Port power management places a lot of trust in the firmware api tables.
Set this flag if it turns out that trust was misplaced.
Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
---
Documentation/kernel-parameters.txt | 4 ++++
drivers/usb/core/usb-acpi.c | 7 +++++++
2 files changed, 11 insertions(+), 0 deletions(-)
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index fcbb736d55fe..bd6fb49c2a66 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -3240,6 +3240,10 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
USB_REQ_GET_DESCRIPTOR request in milliseconds
(default 5000 = 5.0 seconds).
+ usbcore.noacpi= [USB] Disable port power management, connection
+ type reporting, and any other USB functionality
+ enabled by ACPI.
+
usbhid.mousepoll=
[USBHID] The interval which mice are to be polled at.
diff --git a/drivers/usb/core/usb-acpi.c b/drivers/usb/core/usb-acpi.c
index fab4a8288803..0886fab67e99 100644
--- a/drivers/usb/core/usb-acpi.c
+++ b/drivers/usb/core/usb-acpi.c
@@ -21,6 +21,9 @@
#include "hub.h"
#include "usb-platform.h"
+static bool noacpi;
+module_param(noacpi, bool, 0444);
+
/**
* usb_acpi_power_manageable - check whether usb port has
* acpi power resource.
@@ -284,6 +287,10 @@ static struct acpi_bus_type usb_acpi_bus = {
int usb_acpi_register(void)
{
+ if (noacpi) {
+ pr_info("%s: USB ACPI support disabled\n", usbcore_name);
+ return 0;
+ }
return register_acpi_bus_type(&usb_acpi_bus);
}
--
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