Messages in this thread Patch in this message | | | From | Oleksij Rempel <> | Subject | [PATCH net-next v1 3/3] net: dsa: microchip: Fix PHY loopback configuration for KSZ8794 and KSZ8873 | Date | Tue, 21 Nov 2023 16:24:26 +0100 |
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Correct the PHY loopback bit handling in the ksz8_w_phy_bmcr and ksz8_r_phy_bmcr functions for KSZ8794 and KSZ8873 variants in the ksz8795 driver. Previously, the code erroneously used Bit 7 of port register 0xD for both chip variants, which is actually for LED configuration. This update ensures the correct registers and bits are used for the PHY loopback feature:
- For KSZ8794: Use 0xF / Bit 7. - For KSZ8873: Use 0xD / Bit 0.
Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de> --- drivers/net/dsa/microchip/ksz8795.c | 39 +++++++++++++++++++------ drivers/net/dsa/microchip/ksz8795_reg.h | 1 + 2 files changed, 31 insertions(+), 9 deletions(-)
diff --git a/drivers/net/dsa/microchip/ksz8795.c b/drivers/net/dsa/microchip/ksz8795.c index 4c1e21fd87da..5b223d472548 100644 --- a/drivers/net/dsa/microchip/ksz8795.c +++ b/drivers/net/dsa/microchip/ksz8795.c @@ -731,16 +731,25 @@ static int ksz8_r_phy_bmcr(struct ksz_device *dev, int port, u16 *val) if (ret) return ret; - if (restart & PORT_PHY_LOOPBACK) - *val |= BMCR_LOOPBACK; - if (ctrl & PORT_FORCE_100_MBIT) *val |= BMCR_SPEED100; if (ksz_is_ksz88x3(dev)) { + if (restart & KSZ8873_PORT_PHY_LOOPBACK) + *val |= BMCR_LOOPBACK; + if ((ctrl & PORT_AUTO_NEG_ENABLE)) *val |= BMCR_ANENABLE; } else { + u8 stat3; + + ret = ksz_pread8(dev, port, REG_PORT_STATUS_3, &stat3); + if (ret) + return ret; + + if (stat3 & PORT_PHY_LOOPBACK) + *val |= BMCR_LOOPBACK; + if (!(ctrl & PORT_AUTO_NEG_DISABLE)) *val |= BMCR_ANENABLE; } @@ -994,8 +1003,7 @@ static int ksz8_w_phy_bmcr(struct ksz_device *dev, int port, u16 val) restart = 0; restart_mask = PORT_LED_OFF | PORT_TX_DISABLE | PORT_AUTO_NEG_RESTART | - PORT_POWER_DOWN | PORT_AUTO_MDIX_DISABLE | PORT_FORCE_MDIX | - PORT_PHY_LOOPBACK; + PORT_POWER_DOWN | PORT_AUTO_MDIX_DISABLE | PORT_FORCE_MDIX; if (val & KSZ886X_BMCR_DISABLE_LED) restart |= PORT_LED_OFF; if (val & KSZ886X_BMCR_DISABLE_TRANSMIT) @@ -1008,8 +1016,23 @@ static int ksz8_w_phy_bmcr(struct ksz_device *dev, int port, u16 val) restart |= PORT_AUTO_MDIX_DISABLE; if (val & KSZ886X_BMCR_FORCE_MDI) restart |= PORT_FORCE_MDIX; - if (val & BMCR_LOOPBACK) - restart |= PORT_PHY_LOOPBACK; + + if (ksz_is_ksz88x3(dev)) { + restart_mask |= KSZ8873_PORT_PHY_LOOPBACK; + + if (val & BMCR_LOOPBACK) + restart |= KSZ8873_PORT_PHY_LOOPBACK; + } else { + u8 stat3 = 0; + + if (val & BMCR_LOOPBACK) + stat3 |= PORT_PHY_LOOPBACK; + + ret = ksz_prmw8(dev, port, REG_PORT_STATUS_3, PORT_PHY_LOOPBACK, + stat3); + if (ret) + return ret; + } return ksz_prmw8(dev, port, regs[P_NEG_RESTART_CTRL], restart_mask, restart); @@ -1029,8 +1052,6 @@ int ksz8_w_phy(struct ksz_device *dev, u16 phy, u16 reg, u16 val) ret = ksz8_w_phy_bmcr(dev, p, val); if (ret) return ret; - - break; case MII_ADVERTISE: ret = ksz_pread8(dev, p, regs[P_LOCAL_CTRL], &ctrl); diff --git a/drivers/net/dsa/microchip/ksz8795_reg.h b/drivers/net/dsa/microchip/ksz8795_reg.h index 3c9dae53e4d8..4c07e0e1fcca 100644 --- a/drivers/net/dsa/microchip/ksz8795_reg.h +++ b/drivers/net/dsa/microchip/ksz8795_reg.h @@ -262,6 +262,7 @@ #define PORT_AUTO_MDIX_DISABLE BIT(2) #define PORT_FORCE_MDIX BIT(1) #define PORT_MAC_LOOPBACK BIT(0) +#define KSZ8873_PORT_PHY_LOOPBACK BIT(0) #define REG_PORT_1_STATUS_2 0x1E #define REG_PORT_2_STATUS_2 0x2E -- 2.39.2
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