Re: [PATCH] save and restore etm state across core OFF modes

Tony Lindgren
2010-01-12T21:04:00Z

* Nishanth Menon <nm@ti.com> [100112 09:31]:
> Alexander Shishkin had written, on 01/12/2010 11:30 AM, the following:
> >On Tue, Jan 12, 2010 at 11:13:13 -0600, Nishanth Menon wrote:
> >>Alexander Shishkin had written, on 01/12/2010 11:04 AM, the following:
>
> >>>diff --git a/arch/arm/mach-omap2/sleep34xx.S b/arch/arm/mach-omap2/sleep34xx.S
> >>>index 69521be..0a5ec86 100644
> >>>--- a/arch/arm/mach-omap2/sleep34xx.S
> >>>+++ b/arch/arm/mach-omap2/sleep34xx.S
> [...]
> >>> /* Store current cpsr*/
> >>> mrs r2, cpsr
> >>> stmia r8!, {r2}
> >>>@@ -520,6 +616,7 @@ clean_caches:
> >>> cmp r9, #1 /* Check whether L2 inval is required or not*/
> >>> bne skip_l2_inval
> >>>clean_l2:
> >>>+#if 0
> >>my aversion to #if 0 kicks in here :(.. do we have an alternative
> >>like using the CONFIG_ENABLE_OFF_MODE_JTAG_ETM_DEBUG or something
> >>else?
> >
> >Fair enough. I could replace it with "#if !defined(...)" as the first
> >thing that comes to mind. This way it will only take disabling the
> >config option to catch any possible regressions in between. Does this
> >sound reasonable?
> sounds ok to me.. unless folks have ideas coz of clean_l2 label..
> more comments might be useful before a rev2 of the patch..

The best solution would be to be able to toggle this via sysfs or
debugfs by swapping the sram code for idle loop when JTAG support
is needed.

Regards,

Tony