utils.c (a976c2951d8f376112361830aa7762beff83a205) utils.c (3b6a70be5ac81673af1ca8b4dae84743cb9fcc87)
1/*
2 * X86 ACPI Utility Functions
3 *
4 * Copyright (C) 2017 Hans de Goede <hdegoede@redhat.com>
5 *
6 * Based on various non upstream patches to support the CHT Whiskey Cove PMIC:
7 * Copyright (C) 2013-2015 Intel Corporation. All rights reserved.
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13
14#include <linux/acpi.h>
1/*
2 * X86 ACPI Utility Functions
3 *
4 * Copyright (C) 2017 Hans de Goede <hdegoede@redhat.com>
5 *
6 * Based on various non upstream patches to support the CHT Whiskey Cove PMIC:
7 * Copyright (C) 2013-2015 Intel Corporation. All rights reserved.
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13
14#include <linux/acpi.h>
15#include <linux/dmi.h>
15#include <asm/cpu_device_id.h>
16#include <asm/intel-family.h>
17#include "../internal.h"
18
19/*
20 * Some ACPI devices are hidden (status == 0x0) in recent BIOS-es because
21 * some recent Windows drivers bind to one device but poke at multiple
22 * devices at the same time, so the others get hidden.
16#include <asm/cpu_device_id.h>
17#include <asm/intel-family.h>
18#include "../internal.h"
19
20/*
21 * Some ACPI devices are hidden (status == 0x0) in recent BIOS-es because
22 * some recent Windows drivers bind to one device but poke at multiple
23 * devices at the same time, so the others get hidden.
24 *
25 * Some BIOS-es (temporarily) hide specific APCI devices to work around Windows
26 * driver bugs. We use DMI matching to match known cases of this.
27 *
23 * We work around this by always reporting ACPI_STA_DEFAULT for these
24 * devices. Note this MUST only be done for devices where this is safe.
25 *
26 * This forcing of devices to be present is limited to specific CPU (SoC)
27 * models both to avoid potentially causing trouble on other models and
28 * because some HIDs are re-used on different SoCs for completely
29 * different devices.
30 */
31struct always_present_id {
32 struct acpi_device_id hid[2];
33 struct x86_cpu_id cpu_ids[2];
28 * We work around this by always reporting ACPI_STA_DEFAULT for these
29 * devices. Note this MUST only be done for devices where this is safe.
30 *
31 * This forcing of devices to be present is limited to specific CPU (SoC)
32 * models both to avoid potentially causing trouble on other models and
33 * because some HIDs are re-used on different SoCs for completely
34 * different devices.
35 */
36struct always_present_id {
37 struct acpi_device_id hid[2];
38 struct x86_cpu_id cpu_ids[2];
39 struct dmi_system_id dmi_ids[2]; /* Optional */
34 const char *uid;
35};
36
37#define ICPU(model) { X86_VENDOR_INTEL, 6, model, X86_FEATURE_ANY, }
38
40 const char *uid;
41};
42
43#define ICPU(model) { X86_VENDOR_INTEL, 6, model, X86_FEATURE_ANY, }
44
39#define ENTRY(hid, uid, cpu_models) { \
45#define ENTRY(hid, uid, cpu_models, dmi...) { \
40 { { hid, }, {} }, \
41 { cpu_models, {} }, \
46 { { hid, }, {} }, \
47 { cpu_models, {} }, \
48 { { .matches = dmi }, {} }, \
42 uid, \
43}
44
45static const struct always_present_id always_present_ids[] = {
46 /*
47 * Bay / Cherry Trail PWM directly poked by GPU driver in win10,
48 * but Linux uses a separate PWM driver, harmless if not used.
49 */
49 uid, \
50}
51
52static const struct always_present_id always_present_ids[] = {
53 /*
54 * Bay / Cherry Trail PWM directly poked by GPU driver in win10,
55 * but Linux uses a separate PWM driver, harmless if not used.
56 */
50 ENTRY("80860F09", "1", ICPU(INTEL_FAM6_ATOM_SILVERMONT1)),
51 ENTRY("80862288", "1", ICPU(INTEL_FAM6_ATOM_AIRMONT)),
57 ENTRY("80860F09", "1", ICPU(INTEL_FAM6_ATOM_SILVERMONT1), {}),
58 ENTRY("80862288", "1", ICPU(INTEL_FAM6_ATOM_AIRMONT), {}),
52 /*
53 * The INT0002 device is necessary to clear wakeup interrupt sources
54 * on Cherry Trail devices, without it we get nobody cared IRQ msgs.
55 */
59 /*
60 * The INT0002 device is necessary to clear wakeup interrupt sources
61 * on Cherry Trail devices, without it we get nobody cared IRQ msgs.
62 */
56 ENTRY("INT0002", "1", ICPU(INTEL_FAM6_ATOM_AIRMONT)),
63 ENTRY("INT0002", "1", ICPU(INTEL_FAM6_ATOM_AIRMONT), {}),
57};
58
59bool acpi_device_always_present(struct acpi_device *adev)
60{
61 u32 *status = (u32 *)&adev->status;
62 u32 old_status = *status;
63 bool ret = false;
64 unsigned int i;

--- 6 unchanged lines hidden (view full) ---

71
72 if (!adev->pnp.unique_id ||
73 strcmp(adev->pnp.unique_id, always_present_ids[i].uid))
74 continue;
75
76 if (!x86_match_cpu(always_present_ids[i].cpu_ids))
77 continue;
78
64};
65
66bool acpi_device_always_present(struct acpi_device *adev)
67{
68 u32 *status = (u32 *)&adev->status;
69 u32 old_status = *status;
70 bool ret = false;
71 unsigned int i;

--- 6 unchanged lines hidden (view full) ---

78
79 if (!adev->pnp.unique_id ||
80 strcmp(adev->pnp.unique_id, always_present_ids[i].uid))
81 continue;
82
83 if (!x86_match_cpu(always_present_ids[i].cpu_ids))
84 continue;
85
86 if (always_present_ids[i].dmi_ids[0].matches[0].slot &&
87 !dmi_check_system(always_present_ids[i].dmi_ids))
88 continue;
89
79 if (old_status != ACPI_STA_DEFAULT) /* Log only once */
80 dev_info(&adev->dev,
81 "Device [%s] is in always present list\n",
82 adev->pnp.bus_id);
83
84 ret = true;
85 break;
86 }
87 *status = old_status;
88
89 return ret;
90}
90 if (old_status != ACPI_STA_DEFAULT) /* Log only once */
91 dev_info(&adev->dev,
92 "Device [%s] is in always present list\n",
93 adev->pnp.bus_id);
94
95 ret = true;
96 break;
97 }
98 *status = old_status;
99
100 return ret;
101}