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SubjectRe: [PATCH] fakephp: Allocate PCI resources before adding the device
Date
Trent Piepho wrote:
> On Wed, 26 Nov 2008, Darrick J. Wong wrote:
> > On Wed, Nov 26, 2008 at 03:55:35PM -0700, Alex Chiang wrote:
> > > > Maybe it's different on powerpc then? My pseudo-hotplugable device
> > > > is also the only thing connected to the PCI-E host bus controller.
> > > > At boot the controller is empty and so I think some code to enable
> > > > its BARs gets skipped. But without the pci_enable_device(), I get
> > > > this:
> > > >
> > > > 01:00.0 Signal processing controller: Freescale Semiconductor Inc
> > > > Aurora Nexus Trace Interface Flags: fast devsel, IRQ 255
> > > > Memory at 40000000 (64-bit, prefetchable) [disabled]
> > > > [size=4K]
> >
> > Are you referring to this? ^^^^^^^^^^
> >
> > Without seeing the raw dump of the PCI config space, it looks to me like
> > the memory space enable bit of the PCICMD register is unset. Probably
> > the device driver should call pci_enable_device() at init time, though I
> > suppose you did say earlier that there is no driver.
>
> Yes, that's it. It seems like since the BARs are normally enabled after a
> device is scanned at boot time that they should also be enabled when a
> device is found by a fakephp rescan. So I thought it seemed reasonable to
> put pci_enable_device() in fakephp.

No, pci_enable_device() will be called by the device driver. The hotplug
drivers have nothing to do with that.

Eike
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