diff options
Diffstat (limited to 'target/linux/generic/patches-3.3/992-mpcore_wdt_fix_watchdog_counter_loading.patch')
| -rw-r--r-- | target/linux/generic/patches-3.3/992-mpcore_wdt_fix_watchdog_counter_loading.patch | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/target/linux/generic/patches-3.3/992-mpcore_wdt_fix_watchdog_counter_loading.patch b/target/linux/generic/patches-3.3/992-mpcore_wdt_fix_watchdog_counter_loading.patch new file mode 100644 index 000000000..fb16e2aa6 --- /dev/null +++ b/target/linux/generic/patches-3.3/992-mpcore_wdt_fix_watchdog_counter_loading.patch @@ -0,0 +1,64 @@ +Although the commit "98af057092f8f0dabe63c5df08adc2bbfbddb1d2 + ARM: 6126/1: ARM mpcore_wdt: fix build failure and other fixes" +resolved long standing mpcore_wdt driver build problems, it +introduced an error in the relationship between the MPcore watchdog +timer clock rate and mpcore_margin, "MPcore timer margin in seconds", +such that watchdog timeouts are now arbitrary rather than the number +of seconds specified by mpcore_margin. + +This change restores mpcore_wdt_keepalive() to its equivalent +implementation prior to commit 98af057 such that watchdog timeouts now +occur as specified by mpcore_margin. + +The variable 'mpcore_timer_rate' which caused that build failure was +replaced by 'twd_timer_rate'. Adding exported function to obtain +'twd_timer_rate' value in mpcore_wdt driver. + +MPCORE_WATCHDOG needed to build 'mpcore_wdt' already depends on +HAVE_ARM_TWD needed to build 'smp_twd', so from the point of view of +'mpcore_wdt' driver the exported function will always exist. + +Signed-off-by: Valentine Barshak <vbarshak@mvista.com> +Signed-off-by: Vitaly Kuzmichev <vkuzmichev@mvista.com> +--- + + arch/arm/include/asm/smp_twd.h | 1 + + arch/arm/kernel/smp_twd.c | 7 +++++++ + drivers/watchdog/mpcore_wdt.c | 4 +--- + 3 files changed, 9 insertions(+), 3 deletions(-) + +--- a/arch/arm/include/asm/smp_twd.h ++++ b/arch/arm/include/asm/smp_twd.h +@@ -24,5 +24,6 @@ extern void __iomem *twd_base; + + void twd_timer_setup(struct clock_event_device *); + void twd_timer_stop(struct clock_event_device *); ++unsigned long twd_timer_get_rate(void); + + #endif +--- a/arch/arm/kernel/smp_twd.c ++++ b/arch/arm/kernel/smp_twd.c +@@ -268,3 +268,10 @@ void __cpuinit twd_timer_setup(struct cl + 0xf, 0xffffffff); + enable_percpu_irq(clk->irq, 0); + } ++ ++/* Needed by mpcore_wdt */ ++unsigned long twd_timer_get_rate(void) ++{ ++ return twd_timer_rate; ++} ++EXPORT_SYMBOL_GPL(twd_timer_get_rate); +--- a/drivers/watchdog/mpcore_wdt.c ++++ b/drivers/watchdog/mpcore_wdt.c +@@ -99,9 +99,7 @@ static void mpcore_wdt_keepalive(struct + + spin_lock(&wdt_lock); + /* Assume prescale is set to 256 */ +- count = __raw_readl(wdt->base + TWD_WDOG_COUNTER); +- count = (0xFFFFFFFFU - count) * (HZ / 5); +- count = (count / 256) * mpcore_margin; ++ count = (twd_timer_get_rate() / 256) * mpcore_margin; + + /* Reload the counter */ + writel(count + wdt->perturb, wdt->base + TWD_WDOG_LOAD); |