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ACPI updates for v4.12-rc3

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- Revert a 4.11 commit related to the ACPI-based handling of laptop
    lids that made changes incompatible with existing user space
    stacks and broke things there (Lv Zheng).
 
  - Add .gitignore to the ACPI tools directory (Prarit Bhargava).
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Merge tag 'acpi-4.12-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull ACPI fixes from Rafael Wysocki:
 "These revert a 4.11 change that turned out to be problematic and add a
  .gitignore file.

  Specifics:

   - Revert a 4.11 commit related to the ACPI-based handling of laptop
     lids that made changes incompatible with existing user space stacks
     and broke things there (Lv Zheng).

   - Add .gitignore to the ACPI tools directory (Prarit Bhargava)"

* tag 'acpi-4.12-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  Revert "ACPI / button: Remove lid_init_state=method mode"
  tools/power/acpi: Add .gitignore file
This commit is contained in:
Linus Torvalds 2017-05-22 19:26:33 -07:00
commit 74a9e7dbbc
3 changed files with 25 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
Documentation/acpi/acpi-lid.txt
View File

@ -59,20 +59,28 @@ button driver uses the following 3 modes in order not to trigger issues.
If the userspace hasn't been prepared to ignore the unreliable "opened"
events and the unreliable initial state notification, Linux users can use
the following kernel parameters to handle the possible issues:
A. button.lid_init_state=open:
A. button.lid_init_state=method:
When this option is specified, the ACPI button driver reports the
initial lid state using the returning value of the _LID control method
and whether the "opened"/"closed" events are paired fully relies on the
firmware implementation.
This option can be used to fix some platforms where the returning value
of the _LID control method is reliable but the initial lid state
notification is missing.
This option is the default behavior during the period the userspace
isn't ready to handle the buggy AML tables.
B. button.lid_init_state=open:
When this option is specified, the ACPI button driver always reports the
initial lid state as "opened" and whether the "opened"/"closed" events
are paired fully relies on the firmware implementation.
This may fix some platforms where the returning value of the _LID
control method is not reliable and the initial lid state notification is
missing.
This option is the default behavior during the period the userspace
isn't ready to handle the buggy AML tables.
If the userspace has been prepared to ignore the unreliable "opened" events
and the unreliable initial state notification, Linux users should always
use the following kernel parameter:
B. button.lid_init_state=ignore:
C. button.lid_init_state=ignore:
When this option is specified, the ACPI button driver never reports the
initial lid state and there is a compensation mechanism implemented to
ensure that the reliable "closed" notifications can always be delievered

9
drivers/acpi/button.c
View File

@ -57,6 +57,7 @@
#define ACPI_BUTTON_LID_INIT_IGNORE 0x00
#define ACPI_BUTTON_LID_INIT_OPEN 0x01
#define ACPI_BUTTON_LID_INIT_METHOD 0x02
#define _COMPONENT ACPI_BUTTON_COMPONENT
ACPI_MODULE_NAME("button");
@ -376,6 +377,9 @@ static void acpi_lid_initialize_state(struct acpi_device *device)
case ACPI_BUTTON_LID_INIT_OPEN:
(void)acpi_lid_notify_state(device, 1);
break;
case ACPI_BUTTON_LID_INIT_METHOD:
(void)acpi_lid_update_state(device);
break;
case ACPI_BUTTON_LID_INIT_IGNORE:
default:
break;
@ -560,6 +564,9 @@ static int param_set_lid_init_state(const char *val, struct kernel_param *kp)
if (!strncmp(val, "open", sizeof("open") - 1)) {
lid_init_state = ACPI_BUTTON_LID_INIT_OPEN;
pr_info("Notify initial lid state as open\n");
} else if (!strncmp(val, "method", sizeof("method") - 1)) {
lid_init_state = ACPI_BUTTON_LID_INIT_METHOD;
pr_info("Notify initial lid state with _LID return value\n");
} else if (!strncmp(val, "ignore", sizeof("ignore") - 1)) {
lid_init_state = ACPI_BUTTON_LID_INIT_IGNORE;
pr_info("Do not notify initial lid state\n");
@ -573,6 +580,8 @@ static int param_get_lid_init_state(char *buffer, struct kernel_param *kp)
switch (lid_init_state) {
case ACPI_BUTTON_LID_INIT_OPEN:
return sprintf(buffer, "open");
case ACPI_BUTTON_LID_INIT_METHOD:
return sprintf(buffer, "method");
case ACPI_BUTTON_LID_INIT_IGNORE:
return sprintf(buffer, "ignore");
default:

4
tools/power/acpi/.gitignore vendored Normal file
View File

@ -0,0 +1,4 @@
acpidbg
acpidump
ec
include