target/linux/bcm27xx/patches-5.15/950-0500-net-phy-lan87xx-Allow-more-time-for-link-detect.patch

   1 From eb860f6a2dee9a4c94a7101c1d43194b95fdbc8d Mon Sep 17 00:00:00 2001
   2 From: Phil Elwell <phil@raspberrypi.com>
   3 Date: Wed, 22 Sep 2021 15:38:13 +0100
   4 Subject: [PATCH] net: phy: lan87xx: Allow more time for link detect
   5
   6 With EDPWRDOWN set in idle, it must be cleared before checking for
   7 ENERGYON going high, indicating that a link is being established.
   8 The existing code allows 640ms for ENERGYON to go high, but on
   9 Raspberry Pis that appears not to be enough, causing link detection
  10 to fail.
  11
  12 Increase the polling timeout to 1500ms - with a polling interval of
  13 10ms it shouldn't cause unnecessary delays.
  14
  15 See: https://github.com/raspberrypi/linux/issues/4393
  16
  17 Signed-off-by: Phil Elwell <phil@raspberrypi.com>
  18 ---
  19  drivers/net/phy/smsc.c | 4 ++--
  20  1 file changed, 2 insertions(+), 2 deletions(-)
  21
  22 --- a/drivers/net/phy/smsc.c
  23 +++ b/drivers/net/phy/smsc.c
  24 @@ -230,12 +230,12 @@ static int lan87xx_read_status(struct ph
  25                 if (rc < 0)
  26                         return rc;
  27
  28 -               /* Wait max 640 ms to detect energy and the timeout is not
  29 +               /* Wait max 1500 ms to detect energy and the timeout is not
  30                  * an actual error.
  31                  */
  32                 read_poll_timeout(phy_read, rc,
  33                                   rc & MII_LAN83C185_ENERGYON || rc < 0,
  34 -                                 10000, 640000, true, phydev,
  35 +                                 10000, 1500000, true, phydev,
  36                                   MII_LAN83C185_CTRL_STATUS);
  37                 if (rc < 0)
  38                         return rc;