[PATCH net-next] net: phy: micrel: Add config_init for LAN8814

From: Horatiu Vultur
Date: Fri Nov 26 2021 - 05:41:40 EST


Add config_init for LAN8814. This function is required for the following
reasons:
- we need to make sure that the PHY is reset,
- disable ANEG with QSGMII PCS Host side
- swap the MDI-X A,B transmit so that there will not be any link flip-flaps
when the PHY gets a link.

Signed-off-by: Horatiu Vultur <horatiu.vultur@xxxxxxxxxxxxx>
---
drivers/net/phy/micrel.c | 32 ++++++++++++++++++++++++++++++++
1 file changed, 32 insertions(+)

diff --git a/drivers/net/phy/micrel.c b/drivers/net/phy/micrel.c
index 44a24b99c894..f080312032cf 100644
--- a/drivers/net/phy/micrel.c
+++ b/drivers/net/phy/micrel.c
@@ -1565,6 +1565,14 @@ static int ksz886x_cable_test_get_status(struct phy_device *phydev,
#define LAN_EXT_PAGE_ACCESS_ADDRESS_DATA 0x17
#define LAN_EXT_PAGE_ACCESS_CTRL_EP_FUNC 0x4000

+#define LAN8814_QSGMII_SOFT_RESET 0x43
+#define LAN8814_QSGMII_SOFT_RESET_BIT BIT(0)
+#define LAN8814_QSGMII_PCS1G_ANEG_CONFIG 0x13
+#define LAN8814_QSGMII_PCS1G_ANEG_CONFIG_ANEG_ENA BIT(3)
+#define LAN8814_ALIGN_SWAP 0x4a
+#define LAN8814_ALIGN_TX_A_B_SWAP 0x1
+#define LAN8814_ALIGN_TX_A_B_SWAP_MASK GENMASK(2, 0)
+
#define LAN8804_ALIGN_SWAP 0x4a
#define LAN8804_ALIGN_TX_A_B_SWAP 0x1
#define LAN8804_ALIGN_TX_A_B_SWAP_MASK GENMASK(2, 0)
@@ -1601,6 +1609,29 @@ static int lanphy_write_page_reg(struct phy_device *phydev, int page, u16 addr,
return 0;
}

+static int lan8814_config_init(struct phy_device *phydev)
+{
+ int val;
+
+ /* Reset the PHY */
+ val = lanphy_read_page_reg(phydev, 4, LAN8814_QSGMII_SOFT_RESET);
+ val |= LAN8814_QSGMII_SOFT_RESET_BIT;
+ lanphy_write_page_reg(phydev, 4, LAN8814_QSGMII_SOFT_RESET, val);
+
+ /* Disable ANEG with QSGMII PCS Host side */
+ val = lanphy_read_page_reg(phydev, 5, LAN8814_QSGMII_PCS1G_ANEG_CONFIG);
+ val &= ~LAN8814_QSGMII_PCS1G_ANEG_CONFIG_ANEG_ENA;
+ lanphy_write_page_reg(phydev, 5, LAN8814_QSGMII_PCS1G_ANEG_CONFIG, val);
+
+ /* MDI-X setting for swap A,B transmit */
+ val = lanphy_read_page_reg(phydev, 2, LAN8814_ALIGN_SWAP);
+ val &= ~LAN8814_ALIGN_TX_A_B_SWAP_MASK;
+ val |= LAN8814_ALIGN_TX_A_B_SWAP;
+ lanphy_write_page_reg(phydev, 2, LAN8814_ALIGN_SWAP, val);
+
+ return 0;
+}
+
static int lan8804_config_init(struct phy_device *phydev)
{
int val;
@@ -1793,6 +1824,7 @@ static struct phy_driver ksphy_driver[] = {
.phy_id = PHY_ID_LAN8814,
.phy_id_mask = MICREL_PHY_ID_MASK,
.name = "Microchip INDY Gigabit Quad PHY",
+ .config_init = lan8814_config_init,
.driver_data = &ksz9021_type,
.probe = kszphy_probe,
.soft_reset = genphy_soft_reset,
--
2.33.0