oprofile and ARM A9 hardware counter

[Ming Lei]

On Wed, Apr 4, 2012 at 7:29 AM, Paul Walmsley <paul at pwsan.com> wrote:
> Hi
>
> On Tue, 3 Apr 2012, Kevin Hilman wrote:
>
>> Indeed, like you, I have to change the EMU clock domain to SWSUP[1] in
>> order to see any interrupts and see anything in perf top.  This isn't
>> really a mergeable workaround, so I'll look into this a little closer
>> with Santosh to see what we can do once we fully understand the HW
>> problem.
>
> Part of the problem is that the clockdomain data for the emu_sys
> clockdomain is wrong.  Here's something to try to fix it.  It might just
> be enough to get it to work.
>
> - Paul
>
> From: Paul Walmsley <paul at pwsan.com>
> Date: Tue, 3 Apr 2012 17:13:48 -0600
> Subject: [PATCH] ARM: OMAP44xx: clockdomain data: correct the emu_sys_clkdm
>  CLKTRCTRL data
>
> According to the 4430 ES2.0 TRM vX Table 3-744 "CM_EMU_CLKSTCTRL",
> the emu_sys clockdomain data in mainline is incorrect.
>
> The emu_sys clockdomain does not support the DISABLE_AUTO state, and
> instead it supports the FORCE_WAKEUP state.
>
> Signed-off-by: Paul Walmsley <paul at pwsan.com>
> Cc: Benoît Cousson <b-cousson at ti.com>
> Cc: Kevin Hilman <khilman at ti.com>
> Cc: Santosh Shilimkar <santosh.shilimkar at ti.com>
> Cc: Ming Lei <ming.lei at canonical.com>
> ---
>  arch/arm/mach-omap2/clockdomains44xx_data.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/arm/mach-omap2/clockdomains44xx_data.c b/arch/arm/mach-omap2/clockdomains44xx_data.c
> index 9299ac2..bd7ed13 100644
> --- a/arch/arm/mach-omap2/clockdomains44xx_data.c
> +++ b/arch/arm/mach-omap2/clockdomains44xx_data.c
> @@ -390,7 +390,7 @@ static struct clockdomain emu_sys_44xx_clkdm = {
>        .prcm_partition   = OMAP4430_PRM_PARTITION,
>        .cm_inst          = OMAP4430_PRM_EMU_CM_INST,
>        .clkdm_offs       = OMAP4430_PRM_EMU_CM_EMU_CDOFFS,
> -       .flags            = CLKDM_CAN_HWSUP,
> +       .flags            = CLKDM_CAN_ENABLE_AUTO | CLKDM_CAN_FORCE_WAKEUP,

I tested the patch just now, but unfortunately, the change still doesn't make
PMU to generate IRQs.

Mark the flags as CLKDM_CAN_SWSUP may work, but PMU will stop producing
IRQs after resuming from suspend.


Thanks
--
Ming Lei