2020-06-08 17:00:02 +00:00
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From: Felix Fietkau <nbd@nbd.name>
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Date: Mon, 8 Jun 2020 17:02:39 +0200
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2020-08-27 04:39:48 +00:00
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Subject: [PATCH] net: ethernet: mtk_eth_soc: significantly reduce mdio bus
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2020-06-08 17:00:02 +00:00
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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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---
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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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@@ -85,7 +85,7 @@ 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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