ACPI / PM: Allow deeper wakeup power states with no _SxD nor _SxW

BugLink: https://bugs.launchpad.net/bugs/1759511
acpi_dev_pm_get_state() is used to determine the range of allowable
device power states when going into S3 suspend. This is implemented
by executing the _S3D and _S3W ACPI methods.

Linux follows the ACPI spec behaviour in that when _S3D is implemented
and _S3W is not, Linux will not go into a power state deeper than the one
returned by _S3D for a wakeup-enabled device.

However, this same logic is being applied to the case when neither
_S3D nor _S3W are present, and the result is that this function
decides that the device must stay in D0 (fully on) state.

This is breaking USB wakeups on Asus V222GA and Acer XC-830. _S3D and
_S3W are not present, so the USB controller is left in the D0 running
state during S3, and hence it is unable to generate a PME# wake event.

The ACPI spec is unclear on which power states are permissable for
wakeup-enabled devices when both _S3D and _S3W are missing.
However, USB wakeups work fine on these platforms under Windows, where
device manager shows that they are using D3 device state for the USB
controller in S3.

I assume that the "max = min" clamping done by the code here is
specifically written for the _S3D but no _S3W case. By making the
code true to those conditions, avoiding them on these platforms,
the controller will be put into D3 state and USB wakeups start working.

Additionally I feel that this change makes the code more directly
mirror the wording of the ACPI spec and it's associated lack of clarity.

Thanks to Mathias Nyman for pointing us in the right direction.

Signed-off-by: Daniel Drake <drake@endlessm.com>
Link: http://lkml.kernel.org/r/CAB4CAwf_k-WsF3zL4epm9TKAOu0h=Bv1XhXV_gY3bziOo_NPKA@mail.gmail.com
https://phabricator.endlessm.com/T21410
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
(cherry picked from commit bf8c6184e0c3d4d5e005e085e9f96f478a267b20 git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git linux-next)
Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
Acked-by: Hui Wang <hui.wang@canonical.com>
Acked-by: Stefan Bader <stefan.bader@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>

diff --git a/drivers/acpi/device_pm.c b/drivers/acpi/device_pm.c
index 2ed6935d4483bb0139e1ed9cc4cf27854c328c0d..5bb754b1ccb25c14bf9f0150bcfc53bfbda35c6e 100644 (file)
--- a/drivers/acpi/device_pm.c
+++ b/drivers/acpi/device_pm.c
@@ -534,6 +534,7 @@ static int acpi_dev_pm_get_state(struct device *dev, struct acpi_device *adev,
        unsigned long long ret;
        int d_min, d_max;
        bool wakeup = false;
+       bool has_sxd = false;
        acpi_status status;
 
        /*
@@ -572,6 +573,10 @@ static int acpi_dev_pm_get_state(struct device *dev, struct acpi_device *adev,
                        else
                                return -ENODATA;
                }
+
+               if (status == AE_OK)
+                       has_sxd = true;
+
                d_min = ret;
                wakeup = device_may_wakeup(dev) && adev->wakeup.flags.valid
                        && adev->wakeup.sleep_state >= target_state;
@@ -591,7 +596,11 @@ static int acpi_dev_pm_get_state(struct device *dev, struct acpi_device *adev,
                method[3] = 'W';
                status = acpi_evaluate_integer(handle, method, NULL, &ret);
                if (status == AE_NOT_FOUND) {
-                       if (target_state > ACPI_STATE_S0)
+                       /* No _SxW. In this case, the ACPI spec says that we
+                        * must not go into any power state deeper than the
+                        * value returned from _SxD.
+                        */
+                       if (has_sxd && target_state > ACPI_STATE_S0)
                                d_max = d_min;
                } else if (ACPI_SUCCESS(status) && ret <= ACPI_STATE_D3_COLD) {
                        /* Fall back to D3cold if ret is not a valid state. */