target/linux/generic/backport-5.10/735-v5.14-22-net-dsa-qca8k-improve-internal-mdio-read-write-bus-a.patch

   1 From b7ebac354d54f1657bb89b7a7ca149db50203e6a Mon Sep 17 00:00:00 2001
   2 From: Ansuel Smith <ansuelsmth@gmail.com>
   3 Date: Fri, 14 May 2021 23:00:12 +0200
   4 Subject: [PATCH] net: dsa: qca8k: improve internal mdio read/write bus access
   5
   6 Improve the internal mdio read/write bus access by caching the value
   7 without accessing it for every read/write.
   8
   9 Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
  10 Signed-off-by: David S. Miller <davem@davemloft.net>
  11 ---
  12  drivers/net/dsa/qca8k.c | 28 +++++++++++++++-------------
  13  1 file changed, 15 insertions(+), 13 deletions(-)
  14
  15 --- a/drivers/net/dsa/qca8k.c
  16 +++ b/drivers/net/dsa/qca8k.c
  17 @@ -655,6 +655,7 @@ static int
  18  qca8k_mdio_write(struct mii_bus *salve_bus, int phy, int regnum, u16 data)
  19  {
  20         struct qca8k_priv *priv = salve_bus->priv;
  21 +       struct mii_bus *bus = priv->bus;
  22         u16 r1, r2, page;
  23         u32 val;
  24         int ret;
  25 @@ -669,22 +670,22 @@ qca8k_mdio_write(struct mii_bus *salve_b
  26
  27         qca8k_split_addr(QCA8K_MDIO_MASTER_CTRL, &r1, &r2, &page);
  28
  29 -       mutex_lock_nested(&priv->bus->mdio_lock, MDIO_MUTEX_NESTED);
  30 +       mutex_lock_nested(&bus->mdio_lock, MDIO_MUTEX_NESTED);
  31
  32 -       ret = qca8k_set_page(priv->bus, page);
  33 +       ret = qca8k_set_page(bus, page);
  34         if (ret)
  35                 goto exit;
  36
  37 -       qca8k_mii_write32(priv->bus, 0x10 | r2, r1, val);
  38 +       qca8k_mii_write32(bus, 0x10 | r2, r1, val);
  39
  40 -       ret = qca8k_mdio_busy_wait(priv->bus, QCA8K_MDIO_MASTER_CTRL,
  41 +       ret = qca8k_mdio_busy_wait(bus, QCA8K_MDIO_MASTER_CTRL,
  42                                    QCA8K_MDIO_MASTER_BUSY);
  43
  44  exit:
  45         /* even if the busy_wait timeouts try to clear the MASTER_EN */
  46 -       qca8k_mii_write32(priv->bus, 0x10 | r2, r1, 0);
  47 +       qca8k_mii_write32(bus, 0x10 | r2, r1, 0);
  48
  49 -       mutex_unlock(&priv->bus->mdio_lock);
  50 +       mutex_unlock(&bus->mdio_lock);
  51
  52         return ret;
  53  }
  54 @@ -693,6 +694,7 @@ static int
  55  qca8k_mdio_read(struct mii_bus *salve_bus, int phy, int regnum)
  56  {
  57         struct qca8k_priv *priv = salve_bus->priv;
  58 +       struct mii_bus *bus = priv->bus;
  59         u16 r1, r2, page;
  60         u32 val;
  61         int ret;
  62 @@ -706,26 +708,26 @@ qca8k_mdio_read(struct mii_bus *salve_bu
  63
  64         qca8k_split_addr(QCA8K_MDIO_MASTER_CTRL, &r1, &r2, &page);
  65
  66 -       mutex_lock_nested(&priv->bus->mdio_lock, MDIO_MUTEX_NESTED);
  67 +       mutex_lock_nested(&bus->mdio_lock, MDIO_MUTEX_NESTED);
  68
  69 -       ret = qca8k_set_page(priv->bus, page);
  70 +       ret = qca8k_set_page(bus, page);
  71         if (ret)
  72                 goto exit;
  73
  74 -       qca8k_mii_write32(priv->bus, 0x10 | r2, r1, val);
  75 +       qca8k_mii_write32(bus, 0x10 | r2, r1, val);
  76
  77 -       ret = qca8k_mdio_busy_wait(priv->bus, QCA8K_MDIO_MASTER_CTRL,
  78 +       ret = qca8k_mdio_busy_wait(bus, QCA8K_MDIO_MASTER_CTRL,
  79                                    QCA8K_MDIO_MASTER_BUSY);
  80         if (ret)
  81                 goto exit;
  82
  83 -       val = qca8k_mii_read32(priv->bus, 0x10 | r2, r1);
  84 +       val = qca8k_mii_read32(bus, 0x10 | r2, r1);
  85
  86  exit:
  87         /* even if the busy_wait timeouts try to clear the MASTER_EN */
  88 -       qca8k_mii_write32(priv->bus, 0x10 | r2, r1, 0);
  89 +       qca8k_mii_write32(bus, 0x10 | r2, r1, 0);
  90
  91 -       mutex_unlock(&priv->bus->mdio_lock);
  92 +       mutex_unlock(&bus->mdio_lock);
  93
  94         if (val >= 0)
  95                 val &= QCA8K_MDIO_MASTER_DATA_MASK;