From f5b3cd15395c2617585e36b4acf40999616cc60c Mon Sep 17 00:00:00 2001 From: Baptiste Jonglez Date: Thu, 26 Mar 2020 19:03:42 +0100 Subject: [PATCH] ar71xx: Fix gigabit switch support for Mikrotik RB951G-2HnD Without this patch, when using rev 3 of the Atheros AR9344 SoC, the gigabit switch (AR8327) does not work or works very erratically. This is a re-spin of http://patchwork.ozlabs.org/patch/419857/ with a different PLL value, according to the feedback from several users (including myself) as shown here: https://openwrt.org/toh/mikrotik/rb2011uias#tracking_reported_experience_with_suggested_patch_for_the_5_gige_ports Performance is acceptable: testing L3 forwarding without NAT yields a performance of 370 Mbit/s (iperf3 TCP) and 41 Kpps (iperf3 UDP with 64 bytes payload). Both tests show that 100% of CPU time is spent on softirq. A similar fix for a different device (RB2011) was added in e457d22261 ("Make GBit switch work on RB2011"). Signed-off-by: Baptiste Jonglez (cherry picked from commit 247043c968d22c193055a97a9cdf5baef4aaf96d) --- target/linux/ar71xx/files/arch/mips/ath79/mach-rb95x.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/target/linux/ar71xx/files/arch/mips/ath79/mach-rb95x.c b/target/linux/ar71xx/files/arch/mips/ath79/mach-rb95x.c index 33c4f53133..c4cf5f12a8 100644 --- a/target/linux/ar71xx/files/arch/mips/ath79/mach-rb95x.c +++ b/target/linux/ar71xx/files/arch/mips/ath79/mach-rb95x.c @@ -266,6 +266,7 @@ static void __init rb951g_setup(void) return; ath79_setup_ar934x_eth_cfg(AR934X_ETH_CFG_RGMII_GMAC0 | + AR934X_ETH_CFG_RXD_DELAY | AR934X_ETH_CFG_SW_ONLY_MODE); ath79_register_mdio(0, 0x0); @@ -276,6 +277,7 @@ static void __init rb951g_setup(void) ath79_init_mac(ath79_eth0_data.mac_addr, ath79_mac_base, 0); ath79_eth0_data.phy_if_mode = PHY_INTERFACE_MODE_RGMII; ath79_eth0_data.phy_mask = BIT(0); + ath79_eth0_pll_data.pll_1000 = 0x6f000000; ath79_register_eth(0);