Commit 6cb2e613 authored by Johannes Zink's avatar Johannes Zink Committed by Jakub Kicinski
Browse files

net: stmmac: dwmac-imx: enable MAC propagation delay correction for i.MX8MP 



As the i.MX8MP supports reading MAC propagation delay and correcting the
Hardware timestamp counter for additional delays [1], enable the feature
for this SoC.

This reduces phase error of the PPS output from the PTP Hardware Clock
from approx 150ns to 100ns.

[1] i.MX8MP Reference Manual, rev.1 Section 11.7.2.5.3 "Timestamp
correction"

Signed-off-by: default avatarJohannes Zink <j.zink@pengutronix.de>
Link: https://lore.kernel.org/r/20230719-stmmac_correct_mac_delay-v3-2-61e63427735e@pengutronix.de


Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
parent 26cfb838

drivers/net/ethernet/stmicro/stmmac/dwmac-imx.c

+5 −0
Original line number Diff line number Diff line
@@ -42,6 +42,7 @@ 


struct imx_dwmac_ops {

	u32 addr_width;

	u32 flags;

	bool mac_rgmii_txclk_auto_adj;



	int (*fix_soc_reset)(void *priv, void __iomem *ioaddr);
@@ -311,6 +312,9 @@ static int imx_dwmac_probe(struct platform_device *pdev) 
		goto err_parse_dt;

	}



	if (data->flags & STMMAC_FLAG_HWTSTAMP_CORRECT_LATENCY)

		plat_dat->flags |= STMMAC_FLAG_HWTSTAMP_CORRECT_LATENCY;



	plat_dat->host_dma_width = dwmac->ops->addr_width;

	plat_dat->init = imx_dwmac_init;

	plat_dat->exit = imx_dwmac_exit;
@@ -350,6 +354,7 @@ static struct imx_dwmac_ops imx8mp_dwmac_data = { 
	.addr_width = 34,

	.mac_rgmii_txclk_auto_adj = false,

	.set_intf_mode = imx8mp_set_intf_mode,

	.flags = STMMAC_FLAG_HWTSTAMP_CORRECT_LATENCY,

};



static struct imx_dwmac_ops imx8dxl_dwmac_data = {