linux-kernel - [PATCH 3/3] pm: at91: flush data cache and clean, invalidate and disable the L2 cache

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Date:	Thu, 12 Feb 2015 10:52:58 +0800
From:	Wenyou Yang <wenyou.yang@...el.com>
To:	<nicolas.ferre@...el.com>, <linux@...im.org.za>,
	<linux@....linux.org.uk>
CC:	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <sylvain.rochet@...secur.com>,
	<alexandre.belloni@...e-electrons.com>,
	<patrice.vilchez@...el.com>, <sergei.shtylyov@...entembedded.com>,
	<mark.rutland@....com>, <lorenzo.pieralisi@....com>,
	<wenyou.yang@...el.com>
Subject: [PATCH 3/3] pm: at91: flush data cache and clean, invalidate and disable the L2 cache

Flush data cache, and clean, invalidate and disable the L2 cache before going to suspend.
Restore the L2 cache configuration and re-enable the L2 cache after waking up.

Signed-off-by: Wenyou Yang <wenyou.yang@...el.com>
---
 arch/arm/mach-at91/pm.c |    6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/arm/mach-at91/pm.c b/arch/arm/mach-at91/pm.c
index 9075b41..2574bad 100644
--- a/arch/arm/mach-at91/pm.c
+++ b/arch/arm/mach-at91/pm.c
@@ -30,6 +30,7 @@
 #include <asm/mach/time.h>
 #include <asm/mach/irq.h>
 #include <asm/fncpy.h>
+#include <asm/cacheflush.h>
 
 #include <mach/cpu.h>
 #include <mach/hardware.h>
@@ -145,8 +146,13 @@ static void at91_pm_suspend(suspend_state_t state)
 	pm_data |= (state == PM_SUSPEND_MEM) ?
 				AT91_PM_MODE(AT91_PM_SLOW_CLOCK) : 0;
 
+	flush_cache_all();
+	outer_disable();
+
 	at91_suspend_sram_fn(at91_pmc_base, at91_ramc_base[0],
 				at91_ramc_base[1], pm_data);
+
+	outer_resume();
 }
 
 static int at91_pm_enter(suspend_state_t state)
-- 
1.7.9.5

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