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@linutronix.de>
Reviewed-by: Johannes Zink <j.zink@pengutronix.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c
index 979c755..a3a249c 100644 (file)
--- 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;