Re: [PATCH][RFC] PCI: Workaround to enable poweroff on Mac Pro 11

[Chen Yu <yu.c.chen@intel.com>]

On 2016年05月31日 15:00, Yinghai Lu wrote:
> On Mon, May 30, 2016 at 8:24 PM, Chen Yu <yu.c.chen@intel.com> wrote:
>
>> and then in pcibios_assign_resources, 0000:00:1c.0 tries to allocate minimal
>> resource window and then update related base/limit registers:
>>
>> [    0.865342] pci 0000:00:1c.0: bridge window [io  0x1000-0x0fff] to [bus
>> 02] add_size 1000
>> [    0.865343] pci 0000:00:1c.0: bridge window [mem 0x00100000-0x000fffff
>> 64bit pref] to [bus 02] add_size 200000 add_align 100000
>> [    0.865344] pci 0000:00:1c.0: bridge window [mem 0x00100000-0x000fffff]
>> to [bus 02] add_size 200000 add_align 100000
>>
> That is for hotplug bridge, then we could use following instead.
>
> diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
> index ee72ebe..d3ec833 100644
> --- a/drivers/pci/quirks.c
> +++ b/drivers/pci/quirks.c
> @@ -2775,6 +2775,13 @@ static void quirk_hotplug_bridge(struct pci_dev *dev)
>
>   DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_HINT, 0x0020, quirk_hotplug_bridge);
>
> +static void quirk_hotplug_bridge_skip(struct pci_dev *dev)
> +{
> +       dev->is_hotplug_bridge = 0;
> +}
> +
> +DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x8c10,
> quirk_hotplug_bridge_skip);
> +
>   /*
>    * This is a quirk for the Ricoh MMC controller found as a part of
>    * some mulifunction chips.
Good idea, but in this way we might not have io window allocated for 
it?I'm not sure
if this would break wifi,etc, I'll suggest reporters to have a try.

thanks,
Yu