diff options
Diffstat (limited to 'drivers/acpi')
| -rw-r--r-- | drivers/acpi/acpi_amba.c | 5 | ||||
| -rw-r--r-- | drivers/acpi/acpi_apd.c | 5 | ||||
| -rw-r--r-- | drivers/acpi/acpi_cmos_rtc.c | 5 | ||||
| -rw-r--r-- | drivers/acpi/acpi_configfs.c | 5 | ||||
| -rw-r--r-- | drivers/acpi/acpi_dbg.c | 5 | ||||
| -rw-r--r-- | drivers/acpi/acpi_lpit.c | 7 | ||||
| -rw-r--r-- | drivers/acpi/acpi_lpss.c | 5 | ||||
| -rw-r--r-- | drivers/acpi/acpi_platform.c | 5 | ||||
| -rw-r--r-- | drivers/acpi/acpi_pnp.c | 5 | ||||
| -rw-r--r-- | drivers/acpi/acpi_processor.c | 5 | ||||
| -rw-r--r-- | drivers/acpi/acpi_watchdog.c | 5 | ||||
| -rw-r--r-- | drivers/acpi/arm64/gtdt.c | 5 | ||||
| -rw-r--r-- | drivers/acpi/bgrt.c | 5 | ||||
| -rw-r--r-- | drivers/acpi/device_pm.c | 71 | ||||
| -rw-r--r-- | drivers/acpi/dptf/int340x_thermal.c | 5 | ||||
| -rw-r--r-- | drivers/acpi/ec_sys.c | 3 | ||||
| -rw-r--r-- | drivers/acpi/internal.h | 7 | ||||
| -rw-r--r-- | drivers/acpi/ioapic.c | 5 | ||||
| -rw-r--r-- | drivers/acpi/irq.c | 5 | ||||
| -rw-r--r-- | drivers/acpi/pci_mcfg.c | 13 | ||||
| -rw-r--r-- | drivers/acpi/pci_slot.c | 10 | ||||
| -rw-r--r-- | drivers/acpi/power.c | 135 | ||||
| -rw-r--r-- | drivers/acpi/property.c | 5 | ||||
| -rw-r--r-- | drivers/acpi/sleep.c | 22 | ||||
| -rw-r--r-- | drivers/acpi/spcr.c | 6 | ||||
| -rw-r--r-- | drivers/acpi/x86/apple.c | 5 | ||||
| -rw-r--r-- | drivers/acpi/x86/utils.c | 5 |
27 files changed, 233 insertions, 131 deletions
diff --git a/drivers/acpi/acpi_amba.c b/drivers/acpi/acpi_amba.c index 7f77c071709a..8159f0a669b8 100644 --- a/drivers/acpi/acpi_amba.c +++ b/drivers/acpi/acpi_amba.c @@ -1,13 +1,10 @@ +// SPDX-License-Identifier: GPL-2.0-only /* * ACPI support for platform bus type. * * Copyright (C) 2015, Linaro Ltd * Author: Graeme Gregory <graeme.gregory@linaro.org> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. */ #include <linux/acpi.h> diff --git a/drivers/acpi/acpi_apd.c b/drivers/acpi/acpi_apd.c index c16f9460c4a2..ff47317d8ef1 100644 --- a/drivers/acpi/acpi_apd.c +++ b/drivers/acpi/acpi_apd.c @@ -1,13 +1,10 @@ +// SPDX-License-Identifier: GPL-2.0-only /* * AMD ACPI support for ACPI2platform device. * * Copyright (c) 2014,2015 AMD Corporation. * Authors: Ken Xue <Ken.Xue@amd.com> * Wu, Jeff <Jeff.Wu@amd.com> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. */ #include <linux/clk-provider.h> diff --git a/drivers/acpi/acpi_cmos_rtc.c b/drivers/acpi/acpi_cmos_rtc.c index 0980a133916f..33ac6cb428fe 100644 --- a/drivers/acpi/acpi_cmos_rtc.c +++ b/drivers/acpi/acpi_cmos_rtc.c @@ -1,12 +1,9 @@ +// SPDX-License-Identifier: GPL-2.0-only /* * ACPI support for CMOS RTC Address Space access * * Copyright (C) 2013, Intel Corporation * Authors: Lan Tianyu <tianyu.lan@intel.com> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. */ #include <linux/acpi.h> diff --git a/drivers/acpi/acpi_configfs.c b/drivers/acpi/acpi_configfs.c index f92033661239..9c6ff0f5a25e 100644 --- a/drivers/acpi/acpi_configfs.c +++ b/drivers/acpi/acpi_configfs.c @@ -1,11 +1,8 @@ +// SPDX-License-Identifier: GPL-2.0-only /* * ACPI configfs support * * Copyright (c) 2016 Intel Corporation - * - * This program is free software; you can redistribute it and/or modify it - * under the terms of the GNU General Public License version 2 as published by - * the Free Software Foundation. */ #define pr_fmt(fmt) "ACPI configfs: " fmt diff --git a/drivers/acpi/acpi_dbg.c b/drivers/acpi/acpi_dbg.c index d18246a2a65e..7a265c2171c0 100644 --- a/drivers/acpi/acpi_dbg.c +++ b/drivers/acpi/acpi_dbg.c @@ -1,12 +1,9 @@ +// SPDX-License-Identifier: GPL-2.0-only /* * ACPI AML interfacing support * * Copyright (C) 2015, Intel Corporation * Authors: Lv Zheng <lv.zheng@intel.com> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. */ /* #define DEBUG */ diff --git a/drivers/acpi/acpi_lpit.c b/drivers/acpi/acpi_lpit.c index 6116b0fb86d4..433376e819bb 100644 --- a/drivers/acpi/acpi_lpit.c +++ b/drivers/acpi/acpi_lpit.c @@ -129,7 +129,7 @@ static void lpit_update_residency(struct lpit_residency_info *info, static void lpit_process(u64 begin, u64 end) { - while (begin + sizeof(struct acpi_lpit_native) < end) { + while (begin + sizeof(struct acpi_lpit_native) <= end) { struct acpi_lpit_native *lpit_native = (struct acpi_lpit_native *)begin; if (!lpit_native->header.type && !lpit_native->header.flags) { @@ -148,7 +148,6 @@ static void lpit_process(u64 begin, u64 end) void acpi_init_lpit(void) { acpi_status status; - u64 lpit_begin; struct acpi_table_lpit *lpit; status = acpi_get_table(ACPI_SIG_LPIT, 0, (struct acpi_table_header **)&lpit); @@ -156,6 +155,6 @@ void acpi_init_lpit(void) if (ACPI_FAILURE(status)) return; - lpit_begin = (u64)lpit + sizeof(*lpit); - lpit_process(lpit_begin, lpit_begin + lpit->header.length); + lpit_process((u64)lpit + sizeof(*lpit), + (u64)lpit + lpit->header.length); } diff --git a/drivers/acpi/acpi_lpss.c b/drivers/acpi/acpi_lpss.c index a7396e18f168..398451839178 100644 --- a/drivers/acpi/acpi_lpss.c +++ b/drivers/acpi/acpi_lpss.c @@ -1,13 +1,10 @@ +// SPDX-License-Identifier: GPL-2.0-only /* * ACPI support for Intel Lynxpoint LPSS. * * Copyright (C) 2013, Intel Corporation * Authors: Mika Westerberg <mika.westerberg@linux.intel.com> * Rafael J. Wysocki <rafael.j.wysocki@intel.com> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. */ #include <linux/acpi.h> diff --git a/drivers/acpi/acpi_platform.c b/drivers/acpi/acpi_platform.c index 1f32caa87686..00ec4f2bf015 100644 --- a/drivers/acpi/acpi_platform.c +++ b/drivers/acpi/acpi_platform.c @@ -1,3 +1,4 @@ +// SPDX-License-Identifier: GPL-2.0-only /* * ACPI support for platform bus type. * @@ -5,10 +6,6 @@ * Authors: Mika Westerberg <mika.westerberg@linux.intel.com> * Mathias Nyman <mathias.nyman@linux.intel.com> * Rafael J. Wysocki <rafael.j.wysocki@intel.com> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. */ #include <linux/acpi.h> diff --git a/drivers/acpi/acpi_pnp.c b/drivers/acpi/acpi_pnp.c index 67d97c0090a2..f3039b93ff61 100644 --- a/drivers/acpi/acpi_pnp.c +++ b/drivers/acpi/acpi_pnp.c @@ -1,13 +1,10 @@ +// SPDX-License-Identifier: GPL-2.0-only /* * ACPI support for PNP bus type * * Copyright (C) 2014, Intel Corporation * Authors: Zhang Rui <rui.zhang@intel.com> * Rafael J. Wysocki <rafael.j.wysocki@intel.com> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. */ #include <linux/acpi.h> diff --git a/drivers/acpi/acpi_processor.c b/drivers/acpi/acpi_processor.c index fc447410ae4d..24f065114d42 100644 --- a/drivers/acpi/acpi_processor.c +++ b/drivers/acpi/acpi_processor.c @@ -1,3 +1,4 @@ +// SPDX-License-Identifier: GPL-2.0-only /* * acpi_processor.c - ACPI processor enumeration support * @@ -7,10 +8,6 @@ * Copyright (C) 2004 Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com> * Copyright (C) 2013, Intel Corporation * Rafael J. Wysocki <rafael.j.wysocki@intel.com> - * - * This program is free software; you can redistribute it and/or modify it - * under the terms of the GNU General Public License version 2 as published - * by the Free Software Foundation. */ #include <linux/acpi.h> diff --git a/drivers/acpi/acpi_watchdog.c b/drivers/acpi/acpi_watchdog.c index 95600309ce42..b5516b04ffc0 100644 --- a/drivers/acpi/acpi_watchdog.c +++ b/drivers/acpi/acpi_watchdog.c @@ -1,12 +1,9 @@ +// SPDX-License-Identifier: GPL-2.0-only /* * ACPI watchdog table parsing support. * * Copyright (C) 2016, Intel Corporation * Author: Mika Westerberg <mika.westerberg@linux.intel.com> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. */ #define pr_fmt(fmt) "ACPI: watchdog: " fmt diff --git a/drivers/acpi/arm64/gtdt.c b/drivers/acpi/arm64/gtdt.c index 92f9edf9d11e..01962c63a711 100644 --- a/drivers/acpi/arm64/gtdt.c +++ b/drivers/acpi/arm64/gtdt.c @@ -1,3 +1,4 @@ +// SPDX-License-Identifier: GPL-2.0-only /* * ARM Specific GTDT table Support * @@ -5,10 +6,6 @@ * Author: Daniel Lezcano <daniel.lezcano@linaro.org> * Fu Wei <fu.wei@linaro.org> * Hanjun Guo <hanjun.guo@linaro.org> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. */ #include <linux/acpi.h> diff --git a/drivers/acpi/bgrt.c b/drivers/acpi/bgrt.c index 75af78361ce5..251f961c28cc 100644 --- a/drivers/acpi/bgrt.c +++ b/drivers/acpi/bgrt.c @@ -1,12 +1,9 @@ +// SPDX-License-Identifier: GPL-2.0-only /* * BGRT boot graphic support * Authors: Matthew Garrett, Josh Triplett <josh@joshtriplett.org> * Copyright 2012 Red Hat, Inc <mjg@redhat.com> * Copyright 2012 Intel Corporation - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. */ #include <linux/kernel.h> diff --git a/drivers/acpi/device_pm.c b/drivers/acpi/device_pm.c index 6a9d41c44b70..28cffaaf9d82 100644 --- a/drivers/acpi/device_pm.c +++ b/drivers/acpi/device_pm.c @@ -45,6 +45,19 @@ const char *acpi_power_state_string(int state) } } +static int acpi_dev_pm_explicit_get(struct acpi_device *device, int *state) +{ + unsigned long long psc; + acpi_status status; + + status = acpi_evaluate_integer(device->handle, "_PSC", NULL, &psc); + if (ACPI_FAILURE(status)) + return -ENODEV; + + *state = psc; + return 0; +} + /** * acpi_device_get_power - Get power state of an ACPI device. * @device: Device to get the power state of. @@ -53,10 +66,16 @@ const char *acpi_power_state_string(int state) * This function does not update the device's power.state field, but it may * update its parent's power.state field (when the parent's power state is * unknown and the device's power state turns out to be D0). + * + * Also, it does not update power resource reference counters to ensure that + * the power state returned by it will be persistent and it may return a power + * state shallower than previously set by acpi_device_set_power() for @device + * (if that power state depends on any power resources). */ int acpi_device_get_power(struct acpi_device *device, int *state) { int result = ACPI_STATE_UNKNOWN; + int error; if (!device || !state) return -EINVAL; @@ -73,18 +92,16 @@ int acpi_device_get_power(struct acpi_device *device, int *state) * if available. */ if (device->power.flags.power_resources) { - int error = acpi_power_get_inferred_state(device, &result); + error = acpi_power_get_inferred_state(device, &result); if (error) return error; } if (device->power.flags.explicit_get) { - acpi_handle handle = device->handle; - unsigned long long psc; - acpi_status status; + int psc; - status = acpi_evaluate_integer(handle, "_PSC", NULL, &psc); - if (ACPI_FAILURE(status)) - return -ENODEV; + error = acpi_dev_pm_explicit_get(device, &psc); + if (error) + return error; /* * The power resources settings may indicate a power state @@ -118,7 +135,6 @@ int acpi_device_get_power(struct acpi_device *device, int *state) return 0; } -EXPORT_SYMBOL(acpi_device_get_power); static int acpi_dev_pm_explicit_set(struct acpi_device *adev, int state) { @@ -152,7 +168,8 @@ int acpi_device_set_power(struct acpi_device *device, int state) /* Make sure this is a valid target state */ - if (state == device->power.state) { + /* There is a special case for D0 addressed below. */ + if (state > ACPI_STATE_D0 && state == device->power.state) { ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] already in %s\n", device->pnp.bus_id, acpi_power_state_string(state))); @@ -202,9 +219,15 @@ int acpi_device_set_power(struct acpi_device *device, int state) return -ENODEV; } - result = acpi_dev_pm_explicit_set(device, state); - if (result) - goto end; + /* + * If the device goes from D3hot to D3cold, _PS3 has been + * evaluated for it already, so skip it in that case. + */ + if (device->power.state < ACPI_STATE_D3_HOT) { + result = acpi_dev_pm_explicit_set(device, state); + if (result) + goto end; + } if (device->power.flags.power_resources) result = acpi_power_transition(device, target_state); @@ -214,6 +237,30 @@ int acpi_device_set_power(struct acpi_device *device, int state) if (result) goto end; } + + if (device->power.state == ACPI_STATE_D0) { + int psc; + + /* Nothing to do here if _PSC is not present. */ + if (!device->power.flags.explicit_get) + return 0; + + /* + * The power state of the device was set to D0 last + * time, but that might have happened before a + * system-wide transition involving the platform + * firmware, so it may be necessary to evaluate _PS0 + * for the device here. However, use extra care here + * and evaluate _PSC to check the device's current power + * state, and only invoke _PS0 if the evaluation of _PSC + * is successful and it returns a power state different + * from D0. + */ + result = acpi_dev_pm_explicit_get(device, &psc); + if (result || psc == ACPI_STATE_D0) + return 0; + } + result = acpi_dev_pm_explicit_set(device, ACPI_STATE_D0); } diff --git a/drivers/acpi/dptf/int340x_thermal.c b/drivers/acpi/dptf/int340x_thermal.c index 0aa7c2e62e95..5c7a90186e3c 100644 --- a/drivers/acpi/dptf/int340x_thermal.c +++ b/drivers/acpi/dptf/int340x_thermal.c @@ -1,12 +1,9 @@ +// SPDX-License-Identifier: GPL-2.0-only /* * ACPI support for int340x thermal drivers * * Copyright (C) 2014, Intel Corporation * Authors: Zhang Rui <rui.zhang@intel.com> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. */ #include <linux/acpi.h> diff --git a/drivers/acpi/ec_sys.c b/drivers/acpi/ec_sys.c index 23faa66ea772..fd39c14493ab 100644 --- a/drivers/acpi/ec_sys.c +++ b/drivers/acpi/ec_sys.c @@ -1,11 +1,10 @@ +// SPDX-License-Identifier: GPL-2.0-only /* * ec_sys.c * * Copyright (C) 2010 SUSE Products GmbH/Novell * Author: * Thomas Renninger <trenn@suse.de> - * - * This work is licensed under the terms of the GNU GPL, version 2. */ #include <linux/kernel.h> diff --git a/drivers/acpi/internal.h b/drivers/acpi/internal.h index f6157d4d637a..f4c2fe6be4f2 100644 --- a/drivers/acpi/internal.h +++ b/drivers/acpi/internal.h @@ -139,8 +139,15 @@ int acpi_power_get_inferred_state(struct acpi_device *device, int *state); int acpi_power_on_resources(struct acpi_device *device, int state); int acpi_power_transition(struct acpi_device *device, int state); +/* -------------------------------------------------------------------------- + Device Power Management + -------------------------------------------------------------------------- */ +int acpi_device_get_power(struct acpi_device *device, int *state); int acpi_wakeup_device_init(void); +/* -------------------------------------------------------------------------- + Processor + -------------------------------------------------------------------------- */ #ifdef CONFIG_ARCH_MIGHT_HAVE_ACPI_PDC void acpi_early_processor_set_pdc(void); #else diff --git a/drivers/acpi/ioapic.c b/drivers/acpi/ioapic.c index 3595aa9c7c18..a690c7b18623 100644 --- a/drivers/acpi/ioapic.c +++ b/drivers/acpi/ioapic.c @@ -1,3 +1,4 @@ +// SPDX-License-Identifier: GPL-2.0-only /* * IOAPIC/IOxAPIC/IOSAPIC driver * @@ -6,10 +7,6 @@ * * Copyright (C) 2014 Intel Corporation * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - * * Based on original drivers/pci/ioapic.c * Yinghai Lu <yinghai@kernel.org> * Jiang Liu <jiang.liu@intel.com> diff --git a/drivers/acpi/irq.c b/drivers/acpi/irq.c index c3b2222e2129..89690a471360 100644 --- a/drivers/acpi/irq.c +++ b/drivers/acpi/irq.c @@ -1,12 +1,9 @@ +// SPDX-License-Identifier: GPL-2.0-only /* * ACPI GSI IRQ layer * * Copyright (C) 2015 ARM Ltd. * Author: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. */ #include <linux/acpi.h> #include <linux/irq.h> diff --git a/drivers/acpi/pci_mcfg.c b/drivers/acpi/pci_mcfg.c index b42be067fb83..6b347d9920cc 100644 --- a/drivers/acpi/pci_mcfg.c +++ b/drivers/acpi/pci_mcfg.c @@ -1,20 +1,9 @@ +// SPDX-License-Identifier: GPL-2.0-only /* * Copyright (C) 2016 Broadcom * Author: Jayachandran C <jchandra@broadcom.com> * Copyright (C) 2016 Semihalf * Author: Tomasz Nowicki <tn@semihalf.com> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License, version 2, as - * published by the Free Software Foundation (the "GPL"). - * - * This program is distributed in the hope that it will be useful, but - * WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * General Public License version 2 (GPLv2) for more details. - * - * You should have received a copy of the GNU General Public License - * version 2 (GPLv2) along with this source code. */ #define pr_fmt(fmt) "ACPI: " fmt diff --git a/drivers/acpi/pci_slot.c b/drivers/acpi/pci_slot.c index e90b61f7d2db..ca2461d1bf14 100644 --- a/drivers/acpi/pci_slot.c +++ b/drivers/acpi/pci_slot.c @@ -1,3 +1,4 @@ +// SPDX-License-Identifier: GPL-2.0-only /* * pci_slot.c - ACPI PCI Slot Driver * @@ -11,15 +12,6 @@ * * Copyright (C) 2013 Huawei Tech. Co., Ltd. * Jiang Liu <jiang.liu@huawei.com> - * - * This program is free software; you can redistribute it and/or modify it - * under the terms and conditions of the GNU General Public License, - * version 2, as published by the Free Software Foundation. - * - * This program is distributed in the hope that it will be useful, but - * WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * General Public License for more details. */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt diff --git a/drivers/acpi/power.c b/drivers/acpi/power.c index a916417b9e70..fe1e7bc91a5e 100644 --- a/drivers/acpi/power.c +++ b/drivers/acpi/power.c @@ -42,6 +42,11 @@ ACPI_MODULE_NAME("power"); #define ACPI_POWER_RESOURCE_STATE_ON 0x01 #define ACPI_POWER_RESOURCE_STATE_UNKNOWN 0xFF +struct acpi_power_dependent_device { + struct device *dev; + struct list_head node; +}; + struct acpi_power_resource { struct acpi_device device; struct list_head list_node; @@ -51,6 +56,7 @@ struct acpi_power_resource { unsigned int ref_count; bool wakeup_enabled; struct mutex resource_lock; + struct list_head dependents; }; struct acpi_power_resource_entry { @@ -232,8 +238,121 @@ static int acpi_power_get_list_state(struct list_head *list, int *state) return 0; } +static int +acpi_power_resource_add_dependent(struct acpi_power_resource *resource, + struct device *dev) +{ + struct acpi_power_dependent_device *dep; + int ret = 0; + + mutex_lock(&resource->resource_lock); + list_for_each_entry(dep, &resource->dependents, node) { + /* Only add it once */ + if (dep->dev == dev) + goto unlock; + } + + dep = kzalloc(sizeof(*dep), GFP_KERNEL); + if (!dep) { + ret = -ENOMEM; + goto unlock; + } + + dep->dev = dev; + list_add_tail(&dep->node, &resource->dependents); + dev_dbg(dev, "added power dependency to [%s]\n", resource->name); + +unlock: + mutex_unlock(&resource->resource_lock); + return ret; +} + +static void +acpi_power_resource_remove_dependent(struct acpi_power_resource *resource, + struct device *dev) +{ + struct acpi_power_dependent_device *dep; + + mutex_lock(&resource->resource_lock); + list_for_each_entry(dep, &resource->dependents, node) { + if (dep->dev == dev) { + list_del(&dep->node); + kfree(dep); + dev_dbg(dev, "removed power dependency to [%s]\n", + resource->name); + break; + } + } + mutex_unlock(&resource->resource_lock); +} + +/** + * acpi_device_power_add_dependent - Add dependent device of this ACPI device + * @adev: ACPI device pointer + * @dev: Dependent device + * + * If @adev has non-empty _PR0 the @dev is added as dependent device to all + * power resources returned by it. This means that whenever these power + * resources are turned _ON the dependent devices get runtime resumed. This + * is needed for devices such as PCI to allow its driver to re-initialize + * it after it went to D0uninitialized. + * + * If @adev does not have _PR0 this does nothing. + * + * Returns %0 in case of success and negative errno otherwise. + */ +int acpi_device_power_add_dependent(struct acpi_device *adev, + struct device *dev) +{ + struct acpi_power_resource_entry *entry; + struct list_head *resources; + int ret; + + if (!adev->flags.power_manageable) + return 0; + + resources = &adev->power.states[ACPI_STATE_D0].resources; + list_for_each_entry(entry, resources, node) { + ret = acpi_power_resource_add_dependent(entry->resource, dev); + if (ret) + goto err; + } + + return 0; + +err: + list_for_each_entry(entry, resources, node) + acpi_power_resource_remove_dependent(entry->resource, dev); + + return ret; +} + +/** + * acpi_device_power_remove_dependent - Remove dependent device + * @adev: ACPI device pointer + * @dev: Dependent device + * + * Does the opposite of acpi_device_power_add_dependent() and removes the + * dependent device if it is found. Can be called to @adev that does not + * have _PR0 as well. + */ +void acpi_device_power_remove_dependent(struct acpi_device *adev, + struct device *dev) +{ + struct acpi_power_resource_entry *entry; + struct list_head *resources; + + if (!adev->flags.power_manageable) + return; + + resources = &adev->power.states[ACPI_STATE_D0].resources; + list_for_each_entry_reverse(entry, resources, node) + acpi_power_resource_remove_dependent(entry->resource, dev); +} + static int __acpi_power_on(struct acpi_power_resource *resource) { + struct acpi_power_dependent_device *dep; acpi_status status = AE_OK; status = acpi_evaluate_object(resource->device.handle, "_ON", NULL, NULL); @@ -243,6 +362,21 @@ static int __acpi_power_on(struct acpi_power_resource *resource) ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Power resource [%s] turned on\n", resource->name)); + /* + * If there are other dependents on this power resource we need to + * resume them now so that their drivers can re-initialize the + * hardware properly after it went back to D0. + */ + if (list_empty(&resource->dependents) || + list_is_singular(&resource->dependents)) + return 0; + + list_for_each_entry(dep, &resource->dependents, node) { + dev_dbg(dep->dev, "runtime resuming because [%s] turned on\n", + resource->name); + pm_request_resume(dep->dev); + } + return 0; } @@ -810,6 +944,7 @@ int acpi_add_power_resource(acpi_handle handle) ACPI_STA_DEFAULT); mutex_init(&resource->resource_lock); INIT_LIST_HEAD(&resource->list_node); + INIT_LIST_HEAD(&resource->dependents); resource->name = device->pnp.bus_id; strcpy(acpi_device_name(device), ACPI_POWER_DEVICE_NAME); strcpy(acpi_device_class(device), ACPI_POWER_CLASS); diff --git a/drivers/acpi/property.c b/drivers/acpi/property.c index 9d460a859be0..da3ced297f19 100644 --- a/drivers/acpi/property.c +++ b/drivers/acpi/property.c @@ -1,3 +1,4 @@ +// SPDX-License-Identifier: GPL-2.0-only /* * ACPI device specific properties support. * @@ -7,10 +8,6 @@ * Authors: Mika Westerberg <mika.westerberg@linux.intel.com> * Darren Hart <dvhart@linux.intel.com> * Rafael J. Wysocki <rafael.j.wysocki@intel.com> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. */ #include <linux/acpi.h> diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c index 8ff08e531443..f0fe7c15d657 100644 --- a/drivers/acpi/sleep.c +++ b/drivers/acpi/sleep.c @@ -77,7 +77,7 @@ static int acpi_sleep_prepare(u32 acpi_state) return 0; } -static bool acpi_sleep_state_supported(u8 sleep_state) +bool acpi_sleep_state_supported(u8 sleep_state) { acpi_status status; u8 type_a, type_b; @@ -452,14 +452,6 @@ static int acpi_pm_prepare(void) return error; } -static int find_powerf_dev(struct device *dev, void *data) -{ - struct acpi_device *device = to_acpi_device(dev); - const char *hid = acpi_device_hid(device); - - return !strcmp(hid, ACPI_BUTTON_HID_POWERF); -} - /** * acpi_pm_finish - Instruct the platform to leave a sleep state. * @@ -468,7 +460,7 @@ static int find_powerf_dev(struct device *dev, void *data) */ static void acpi_pm_finish(void) { - struct device *pwr_btn_dev; + struct acpi_device *pwr_btn_adev; u32 acpi_state = acpi_target_sleep_state; acpi_ec_unblock_transactions(); @@ -499,11 +491,11 @@ static void acpi_pm_finish(void) return; pwr_btn_event_pending = false; - pwr_btn_dev = bus_find_device(&acpi_bus_type, NULL, NULL, - find_powerf_dev); - if (pwr_btn_dev) { - pm_wakeup_event(pwr_btn_dev, 0); - put_device(pwr_btn_dev); + pwr_btn_adev = acpi_dev_get_first_match_dev(ACPI_BUTTON_HID_POWERF, + NULL, -1); + if (pwr_btn_adev) { + pm_wakeup_event(&pwr_btn_adev->dev, 0); + acpi_dev_put(pwr_btn_adev); } } diff --git a/drivers/acpi/spcr.c b/drivers/acpi/spcr.c index b34d05e365b7..d73b4535e79d 100644 --- a/drivers/acpi/spcr.c +++ b/drivers/acpi/spcr.c @@ -1,12 +1,8 @@ +// SPDX-License-Identifier: GPL-2.0-only /* * Copyright (c) 2012, Intel Corporation * Copyright (c) 2015, Red Hat, Inc. * Copyright (c) 2015, 2016 Linaro Ltd. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - * */ #define pr_fmt(fmt) "ACPI: SPCR: " fmt diff --git a/drivers/acpi/x86/apple.c b/drivers/acpi/x86/apple.c index b7c98ff82d78..c285c91a5e9c 100644 --- a/drivers/acpi/x86/apple.c +++ b/drivers/acpi/x86/apple.c @@ -1,10 +1,7 @@ +// SPDX-License-Identifier: GPL-2.0-only /* * apple.c - Apple ACPI quirks * Copyright (C) 2017 Lukas Wunner <lukas@wunner.de> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License (version 2) as - * published by the Free Software Foundation. */ #include <linux/acpi.h> diff --git a/drivers/acpi/x86/utils.c b/drivers/acpi/x86/utils.c index c6df14802741..ba277cd5c7fa 100644 --- a/drivers/acpi/x86/utils.c +++ b/drivers/acpi/x86/utils.c @@ -1,3 +1,4 @@ +// SPDX-License-Identifier: GPL-2.0-only /* * X86 ACPI Utility Functions * @@ -5,10 +6,6 @@ * * Based on various non upstream patches to support the CHT Whiskey Cove PMIC: * Copyright (C) 2013-2015 Intel Corporation. All rights reserved. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. */ #include <linux/acpi.h> |