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

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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: Johannes Zink <j.zink@pengutronix.de>
Link: https://lore.kernel.org/r/20230719-stmmac_correct_mac_delay-v3-2-61e63427735e@pengutronix.de
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Johannes Zink 2023-08-01 17:44:30 +02:00 committed by Jakub Kicinski
parent 26cfb838aa
commit 6cb2e613c7
1 changed files with 5 additions and 0 deletions
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5
drivers/net/ethernet/stmicro/stmmac/dwmac-imx.c
View file

@ -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 = {