armv7: stronger barrier for cache-maintenance operations

set-way operations need a DSB after them to ensure the
operation is complete. DMB may not be enough. Use DSB
after all operations instead of DMB.

Signed-off-by: Aneesh V <aneesh@ti.com>

diff --git a/arch/arm/cpu/armv7/cache_v7.c b/arch/arm/cpu/armv7/cache_v7.c
index 3e1e1bf..665f025 100644 (file)
--- a/arch/arm/cpu/armv7/cache_v7.c
+++ b/arch/arm/cpu/armv7/cache_v7.c
@@ -81,8 +81,8 @@ static void v7_inval_dcache_level_setway(u32 level, u32 num_sets,
                                        : : "r" (setway));
                }
        }
-       /* DMB to make sure the operation is complete */
-       CP15DMB;
+       /* DSB to make sure the operation is complete */
+       CP15DSB;
 }
 
 static void v7_clean_inval_dcache_level_setway(u32 level, u32 num_sets,
@@ -108,8 +108,8 @@ static void v7_clean_inval_dcache_level_setway(u32 level, u32 num_sets,
                                        : : "r" (setway));
                }
        }
-       /* DMB to make sure the operation is complete */
-       CP15DMB;
+       /* DSB to make sure the operation is complete */
+       CP15DSB;
 }
 
 static void v7_maint_dcache_level_setway(u32 level, u32 operation)
@@ -227,8 +227,8 @@ static void v7_dcache_maint_range(u32 start, u32 stop, u32 range_op)
                break;
        }
 
-       /* DMB to make sure the operation is complete */
-       CP15DMB;
+       /* DSB to make sure the operation is complete */
+       CP15DSB;
 }
 
 /* Invalidate TLB */