ARM: pm: omap34xx: no need to save all registers in sleep34xx.S

The ABI allows called functions to corrupt r0-r3 and ip (r12).  So
its pointless saving these registers in the suspend code - the
calling function will expect them to be corrupted and so won't rely
on their contents after resume.

Reviewed-by: Kevin Hilman <khilman@ti.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>

diff --git a/arch/arm/mach-omap2/sleep34xx.S b/arch/arm/mach-omap2/sleep34xx.S
index 63f1066..9551c7d 100644 (file)
--- a/arch/arm/mach-omap2/sleep34xx.S
+++ b/arch/arm/mach-omap2/sleep34xx.S
@@ -133,7 +133,7 @@ ENDPROC(enable_omap3630_toggle_l2_on_restore)
 /* Function to call rom code to save secure ram context */
        .align  3
 ENTRY(save_secure_ram_context)
-       stmfd   sp!, {r1-r12, lr}       @ save registers on stack
+       stmfd   sp!, {r4 - r11, lr}     @ save registers on stack
        adr     r3, api_params          @ r3 points to parameters
        str     r0, [r3,#0x4]           @ r0 has sdram address
        ldr     r12, high_mask
@@ -152,7 +152,7 @@ ENTRY(save_secure_ram_context)
        nop
        nop
        nop
-       ldmfd   sp!, {r1-r12, pc}
+       ldmfd   sp!, {r4 - r11, pc}
        .align
 sram_phy_addr_mask:
        .word   SRAM_BASE_P
@@ -187,7 +187,7 @@ ENTRY(save_secure_ram_context_sz)
  */
        .align  3
 ENTRY(omap34xx_cpu_suspend)
-       stmfd   sp!, {r0-r12, lr}       @ save registers on stack
+       stmfd   sp!, {r4 - r11, lr}     @ save registers on stack
 
        /*
         * r0 contains CPU context save/restore pointer in sdram
@@ -329,7 +329,7 @@ omap3_do_wfi:
  * == Exit point from non-OFF modes ==
  * ===================================
  */
-       ldmfd   sp!, {r0-r12, pc}       @ restore regs and return
+       ldmfd   sp!, {r4 - r11, pc}     @ restore regs and return
 
 
 /*
@@ -572,7 +572,7 @@ usettbr0:
  * ==============================
  */
 restoremmu_on:
-       ldmfd   sp!, {r0-r12, pc}       @ restore regs and return
+       ldmfd   sp!, {r4 - r11, pc}     @ restore regs and return
 
 
 /*