On 13/03/13 06:52, Lokesh Vutla wrote:
Commit {9a6eb31 ARM: hw_breakpoint: Debug powerdown support for self-hosted
debug} introduces debug powerdown support for self-hosted debug.
While merging the patch 'has_ossr' check was removed which
was needed for hardwares which doesn't support self-hosted debug.
Pandaboard (A9) is one such hardware and Dietmar's orginial
patch did mention this issue.
Without that check on Panda with CPUIDLE enabled, a flood of
below messages thrown.
[ 3.597930] hw-breakpoint: CPU 0 failed to disable vector catch
[ 3.597991] hw-breakpoint: CPU 1 failed to disable vector catch
Hi Lokesh,
I confirm that this has_ossr condition has to go back into the
pm_init(void) call. I just verified it again on my Panda board and I get
the same issue like you without it.
I guess what was happening is that Will asked me if this check is really
necessary and I said No without re-testing on my Panda board as an V7
debug architecture example where OSSR is not implemented. Since then I
only tested in on V7.1 debug architectures where OSSR is mandatory.
Sorry about this and thanks for catching this.
You can add my Acked-by: if you wish.
-- Dietmar
So restore that check back to avoid the mentioned issue.
Cc: Dietmar Eggemann <dietmar.eggemann@xxxxxxx>
Cc: Will Deacon <will.deacon@xxxxxxx>
Reported-by: Santosh Shilimkar <santosh.shilimkar@xxxxxx>
Acked-by: Santosh Shilimkar <santosh.shilimkar@xxxxxx>
Signed-off-by: Lokesh Vutla <lokeshvutla@xxxxxx>
---
arch/arm/kernel/hw_breakpoint.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/arch/arm/kernel/hw_breakpoint.c b/arch/arm/kernel/hw_breakpoint.c
index 96093b7..0ba062d 100644
--- a/arch/arm/kernel/hw_breakpoint.c
+++ b/arch/arm/kernel/hw_breakpoint.c
@@ -1049,7 +1049,8 @@ static struct notifier_block __cpuinitdata dbg_cpu_pm_nb = {
static void __init pm_init(void)
{
- cpu_pm_register_notifier(&dbg_cpu_pm_nb);
+ if (has_ossr)
+ cpu_pm_register_notifier(&dbg_cpu_pm_nb);
}
#else
static inline void pm_init(void)
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