With CONFIG_DEBUG_RODATA enabled I started noticing imprecise external aborts on a dm3730 when hitting off idle. These don't seem to happen on 34xx. Pretty much changing anything in the code made these go away, like changing .config options. At first I though it might be an alignment issue in the 36xx specific assembly code in sleep34xx.S, or something related to the recent rodata fixes. But that does not seem to be the case. It seems to be a timing issue instead. Adding few extra nop instructions after the wfi seems to fix the issue. When adding 5 nops, the errors showed up less often. With add ed 6 nops, I don't seem to get them at all any longer. Cc: Grygorii Strashko <grygorii.strashko@xxxxxx> Cc: Nishanth Menon <nm@xxxxxx> Cc: Richard Woodruff <r-woodruff2@xxxxxx> Cc: Tero Kristo <t-kristo@xxxxxx> Signed-off-by: Tony Lindgren <tony@xxxxxxxxxxx> --- Anybody else seen this issue before? --- arch/arm/mach-omap2/sleep34xx.S | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/arch/arm/mach-omap2/sleep34xx.S b/arch/arm/mach-omap2/sleep34xx.S index 1b9f052..0fbaa08 100644 --- a/arch/arm/mach-omap2/sleep34xx.S +++ b/arch/arm/mach-omap2/sleep34xx.S @@ -264,6 +264,12 @@ ENTRY(omap3_do_wfi) nop nop nop + nop + nop + nop + nop + nop + nop /* * This function implements the erratum ID i581 WA: -- 2.7.0 -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
