ARM: pm: preserve r4 - r11 across a suspend

Make cpu_suspend()..return function preserve r4 to r11 across a suspend
cycle.  This is in preparation of relieving platform support code from
this task.

Acked-by: Frank Hofmann <frank.hofmann@tomtom.com>
Tested-by: Kevin Hilman <khilman@ti.com>
Acked-by: Jean Pihet <j-pihet@ti.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 3 insertions, 2 deletions

diff --git a/arch/arm/kernel/sleep.S b/arch/arm/kernel/sleep.S
index 0a778c30859b..8dbca93417ff 100644
--- a/arch/arm/kernel/sleep.S
+++ b/arch/arm/kernel/sleep.S
@@ -12,10 +12,11 @@
  *  r1 = v:p offset
  *  r3 = virtual return function
  * Note: sp is decremented to allocate space for CPU state on stack
- * r0-r3,r9,r10,lr corrupted
+ * r0-r3,ip,lr corrupted
  */
 ENTRY(cpu_suspend)
         stmfd   sp!, {r3}
+        stmfd   sp!, {r4 - r11}
         mov     r9, lr
 #ifdef MULTI_CPU
         ldr     r10, =processor
@@ -88,7 +89,7 @@ ENDPROC(cpu_resume_turn_mmu_on)
 cpu_resume_after_mmu:
         str     r5, [r2, r4, lsl #2]    @ restore old mapping
         mcr     p15, 0, r0, c1, c0, 0   @ turn on D-cache
-        ldmfd   sp!, {pc}
+        ldmfd   sp!, {r4 - r11, pc}
 ENDPROC(cpu_resume_after_mmu)
 
 /*