Commit 3630d519 authored by Felix Fietkau's avatar Felix Fietkau Committed by David S. Miller
Browse files

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: default avatarFelix Fietkau <nbd@nbd.name>
Signed-off-by: default avatarIlya Lipnitskiy <ilya.lipnitskiy@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent c30c4a82

drivers/net/ethernet/mediatek/mtk_eth_soc.c

+1 −1
Original line number Diff line number Diff line
@@ -86,7 +86,7 @@ static int mtk_mdio_busy_wait(struct mtk_eth *eth) 
			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");