linux-kernel - [PATCH] ARM: hw_breakpoint: Enable debug powerdown only if system supports 'has

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Date:	Wed, 13 Mar 2013 12:22:33 +0530
From:	Lokesh Vutla <lokeshvutla@...com>
To:	<will.deacon@....com>
CC:	<dietmar.eggemann@....com>, <linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <linux-omap@...r.kernel.org>,
	<santosh.shilimkar@...com>, <lokeshvutla@...com>
Subject: [PATCH] ARM: hw_breakpoint: Enable debug powerdown only if system supports 'has_ossr'

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

So restore that check back to avoid the mentioned issue.

Cc: Dietmar Eggemann <dietmar.eggemann@....com>
Cc: Will Deacon <will.deacon@....com>
Reported-by: Santosh Shilimkar <santosh.shilimkar@...com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@...com>
Signed-off-by: Lokesh Vutla <lokeshvutla@...com>
---
 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)
-- 
1.7.9.5

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