target/linux/generic/backport-5.15/790-v6.0-net-mii-add-mii_bmcr_encode_fixed.patch

   1 From bdb6cfe7512f7a214815a3092f0be50963dcacbc Mon Sep 17 00:00:00 2001
   2 From: "Russell King (Oracle)" <rmk+kernel@armlinux.org.uk>
   3 Date: Sat, 18 Jun 2022 11:28:32 +0100
   4 Subject: [PATCH] net: mii: add mii_bmcr_encode_fixed()
   5
   6 Add a function to encode a fixed speed/duplex to a BMCR value.
   7
   8 Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
   9 Signed-off-by: David S. Miller <davem@davemloft.net>
  10 ---
  11  include/linux/mii.h | 35 +++++++++++++++++++++++++++++++++++
  12  1 file changed, 35 insertions(+)
  13
  14 --- a/include/linux/mii.h
  15 +++ b/include/linux/mii.h
  16 @@ -595,4 +595,39 @@ static inline u8 mii_resolve_flowctrl_fd
  17         return cap;
  18  }
  19
  20 +/**
  21 + * mii_bmcr_encode_fixed - encode fixed speed/duplex settings to a BMCR value
  22 + * @speed: a SPEED_* value
  23 + * @duplex: a DUPLEX_* value
  24 + *
  25 + * Encode the speed and duplex to a BMCR value. 2500, 1000, 100 and 10 Mbps are
  26 + * supported. 2500Mbps is encoded to 1000Mbps. Other speeds are encoded as 10
  27 + * Mbps. Unknown duplex values are encoded to half-duplex.
  28 + */
  29 +static inline u16 mii_bmcr_encode_fixed(int speed, int duplex)
  30 +{
  31 +       u16 bmcr;
  32 +
  33 +       switch (speed) {
  34 +       case SPEED_2500:
  35 +       case SPEED_1000:
  36 +               bmcr = BMCR_SPEED1000;
  37 +               break;
  38 +
  39 +       case SPEED_100:
  40 +               bmcr = BMCR_SPEED100;
  41 +               break;
  42 +
  43 +       case SPEED_10:
  44 +       default:
  45 +               bmcr = BMCR_SPEED10;
  46 +               break;
  47 +       }
  48 +
  49 +       if (duplex == DUPLEX_FULL)
  50 +               bmcr |= BMCR_FULLDPLX;
  51 +
  52 +       return bmcr;
  53 +}
  54 +
  55  #endif /* __LINUX_MII_H__ */