[PATCH v3 4/4] OMAP3/4: iommu: adapt to runtime pm

Ramirez Luna, Omar omar.ramirez at ti.com
Mon Nov 7 13:21:41 EST 2011


On Fri, Nov 4, 2011 at 6:27 PM, Kevin Hilman <khilman at ti.com> wrote:
>> @@ -821,9 +820,7 @@ static irqreturn_t iommu_fault_handler(int irq, void *data)
>>       if (!obj->refcount)
>>               return IRQ_NONE;
>> -     clk_enable(obj->clk);
>>       errs = iommu_report_fault(obj, &da);
>> -     clk_disable(obj->clk);
>>       if (errs == 0)
>>               return IRQ_HANDLED;
> I'm not terribly familiar with this IOMMU code, but this one looks
> suspiciou because you're removing the clock calls but not replacing them
> with runtime PM get/put calls.
> I just want to make sure that's intentional.  If so, you might want to
> add a comment about that to the changelog.

Yes it is intentional, reason is that in order to get an interrupt,
the device should be powered on in advance, right now it is working
because the modules share a common clock so the users of the
omap-iommu indirectly give power to it. However I made another change
to do pm_runtime_get/put on attach/detach so it doesn't rely on others
to keep the clocks on.

I'll add the comment.



More information about the linux-arm-kernel mailing list