[PATCH 1/2] powerpc/PCI: Use PCI_UNKNOWN for unknown power state

[Bjorn Helgaas]

On Mon, May 20, 2013 at 5:19 PM, Bjorn Helgaas <bhelgaas at google.com> wrote:
> Previously we initialized dev->current_state to 4 (PCI_D3cold), but I think
> we wanted PCI_UNKNOWN (5) here based on the comment and the fact that the
> generic version of this code, pci_setup_device(), uses PCI_UNKNOWN.
>
> Signed-off-by: Bjorn Helgaas <bhelgaas at google.com>
> ---
>  arch/powerpc/kernel/pci_of_scan.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/powerpc/kernel/pci_of_scan.c b/arch/powerpc/kernel/pci_of_scan.c
> index 2a67e9b..d2d407d 100644
> --- a/arch/powerpc/kernel/pci_of_scan.c
> +++ b/arch/powerpc/kernel/pci_of_scan.c
> @@ -165,7 +165,7 @@ struct pci_dev *of_create_pci_dev(struct device_node *node,
>         pr_debug("    class: 0x%x\n", dev->class);
>         pr_debug("    revision: 0x%x\n", dev->revision);
>
> -       dev->current_state = 4;         /* unknown power state */
> +       dev->current_state = PCI_UNKNOWN;       /* unknown power state */

If you're interested in the archaeology of this, I think it was first
introduced by 4267292b0 in 2005 for powerpc and subsequently copied
into sparc by a2fb23af1 in 2007.

Prior to the addition of PCI_UNKNOWN, pci_setup_device() set
current_state to 4, so I think 4267292b0 probably just copied that
code before 3fe9d19f9 added PCI_UNKNOWN and changed the initialization
in pci_setup_device().

>         dev->error_state = pci_channel_io_normal;
>         dev->dma_mask = 0xffffffff;
>
>