target/linux/generic/backport-6.1/706-v6.6-06-net-phy-at803x-add-qca8081-fifo-reset-on-the-link-ch.patch

   1 From 723970affdd8766fa0d91cd34bf2ffc861538b5f Mon Sep 17 00:00:00 2001
   2 From: Luo Jie <quic_luoj@quicinc.com>
   3 Date: Sun, 16 Jul 2023 16:49:24 +0800
   4 Subject: [PATCH 6/6] net: phy: at803x: add qca8081 fifo reset on the link
   5  changed
   6
   7 The qca8081 sgmii fifo needs to be reset on link down and
   8 released on the link up in case of any abnormal issue
   9 such as the packet blocked on the PHY.
  10
  11 Signed-off-by: Luo Jie <quic_luoj@quicinc.com>
  12 Reviewed-by: Andrew Lunn <andrew@lunn.ch>
  13 Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
  14 Signed-off-by: David S. Miller <davem@davemloft.net>
  15 ---
  16  drivers/net/phy/at803x.c | 14 ++++++++++++++
  17  1 file changed, 14 insertions(+)
  18
  19 --- a/drivers/net/phy/at803x.c
  20 +++ b/drivers/net/phy/at803x.c
  21 @@ -276,6 +276,9 @@
  22  #define QCA808X_PHY_MMD7_CHIP_TYPE             0x901d
  23  #define QCA808X_PHY_CHIP_TYPE_1G               BIT(0)
  24
  25 +#define QCA8081_PHY_SERDES_MMD1_FIFO_CTRL      0x9072
  26 +#define QCA8081_PHY_FIFO_RSTN                  BIT(11)
  27 +
  28  MODULE_DESCRIPTION("Qualcomm Atheros AR803x and QCA808X PHY driver");
  29  MODULE_AUTHOR("Matus Ujhelyi");
  30  MODULE_LICENSE("GPL");
  31 @@ -2037,6 +2040,16 @@ static int qca808x_get_features(struct p
  32         return 0;
  33  }
  34
  35 +static void qca808x_link_change_notify(struct phy_device *phydev)
  36 +{
  37 +       /* Assert interface sgmii fifo on link down, deassert it on link up,
  38 +        * the interface device address is always phy address added by 1.
  39 +        */
  40 +       mdiobus_c45_modify_changed(phydev->mdio.bus, phydev->mdio.addr + 1,
  41 +                       MDIO_MMD_PMAPMD, QCA8081_PHY_SERDES_MMD1_FIFO_CTRL,
  42 +                       QCA8081_PHY_FIFO_RSTN, phydev->link ? QCA8081_PHY_FIFO_RSTN : 0);
  43 +}
  44 +
  45  static struct phy_driver at803x_driver[] = {
  46  {
  47         /* Qualcomm Atheros AR8035 */
  48 @@ -2213,6 +2226,7 @@ static struct phy_driver at803x_driver[]
  49         .soft_reset             = qca808x_soft_reset,
  50         .cable_test_start       = qca808x_cable_test_start,
  51         .cable_test_get_status  = qca808x_cable_test_get_status,
  52 +       .link_change_notify     = qca808x_link_change_notify,
  53  }, };
  54
  55  module_phy_driver(at803x_driver);