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Date: Thu, 04 Jul 2013 14:36 +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 Thursday, July 04, 2013 11:58:44 AM Mika Westerberg wrote:
> On Wed, Jul 03, 2013 at 11:40:42PM +0200, Rafael J. Wysocki wrote:
> > 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?
>
> Sure we can. How about something like the patch below?
Well, it goes into the right (to me) direction. :-)
Some comments below.
> From: Mika Westerberg <mika.westerberg@...ux.intel.com>
> Subject: [PATCH] PCI: acpiphp: workaround for Thunderbolt on Acer Aspire S5
>
> The acpiphp driver finds out whether the device is removable by checking
> whether it has _RMV method directly behind it (and if it returns 1).
> However, at least on Acer Aspire S5 with Thunderbolt host router has this
> method placed behind a device called EPUP (endpoint upstream port?) and not
> in the usual place expected by the acpiphp driver. The ASL code below shows
> how this is done on that machine:
>
> Device (RP05)
> {
> ...
> Device (HRUP)
> {
> Name (_ADR, Zero)
> Name (_PRW, Package (0x02)
> {
> 0x09,
> 0x04
> })
> Device (HRDN)
> {
> Name (_ADR, 0x00040000)
> Name (_PRW, Package (0x02)
> {
> 0x09,
> 0x04
> })
> Device (EPUP)
> {
> Name (_ADR, Zero)
> Method (_RMV, 0, NotSerialized)
> {
> Return (One)
> }
> }
> }
> }
> ...
>
> Fix this by adding a DMI quirk for the Acer Aspire S5 machine that gives an
> alternative path to the _RMV method.
>
> 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 | 57 ++++++++++++++++++++++++++++++++++++----
> 1 file changed, 52 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/pci/hotplug/acpi_pcihp.c b/drivers/pci/hotplug/acpi_pcihp.c
> index 2a47e82..99fccf3 100644
> --- a/drivers/pci/hotplug/acpi_pcihp.c
> +++ b/drivers/pci/hotplug/acpi_pcihp.c
> @@ -33,6 +33,7 @@
> #include <linux/acpi.h>
> #include <linux/pci-acpi.h>
> #include <linux/slab.h>
> +#include <linux/dmi.h>
>
> #define MY_NAME "acpi_pcihp"
>
> @@ -408,21 +409,67 @@ got_one:
> }
> EXPORT_SYMBOL(acpi_get_hp_hw_control_from_firmware);
>
> +/**
> + * pcihp_is_removable - is the given ACPI device removable
> + * @handle: ACPI handle of the device
> + *
> + * Try to find out whether the given ACPI device is removable by evaluating
> + * its _RMV and returning the result. If we can't find the _RMV directly
> + * under the device use system specific quirks to locate it.
> + */
> +static bool pcihp_is_removable(acpi_handle handle)
> +{
People are generally used to seeing DMI lists outside of functions.
> + static const struct dmi_system_id rmv_paths[] = {
> + {
> + /*
> + * On Acer Aspire S5 the _RMV method for the
> + * Thunderbolt host router upstream port is not
> + * located directly under the device but it is
> + * instead placed a bit deeper in the hierarchy.
> + */
> + .ident = "Acer Aspire S5",
> + .matches = {
> + DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
> + DMI_MATCH(DMI_PRODUCT_NAME, "Aspire S5-391"),
> + },
> + .driver_data = "HRDN.EPUP._RMV",
Use .callback instead? ->
> + },
> + { }
> + };
> + const struct dmi_system_id *id;
> + unsigned long long removable;
> + acpi_status status;
> +
> + status = acpi_evaluate_integer(handle, "_RMV", NULL, &removable);
> + if (ACPI_SUCCESS(status))
> + return !!removable;
> +
> + /* Try system specific quirks */
> + id = dmi_first_match(rmv_paths);
> + if (id && id->driver_data) {
-> And here do
if (id && id->callback)
return id->callback(id);
> + char path[64];
> +
> + strlcpy(path, id->driver_data, sizeof(path));
> + status = acpi_evaluate_integer(handle, path, NULL, &removable);
> + if (ACPI_SUCCESS(status))
> + return !!removable;
> + }
> +
> + return false;
> +}
> +
> static int pcihp_is_ejectable(acpi_handle handle)
> {
> acpi_status status;
> acpi_handle tmp;
> - unsigned long long removable;
> +
> status = acpi_get_handle(handle, "_ADR", &tmp);
> if (ACPI_FAILURE(status))
> return 0;
> status = acpi_get_handle(handle, "_EJ0", &tmp);
> if (ACPI_SUCCESS(status))
> return 1;
> - status = acpi_evaluate_integer(handle, "_RMV", NULL, &removable);
> - if (ACPI_SUCCESS(status) && removable)
> - return 1;
I'd keep the above unchanged and simply add a "platform check" function.
> - return 0;
> + return pcihp_is_removable(handle);
> }
>
> /**
Thanks,
Rafael
--
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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