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 <[email protected]>
---
drivers/net/ethernet/stmicro/stmmac/dwmac-imx.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-imx.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-imx.c
index 92e06a96757a..645a9454a490 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-imx.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-imx.c
@@ -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 = {
--
2.39.2