X-Git-Url: http://git.ozo.com/?a=blobdiff_plain;ds=sidebyside;f=target%2Flinux%2Fifxmips%2Fpatches-2.6.28%2F010-mips_clocksource_init_war.patch;fp=target%2Flinux%2Fifxmips%2Fpatches-2.6.28%2F010-mips_clocksource_init_war.patch;h=ac44c308fa850b0d485b615c34bf76c3edcbf276;hb=1d3e394ebecc98074687a56454489b7cd59e3c03;hp=0000000000000000000000000000000000000000;hpb=7d570ded94cb1c8c23bb3f190ffd0d530dfb26e5;p=openwrt-10.03%2F.git

diff --git a/target/linux/ifxmips/patches-2.6.28/010-mips_clocksource_init_war.patch b/target/linux/ifxmips/patches-2.6.28/010-mips_clocksource_init_war.patch
new file mode 100644
index 000000000..ac44c308f
--- /dev/null
+++ b/target/linux/ifxmips/patches-2.6.28/010-mips_clocksource_init_war.patch
@@ -0,0 +1,33 @@
+--- a/arch/mips/kernel/cevt-r4k.c
++++ b/arch/mips/kernel/cevt-r4k.c
+@@ -21,6 +21,22 @@
+ 
+ #ifndef CONFIG_MIPS_MT_SMTC
+ 
++/*
++ * Compare interrupt can be routed and latched outside the core,
++ * so a single execution hazard barrier may not be enough to give
++ * it time to clear as seen in the Cause register.  4 time the
++ * pipeline depth seems reasonably conservative, and empirically
++ * works better in configurations with high CPU/bus clock ratios.
++ */
++
++#define compare_change_hazard() \
++	do { \
++		irq_disable_hazard(); \
++		irq_disable_hazard(); \
++		irq_disable_hazard(); \
++		irq_disable_hazard(); \
++	} while (0)
++
+ static int mips_next_event(unsigned long delta,
+                            struct clock_event_device *evt)
+ {
+@@ -30,6 +46,7 @@ static int mips_next_event(unsigned long
+ 	cnt = read_c0_count();
+ 	cnt += delta;
+ 	write_c0_compare(cnt);
++	compare_change_hazard();
+ 	res = ((int)(read_c0_count() - cnt) > 0) ? -ETIME : 0;
+ 	return res;
+ }