linux-kernel - Re: [PATCH] PCI: also read revision ID for sparc64, ppc, read class at the same time

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Message-ID: <20070622194651.GB27917@suse.de>
Date:	Fri, 22 Jun 2007 12:46:51 -0700
From:	Greg KH <gregkh@...e.de>
To:	"Kok, Auke" <auke-jan.h.kok@...el.com>
Cc:	linux-pci@...ey.karlin.mff.cuni.cz,
	Grant Grundler <grundler@...isc-linux.org>,
	linux-kernel@...r.kernel.org, davem@...emloft.net
Subject: Re: [PATCH] PCI: also read revision ID for sparc64, ppc, read
	class at the same time

On Fri, Jun 22, 2007 at 10:12:55AM -0700, Kok, Auke wrote:
> 
>  Grant Grundler wrote:
> > On Sat, Jun 09, 2007 at 01:12:21PM -0700, Auke Kok wrote:
> >> Since the PCI bus class and revision are in the same dword, we
> >> can fill in both in the same read.
> >>
> >> Other non-x86 arches use different methods to fill in these values,
> >> make sure to adjust those too.
> > Yeah, this looks good to me.
> > I didn't know ppc  and sparc had their own methods for device discovery.
> > Acked-by: Grant Grundler <grundler@...isc-linux.org>
> > thanks,
> > grant
> >> Signed-off-by: Auke Kok <auke-jan.h.kok@...el.com>
> >> ---
> >>
> >>  arch/powerpc/kernel/pci_64.c |    2 ++
> >>  arch/sparc64/kernel/pci.c    |    1 +
> >>  drivers/pci/probe.c          |    4 +---
> >>  3 files changed, 4 insertions(+), 3 deletions(-)
> >>
> >> diff --git a/arch/powerpc/kernel/pci_64.c b/arch/powerpc/kernel/pci_64.c
> >> index 249cca2..b2c55ca 100644
> >> --- a/arch/powerpc/kernel/pci_64.c
> >> +++ b/arch/powerpc/kernel/pci_64.c
> >> @@ -367,8 +367,10 @@ struct pci_dev *of_create_pci_dev(struct device_node 
> >> *node,
> >>  	sprintf(pci_name(dev), "%04x:%02x:%02x.%d", pci_domain_nr(bus),
> >>  		dev->bus->number, PCI_SLOT(devfn), PCI_FUNC(devfn));
> >>  	dev->class = get_int_prop(node, "class-code", 0);
> >> +	dev->revision = get_int_prop(node, "revision-id", 0);
> >>   	DBG("    class: 0x%x\n", dev->class);
> >> +	DBG("    revision: 0x%x\n", dev->revision);
> >>   	dev->current_state = 4;		/* unknown power state */
> >>  	dev->error_state = pci_channel_io_normal;
> >> diff --git a/arch/sparc64/kernel/pci.c b/arch/sparc64/kernel/pci.c
> >> index 38a32bc..759cc20 100644
> >> --- a/arch/sparc64/kernel/pci.c
> >> +++ b/arch/sparc64/kernel/pci.c
> >> @@ -448,6 +448,7 @@ struct pci_dev *of_create_pci_dev(struct pci_pbm_info 
> >> *pbm,
> >>  		 */
> >>  		pci_read_config_dword(dev, PCI_CLASS_REVISION, &class);
> >>  		dev->class = class >> 8;
> >> +		dev->revision = class & 0xff;
> >>   		sprintf(pci_name(dev), "%04x:%02x:%02x.%d", pci_domain_nr(bus),
> >>  			dev->bus->number, PCI_SLOT(devfn), PCI_FUNC(devfn));
> >> diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
> >> index 0fdb71d..a574b7f 100644
> >> --- a/drivers/pci/probe.c
> >> +++ b/drivers/pci/probe.c
> >> @@ -702,6 +702,7 @@ static int pci_setup_device(struct pci_dev * dev)
> >>  		dev->bus->number, PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn));
> >>   	pci_read_config_dword(dev, PCI_CLASS_REVISION, &class);
> >> +	dev->revision = class & 0xff;
> >>  	class >>= 8;				    /* upper 3 bytes */
> >>  	dev->class = class;
> >>  	class >>= 8;
> >> @@ -918,9 +919,6 @@ pci_scan_device(struct pci_bus *bus, int devfn)
> >>  	dev->cfg_size = pci_cfg_space_size(dev);
> >>  	dev->error_state = pci_channel_io_normal;
> >>  -	/* read the PCI revision: 1 byte */
> >> -	pci_read_config_byte(dev, PCI_REVISION_ID, &dev->revision);
> >> -
> >>  	/* Assume 32-bit PCI; let 64-bit PCI cards (which are far rarer)
> >>  	   set this higher, assuming the system even supports it.  */
> >>  	dev->dma_mask = 0xffffffff;
> 
> 
>  Greg, did you end up pulling this patch? If you pulled my first patch, then 
>  you *must* pull this one too. Otherwise a lot of drivers will fail on 
>  ppc/sparc64.

Care to merge this with your first one and resend it so that no one
doing a 'git bisect' will hit a bad point in the tree?

If you do that, a resend of all of the patches in this series would be
wise, to make sure that I didn't mess up in applying them.

thanks,

greg k-h
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