target/linux/generic/backport-5.15/703-13-v5.17-net-dsa-mark-DSA-phylink-as-legacy_pre_march2020.patch

   1 From 0a9f0794d9bd67e590a9488afe87fbb0419d9539 Mon Sep 17 00:00:00 2001
   2 From: "Russell King (Oracle)" <rmk+kernel@armlinux.org.uk>
   3 Date: Thu, 9 Dec 2021 13:11:38 +0000
   4 Subject: [PATCH] net: dsa: mark DSA phylink as legacy_pre_march2020
   5
   6 The majority of DSA drivers do not make use of the PCS support, and
   7 thus operate in legacy mode. In order to preserve this behaviour in
   8 future, we need to set the legacy_pre_march2020 flag so phylink knows
   9 this may require the legacy calls.
  10
  11 There are some DSA drivers that do make use of PCS support, and these
  12 will continue operating as before - legacy_pre_march2020 will not
  13 prevent split-PCS support enabling the newer phylink behaviour.
  14
  15 Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
  16 Signed-off-by: Jakub Kicinski <kuba@kernel.org>
  17 ---
  18  net/dsa/port.c | 7 +++++++
  19  1 file changed, 7 insertions(+)
  20
  21 --- a/net/dsa/port.c
  22 +++ b/net/dsa/port.c
  23 @@ -1126,6 +1126,13 @@ int dsa_port_phylink_create(struct dsa_p
  24         if (err)
  25                 mode = PHY_INTERFACE_MODE_NA;
  26
  27 +       /* Presence of phylink_mac_link_state or phylink_mac_an_restart is
  28 +        * an indicator of a legacy phylink driver.
  29 +        */
  30 +       if (ds->ops->phylink_mac_link_state ||
  31 +           ds->ops->phylink_mac_an_restart)
  32 +               dp->pl_config.legacy_pre_march2020 = true;
  33 +
  34         if (ds->ops->phylink_get_caps)
  35                 ds->ops->phylink_get_caps(ds, dp->index, &dp->pl_config);
  36