linux-kernel - Re: [PATCH v2 6/8] PCI: acpiphp: workaround for Thunderbolt on Acer Aspire S5

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Date:	Wed, 03 Jul 2013 23:40:42 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Mika Westerberg <mika.westerberg@...ux.intel.com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Yinghai Lu <yinghai@...nel.org>, john.ronciak@...el.com,
	miles.j.penner@...el.com, bruce.w.allan@...el.com,
	Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
	linux-pci@...r.kernel.org, x86@...nel.org
Subject: Re: [PATCH v2 6/8] PCI: acpiphp: workaround for Thunderbolt on Acer Aspire S5

On Wednesday, July 03, 2013 05:04:53 PM Mika Westerberg wrote:
> From: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
> 
> Correct ACPI PCI hotplug imeplementation should have _RMV method in a
> PCI slot (device under pci bridge). In Acer Aspire S5 case we have it
> deeper in hierarchy:
> 
> Device (RP05)
> {
>    // ...
>    Device (HRUP)
>    {
>        // ...
>        Device (HRDN)
>        {
>            // ...
>            Device (EPUP)
>            {
>                // ...
>                Method (_RMV, 0, NotSerialized)  // _RMV: Removal Status
>                {
>                    Return (One)
>                }
>            }
>        }
>    }
> }
> 
> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
> Signed-off-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
> ---
>  drivers/pci/hotplug/acpi_pcihp.c | 13 +++++++++++++
>  1 file changed, 13 insertions(+)
> 
> diff --git a/drivers/pci/hotplug/acpi_pcihp.c b/drivers/pci/hotplug/acpi_pcihp.c
> index 2a47e82..d92ebfb 100644
> --- a/drivers/pci/hotplug/acpi_pcihp.c
> +++ b/drivers/pci/hotplug/acpi_pcihp.c
> @@ -422,6 +422,19 @@ static int pcihp_is_ejectable(acpi_handle handle)
>  	status = acpi_evaluate_integer(handle, "_RMV", NULL, &removable);
>  	if (ACPI_SUCCESS(status) && removable)
>  		return 1;
> +
> +	/*
> +	 * Workaround for Thunderbolt implementation on Acer Aspire S5.
> +	 *
> +	 * Correct ACPI PCI hotplug imeplementation has _RMV method in a PCI
> +	 * slot (device under pci bridge). In Acer Aspire S5 case we have it
> +	 * deeper in hierarchy.
> +	 */
> +	status = acpi_evaluate_integer(handle, "HRDN.EPUP._RMV", NULL,
> +			&removable);

Well, calling stuff like this directly from a general function is kind of ugly.

Can we use something like a quirk instead?  A DMI check or something?

> +	if (ACPI_SUCCESS(status) && removable)
> +		return 1;
> +
>  	return 0;
>  }

Rafael


-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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