[PATCH net-next 7/9] net: stmmac: qcom-ethqos: set initial RGMII link clock to lowest speed
From: Mohd Ayaan Anwar <mohd.anwar@oss.qualcomm.com>
Date: 2026-09-03 18:55:02
Also in:
linux-arm-kernel, linux-arm-msm, linux-devicetree, lkml
Subsystem:
networking drivers, qualcomm ethqos ethernet driver, stmmac ethernet driver, the rest · Maintainers:
Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Mohd Ayaan Anwar, Maxime Chevallier, Linus Torvalds
On probe the RGMII link clock is initialised at SPEED_1000, which translates to a 250 MHz source clock even when no PHY link is present, drawing unnecessary power. Initialise at SPEED_10 instead; fix_mac_speed updates the rate once a link is established. Signed-off-by: Mohd Ayaan Anwar <mohd.anwar@oss.qualcomm.com> --- drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
index 2ca2f03de30174c9771fdc517c0e21e3b392ad76..4f9bef662c5796ce3cca64b19a595bcdbebbf336 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c@@ -814,7 +814,7 @@ static int qcom_ethqos_probe(struct platform_device *pdev) "Failed to get serdes phy\n"); ethqos_set_clk_tx_rate(ethqos, NULL, plat_dat->phy_interface, - SPEED_1000); + SPEED_10); qcom_ethqos_set_sgmii_loopback(ethqos, true); ethqos_set_func_clk_en(ethqos);
--
2.34.1