A-Team_Digital_Solutions/android_kernel_motorola_sm6375
Watch
2
0
Fork
You've already forked android_kernel_motorola_sm6375
 0
mirror of https://github.com/BobTheBlinker/android_kernel_motorola_sm6375.git synced 2026-10-30 03:27:44 -04:00
Code Issues Projects Releases Packages Wiki Activity

ACPI: Fix D3hot v D3cold confusion

Browse source 
Before this patch, ACPI_STATE_D3 incorrectly referenced D3hot
in some places, but D3cold in other places.

After this patch, ACPI_STATE_D3 always means ACPI_STATE_D3_COLD;
and all references to D3hot use ACPI_STATE_D3_HOT.

ACPI's _PR3 method is used to enter both D3hot and D3cold states.
What distinguishes D3hot from D3cold is the presence _PR3
(Power Resources for D3hot)  If these resources are all ON,
then the state is D3hot.  If _PR3 is not present,
or all _PR0 resources for the devices are OFF,
then the state is D3cold.

This patch applies after Linux-3.4-rc1.
A future syntax cleanup may remove ACPI_STATE_D3
to emphasize that it always means ACPI_STATE_D3_COLD.

Signed-off-by: Lin Ming <[email protected]>
Acked-by: Rafael J. Wysocki <[email protected]>
Reviewed-by: Aaron Lu <[email protected]>
Signed-off-by: Len Brown <[email protected]>
This commit is contained in:
Lin Ming 2012-04-23 09:03:49 +08:00 • committed by Len Brown
commit 1cc0c998fd
4 changed files with 14 additions and 16 deletions
Download patch file Download diff file Expand all files Collapse all files

2
drivers/acpi/power.c
View file

@ -631,7 +631,7 @@ int acpi_power_get_inferred_state(struct acpi_device *device, int *state)
* We know a device's inferred power state when all the resources
* required for a given D-state are 'on'.
*/
for (i = ACPI_STATE_D0; i < ACPI_STATE_D3; i++) {
for (i = ACPI_STATE_D0; i < ACPI_STATE_D3_HOT; i++) {
list = &device->power.states[i].resources;
if (list->count < 1)
continue;

17
drivers/acpi/scan.c
View file

@ -869,7 +869,7 @@ static int acpi_bus_get_power_flags(struct acpi_device *device)
/*
* Enumerate supported power management states
*/
for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3; i++) {
for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
struct acpi_device_power_state *ps = &device->power.states[i];
char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
@ -884,21 +884,18 @@ static int acpi_bus_get_power_flags(struct acpi_device *device)
acpi_bus_add_power_resource(ps->resources.handles[j]);
}
/* The exist of _PR3 indicates D3Cold support */
if (i == ACPI_STATE_D3) {
status = acpi_get_handle(device->handle, object_name, &handle);
if (ACPI_SUCCESS(status))
device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1;
}
/* Evaluate "_PSx" to see if we can do explicit sets */
object_name[2] = 'S';
status = acpi_get_handle(device->handle, object_name, &handle);
if (ACPI_SUCCESS(status))
ps->flags.explicit_set = 1;
/* State is valid if we have some power control */
if (ps->resources.count || ps->flags.explicit_set)
/*
* State is valid if there are means to put the device into it.
* D3hot is only valid if _PR3 present.
*/
if (ps->resources.count ||
(ps->flags.explicit_set && i < ACPI_STATE_D3_HOT))
ps->flags.valid = 1;
ps->power = -1; /* Unknown - driver assigned */