Hi Grant, Rob,
On Sun, 24 Nov 2013, Grant Likely wrote:
> On Fri, 22 Nov 2013 17:50:35 -0800, Tony Lindgren <tony@xxxxxxxxxxx> wrote:
> > * Tony Lindgren <tony@xxxxxxxxxxx> [131122 17:16]:
> > > * Tony Lindgren <tony@xxxxxxxxxxx> [131122 17:09]:
> > > > * Russell King - ARM Linux <linux@xxxxxxxxxxxxxxxx> [131122 16:56]:
> > > > > On Fri, Nov 22, 2013 at 04:43:35PM -0800, Tony Lindgren wrote:
> > > > > > + /* See of_device_resource_notify for populating interrupts */
> > > > > > + for (i = 0; i < num_irq; i++, res++) {
> > > > > > + res->flags = IORESOURCE_IRQ;
> > > > > > + res->start = -EPROBE_DEFER;
> > > > > > + res->end = -EPROBE_DEFER;
> > > > >
> > > > > NAK. Definitely a bad idea to start introducing magic values other into
> > > > > resources. Please don't do this.
> > > >
> > > > Do you have any better ideas on how to sort out this issue then?
> > >
> > > I guess we could allocate all the resources lazily here, I'll take a look
> > > at that.
> >
> > Here's a version that allocates the resources lazily with the notifier.
> > Seems to boot, need to play with it a bit more though to make sure we're
> > not overwriting resources for any legacy devices.
>
> Blurg. Using a notifier really feels like we don't have a good handle on
> a reasonable solution yet. Basically it means we're hooking into the
> driver core without /looking/ like we're hooking into the driver core. I
> don't think this is any better, but I don't have a better suggestion at
> the moment. :-(
Unfortunately this patch, or something that accomplishes the same results,
is somewhat high-priority for us on OMAP. OMAP37xx got prematurely
converted to DT booting, and now dynamic power management is broken:
http://marc.info/?l=linux-arm-kernel&m=138658294830408&w=2
Tony writes that this patch is one of the two patches needed to get things
working again:
http://marc.info/?l=linux-arm-kernel&m=138660942506846&w=2
Is it possible to get this patch, or something similar, merged for
v3.13-rc?
Once something like PM is broken, it's pretty easy for other broken
patches to make it into the tree, since it becomes very difficult to test
without turning into a maintainer denial-of-service attack.
- Paul
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