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