio.dev;
@ -1093,6 +1128,7 @@ static struct phy_driver airoha_driver[] = {
.suspend = an8801r_suspend,
.resume = an8801r_resume,
.config_aneg = genphy_config_aneg,
.read_status = an8801r_read_status,
.config_intr = an8801r_config_intr,
.handle_interrupt = an8801r_handle_interrupt,
.set_wol = an8801r_set_wol,