linux-kernel - [PATCH] ARM: suspend: use flush range instead of flush all

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Date:	Wed, 12 Sep 2012 15:18:48 +0800
From:	wzch <wzch@...vell.com>
To:	Russell King <linux@....linux.org.uk>,
	Dave Martin <dave.martin@...aro.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:	Wenzeng Chen <wzch@...vell.com>
Subject: [PATCH] ARM: suspend: use flush range instead of flush all

From: Wenzeng Chen <wzch@...vell.com>

In cpu suspend function __cpu_suspend_save(), we save cp15 registers,
resume function, sp and suspend_pgd, then flush the data to DDR, but
no need to flush all D cache, only need to flush range.

Change-Id: I591a1fde929f3f987c69306b601843ed975d3e41
Signed-off-by: Wenzeng Chen <wzch@...vell.com>
---
 arch/arm/kernel/suspend.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/arch/arm/kernel/suspend.c b/arch/arm/kernel/suspend.c
index 1794cc3..bb582d8 100644
--- a/arch/arm/kernel/suspend.c
+++ b/arch/arm/kernel/suspend.c
@@ -17,6 +17,7 @@ extern void cpu_resume_mmu(void);
  */
 void __cpu_suspend_save(u32 *ptr, u32 ptrsz, u32 sp, u32 *save_ptr)
 {
+	u32 *ptr_orig = ptr;
 	*save_ptr = virt_to_phys(ptr);
 
 	/* This must correspond to the LDM in cpu_resume() assembly */
@@ -26,7 +27,8 @@ void __cpu_suspend_save(u32 *ptr, u32 ptrsz, u32 sp, u32 *save_ptr)
 
 	cpu_do_suspend(ptr);
 
-	flush_cache_all();
+	__cpuc_flush_dcache_area((void *)ptr_orig, ptrsz);
+	__cpuc_flush_dcache_area((void *)save_ptr, sizeof(*save_ptr));
 	outer_clean_range(*save_ptr, *save_ptr + ptrsz);
 	outer_clean_range(virt_to_phys(save_ptr),
 			  virt_to_phys(save_ptr) + sizeof(*save_ptr));
-- 
1.7.1

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