diff options
Diffstat (limited to 'target/linux/generic/backport-5.10/610-v5.13-41-net-ethernet-mtk_eth_soc-reduce-MDIO-bus-access-late.patch')
| -rw-r--r-- | target/linux/generic/backport-5.10/610-v5.13-41-net-ethernet-mtk_eth_soc-reduce-MDIO-bus-access-late.patch | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/target/linux/generic/backport-5.10/610-v5.13-41-net-ethernet-mtk_eth_soc-reduce-MDIO-bus-access-late.patch b/target/linux/generic/backport-5.10/610-v5.13-41-net-ethernet-mtk_eth_soc-reduce-MDIO-bus-access-late.patch new file mode 100644 index 0000000000..7ebc3fa903 --- /dev/null +++ b/target/linux/generic/backport-5.10/610-v5.13-41-net-ethernet-mtk_eth_soc-reduce-MDIO-bus-access-late.patch @@ -0,0 +1,30 @@ +From 3630d519d7c3eab92567658690e44ffe0517d109 Mon Sep 17 00:00:00 2001 +From: Felix Fietkau <nbd@nbd.name> +Date: Thu, 22 Apr 2021 22:20:58 -0700 +Subject: [PATCH] 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: Felix Fietkau <nbd@nbd.name> +Signed-off-by: Ilya Lipnitskiy <ilya.lipnitskiy@gmail.com> +Signed-off-by: David S. Miller <davem@davemloft.net> +--- + drivers/net/ethernet/mediatek/mtk_eth_soc.c | 2 +- + 1 file changed, 1 insertion(+), 1 deletion(-) + +--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c ++++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c +@@ -86,7 +86,7 @@ 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"); |