1 From: Felix Fietkau <nbd@nbd.name>
2 Date: Mon, 8 Jun 2020 17:02:39 +0200
3 Subject: [PATCH] net: ethernet: mtk_eth_soc: significantly reduce mdio bus
6 usleep_range often ends up sleeping much longer than the 10-20us provided
7 as a range here. This causes significant latency in mdio bus acceses,
8 which easily adds multiple seconds to the boot time on MT7621 when polling
10 Use cond_resched instead of usleep_range, since the MDIO access does not
13 Signed-off-by: Felix Fietkau <nbd@nbd.name>
16 --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
17 +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
18 @@ -85,7 +85,7 @@ static int mtk_mdio_busy_wait(struct mtk
20 if (time_after(jiffies, t_start + PHY_IAC_TIMEOUT))
22 - usleep_range(10, 20);
26 dev_err(eth->dev, "mdio: MDIO timeout\n");