netdev - [PATCH net 2/2] net: stmmac: skip only stmmac_ptp

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Date:   Mon, 24 Jan 2022 17:59:51 +0800
From:   Mohammad Athari Bin Ismail <mohammad.athari.ismail@...el.com>
To:     Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Jose Abreu <joabreu@...opsys.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Ong Boon Leong <boon.leong.ong@...el.com>,
        Voon Weifeng <weifeng.voon@...el.com>,
        Wong Vee Khee <vee.khee.wong@...el.com>,
        Huacai Chen <chenhuacai@...nel.org>
Cc:     netdev@...r.kernel.org, linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        mohammad.athari.ismail@...el.com
Subject: [PATCH net 2/2] 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: fe1319291150 ("stmmac: Don't init ptp again when resume from suspend/hibernation")
Cc: <stable@...r.kernel.org> # 5.15.x
Signed-off-by: Mohammad Athari Bin Ismail <mohammad.athari.ismail@...el.com>
---
 .../net/ethernet/stmicro/stmmac/stmmac_main.c | 19 +++++++++----------
 1 file changed, 9 insertions(+), 10 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index d7e261768f73..cfea38a50a73 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -884,7 +884,7 @@ EXPORT_SYMBOL_GPL(stmmac_init_tstamp_counter);
  * This is done by looking at the HW cap. register.
  * This function also registers the ptp driver.
  */
-static int stmmac_init_ptp(struct stmmac_priv *priv)
+static int stmmac_init_ptp(struct stmmac_priv *priv, bool ptp_register)
 {
 	bool xmac = priv->plat->has_gmac4 || priv->plat->has_xgmac;
 	int ret;
@@ -914,7 +914,8 @@ static int stmmac_init_ptp(struct stmmac_priv *priv)
 	priv->hwts_tx_en = 0;
 	priv->hwts_rx_en = 0;
 
-	stmmac_ptp_register(priv);
+	if (ptp_register)
+		stmmac_ptp_register(priv);
 
 	return 0;
 }
@@ -3251,7 +3252,7 @@ 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;
@@ -3308,13 +3309,11 @@ 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, ptp_register);
+	if (ret == -EOPNOTSUPP)
+		netdev_warn(priv->dev, "PTP not supported by HW\n");
+	else if (ret)
+		netdev_warn(priv->dev, "PTP init failed\n");
 
 	priv->eee_tw_timer = STMMAC_DEFAULT_TWT_LS;
 
-- 
2.17.1