From 3630d519d7c3eab92567658690e44ffe0517d109 Mon Sep 17 00:00:00 2001 From: Felix Fietkau Date: Thu, 22 Apr 2021 22:20:58 -0700 Subject: [PATCH] net: ethernet: mtk_eth_soc: reduce MDIO bus access latency usleep_range often ends up sleeping much longer than the 10-20us provided as a range here. This causes significant latency in mdio bus acceses, which easily adds multiple seconds to the boot time on MT7621 when polling DSA slave ports. Use cond_resched instead of usleep_range, since the MDIO access does not take much time Signed-off-by: Felix Fietkau Signed-off-by: Ilya Lipnitskiy Signed-off-by: David S. Miller --- drivers/net/ethernet/mediatek/mtk_eth_soc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c @@ -86,7 +86,7 @@ static int mtk_mdio_busy_wait(struct mtk return 0; if (time_after(jiffies, t_start + PHY_IAC_TIMEOUT)) break; - usleep_range(10, 20); + cond_resched(); } dev_err(eth->dev, "mdio: MDIO timeout\n");