net: stmmac: skip only stmmac_ptp_register when resume from suspend

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: 6b7876156fc9 ("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>

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 25c802344356a5cc6f02243027e4461f90ed9e56..639a753266e67ff2ed80b322ae96f56e8345c737 100644 (file)
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -915,8 +915,6 @@ 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;
 }
 
@@ -3242,7 +3240,7 @@ 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,
@@ -3252,7 +3250,7 @@ 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;
@@ -3309,13 +3307,13 @@ 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;