ARM: pm: only use preallocated page table during resume

Only use the preallocated page table during the resume, not while
suspending.  This avoids the overhead of having to switch unnecessarily
to the resume page table in the suspend path.

Tested-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Tested-by: Shawn Guo <shawn.guo@linaro.org>
Tested-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 10 insertions, 11 deletions

diff --git a/arch/arm/mm/proc-sa1100.S b/arch/arm/mm/proc-sa1100.S
index 52f73fb47ac..7d91545d089 100644
--- a/arch/arm/mm/proc-sa1100.S
+++ b/arch/arm/mm/proc-sa1100.S
@@ -168,20 +168,19 @@ ENTRY(cpu_sa1100_set_pte_ext)
         mov     pc, lr
 
 .globl  cpu_sa1100_suspend_size
-.equ    cpu_sa1100_suspend_size, 4*4
+.equ    cpu_sa1100_suspend_size, 4 * 3
 #ifdef CONFIG_PM_SLEEP
 ENTRY(cpu_sa1100_do_suspend)
-        stmfd   sp!, {r4 - r7, lr}
+        stmfd   sp!, {r4 - r6, lr}
         mrc     p15, 0, r4, c3, c0, 0           @ domain ID
-        mrc     p15, 0, r5, c2, c0, 0           @ translation table base addr
-        mrc     p15, 0, r6, c13, c0, 0          @ PID
-        mrc     p15, 0, r7, c1, c0, 0           @ control reg
-        stmia   r0, {r4 - r7}                   @ store cp regs
-        ldmfd   sp!, {r4 - r7, pc}
+        mrc     p15, 0, r5, c13, c0, 0          @ PID
+        mrc     p15, 0, r6, c1, c0, 0           @ control reg
+        stmia   r0, {r4 - r6}                   @ store cp regs
+        ldmfd   sp!, {r4 - r6, pc}
 ENDPROC(cpu_sa1100_do_suspend)
 
 ENTRY(cpu_sa1100_do_resume)
-        ldmia   r0, {r4 - r7}                   @ load cp regs
+        ldmia   r0, {r4 - r6}                   @ load cp regs
         mov     ip, #0
         mcr     p15, 0, ip, c8, c7, 0           @ flush I+D TLBs
         mcr     p15, 0, ip, c7, c7, 0           @ flush I&D cache
@@ -189,9 +188,9 @@ ENTRY(cpu_sa1100_do_resume)
         mcr     p15, 0, ip, c9, c0, 5           @ allow user space to use RB
 
         mcr     p15, 0, r4, c3, c0, 0           @ domain ID
-        mcr     p15, 0, r5, c2, c0, 0           @ translation table base addr
-        mcr     p15, 0, r6, c13, c0, 0          @ PID
-        mov     r0, r7                          @ control register
+        mcr     p15, 0, r1, c2, c0, 0           @ translation table base addr
+        mcr     p15, 0, r5, c13, c0, 0          @ PID
+        mov     r0, r6                          @ control register
         b       cpu_resume_mmu
 ENDPROC(cpu_sa1100_do_resume)
 #endif