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Subject[PATCH 1/3] PCI Hotplug: workaround for Thunderbolt on Acer Aspire S5
Date
From: "Kirill A. Shutemov" <kirill.shutemov@linux.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@linux.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);
+ if (ACPI_SUCCESS(status) && removable)
+ return 1;
+
return 0;
}

--
1.7.10.4


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