mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-27 01:11:14 +00:00
27 lines
869 B
Diff
27 lines
869 B
Diff
|
From: Felix Fietkau <nbd@nbd.name>
|
||
|
|
Date: Mon, 8 Jun 2020 17:02:39 +0200
|
||
|
|
Subject: [PATCH] net: ethernet: mediatek: significantly 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 <nbd@nbd.name>
|
||
|
|
---
|
||
|
|
|
||
|
|
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
|
||
|
|
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
|
||
|
|
@@ -85,7 +85,7 @@ 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");
|