forked from Minki/linux
753a448c27
The INT0002 device is necessary to clear wakeup interrupt sources on Cherry Trail devices, without it we get nobody cared IRQ msgs and some systems don't properly resume at all without it. Signed-off-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
91 lines
2.7 KiB
C
91 lines
2.7 KiB
C
/*
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* X86 ACPI Utility Functions
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*
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* Copyright (C) 2017 Hans de Goede <hdegoede@redhat.com>
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*
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* Based on various non upstream patches to support the CHT Whiskey Cove PMIC:
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* Copyright (C) 2013-2015 Intel Corporation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/acpi.h>
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#include <asm/cpu_device_id.h>
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#include <asm/intel-family.h>
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#include "../internal.h"
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/*
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* Some ACPI devices are hidden (status == 0x0) in recent BIOS-es because
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* some recent Windows drivers bind to one device but poke at multiple
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* devices at the same time, so the others get hidden.
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* We work around this by always reporting ACPI_STA_DEFAULT for these
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* devices. Note this MUST only be done for devices where this is safe.
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*
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* This forcing of devices to be present is limited to specific CPU (SoC)
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* models both to avoid potentially causing trouble on other models and
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* because some HIDs are re-used on different SoCs for completely
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* different devices.
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*/
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struct always_present_id {
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struct acpi_device_id hid[2];
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struct x86_cpu_id cpu_ids[2];
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const char *uid;
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};
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#define ICPU(model) { X86_VENDOR_INTEL, 6, model, X86_FEATURE_ANY, }
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#define ENTRY(hid, uid, cpu_models) { \
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{ { hid, }, {} }, \
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{ cpu_models, {} }, \
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uid, \
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}
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static const struct always_present_id always_present_ids[] = {
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/*
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* Bay / Cherry Trail PWM directly poked by GPU driver in win10,
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* but Linux uses a separate PWM driver, harmless if not used.
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*/
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ENTRY("80860F09", "1", ICPU(INTEL_FAM6_ATOM_SILVERMONT1)),
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ENTRY("80862288", "1", ICPU(INTEL_FAM6_ATOM_AIRMONT)),
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/*
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* The INT0002 device is necessary to clear wakeup interrupt sources
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* on Cherry Trail devices, without it we get nobody cared IRQ msgs.
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*/
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ENTRY("INT0002", "1", ICPU(INTEL_FAM6_ATOM_AIRMONT)),
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};
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bool acpi_device_always_present(struct acpi_device *adev)
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{
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u32 *status = (u32 *)&adev->status;
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u32 old_status = *status;
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bool ret = false;
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unsigned int i;
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/* acpi_match_device_ids checks status, so set it to default */
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*status = ACPI_STA_DEFAULT;
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for (i = 0; i < ARRAY_SIZE(always_present_ids); i++) {
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if (acpi_match_device_ids(adev, always_present_ids[i].hid))
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continue;
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if (!adev->pnp.unique_id ||
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strcmp(adev->pnp.unique_id, always_present_ids[i].uid))
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continue;
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if (!x86_match_cpu(always_present_ids[i].cpu_ids))
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continue;
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if (old_status != ACPI_STA_DEFAULT) /* Log only once */
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dev_info(&adev->dev,
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"Device [%s] is in always present list\n",
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adev->pnp.bus_id);
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ret = true;
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break;
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}
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*status = old_status;
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return ret;
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}
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