From 6ad1668c37fef80075e1a69b0ef71d0f8bbeb9c3 Mon Sep 17 00:00:00 2001 From: thl Date: Tue, 16 Dec 2008 14:07:55 +0000 Subject: [ifxmips] cleanup sources and prepare for 2.6.27 git-svn-id: svn://svn.openwrt.org/openwrt/trunk@13660 3c298f89-4303-0410-b956-a3cf2f4a3e73 --- .../patches/010-mips_clocksource_init_war.patch | 65 ++++++++++++++++++++++ 1 file changed, 65 insertions(+) create mode 100644 target/linux/ifxmips/patches/010-mips_clocksource_init_war.patch (limited to 'target/linux/ifxmips/patches/010-mips_clocksource_init_war.patch') diff --git a/target/linux/ifxmips/patches/010-mips_clocksource_init_war.patch b/target/linux/ifxmips/patches/010-mips_clocksource_init_war.patch new file mode 100644 index 000000000..61d9610cf --- /dev/null +++ b/target/linux/ifxmips/patches/010-mips_clocksource_init_war.patch @@ -0,0 +1,65 @@ +--- a/arch/mips/kernel/cevt-r4k.c ++++ b/arch/mips/kernel/cevt-r4k.c +@@ -13,6 +13,22 @@ + #include + #include + ++/* ++ * 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) + { +@@ -28,6 +44,7 @@ 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 @@ static int c0_compare_int_usable(void) + */ + 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 @@ static int c0_compare_int_usable(void) + 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 @@ static int c0_compare_int_usable(void) + 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; + -- cgit v1.2.3