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 #include <acpi/video.h>
11
12 #include "i915_drv.h"
13 #include "intel_acpi.h"
14 #include "intel_display_types.h"
15
16 #define INTEL_DSM_REVISION_ID 1 /* For Calpella anyway... */
17 #define INTEL_DSM_FN_PLATFORM_MUX_INFO 1 /* No args */
18
19 static const guid_t intel_dsm_guid =
20 GUID_INIT(0x7ed873d3, 0xc2d0, 0x4e4f,
21 0xa8, 0x54, 0x0f, 0x13, 0x17, 0xb0, 0x1c, 0x2c);
22
23 #define INTEL_DSM_FN_GET_BIOS_DATA_FUNCS_SUPPORTED 0 /* No args */
24
25 static const guid_t intel_dsm_guid2 =
26 GUID_INIT(0x3e5b41c6, 0xeb1d, 0x4260,
27 0x9d, 0x15, 0xc7, 0x1f, 0xba, 0xda, 0xe4, 0x14);
28
intel_dsm_port_name(u8 id)29 static char *intel_dsm_port_name(u8 id)
30 {
31 switch (id) {
32 case 0:
33 return "Reserved";
34 case 1:
35 return "Analog VGA";
36 case 2:
37 return "LVDS";
38 case 3:
39 return "Reserved";
40 case 4:
41 return "HDMI/DVI_B";
42 case 5:
43 return "HDMI/DVI_C";
44 case 6:
45 return "HDMI/DVI_D";
46 case 7:
47 return "DisplayPort_A";
48 case 8:
49 return "DisplayPort_B";
50 case 9:
51 return "DisplayPort_C";
52 case 0xa:
53 return "DisplayPort_D";
54 case 0xb:
55 case 0xc:
56 case 0xd:
57 return "Reserved";
58 case 0xe:
59 return "WiDi";
60 default:
61 return "bad type";
62 }
63 }
64
intel_dsm_mux_type(u8 type)65 static char *intel_dsm_mux_type(u8 type)
66 {
67 switch (type) {
68 case 0:
69 return "unknown";
70 case 1:
71 return "No MUX, iGPU only";
72 case 2:
73 return "No MUX, dGPU only";
74 case 3:
75 return "MUXed between iGPU and dGPU";
76 default:
77 return "bad type";
78 }
79 }
80
intel_dsm_platform_mux_info(acpi_handle dhandle)81 static void intel_dsm_platform_mux_info(acpi_handle dhandle)
82 {
83 int i;
84 union acpi_object *pkg, *connector_count;
85
86 pkg = acpi_evaluate_dsm_typed(dhandle, &intel_dsm_guid,
87 INTEL_DSM_REVISION_ID, INTEL_DSM_FN_PLATFORM_MUX_INFO,
88 NULL, ACPI_TYPE_PACKAGE);
89 if (!pkg) {
90 DRM_DEBUG_DRIVER("failed to evaluate _DSM\n");
91 return;
92 }
93
94 if (!pkg->package.count) {
95 DRM_DEBUG_DRIVER("no connection in _DSM\n");
96 return;
97 }
98
99 connector_count = &pkg->package.elements[0];
100 DRM_DEBUG_DRIVER("MUX info connectors: %lld\n",
101 (unsigned long long)connector_count->integer.value);
102 for (i = 1; i < pkg->package.count; i++) {
103 union acpi_object *obj = &pkg->package.elements[i];
104 union acpi_object *connector_id;
105 union acpi_object *info;
106
107 if (obj->type != ACPI_TYPE_PACKAGE || obj->package.count < 2) {
108 DRM_DEBUG_DRIVER("Invalid object for MUX #%d\n", i);
109 continue;
110 }
111
112 connector_id = &obj->package.elements[0];
113 info = &obj->package.elements[1];
114 if (info->type != ACPI_TYPE_BUFFER || info->buffer.length < 4) {
115 DRM_DEBUG_DRIVER("Invalid info for MUX obj #%d\n", i);
116 continue;
117 }
118
119 DRM_DEBUG_DRIVER("Connector id: 0x%016llx\n",
120 (unsigned long long)connector_id->integer.value);
121 DRM_DEBUG_DRIVER(" port id: %s\n",
122 intel_dsm_port_name(info->buffer.pointer[0]));
123 DRM_DEBUG_DRIVER(" display mux info: %s\n",
124 intel_dsm_mux_type(info->buffer.pointer[1]));
125 DRM_DEBUG_DRIVER(" aux/dc mux info: %s\n",
126 intel_dsm_mux_type(info->buffer.pointer[2]));
127 DRM_DEBUG_DRIVER(" hpd mux info: %s\n",
128 intel_dsm_mux_type(info->buffer.pointer[3]));
129 }
130
131 ACPI_FREE(pkg);
132 }
133
intel_dsm_pci_probe(struct pci_dev * pdev)134 static acpi_handle intel_dsm_pci_probe(struct pci_dev *pdev)
135 {
136 acpi_handle dhandle;
137
138 dhandle = ACPI_HANDLE(&pdev->dev);
139 if (!dhandle)
140 return NULL;
141
142 if (!acpi_check_dsm(dhandle, &intel_dsm_guid, INTEL_DSM_REVISION_ID,
143 1 << INTEL_DSM_FN_PLATFORM_MUX_INFO)) {
144 DRM_DEBUG_KMS("no _DSM method for intel device\n");
145 return NULL;
146 }
147
148 intel_dsm_platform_mux_info(dhandle);
149
150 return dhandle;
151 }
152
intel_dsm_detect(void)153 static bool intel_dsm_detect(void)
154 {
155 acpi_handle dhandle = NULL;
156 char acpi_method_name[255] = {};
157 struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
158 struct pci_dev *pdev = NULL;
159 int vga_count = 0;
160
161 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
162 vga_count++;
163 dhandle = intel_dsm_pci_probe(pdev) ?: dhandle;
164 }
165
166 if (vga_count == 2 && dhandle) {
167 acpi_get_name(dhandle, ACPI_FULL_PATHNAME, &buffer);
168 DRM_DEBUG_DRIVER("vga_switcheroo: detected DSM switching method %s handle\n",
169 acpi_method_name);
170 return true;
171 }
172
173 return false;
174 }
175
intel_register_dsm_handler(void)176 void intel_register_dsm_handler(void)
177 {
178 if (!intel_dsm_detect())
179 return;
180 }
181
intel_unregister_dsm_handler(void)182 void intel_unregister_dsm_handler(void)
183 {
184 }
185
intel_dsm_get_bios_data_funcs_supported(struct intel_display * display)186 void intel_dsm_get_bios_data_funcs_supported(struct intel_display *display)
187 {
188 struct pci_dev *pdev = to_pci_dev(display->drm->dev);
189 acpi_handle dhandle;
190 union acpi_object *obj;
191
192 dhandle = ACPI_HANDLE(&pdev->dev);
193 if (!dhandle)
194 return;
195
196 obj = acpi_evaluate_dsm(dhandle, &intel_dsm_guid2, INTEL_DSM_REVISION_ID,
197 INTEL_DSM_FN_GET_BIOS_DATA_FUNCS_SUPPORTED, NULL);
198 if (obj)
199 ACPI_FREE(obj);
200 }
201
202 /*
203 * ACPI Specification, Revision 5.0, Appendix B.3.2 _DOD (Enumerate All Devices
204 * Attached to the Display Adapter).
205 */
206 #define ACPI_DISPLAY_INDEX_SHIFT 0
207 #define ACPI_DISPLAY_INDEX_MASK (0xf << 0)
208 #define ACPI_DISPLAY_PORT_ATTACHMENT_SHIFT 4
209 #define ACPI_DISPLAY_PORT_ATTACHMENT_MASK (0xf << 4)
210 #define ACPI_DISPLAY_TYPE_SHIFT 8
211 #define ACPI_DISPLAY_TYPE_MASK (0xf << 8)
212 #define ACPI_DISPLAY_TYPE_OTHER (0 << 8)
213 #define ACPI_DISPLAY_TYPE_VGA (1 << 8)
214 #define ACPI_DISPLAY_TYPE_TV (2 << 8)
215 #define ACPI_DISPLAY_TYPE_EXTERNAL_DIGITAL (3 << 8)
216 #define ACPI_DISPLAY_TYPE_INTERNAL_DIGITAL (4 << 8)
217 #define ACPI_VENDOR_SPECIFIC_SHIFT 12
218 #define ACPI_VENDOR_SPECIFIC_MASK (0xf << 12)
219 #define ACPI_BIOS_CAN_DETECT (1 << 16)
220 #define ACPI_DEPENDS_ON_VGA (1 << 17)
221 #define ACPI_PIPE_ID_SHIFT 18
222 #define ACPI_PIPE_ID_MASK (7 << 18)
223 #define ACPI_DEVICE_ID_SCHEME (1ULL << 31)
224
acpi_display_type(struct intel_connector * connector)225 static u32 acpi_display_type(struct intel_connector *connector)
226 {
227 u32 display_type;
228
229 switch (connector->base.connector_type) {
230 case DRM_MODE_CONNECTOR_VGA:
231 case DRM_MODE_CONNECTOR_DVIA:
232 display_type = ACPI_DISPLAY_TYPE_VGA;
233 break;
234 case DRM_MODE_CONNECTOR_Composite:
235 case DRM_MODE_CONNECTOR_SVIDEO:
236 case DRM_MODE_CONNECTOR_Component:
237 case DRM_MODE_CONNECTOR_9PinDIN:
238 case DRM_MODE_CONNECTOR_TV:
239 display_type = ACPI_DISPLAY_TYPE_TV;
240 break;
241 case DRM_MODE_CONNECTOR_DVII:
242 case DRM_MODE_CONNECTOR_DVID:
243 case DRM_MODE_CONNECTOR_DisplayPort:
244 case DRM_MODE_CONNECTOR_HDMIA:
245 case DRM_MODE_CONNECTOR_HDMIB:
246 display_type = ACPI_DISPLAY_TYPE_EXTERNAL_DIGITAL;
247 break;
248 case DRM_MODE_CONNECTOR_LVDS:
249 case DRM_MODE_CONNECTOR_eDP:
250 case DRM_MODE_CONNECTOR_DSI:
251 display_type = ACPI_DISPLAY_TYPE_INTERNAL_DIGITAL;
252 break;
253 case DRM_MODE_CONNECTOR_Unknown:
254 case DRM_MODE_CONNECTOR_VIRTUAL:
255 display_type = ACPI_DISPLAY_TYPE_OTHER;
256 break;
257 default:
258 MISSING_CASE(connector->base.connector_type);
259 display_type = ACPI_DISPLAY_TYPE_OTHER;
260 break;
261 }
262
263 return display_type;
264 }
265
intel_acpi_device_id_update(struct intel_display * display)266 void intel_acpi_device_id_update(struct intel_display *display)
267 {
268 struct intel_connector *connector;
269 struct drm_connector_list_iter conn_iter;
270 u8 display_index[16] = {};
271
272 /* Populate the ACPI IDs for all connectors for a given drm_device */
273 drm_connector_list_iter_begin(display->drm, &conn_iter);
274 for_each_intel_connector_iter(connector, &conn_iter) {
275 u32 device_id, type;
276
277 device_id = acpi_display_type(connector);
278
279 /* Use display type specific display index. */
280 type = (device_id & ACPI_DISPLAY_TYPE_MASK)
281 >> ACPI_DISPLAY_TYPE_SHIFT;
282 device_id |= display_index[type]++ << ACPI_DISPLAY_INDEX_SHIFT;
283
284 connector->acpi_device_id = device_id;
285 }
286 drm_connector_list_iter_end(&conn_iter);
287 }
288
289 /* NOTE: The connector order must be final before this is called. */
intel_acpi_assign_connector_fwnodes(struct intel_display * display)290 void intel_acpi_assign_connector_fwnodes(struct intel_display *display)
291 {
292 struct drm_device *drm_dev = display->drm;
293 struct drm_connector_list_iter conn_iter;
294 struct fwnode_handle *fwnode = NULL;
295 struct drm_connector *connector;
296 struct acpi_device *adev;
297
298 drm_connector_list_iter_begin(drm_dev, &conn_iter);
299 drm_for_each_connector_iter(connector, &conn_iter) {
300 /* Always getting the next, even when the last was not used. */
301 fwnode = device_get_next_child_node(drm_dev->dev, fwnode);
302 if (!fwnode)
303 break;
304
305 switch (connector->connector_type) {
306 case DRM_MODE_CONNECTOR_LVDS:
307 case DRM_MODE_CONNECTOR_eDP:
308 case DRM_MODE_CONNECTOR_DSI:
309 /*
310 * Integrated displays have a specific address 0x1f on
311 * most Intel platforms, but not on all of them.
312 */
313 adev = acpi_find_child_device(ACPI_COMPANION(drm_dev->dev),
314 0x1f, 0);
315 if (adev) {
316 connector->fwnode =
317 fwnode_handle_get(acpi_fwnode_handle(adev));
318 break;
319 }
320 fallthrough;
321 default:
322 connector->fwnode = fwnode_handle_get(fwnode);
323 break;
324 }
325 }
326 drm_connector_list_iter_end(&conn_iter);
327 /*
328 * device_get_next_child_node() takes a reference on the fwnode, if
329 * we stopped iterating because we are out of connectors we need to
330 * put this, otherwise fwnode is NULL and the put is a no-op.
331 */
332 fwnode_handle_put(fwnode);
333 }
334
intel_acpi_video_register(struct intel_display * display)335 void intel_acpi_video_register(struct intel_display *display)
336 {
337 struct drm_connector_list_iter conn_iter;
338 struct drm_connector *connector;
339
340 acpi_video_register();
341
342 /*
343 * If i915 is driving an internal panel without registering its native
344 * backlight handler try to register the acpi_video backlight.
345 * For panels not driven by i915 another GPU driver may still register
346 * a native backlight later and acpi_video_register_backlight() should
347 * only be called after any native backlights have been registered.
348 */
349 drm_connector_list_iter_begin(display->drm, &conn_iter);
350 drm_for_each_connector_iter(connector, &conn_iter) {
351 struct intel_panel *panel = &to_intel_connector(connector)->panel;
352
353 if (panel->backlight.funcs && !panel->backlight.device) {
354 acpi_video_register_backlight();
355 break;
356 }
357 }
358 drm_connector_list_iter_end(&conn_iter);
359 }
360