OMAP4430 produces boot warnings
Tomi Valkeinen
tomi.valkeinen at ti.com
Thu Nov 22 08:42:14 EST 2012
On 2012-11-22 14:42, Archit Taneja wrote:
> Hi,
>
> On Thursday 22 November 2012 04:33 AM, Russell King - ARM Linux wrote:
>> This one is nice and long, from last nights boot test. Looks like it was
>> introduced sometime in the last couple of weeks. Full log at:
>>
>> http://www.arm.linux.org.uk/developer/build/result.php?type=boot&idx=518
>>
>> and config:
>> http://www.arm.linux.org.uk/developer/build/file.php?type=config&idx=2786
>
> Doing a bisect results in this commit:
>
> commit 0c7018e232c5526869250e57da8043a86a45b5de
> Author: Rajendra Nayak <rnayak at ti.com>
> Date: Thu Oct 18 12:20:06 2012 +0300
>
> ARM: OMAP4: suspend: Program all domains to retention
>
> Remove the FIXME's in the suspend sequence since
> we now intend to support system level RET support.
>
> Signed-off-by: Rajendra Nayak <rnayak at ti.com>
> Signed-off-by: Tero Kristo <t-kristo at ti.com>
> Reviewed-by: Santosh Shilimkar <santosh.shilimkar at ti.com>
>
> I guess this commit will allow DSS to go to a lower power state. So what
> might be happening is:
>
> - After returning back from the lower power state, the DISPC base
> address register hasn't been restored. Leading to a fetch from a bad
> address. Resulting in an OCP error.
>
> or
>
> - DSS never came back to ON state, and it's not able to access
> registers. I doubt this possibility because we got an OCP error
> interrupt from DISPC.
It seems that the problem is that dispc never restores the context,
because get_ctx_loss_count always returns 1. I enabled pwrdm debug
prints, and pwrdm_get_context_loss_count() always returns 1 for dss,
even if the register contents have obviously been lost.
Does the pwrdm mistakenly think that in RET state the DSS still keeps
the register contents?
Tomi
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