target/linux/layerscape/patches-5.4/701-net-0407-LF-924-net-enetc-Set-MAC-Rx-FIFO-to-recommended-valu.patch

   1 From 9507f517ac4080627515c31c937f45a4a58ccbe4 Mon Sep 17 00:00:00 2001
   2 From: Alex Marginean <alexandru.marginean@nxp.com>
   3 Date: Fri, 14 Feb 2020 17:28:26 +0000
   4 Subject: [PATCH] LF-924: net/enetc: Set MAC Rx FIFO to recommended value
   5
   6 On LS1028A the MAC Rx FIFO defaults to value 2, which is too high and may
   7 lead to Rx lock-up under traffic.  Set it to 1 instead, as recommended by
   8 the hardware team.
   9
  10 Signed-off-by: Alex Marginean <alexandru.marginean@nxp.com>
  11 Reviewed-by: Claudiu Manoil <claudiu.manoil@nxp.com>
  12 Acked-by: Jason Liu <jason.hui.liu@nxp.com>
  13 ---
  14  drivers/net/ethernet/freescale/enetc/enetc_hw.h | 2 ++
  15  drivers/net/ethernet/freescale/enetc/enetc_pf.c | 6 ++++++
  16  2 files changed, 8 insertions(+)
  17
  18 --- a/drivers/net/ethernet/freescale/enetc/enetc_hw.h
  19 +++ b/drivers/net/ethernet/freescale/enetc/enetc_hw.h
  20 @@ -226,6 +226,8 @@ enum enetc_bdr_type {TX, RX};
  21  #define ENETC_PM0_MAXFRM       0x8014
  22  #define ENETC_SET_TX_MTU(val)  ((val) << 16)
  23  #define ENETC_SET_MAXFRM(val)  ((val) & 0xffff)
  24 +#define ENETC_PM0_RX_FIFO      0x801c
  25 +#define ENETC_PM0_RX_FIFO_VAL  1
  26
  27  #define ENETC_PM_IMDIO_BASE    0x8030
  28  /* PCS registers */
  29 --- a/drivers/net/ethernet/freescale/enetc/enetc_pf.c
  30 +++ b/drivers/net/ethernet/freescale/enetc/enetc_pf.c
  31 @@ -536,6 +536,12 @@ static void enetc_configure_port_mac(str
  32                 enetc_port_wr(hw, ENETC_PM0_IF_MODE, ENETC_PM0_IFM_XGMII);
  33                 enetc_port_wr(hw, ENETC_PM1_IF_MODE, ENETC_PM0_IFM_XGMII);
  34         }
  35 +
  36 +       /* on LS1028A the MAC Rx FIFO defaults to value 2, which is too high and
  37 +        * may lead to Rx lock-up under traffic.  Set it to 1 instead, as
  38 +        * recommended by the hardware team.
  39 +        */
  40 +       enetc_port_wr(hw, ENETC_PM0_RX_FIFO, ENETC_PM0_RX_FIFO_VAL);
  41  }
  42
  43  static void enetc_configure_port_pmac(struct enetc_hw *hw)