X-Git-Url: https://git.rohieb.name/openwrt.git/blobdiff_plain/57e12bbb2422c82e434ba538e79c27f8579b369a..c25f87ed5f099bcf76595678b9146c7da2548e35:/target/linux/ar71xx/patches-2.6.27/902-mips_clocksource_init_war.patch?ds=inline

diff --git a/target/linux/ar71xx/patches-2.6.27/902-mips_clocksource_init_war.patch b/target/linux/ar71xx/patches-2.6.27/902-mips_clocksource_init_war.patch
index bdf0d0fb6..03a66ff13 100644
--- a/target/linux/ar71xx/patches-2.6.27/902-mips_clocksource_init_war.patch
+++ b/target/linux/ar71xx/patches-2.6.27/902-mips_clocksource_init_war.patch
@@ -1,10 +1,9 @@
 --- a/arch/mips/kernel/cevt-r4k.c
 +++ b/arch/mips/kernel/cevt-r4k.c
-@@ -13,6 +13,22 @@
- #include <asm/smtc_ipi.h>
- #include <asm/time.h>
+@@ -15,6 +15,22 @@
+ #include <asm/cevt-r4k.h>
  
-+/*
+ /*
 + * 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
@@ -20,46 +19,38 @@
 +		irq_disable_hazard(); \
 +	} while (0)
 +
- static int mips_next_event(unsigned long delta,
-                            struct clock_event_device *evt)
- {
-@@ -28,6 +44,7 @@
++/*
+  * The SMTC Kernel for the 34K, 1004K, et. al. replaces several
+  * of these routines with SMTC-specific variants.
+  */
+@@ -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;
- #ifdef CONFIG_MIPS_MT_SMTC
- 	evpe(vpflags);
-@@ -187,7 +204,7 @@
- 	 */
- 	if (c0_compare_int_pending()) {
- 		write_c0_compare(read_c0_count());
--		irq_disable_hazard();
-+		compare_change_hazard();
- 		if (c0_compare_int_pending())
- 			return 0;
- 	}
-@@ -196,7 +213,7 @@
- 		cnt = read_c0_count();
- 		cnt += delta;
- 		write_c0_compare(cnt);
--		irq_disable_hazard();
-+		compare_change_hazard();
- 		if ((int)(read_c0_count() - cnt) < 0)
- 		    break;
- 		/* increase delta if the timer was already expired */
-@@ -205,11 +222,12 @@
- 	while ((int)(read_c0_count() - cnt) <= 0)
- 		;	/* Wait for expiry  */
- 
-+	compare_change_hazard();
- 	if (!c0_compare_int_pending())
- 		return 0;
- 
- 	write_c0_compare(read_c0_count());
--	irq_disable_hazard();
-+	compare_change_hazard();
- 	if (c0_compare_int_pending())
- 		return 0;
+ 	return res;
+ }
+@@ -99,22 +116,6 @@ static int c0_compare_int_pending(void)
+ 	return (read_c0_cause() >> cp0_compare_irq) & 0x100;
+ }
  
+-/*
+- * 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)
+-
+ int c0_compare_int_usable(void)
+ {
+ 	unsigned int delta;