linux-kernel - [PATCH 5/9] powerpc/85xx: disable irq by hardware when suspend for 64-bit

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Date:	Fri, 7 Mar 2014 12:58:01 +0800
From:	Chenhui Zhao <chenhui.zhao@...escale.com>
To:	<linuxppc-dev@...ts.ozlabs.org>
CC:	<linux-kernel@...r.kernel.org>, <scottwood@...escale.com>,
	<leoli@...escale.com>, <Jason.Jin@...escale.com>
Subject: [PATCH 5/9] powerpc/85xx: disable irq by hardware when suspend for 64-bit

In 64-bit mode, kernel just clears the irq soft-enable flag
in struct paca_struct to disable external irqs. But, in
the case of suspend, irqs should be disabled by hardware.
Therefore, hook a function to ppc_md.suspend_disable_irqs
to really disable irqs.

Signed-off-by: Chenhui Zhao <chenhui.zhao@...escale.com>
---
 arch/powerpc/platforms/85xx/corenet_generic.c |   12 ++++++++++++
 1 files changed, 12 insertions(+), 0 deletions(-)

diff --git a/arch/powerpc/platforms/85xx/corenet_generic.c b/arch/powerpc/platforms/85xx/corenet_generic.c
index 3fdf9f3..983d81f 100644
--- a/arch/powerpc/platforms/85xx/corenet_generic.c
+++ b/arch/powerpc/platforms/85xx/corenet_generic.c
@@ -32,6 +32,13 @@
 #include <sysdev/fsl_pci.h>
 #include "smp.h"
 
+#if defined(CONFIG_PPC64) && defined(CONFIG_SUSPEND)
+static void fsl_suspend_disable_irqs(void)
+{
+	__hard_irq_disable();
+}
+#endif
+
 void __init corenet_gen_pic_init(void)
 {
 	struct mpic *mpic;
@@ -58,6 +65,11 @@ void __init corenet_gen_setup_arch(void)
 
 	fsl_rcpm_init();
 
+#if defined(CONFIG_PPC64) && defined(CONFIG_SUSPEND)
+	/* physically disable irq for 64-bit mode when suspend */
+	ppc_md.suspend_disable_irqs = fsl_suspend_disable_irqs;
+#endif
+
 	pr_info("%s board from Freescale Semiconductor\n", ppc_md.name);
 }
 
-- 
1.7.3


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