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@microchip.com>
---
This patch is resent because the proposed change request for using
read/write_page will not work for this device. Because lan8814 has a
more complicated mechanism to access extended pages.
---
 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 c6a97fcca0e6..4570cb9535b7 100644
--- a/drivers/net/phy/micrel.c
+++ b/drivers/net/phy/micrel.c
@@ -1578,6 +1578,14 @@ 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)
@@ -1614,6 +1622,29 @@ 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;
@@ -1858,6 +1889,7 @@ 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

Hello:

This patch was applied to netdev/net-next.git (master)
by David S. Miller <davem@davemloft.net>:

On Thu, 23 Dec 2021 09:28:26 +0100 you wrote:
> 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.
> 
> [...]

Here is the summary with links:
  - [resend,net-next] net: phy: micrel: Add config_init for LAN8814
    https://git.kernel.org/netdev/net-next/c/7467d716583e

You are awesome, thank you!
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