3 files changed, 36 insertions, 1 deletions

diff --git a/arch/arm/mach-omap2/pm.h b/arch/arm/mach-omap2/pm.h
index 8d9aa3e0f635..5e0bee961850 100644
--- a/arch/arm/mach-omap2/pm.h
+++ b/arch/arm/mach-omap2/pm.h
@@ -90,8 +90,10 @@ extern unsigned int omap34xx_cpu_suspend_sz;
 #if defined(CONFIG_PM) && defined(CONFIG_ARCH_OMAP3)
 extern u16 pm34xx_errata;
 #define IS_PM34XX_ERRATUM(id)           (pm34xx_errata & (id))
+extern void enable_omap3630_toggle_l2_on_restore(void);
 #else
 #define IS_PM34XX_ERRATUM(id)           0
+static inline void enable_omap3630_toggle_l2_on_restore(void) { }
 #endif          /* defined(CONFIG_PM) && defined(CONFIG_ARCH_OMAP3) */
 
 #endif
diff --git a/arch/arm/mach-omap2/pm34xx.c b/arch/arm/mach-omap2/pm34xx.c
index 7dbc00005464..96e309d44e14 100644
--- a/arch/arm/mach-omap2/pm34xx.c
+++ b/arch/arm/mach-omap2/pm34xx.c
@@ -996,8 +996,11 @@ void omap_push_sram_idle(void)
 
 static void __init pm_errata_configure(void)
 {
-        if (cpu_is_omap3630())
+        if (cpu_is_omap3630()) {
                 pm34xx_errata |= PM_RTA_ERRATUM_i608;
+                /* Enable the l2 cache toggling in sleep logic */
+                enable_omap3630_toggle_l2_on_restore();
+        }
 }
 
 static int __init omap3_pm_init(void)
diff --git a/arch/arm/mach-omap2/sleep34xx.S b/arch/arm/mach-omap2/sleep34xx.S
index 4abf447fddfc..50887c75a3b8 100644
--- a/arch/arm/mach-omap2/sleep34xx.S
+++ b/arch/arm/mach-omap2/sleep34xx.S
@@ -111,6 +111,19 @@ ENTRY(get_omap3630_restore_pointer_sz)
         .word   . - get_omap3630_restore_pointer
 
         .text
+/*
+ * L2 cache needs to be toggled for stable OFF mode functionality on 3630.
+ * This function sets up a fflag that will allow for this toggling to take
+ * place on 3630. Hopefully some version in the future maynot need this
+ */
+ENTRY(enable_omap3630_toggle_l2_on_restore)
+        stmfd   sp!, {lr}     @ save registers on stack
+        /* Setup so that we will disable and enable l2 */
+        mov     r1, #0x1
+        str     r1, l2dis_3630
+        ldmfd   sp!, {pc}     @ restore regs and return
+
+        .text
 /* Function call to get the restore pointer for for ES3 to resume from OFF */
 ENTRY(get_es3_restore_pointer)
         stmfd   sp!, {lr}       @ save registers on stack
@@ -283,6 +296,14 @@ restore:
         moveq   r9, #0x3        @ MPU OFF => L1 and L2 lost
         movne   r9, #0x1        @ Only L1 and L2 lost => avoid L2 invalidation
         bne     logic_l1_restore
+
+        ldr     r0, l2dis_3630
+        cmp     r0, #0x1        @ should we disable L2 on 3630?
+        bne     skipl2dis
+        mrc     p15, 0, r0, c1, c0, 1
+        bic     r0, r0, #2      @ disable L2 cache
+        mcr     p15, 0, r0, c1, c0, 1
+skipl2dis:
         ldr     r0, control_stat
         ldr     r1, [r0]
         and     r1, #0x700
@@ -343,6 +364,13 @@ smi:    .word 0xE1600070		@ Call SMI monitor (smieq)
         mov     r12, #0x2
         .word 0xE1600070        @ Call SMI monitor (smieq)
 logic_l1_restore:
+        ldr     r1, l2dis_3630
+        cmp     r1, #0x1        @ Do we need to re-enable L2 on 3630?
+        bne     skipl2reen
+        mrc     p15, 0, r1, c1, c0, 1
+        orr     r1, r1, #2      @ re-enable L2 cache
+        mcr     p15, 0, r1, c1, c0, 1
+skipl2reen:
         mov     r1, #0
         /* Invalidate all instruction caches to PoU
          * and flush branch target cache */
@@ -679,6 +707,8 @@ control_mem_rta:
         .word   CONTROL_MEM_RTA_CTRL
 kernel_flush:
         .word v7_flush_dcache_all
+l2dis_3630:
+        .word 0
         /*
          * When exporting to userspace while the counters are in SRAM,
          * these 2 words need to be at the end to facilitate retrival!