net: stmmac: skip only stmmac_ptp_register when resume from suspend

BugLink: https://bugs.launchpad.net/bugs/1959879
commit 0735e639f129dff455aeb91da291f5c578cc33db upstream.

When resume from suspend, besides skipping PTP registration, it also
skipping PTP HW initialization. This could cause PTP clock not able to
operate properly when resume from suspend.

To fix this, only stmmac_ptp_register() is skipped when resume from
suspend.

Fixes: fe1319291150 ("stmmac: Don't init ptp again when resume from suspend/hibernation")
Cc: <stable@vger.kernel.org> # 5.15.x
Signed-off-by: Mohammad Athari Bin Ismail <mohammad.athari.ismail@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Paolo Pisati <paolo.pisati@canonical.com>

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 6c893c6e82dcffdbb35d0ea35b0f1a5204883388..9f3d18abf62b35f016e4e3a5d43aaba2e040a4c1 100644 (file)
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -924,8 +924,6 @@ static int stmmac_init_ptp(struct stmmac_priv *priv)
        priv->hwts_tx_en = 0;
        priv->hwts_rx_en = 0;
 
-       stmmac_ptp_register(priv);
-
        return 0;
 }
 
@@ -3240,7 +3238,7 @@ static int stmmac_fpe_start_wq(struct stmmac_priv *priv)
 /**
  * stmmac_hw_setup - setup mac in a usable state.
  *  @dev : pointer to the device structure.
- *  @init_ptp: initialize PTP if set
+ *  @ptp_register: register PTP if set
  *  Description:
  *  this is the main function to setup the HW in a usable state because the
  *  dma engine is reset, the core registers are configured (e.g. AXI,
@@ -3250,7 +3248,7 @@ static int stmmac_fpe_start_wq(struct stmmac_priv *priv)
  *  0 on success and an appropriate (-)ve integer as defined in errno.h
  *  file on failure.
  */
-static int stmmac_hw_setup(struct net_device *dev, bool init_ptp)
+static int stmmac_hw_setup(struct net_device *dev, bool ptp_register)
 {
        struct stmmac_priv *priv = netdev_priv(dev);
        u32 rx_cnt = priv->plat->rx_queues_to_use;
@@ -3307,13 +3305,13 @@ static int stmmac_hw_setup(struct net_device *dev, bool init_ptp)
 
        stmmac_mmc_setup(priv);
 
-       if (init_ptp) {
-               ret = stmmac_init_ptp(priv);
-               if (ret == -EOPNOTSUPP)
-                       netdev_warn(priv->dev, "PTP not supported by HW\n");
-               else if (ret)
-                       netdev_warn(priv->dev, "PTP init failed\n");
-       }
+       ret = stmmac_init_ptp(priv);
+       if (ret == -EOPNOTSUPP)
+               netdev_warn(priv->dev, "PTP not supported by HW\n");
+       else if (ret)
+               netdev_warn(priv->dev, "PTP init failed\n");
+       else if (ptp_register)
+               stmmac_ptp_register(priv);
 
        priv->eee_tw_timer = STMMAC_DEFAULT_TWT_LS;