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Date: Thu, 4 Jul 2013 11:58:44 +0300
From: Mika Westerberg <mika.westerberg@...ux.intel.com>
To: "Rafael J. Wysocki" <rjw@...k.pl>
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 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?
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)
+{
+ 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",
+ },
+ { }
+ };
+ 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) {
+ 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;
- return 0;
+ return pcihp_is_removable(handle);
}
/**
--
1.8.3.2
--
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