ACPI / PM: Rework device power management to follow ACPI 6

[firefly-linux-kernel-4.4.55.git] / drivers / acpi / scan.c

diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index 69bc0d888c012523d03f15267c3ca75a1d4a10e3..ccf15d754448eca548f470174b4743735e053c87 100644 (file)
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -375,7 +375,11 @@ bool acpi_scan_is_offline(struct acpi_device *adev, bool uevent)
        struct acpi_device_physical_node *pn;
        bool offline = true;
 
-       mutex_lock(&adev->physical_node_lock);
+       /*
+        * acpi_container_offline() calls this for all of the container's
+        * children under the container's physical_node_lock lock.
+        */
+       mutex_lock_nested(&adev->physical_node_lock, SINGLE_DEPTH_NESTING);
 
        list_for_each_entry(pn, &adev->physical_node_list, node)
                if (device_supports_offline(pn->dev) && !pn->dev->offline) {
@@ -1762,15 +1766,9 @@ static void acpi_bus_init_power_state(struct acpi_device *device, int state)
        if (acpi_has_method(device->handle, pathname))
                ps->flags.explicit_set = 1;
 
-       /*
-        * State is valid if there are means to put the device into it.
-        * D3hot is only valid if _PR3 present.
-        */
-       if (!list_empty(&ps->resources)
-           || (ps->flags.explicit_set && state < ACPI_STATE_D3_HOT)) {
+       /* State is valid if there are means to put the device into it. */
+       if (!list_empty(&ps->resources) || ps->flags.explicit_set)
                ps->flags.valid = 1;
-               ps->flags.os_accessible = 1;
-       }
 
        ps->power = -1;         /* Unknown - driver assigned */
        ps->latency = -1;       /* Unknown - driver assigned */
@@ -1806,21 +1804,13 @@ static void acpi_bus_get_power_flags(struct acpi_device *device)
                acpi_bus_init_power_state(device, i);
 
        INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
+       if (!list_empty(&device->power.states[ACPI_STATE_D3_HOT].resources))
+               device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1;
 
-       /* Set defaults for D0 and D3 states (always valid) */
+       /* Set defaults for D0 and D3hot states (always valid) */
        device->power.states[ACPI_STATE_D0].flags.valid = 1;
        device->power.states[ACPI_STATE_D0].power = 100;
-       device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1;
-       device->power.states[ACPI_STATE_D3_COLD].power = 0;
-
-       /* Set D3cold's explicit_set flag if _PS3 exists. */
-       if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set)
-               device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1;
-
-       /* Presence of _PS3 or _PRx means we can put the device into D3 cold */
-       if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set ||
-                       device->power.flags.power_resources)
-               device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible = 1;
+       device->power.states[ACPI_STATE_D3_HOT].flags.valid = 1;
 
        if (acpi_bus_init_power(device))
                device->flags.power_manageable = 0;
@@ -2388,9 +2378,6 @@ static void acpi_default_enumeration(struct acpi_device *device)
        struct list_head resource_list;
        bool is_spi_i2c_slave = false;
 
-       if (!device->pnp.type.platform_id || device->handler)
-               return;
-
        /*
         * Do not enemerate SPI/I2C slaves as they will be enuerated by their
         * respective parents.
@@ -2403,6 +2390,29 @@ static void acpi_default_enumeration(struct acpi_device *device)
                acpi_create_platform_device(device);
 }
 
+static const struct acpi_device_id generic_device_ids[] = {
+       {"PRP0001", },
+       {"", },
+};
+
+static int acpi_generic_device_attach(struct acpi_device *adev,
+                                     const struct acpi_device_id *not_used)
+{
+       /*
+        * Since PRP0001 is the only ID handled here, the test below can be
+        * unconditional.
+        */
+       if (adev->data.of_compatible)
+               acpi_default_enumeration(adev);
+
+       return 1;
+}
+
+static struct acpi_scan_handler generic_device_handler = {
+       .ids = generic_device_ids,
+       .attach = acpi_generic_device_attach,
+};
+
 static int acpi_scan_attach_handler(struct acpi_device *device)
 {
        struct acpi_hardware_id *hwid;
@@ -2428,8 +2438,6 @@ static int acpi_scan_attach_handler(struct acpi_device *device)
                                break;
                }
        }
-       if (!ret)
-               acpi_default_enumeration(device);
 
        return ret;
 }
@@ -2471,6 +2479,9 @@ static void acpi_bus_attach(struct acpi_device *device)
                ret = device_attach(&device->dev);
                if (ret < 0)
                        return;
+
+               if (!ret && device->pnp.type.platform_id)
+                       acpi_default_enumeration(device);
        }
        device->flags.visited = true;
 
@@ -2629,6 +2640,8 @@ int __init acpi_scan_init(void)
        acpi_pnp_init();
        acpi_int340x_thermal_init();
 
+       acpi_scan_add_handler(&generic_device_handler);
+
        mutex_lock(&acpi_scan_lock);
        /*
         * Enumerate devices in the ACPI namespace.