netdev - [PATCH net-next] stmmac: intel: Enable correction of MAC propagation delay

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Message-Id: <20230818111401.77962-1-kurt@linutronix.de>
Date: Fri, 18 Aug 2023 13:14:01 +0200
From: Kurt Kanzenbach <kurt@...utronix.de>
To: Alexandre Torgue <alexandre.torgue@...s.st.com>,
	Jose Abreu <joabreu@...opsys.com>
Cc: "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Maxime Coquelin <mcoquelin.stm32@...il.com>,
	netdev@...r.kernel.org,
	Johannes Zink <j.zink@...gutronix.de>,
	Richard Cochran <richardcochran@...il.com>,
	Kurt Kanzenbach <kurt@...utronix.de>
Subject: [PATCH net-next] stmmac: intel: Enable correction of MAC propagation delay

All captured timestamps should be corrected by PHY, MAC and CDC introduced
latency/errors. The CDC correction is already used. Enable MAC propagation delay
correction as well which is available since commit 26cfb838aa00 ("net: stmmac:
correct MAC propagation delay").

Before:
|ptp4l[390.458]: rms    7 max   21 freq   +177 +/-  14 delay   357 +/-   1

After:
|ptp4l[620.012]: rms    7 max   20 freq   +195 +/-  14 delay   345 +/-   1

Tested on Intel Elkhart Lake.

Signed-off-by: Kurt Kanzenbach <kurt@...utronix.de>
---
 drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c
index 979c755964b1..a3a249c63598 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c
@@ -627,6 +627,7 @@ static int ehl_common_data(struct pci_dev *pdev,
 	plat->rx_queues_to_use = 8;
 	plat->tx_queues_to_use = 8;
 	plat->flags |= STMMAC_FLAG_USE_PHY_WOL;
+	plat->flags |= STMMAC_FLAG_HWTSTAMP_CORRECT_LATENCY;
 
 	plat->safety_feat_cfg->tsoee = 1;
 	plat->safety_feat_cfg->mrxpee = 1;
-- 
2.39.2