target/linux/ath79/patches-5.10/900-mdio_bitbang_ignore_ta_value.patch

   1 From: Jonas Gorski <jogo@openwrt.org>
   2 Subject: ar71xx: add a workaround for ar8316 not always driving the TA bit to low
   3
   4 AR8316 behind a GPIO bitbanged MDIO bus fails to drive the turnaround bit
   5 to low despite returning a valid value. Ignore it and just use the
   6 returned value anyway.
   7
   8 SVN-Revision: 28422
   9 ---
  10  drivers/net/mdio/mdio-bitbang.c               | 16 ++-----------------
  11  1 file changed, 2 insertions(+), 14 deletions(-)
  12
  13 --- a/drivers/net/mdio/mdio-bitbang.c
  14 +++ b/drivers/net/mdio/mdio-bitbang.c
  15 @@ -152,7 +152,7 @@ static int mdiobb_cmd_addr(struct mdiobb
  16  static int mdiobb_read(struct mii_bus *bus, int phy, int reg)
  17  {
  18         struct mdiobb_ctrl *ctrl = bus->priv;
  19 -       int ret, i;
  20 +       int ret;
  21
  22         if (reg & MII_ADDR_C45) {
  23                 reg = mdiobb_cmd_addr(ctrl, phy, reg);
  24 @@ -162,19 +162,7 @@ static int mdiobb_read(struct mii_bus *b
  25
  26         ctrl->ops->set_mdio_dir(ctrl, 0);
  27
  28 -       /* check the turnaround bit: the PHY should be driving it to zero, if this
  29 -        * PHY is listed in phy_ignore_ta_mask as having broken TA, skip that
  30 -        */
  31 -       if (mdiobb_get_bit(ctrl) != 0 &&
  32 -           !(bus->phy_ignore_ta_mask & (1 << phy))) {
  33 -               /* PHY didn't drive TA low -- flush any bits it
  34 -                * may be trying to send.
  35 -                */
  36 -               for (i = 0; i < 32; i++)
  37 -                       mdiobb_get_bit(ctrl);
  38 -
  39 -               return 0xffff;
  40 -       }
  41 +       mdiobb_get_bit(ctrl);
  42
  43         ret = mdiobb_get_num(ctrl, 16);
  44         mdiobb_get_bit(ctrl);