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Date:   Thu, 21 May 2020 12:49:34 +0100
From:   Jonathan McDowell <>
To:     Giuseppe Cavallaro <>,
        Alexandre Torgue <>,
        Jose Abreu <>,
        Sergey Sergeev <>,
        Marcel Ziswiler <>
Subject: [PATCH] net: ethernet: stmmac: Enable interface clocks on probe for

The ipq806x_gmac_probe() function enables the PTP clock but not the
appropriate interface clocks. This means that if the bootloader hasn't
done so attempting to bring up the interface will fail with an error

[   59.028131] ipq806x-gmac-dwmac 37600000.ethernet: Failed to reset the dma
[   59.028196] ipq806x-gmac-dwmac 37600000.ethernet eth1: stmmac_hw_setup: DMA engine initialization failed
[   59.034056] ipq806x-gmac-dwmac 37600000.ethernet eth1: stmmac_open: Hw setup failed

This patch, a slightly cleaned up version of one posted by Sergey
Sergeev in:

correctly enables the clock; we have already configured the source just
before this.

Tested on a MikroTik RB3011.

Signed-off-by: Jonathan McDowell <>


diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-ipq806x.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-ipq806x.c
index 6ae13dc19510..02102c781a8c 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-ipq806x.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-ipq806x.c
@@ -319,6 +319,19 @@ static int ipq806x_gmac_probe(struct platform_device *pdev)
 	/* Enable PTP clock */
 	regmap_read(gmac->nss_common, NSS_COMMON_CLK_GATE, &val);
 	val |= NSS_COMMON_CLK_GATE_PTP_EN(gmac->id);
+	switch (gmac->phy_mode) {
+		val |= NSS_COMMON_CLK_GATE_RGMII_RX_EN(gmac->id) |
+		break;
+		val |= NSS_COMMON_CLK_GATE_GMII_RX_EN(gmac->id) |
+		break;
+	default:
+		/* We don't get here; the switch above will have errored out */
+		unreachable();
+	}
 	regmap_write(gmac->nss_common, NSS_COMMON_CLK_GATE, val);
 	if (gmac->phy_mode == PHY_INTERFACE_MODE_SGMII) {

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