[source] Make GBit switch work on RB2011

[LEDE Commits]

blogic pushed a commit to source.git, branch master:
https://git.lede-project.org/e457d22261b2dbf5f75f5c73e6930bcecb8e8772

commit e457d22261b2dbf5f75f5c73e6930bcecb8e8772
Author: René Mayrhofer <rene at mayrhofer.eu.org>
AuthorDate: Thu Apr 27 10:08:39 2017 +0200

    Make GBit switch work on RB2011
    
    This change is required to make the GBit switch work on my Mikrotik Routerboard RB2011UiAS-RM, and I assume that the other RB2011 variants are exactly the same in terms of the switch. I have tested the board without and with the patch and confirm that the GBit ports are not supported at all (i.e. no communication works) with the current version in trunk and that everything works with the patch applied. The test box has been running for a few days with the patch applied, and does not s [...]
    
    For the record, the switch chip on my test box is identified as
    	switch0: Atheros AR8327 rev. 4 switch registered on ag71xx-mdio.0
    
    The value 0x6f000000 has been taken from the table at https://wiki.openwrt.org/toh/mikrotik/rb2011uias with the previous discussion thread still online at https://lists.openwrt.org/pipermail/openwrt-devel/2014-December/029949.html.
    One definite improvement from the older OpenWRT trunk version I have been running in production and current LEDE trunk is that the SFP interface can be kept in the default configuration without excessive kernel messages about it constantly going up and down. I have not yet tested an actual SFP module, though.
    
    Performance seems to be reasonable. Routing between two GBit ports on that switch separated by different VLANs with the default firewall ruleset (and one additional rule two allow traffic between the VLANs), but without NAT, iperf3 results are:
    	[ ID] Interval           Transfer     Bandwidth       Retr
    	[  4]   0.00-10.00  sec   508 MBytes   426 Mbits/sec  102             sender
    	[  4]   0.00-10.00  sec   506 MBytes   425 Mbits/sec                  receiver
    With a connection going through NAT (also 2 ports on the same GBit switch, same ruleset, but NAT active), routing performance drops to around 250 MBit/s.
    (Note that RouterOS achieves beyond 900 MBit/s on the same hardware with the default rule set and the FastTrack rule active even for NAT, see https://wiki.mikrotik.com/index.php?title=Manual:IP/Fasttrack and http://www.mikrotik.com/download/share/FastTrack.pdf).
    
    Summarizing, I strongly recommend to apply this patch in trunk, so that the GBit switch chip rev. 4 can be supported upstream in the next LEDE release (hopefully soon).
    
    Signed-off-by: René Mayrhofer <rene at mayrhofer.eu.org>
---
 target/linux/ar71xx/files/arch/mips/ath79/mach-rb2011.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/target/linux/ar71xx/files/arch/mips/ath79/mach-rb2011.c b/target/linux/ar71xx/files/arch/mips/ath79/mach-rb2011.c
index 0db359c..6e49839 100644
--- a/target/linux/ar71xx/files/arch/mips/ath79/mach-rb2011.c
+++ b/target/linux/ar71xx/files/arch/mips/ath79/mach-rb2011.c
@@ -270,6 +270,7 @@ static int __init rb2011_setup(u32 flags)
 	rb2011_nand_init();
 
 	ath79_setup_ar934x_eth_cfg(AR934X_ETH_CFG_RGMII_GMAC0 |
+				   AR934X_ETH_CFG_RXD_DELAY |
 				   AR934X_ETH_CFG_SW_ONLY_MODE);
 
 	ath79_register_mdio(1, 0x0);
@@ -283,7 +284,7 @@ static int __init rb2011_setup(u32 flags)
 	ath79_eth0_data.phy_if_mode = PHY_INTERFACE_MODE_RGMII;
 	ath79_eth0_data.phy_mask = BIT(0);
 	ath79_eth0_data.mii_bus_dev = &ath79_mdio0_device.dev;
-	ath79_eth0_pll_data.pll_1000 = 0x06000000;
+	ath79_eth0_pll_data.pll_1000 = 0x6f000000;
 
 	ath79_register_eth(0);