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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Intel ACPI functions
4 *
5 * _DSM related code stolen from nouveau_acpi.c.
6 */
7
8#include <linux/pci.h>
9#include <linux/acpi.h>
10
11#include "i915_drv.h"
12#include "intel_acpi.h"
13#include "intel_display_types.h"
14
15#define INTEL_DSM_REVISION_ID 1 /* For Calpella anyway... */
16#define INTEL_DSM_FN_PLATFORM_MUX_INFO 1 /* No args */
17
18static const guid_t intel_dsm_guid =
19 GUID_INIT(0x7ed873d3, 0xc2d0, 0x4e4f,
20 0xa8, 0x54, 0x0f, 0x13, 0x17, 0xb0, 0x1c, 0x2c);
21
22static char *intel_dsm_port_name(u8 id)
23{
24 switch (id) {
25 case 0:
26 return "Reserved";
27 case 1:
28 return "Analog VGA";
29 case 2:
30 return "LVDS";
31 case 3:
32 return "Reserved";
33 case 4:
34 return "HDMI/DVI_B";
35 case 5:
36 return "HDMI/DVI_C";
37 case 6:
38 return "HDMI/DVI_D";
39 case 7:
40 return "DisplayPort_A";
41 case 8:
42 return "DisplayPort_B";
43 case 9:
44 return "DisplayPort_C";
45 case 0xa:
46 return "DisplayPort_D";
47 case 0xb:
48 case 0xc:
49 case 0xd:
50 return "Reserved";
51 case 0xe:
52 return "WiDi";
53 default:
54 return "bad type";
55 }
56}
57
58static char *intel_dsm_mux_type(u8 type)
59{
60 switch (type) {
61 case 0:
62 return "unknown";
63 case 1:
64 return "No MUX, iGPU only";
65 case 2:
66 return "No MUX, dGPU only";
67 case 3:
68 return "MUXed between iGPU and dGPU";
69 default:
70 return "bad type";
71 }
72}
73
74static void intel_dsm_platform_mux_info(acpi_handle dhandle)
75{
76 int i;
77 union acpi_object *pkg, *connector_count;
78
79 pkg = acpi_evaluate_dsm_typed(dhandle, &intel_dsm_guid,
80 INTEL_DSM_REVISION_ID, INTEL_DSM_FN_PLATFORM_MUX_INFO,
81 NULL, ACPI_TYPE_PACKAGE);
82 if (!pkg) {
83 DRM_DEBUG_DRIVER("failed to evaluate _DSM\n");
84 return;
85 }
86
87 connector_count = &pkg->package.elements[0];
88 DRM_DEBUG_DRIVER("MUX info connectors: %lld\n",
89 (unsigned long long)connector_count->integer.value);
90 for (i = 1; i < pkg->package.count; i++) {
91 union acpi_object *obj = &pkg->package.elements[i];
92 union acpi_object *connector_id = &obj->package.elements[0];
93 union acpi_object *info = &obj->package.elements[1];
94 DRM_DEBUG_DRIVER("Connector id: 0x%016llx\n",
95 (unsigned long long)connector_id->integer.value);
96 DRM_DEBUG_DRIVER(" port id: %s\n",
97 intel_dsm_port_name(info->buffer.pointer[0]));
98 DRM_DEBUG_DRIVER(" display mux info: %s\n",
99 intel_dsm_mux_type(info->buffer.pointer[1]));
100 DRM_DEBUG_DRIVER(" aux/dc mux info: %s\n",
101 intel_dsm_mux_type(info->buffer.pointer[2]));
102 DRM_DEBUG_DRIVER(" hpd mux info: %s\n",
103 intel_dsm_mux_type(info->buffer.pointer[3]));
104 }
105
106 ACPI_FREE(pkg);
107}
108
109static acpi_handle intel_dsm_pci_probe(struct pci_dev *pdev)
110{
111 acpi_handle dhandle;
112
113 dhandle = ACPI_HANDLE(&pdev->dev);
114 if (!dhandle)
115 return NULL;
116
117 if (!acpi_check_dsm(dhandle, &intel_dsm_guid, INTEL_DSM_REVISION_ID,
118 1 << INTEL_DSM_FN_PLATFORM_MUX_INFO)) {
119 DRM_DEBUG_KMS("no _DSM method for intel device\n");
120 return NULL;
121 }
122
123 intel_dsm_platform_mux_info(dhandle);
124
125 return dhandle;
126}
127
128static bool intel_dsm_detect(void)
129{
130 acpi_handle dhandle = NULL;
131 char acpi_method_name[255] = { 0 };
132 struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
133 struct pci_dev *pdev = NULL;
134 int vga_count = 0;
135
136 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
137 vga_count++;
138 dhandle = intel_dsm_pci_probe(pdev) ?: dhandle;
139 }
140
141 if (vga_count == 2 && dhandle) {
142 acpi_get_name(dhandle, ACPI_FULL_PATHNAME, &buffer);
143 DRM_DEBUG_DRIVER("vga_switcheroo: detected DSM switching method %s handle\n",
144 acpi_method_name);
145 return true;
146 }
147
148 return false;
149}
150
151void intel_register_dsm_handler(void)
152{
153 if (!intel_dsm_detect())
154 return;
155}
156
157void intel_unregister_dsm_handler(void)
158{
159}
160
161/*
162 * ACPI Specification, Revision 5.0, Appendix B.3.2 _DOD (Enumerate All Devices
163 * Attached to the Display Adapter).
164 */
165#define ACPI_DISPLAY_INDEX_SHIFT 0
166#define ACPI_DISPLAY_INDEX_MASK (0xf << 0)
167#define ACPI_DISPLAY_PORT_ATTACHMENT_SHIFT 4
168#define ACPI_DISPLAY_PORT_ATTACHMENT_MASK (0xf << 4)
169#define ACPI_DISPLAY_TYPE_SHIFT 8
170#define ACPI_DISPLAY_TYPE_MASK (0xf << 8)
171#define ACPI_DISPLAY_TYPE_OTHER (0 << 8)
172#define ACPI_DISPLAY_TYPE_VGA (1 << 8)
173#define ACPI_DISPLAY_TYPE_TV (2 << 8)
174#define ACPI_DISPLAY_TYPE_EXTERNAL_DIGITAL (3 << 8)
175#define ACPI_DISPLAY_TYPE_INTERNAL_DIGITAL (4 << 8)
176#define ACPI_VENDOR_SPECIFIC_SHIFT 12
177#define ACPI_VENDOR_SPECIFIC_MASK (0xf << 12)
178#define ACPI_BIOS_CAN_DETECT (1 << 16)
179#define ACPI_DEPENDS_ON_VGA (1 << 17)
180#define ACPI_PIPE_ID_SHIFT 18
181#define ACPI_PIPE_ID_MASK (7 << 18)
182#define ACPI_DEVICE_ID_SCHEME (1ULL << 31)
183
184static u32 acpi_display_type(struct intel_connector *connector)
185{
186 u32 display_type;
187
188 switch (connector->base.connector_type) {
189 case DRM_MODE_CONNECTOR_VGA:
190 case DRM_MODE_CONNECTOR_DVIA:
191 display_type = ACPI_DISPLAY_TYPE_VGA;
192 break;
193 case DRM_MODE_CONNECTOR_Composite:
194 case DRM_MODE_CONNECTOR_SVIDEO:
195 case DRM_MODE_CONNECTOR_Component:
196 case DRM_MODE_CONNECTOR_9PinDIN:
197 case DRM_MODE_CONNECTOR_TV:
198 display_type = ACPI_DISPLAY_TYPE_TV;
199 break;
200 case DRM_MODE_CONNECTOR_DVII:
201 case DRM_MODE_CONNECTOR_DVID:
202 case DRM_MODE_CONNECTOR_DisplayPort:
203 case DRM_MODE_CONNECTOR_HDMIA:
204 case DRM_MODE_CONNECTOR_HDMIB:
205 display_type = ACPI_DISPLAY_TYPE_EXTERNAL_DIGITAL;
206 break;
207 case DRM_MODE_CONNECTOR_LVDS:
208 case DRM_MODE_CONNECTOR_eDP:
209 case DRM_MODE_CONNECTOR_DSI:
210 display_type = ACPI_DISPLAY_TYPE_INTERNAL_DIGITAL;
211 break;
212 case DRM_MODE_CONNECTOR_Unknown:
213 case DRM_MODE_CONNECTOR_VIRTUAL:
214 display_type = ACPI_DISPLAY_TYPE_OTHER;
215 break;
216 default:
217 MISSING_CASE(connector->base.connector_type);
218 display_type = ACPI_DISPLAY_TYPE_OTHER;
219 break;
220 }
221
222 return display_type;
223}
224
225void intel_acpi_device_id_update(struct drm_i915_private *dev_priv)
226{
227 struct drm_device *drm_dev = &dev_priv->drm;
228 struct intel_connector *connector;
229 struct drm_connector_list_iter conn_iter;
230 u8 display_index[16] = {};
231
232 /* Populate the ACPI IDs for all connectors for a given drm_device */
233 drm_connector_list_iter_begin(drm_dev, &conn_iter);
234 for_each_intel_connector_iter(connector, &conn_iter) {
235 u32 device_id, type;
236
237 device_id = acpi_display_type(connector);
238
239 /* Use display type specific display index. */
240 type = (device_id & ACPI_DISPLAY_TYPE_MASK)
241 >> ACPI_DISPLAY_TYPE_SHIFT;
242 device_id |= display_index[type]++ << ACPI_DISPLAY_INDEX_SHIFT;
243
244 connector->acpi_device_id = device_id;
245 }
246 drm_connector_list_iter_end(&conn_iter);
247}