target/linux/generic/backport-5.10/735-v5.14-02-net-dsa-qca8k-use-iopoll-macro-for-qca8k_busy_wait.patch

   1 From 2ad255f2faaffb3af786031fba2e7955454b558a Mon Sep 17 00:00:00 2001
   2 From: Ansuel Smith <ansuelsmth@gmail.com>
   3 Date: Fri, 14 May 2021 22:59:52 +0200
   4 Subject: [PATCH] net: dsa: qca8k: use iopoll macro for qca8k_busy_wait
   5
   6 Use iopoll macro instead of while loop.
   7
   8 Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
   9 Reviewed-by: Andrew Lunn <andrew@lunn.ch>
  10 Signed-off-by: David S. Miller <davem@davemloft.net>
  11 ---
  12  drivers/net/dsa/qca8k.c | 23 +++++++++++------------
  13  drivers/net/dsa/qca8k.h |  2 ++
  14  2 files changed, 13 insertions(+), 12 deletions(-)
  15
  16 --- a/drivers/net/dsa/qca8k.c
  17 +++ b/drivers/net/dsa/qca8k.c
  18 @@ -262,21 +262,20 @@ static struct regmap_config qca8k_regmap
  19  static int
  20  qca8k_busy_wait(struct qca8k_priv *priv, u32 reg, u32 mask)
  21  {
  22 -       unsigned long timeout;
  23 +       u32 val;
  24 +       int ret;
  25
  26 -       timeout = jiffies + msecs_to_jiffies(20);
  27 +       ret = read_poll_timeout(qca8k_read, val, !(val & mask),
  28 +                               0, QCA8K_BUSY_WAIT_TIMEOUT * USEC_PER_MSEC, false,
  29 +                               priv, reg);
  30
  31 -       /* loop until the busy flag has cleared */
  32 -       do {
  33 -               u32 val = qca8k_read(priv, reg);
  34 -               int busy = val & mask;
  35 +       /* Check if qca8k_read has failed for a different reason
  36 +        * before returning -ETIMEDOUT
  37 +        */
  38 +       if (ret < 0 && val < 0)
  39 +               return val;
  40
  41 -               if (!busy)
  42 -                       break;
  43 -               cond_resched();
  44 -       } while (!time_after_eq(jiffies, timeout));
  45 -
  46 -       return time_after_eq(jiffies, timeout);
  47 +       return ret;
  48  }
  49
  50  static void
  51 --- a/drivers/net/dsa/qca8k.h
  52 +++ b/drivers/net/dsa/qca8k.h
  53 @@ -18,6 +18,8 @@
  54  #define PHY_ID_QCA8337                                 0x004dd036
  55  #define QCA8K_ID_QCA8337                               0x13
  56
  57 +#define QCA8K_BUSY_WAIT_TIMEOUT                                20
  58 +
  59  #define QCA8K_NUM_FDB_RECORDS                          2048
  60
  61  #define QCA8K_CPU_PORT                                 0