diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/acpi/Makefile | 1 | ||||
| -rw-r--r-- | drivers/acpi/bus.c | 5 | ||||
| -rw-r--r-- | drivers/acpi/x86/utils.c | 85 |
3 files changed, 91 insertions, 0 deletions
diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile index d94f92f88ca1..2a81d278bcf3 100644 --- a/drivers/acpi/Makefile +++ b/drivers/acpi/Makefile @@ -50,6 +50,7 @@ acpi-$(CONFIG_ACPI_REDUCED_HARDWARE_ONLY) += evged.o acpi-y += sysfs.o acpi-y += property.o acpi-$(CONFIG_X86) += acpi_cmos_rtc.o +acpi-$(CONFIG_X86) += x86/utils.o acpi-$(CONFIG_DEBUG_FS) += debugfs.o acpi-$(CONFIG_ACPI_NUMA) += numa.o acpi-$(CONFIG_ACPI_PROCFS_POWER) += cm_sbs.o diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c index 34fbe027e73a..784bda663d16 100644 --- a/drivers/acpi/bus.c +++ b/drivers/acpi/bus.c @@ -114,6 +114,11 @@ int acpi_bus_get_status(struct acpi_device *device) acpi_status status; unsigned long long sta; + if (acpi_device_always_present(device)) { + acpi_set_device_status(device, ACPI_STA_DEFAULT); + return 0; + } + status = acpi_bus_get_status_handle(device->handle, &sta); if (ACPI_FAILURE(status)) return -ENODEV; diff --git a/drivers/acpi/x86/utils.c b/drivers/acpi/x86/utils.c new file mode 100644 index 000000000000..c8e90ef4485f --- /dev/null +++ b/drivers/acpi/x86/utils.c @@ -0,0 +1,85 @@ +/* + * X86 ACPI Utility Functions + * + * Copyright (C) 2017 Hans de Goede <hdegoede@redhat.com> + * + * 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> +#include <asm/cpu_device_id.h> +#include <asm/intel-family.h> +#include "../internal.h" + +/* + * Some ACPI devices are hidden (status == 0x0) in recent BIOS-es because + * some recent Windows drivers bind to one device but poke at multiple + * devices at the same time, so the others get hidden. + * We work around this by always reporting ACPI_STA_DEFAULT for these + * devices. Note this MUST only be done for devices where this is safe. + * + * This forcing of devices to be present is limited to specific CPU (SoC) + * models both to avoid potentially causing trouble on other models and + * because some HIDs are re-used on different SoCs for completely + * different devices. + */ +struct always_present_id { + struct acpi_device_id hid[2]; + struct x86_cpu_id cpu_ids[2]; + const char *uid; +}; + +#define ICPU(model) { X86_VENDOR_INTEL, 6, model, X86_FEATURE_ANY, } + +#define ENTRY(hid, uid, cpu_models) { \ + { { hid, }, {} }, \ + { cpu_models, {} }, \ + uid, \ +} + +static const struct always_present_id always_present_ids[] = { + /* + * Bay / Cherry Trail PWM directly poked by GPU driver in win10, + * but Linux uses a separate PWM driver, harmless if not used. + */ + ENTRY("80860F09", "1", ICPU(INTEL_FAM6_ATOM_SILVERMONT1)), + ENTRY("80862288", "1", ICPU(INTEL_FAM6_ATOM_AIRMONT)), +}; + +bool acpi_device_always_present(struct acpi_device *adev) +{ + u32 *status = (u32 *)&adev->status; + u32 old_status = *status; + bool ret = false; + unsigned int i; + + /* acpi_match_device_ids checks status, so set it to default */ + *status = ACPI_STA_DEFAULT; + for (i = 0; i < ARRAY_SIZE(always_present_ids); i++) { + if (acpi_match_device_ids(adev, always_present_ids[i].hid)) + continue; + + if (!adev->pnp.unique_id || + strcmp(adev->pnp.unique_id, always_present_ids[i].uid)) + continue; + + if (!x86_match_cpu(always_present_ids[i].cpu_ids)) + continue; + + if (old_status != ACPI_STA_DEFAULT) /* Log only once */ + dev_info(&adev->dev, + "Device [%s] is in always present list\n", + adev->pnp.bus_id); + + ret = true; + break; + } + *status = old_status; + + return ret; +} |