[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-Id: <200811281942.31754.eike-kernel@sf-tec.de>
Date: Fri, 28 Nov 2008 19:42:20 +0100
From: Rolf Eike Beer <eike-kernel@...tec.de>
To: Trent Piepho <xyzzy@...akeasy.org>
Cc: "Darrick J. Wong" <djwong@...ibm.com>,
Alex Chiang <achiang@...com>,
"linux-kernel" <linux-kernel@...r.kernel.org>,
Jesse Barnes <jbarnes@...tuousgeek.org>,
"linux-pci" <linux-pci@...r.kernel.org>
Subject: Re: [PATCH] fakephp: Allocate PCI resources before adding the device
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
Download attachment "signature.asc " of type "application/pgp-signature" (198 bytes)
Powered by blists - more mailing lists