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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
16#define INTEL_DSM_FN_PLATFORM_MUX_INFO 1
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 if (!pkg->package.count) {
88 DRM_DEBUG_DRIVER("no connection in _DSM\n");
89 return;
90 }
91
92 connector_count = &pkg->package.elements[0];
93 DRM_DEBUG_DRIVER("MUX info connectors: %lld\n",
94 (unsigned long long)connector_count->integer.value);
95 for (i = 1; i < pkg->package.count; i++) {
96 union acpi_object *obj = &pkg->package.elements[i];
97 union acpi_object *connector_id;
98 union acpi_object *info;
99
100 if (obj->type != ACPI_TYPE_PACKAGE || obj->package.count < 2) {
101 DRM_DEBUG_DRIVER("Invalid object for MUX #%d\n", i);
102 continue;
103 }
104
105 connector_id = &obj->package.elements[0];
106 info = &obj->package.elements[1];
107 if (info->type != ACPI_TYPE_BUFFER || info->buffer.length < 4) {
108 DRM_DEBUG_DRIVER("Invalid info for MUX obj #%d\n", i);
109 continue;
110 }
111
112 DRM_DEBUG_DRIVER("Connector id: 0x%016llx\n",
113 (unsigned long long)connector_id->integer.value);
114 DRM_DEBUG_DRIVER(" port id: %s\n",
115 intel_dsm_port_name(info->buffer.pointer[0]));
116 DRM_DEBUG_DRIVER(" display mux info: %s\n",
117 intel_dsm_mux_type(info->buffer.pointer[1]));
118 DRM_DEBUG_DRIVER(" aux/dc mux info: %s\n",
119 intel_dsm_mux_type(info->buffer.pointer[2]));
120 DRM_DEBUG_DRIVER(" hpd mux info: %s\n",
121 intel_dsm_mux_type(info->buffer.pointer[3]));
122 }
123
124 ACPI_FREE(pkg);
125}
126
127static acpi_handle intel_dsm_pci_probe(struct pci_dev *pdev)
128{
129 acpi_handle dhandle;
130
131 dhandle = ACPI_HANDLE(&pdev->dev);
132 if (!dhandle)
133 return NULL;
134
135 if (!acpi_check_dsm(dhandle, &intel_dsm_guid, INTEL_DSM_REVISION_ID,
136 1 << INTEL_DSM_FN_PLATFORM_MUX_INFO)) {
137 DRM_DEBUG_KMS("no _DSM method for intel device\n");
138 return NULL;
139 }
140
141 intel_dsm_platform_mux_info(dhandle);
142
143 return dhandle;
144}
145
146static bool intel_dsm_detect(void)
147{
148 acpi_handle dhandle = NULL;
149 char acpi_method_name[255] = { 0 };
150 struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
151 struct pci_dev *pdev = NULL;
152 int vga_count = 0;
153
154 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
155 vga_count++;
156 dhandle = intel_dsm_pci_probe(pdev) ?: dhandle;
157 }
158
159 if (vga_count == 2 && dhandle) {
160 acpi_get_name(dhandle, ACPI_FULL_PATHNAME, &buffer);
161 DRM_DEBUG_DRIVER("vga_switcheroo: detected DSM switching method %s handle\n",
162 acpi_method_name);
163 return true;
164 }
165
166 return false;
167}
168
169void intel_register_dsm_handler(void)
170{
171 if (!intel_dsm_detect())
172 return;
173}
174
175void intel_unregister_dsm_handler(void)
176{
177}
178
179
180
181
182
183#define ACPI_DISPLAY_INDEX_SHIFT 0
184#define ACPI_DISPLAY_INDEX_MASK (0xf << 0)
185#define ACPI_DISPLAY_PORT_ATTACHMENT_SHIFT 4
186#define ACPI_DISPLAY_PORT_ATTACHMENT_MASK (0xf << 4)
187#define ACPI_DISPLAY_TYPE_SHIFT 8
188#define ACPI_DISPLAY_TYPE_MASK (0xf << 8)
189#define ACPI_DISPLAY_TYPE_OTHER (0 << 8)
190#define ACPI_DISPLAY_TYPE_VGA (1 << 8)
191#define ACPI_DISPLAY_TYPE_TV (2 << 8)
192#define ACPI_DISPLAY_TYPE_EXTERNAL_DIGITAL (3 << 8)
193#define ACPI_DISPLAY_TYPE_INTERNAL_DIGITAL (4 << 8)
194#define ACPI_VENDOR_SPECIFIC_SHIFT 12
195#define ACPI_VENDOR_SPECIFIC_MASK (0xf << 12)
196#define ACPI_BIOS_CAN_DETECT (1 << 16)
197#define ACPI_DEPENDS_ON_VGA (1 << 17)
198#define ACPI_PIPE_ID_SHIFT 18
199#define ACPI_PIPE_ID_MASK (7 << 18)
200#define ACPI_DEVICE_ID_SCHEME (1ULL << 31)
201
202static u32 acpi_display_type(struct intel_connector *connector)
203{
204 u32 display_type;
205
206 switch (connector->base.connector_type) {
207 case DRM_MODE_CONNECTOR_VGA:
208 case DRM_MODE_CONNECTOR_DVIA:
209 display_type = ACPI_DISPLAY_TYPE_VGA;
210 break;
211 case DRM_MODE_CONNECTOR_Composite:
212 case DRM_MODE_CONNECTOR_SVIDEO:
213 case DRM_MODE_CONNECTOR_Component:
214 case DRM_MODE_CONNECTOR_9PinDIN:
215 case DRM_MODE_CONNECTOR_TV:
216 display_type = ACPI_DISPLAY_TYPE_TV;
217 break;
218 case DRM_MODE_CONNECTOR_DVII:
219 case DRM_MODE_CONNECTOR_DVID:
220 case DRM_MODE_CONNECTOR_DisplayPort:
221 case DRM_MODE_CONNECTOR_HDMIA:
222 case DRM_MODE_CONNECTOR_HDMIB:
223 display_type = ACPI_DISPLAY_TYPE_EXTERNAL_DIGITAL;
224 break;
225 case DRM_MODE_CONNECTOR_LVDS:
226 case DRM_MODE_CONNECTOR_eDP:
227 case DRM_MODE_CONNECTOR_DSI:
228 display_type = ACPI_DISPLAY_TYPE_INTERNAL_DIGITAL;
229 break;
230 case DRM_MODE_CONNECTOR_Unknown:
231 case DRM_MODE_CONNECTOR_VIRTUAL:
232 display_type = ACPI_DISPLAY_TYPE_OTHER;
233 break;
234 default:
235 MISSING_CASE(connector->base.connector_type);
236 display_type = ACPI_DISPLAY_TYPE_OTHER;
237 break;
238 }
239
240 return display_type;
241}
242
243void intel_acpi_device_id_update(struct drm_i915_private *dev_priv)
244{
245 struct drm_device *drm_dev = &dev_priv->drm;
246 struct intel_connector *connector;
247 struct drm_connector_list_iter conn_iter;
248 u8 display_index[16] = {};
249
250
251 drm_connector_list_iter_begin(drm_dev, &conn_iter);
252 for_each_intel_connector_iter(connector, &conn_iter) {
253 u32 device_id, type;
254
255 device_id = acpi_display_type(connector);
256
257
258 type = (device_id & ACPI_DISPLAY_TYPE_MASK)
259 >> ACPI_DISPLAY_TYPE_SHIFT;
260 device_id |= display_index[type]++ << ACPI_DISPLAY_INDEX_SHIFT;
261
262 connector->acpi_device_id = device_id;
263 }
264 drm_connector_list_iter_end(&conn_iter);
265}
266
