OMAP3: add comments for erratas i540 and i478 workarounds

Add comments and IDs for the following erratas:
- i540: MPU cannot exit from Standby,
- i478: Unexpected Cold-Reset is generated when device is coming
   back from OFF mode

Signed-off-by: Jean Pihet <j-pihet@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/arch/arm/mach-omap2/irq.c b/arch/arm/mach-omap2/irq.c
index 32eeabe9d2ab..85bf8ca95fd3 100644
--- a/arch/arm/mach-omap2/irq.c
+++ b/arch/arm/mach-omap2/irq.c
@@ -284,7 +284,10 @@ void omap3_intc_suspend(void)
 
 void omap3_intc_prepare_idle(void)
 {
-        /* Disable autoidle as it can stall interrupt controller */
+        /*
+         * Disable autoidle as it can stall interrupt controller,
+         * cf. errata ID i540 for 3430 (all revisions up to 3.1.x)
+         */
         intc_bank_write_reg(0, &irq_banks[0], INTC_SYSCONFIG);
 }