brcm63xx: sync mips counters during bringup of cpus

Fixes gettimeofday returning different values depending on which cpu
it is called.

Signed-off-by: Jonas Gorski <jogo@openwrt.org>

SVN-Revision: 40387

1 files changed, 27 insertions, 0 deletions

diff --git a/target/linux/brcm63xx/patches-3.10/101-MIPS-BCM63XX-sync-mips-counter-during-cpu-bringup.patch b/target/linux/brcm63xx/patches-3.10/101-MIPS-BCM63XX-sync-mips-counter-during-cpu-bringup.patch
new file mode 100644
index 0000000000..21fffb38b0
--- /dev/null
+++ b/target/linux/brcm63xx/patches-3.10/101-MIPS-BCM63XX-sync-mips-counter-during-cpu-bringup.patch
@@ -0,0 +1,27 @@
+From 23c21090f49a64b532755542a71e9aa3e4fc84d9 Mon Sep 17 00:00:00 2001
+From: Jonas Gorski <jogo@openwrt.org>
+Date: Sat, 5 Apr 2014 20:07:25 +0200
+Subject: [PATCH] MIPS: BCM63XX: sync mips counter during cpu bringup
+
+We are using the mips counters as the clock source, so we need to ensure
+they are synced, else e.g. gettimeofday will return different values
+depending on which core it was run.
+
+Observed difference was about 8 seconds, causing ~8 seconds ping or time
+running backwards for some programs.
+
+Signed-off-by: Jonas Gorski <jogo@openwrt.org>
+---
+ arch/mips/Kconfig | 1 +
+ 1 file changed, 1 insertion(+)
+
+--- a/arch/mips/Kconfig
++++ b/arch/mips/Kconfig
+@@ -127,6 +127,7 @@ config BCM63XX
+ 	select BOOT_RAW
+ 	select CEVT_R4K
+ 	select CSRC_R4K
++	select SYNC_R4K
+ 	select DMA_NONCOHERENT
+ 	select IRQ_CPU
+ 	select NR_CPUS_DEFAULT_2