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brcm63xx: sync mips counters during bringup of cpus

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

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

SVN-Revision: 40387
This commit is contained in:
Jonas Gorski 2014-04-05 18:32:34 +00:00
parent 6d3672b13b
commit 663083d930
4 changed files with 56 additions and 0 deletions
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1
target/linux/brcm63xx/config-3.10
View file

@ -172,6 +172,7 @@ CONFIG_SSB_PCIHOST_POSSIBLE=y
CONFIG_SSB_SPROM=y
CONFIG_SWAP_IO_SPACE=y
CONFIG_SWCONFIG=y
CONFIG_SYNC_R4K=y
CONFIG_SYS_HAS_CPU_BMIPS=y
CONFIG_SYS_HAS_CPU_BMIPS32_3300=y
CONFIG_SYS_HAS_CPU_BMIPS4350=y

1
target/linux/brcm63xx/config-3.14
View file

@ -181,6 +181,7 @@ CONFIG_SSB_PCIHOST_POSSIBLE=y
CONFIG_SSB_SPROM=y
CONFIG_SWAP_IO_SPACE=y
CONFIG_SWCONFIG=y
CONFIG_SYNC_R4K=y
CONFIG_SYS_HAS_CPU_BMIPS=y
CONFIG_SYS_HAS_CPU_BMIPS32_3300=y
CONFIG_SYS_HAS_CPU_BMIPS4350=y

27
target/linux/brcm63xx/patches-3.10/101-MIPS-BCM63XX-sync-mips-counter-during-cpu-bringup.patch Normal file
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@ -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

27
target/linux/brcm63xx/patches-3.14/101-MIPS-BCM63XX-sync-mips-counter-during-cpu-bringup.patch Normal file
View file

@ -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
@@ -132,6 +132,7 @@ config BCM63XX
select BOOT_RAW
select CEVT_R4K
select CSRC_R4K
+ select SYNC_R4K
select DMA_NONCOHERENT
select IRQ_CPU
select SYS_SUPPORTS_32BIT_KERNEL