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Subject[PATCH] ARM: suspend: use flush range instead of flush all
Date
From: Wenzeng Chen <wzch@marvell.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@marvell.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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