[PATCH V2 08/10] ARM: OMAP4: Prevent EMU power domain transitioning to OFF when in-use

[Will Deacon]

Jon,

[cutting out realms of context!]

On Fri, Jul 13, 2012 at 02:54:59PM +0100, Jon Hunter wrote:
> Another proposal I also thought of is re-working the flags to describe
> the HW mode to be used when turning on the CLKDM, when the CLKDM is
> active and when the CLKDM is shut down. So instead of saying what modes
> the CLKDM supports, specify what modes should be used for pre-ON (i.e.
> turn ON), ON and OFF. Right now software is trying to decide for us by
> what is available (which is ideal) but makes working around such nuances
> a little more painful.
> 
> By the way, I did do some testing on OMAP3, but I don't recall now
> whether I was having such problems with OMAP3. I need to go back and
> test perf again on OMAP3 to see if such a flag is needed.

If you do test on OMAP3, please kill the OMAP3_EMU option as I think this
has the effect of keeping the EMU power domain up via the etm code (look at
etb_probe).

Will

---8<---

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index a91009c..d02054c 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -1139,8 +1139,7 @@ config XSCALE_PMU
        default y
 
 config CPU_HAS_PMU
-       depends on (CPU_V6 || CPU_V6K || CPU_V7 || XSCALE_PMU) && \
-                  (!ARCH_OMAP3 || OMAP3_EMU)
+       depends on (CPU_V6 || CPU_V6K || CPU_V7 || XSCALE_PMU)
        default y
        bool