From bfd9d893edfa8278064c4e914e29cf98e290532e Mon Sep 17 00:00:00 2001 From: Tiezhu Yang Date: Mon, 11 Aug 2025 15:35:06 +0800 Subject: [PATCH] net: stmmac: Return early if invalid in loongson_dwmac_fix_reset() If the MAC controller does not connect to any PHY interface, there is a missing clock, then the DMA reset fails. For this case, the DMA_BUS_MODE_SFT_RESET bit is 1 before software reset, just print an error message which gives a hint the PHY clock is missing, and then return -EINVAL immediately to avoid waiting for the timeout when the DMA reset fails in loongson_dwmac_fix_reset(). With this patch, for the normal end user, the computer start faster with reducing boot time for 2 seconds on the specified mainboard. Signed-off-by: Tiezhu Yang Link: https://patch.msgid.link/20250811073506.27513-4-yangtiezhu@loongson.cn Signed-off-by: Jakub Kicinski --- drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c index 4c477d6ce1e6..6fca0fca4892 100644 --- a/drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c @@ -513,6 +513,11 @@ static int loongson_dwmac_fix_reset(struct stmmac_priv *priv, void __iomem *ioad { u32 value = readl(ioaddr + DMA_BUS_MODE); + if (value & DMA_BUS_MODE_SFT_RESET) { + netdev_err(priv->dev, "the PHY clock is missing\n"); + return -EINVAL; + } + value |= DMA_BUS_MODE_SFT_RESET; writel(value, ioaddr + DMA_BUS_MODE); -- 2.51.0