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_utils.h"
13 #include "intel_acpi.h"
14 #include "intel_display_core.h"
15 #include "intel_display_types.h"
16
17 #define INTEL_DSM_REVISION_ID 1 /* For Calpella anyway... */
18 #define INTEL_DSM_FN_PLATFORM_MUX_INFO 1 /* No args */
19
20 static const guid_t intel_dsm_guid =
21 GUID_INIT(0x7ed873d3, 0xc2d0, 0x4e4f,
22 0xa8, 0x54, 0x0f, 0x13, 0x17, 0xb0, 0x1c, 0x2c);
23
24 #define INTEL_DSM_FN_GET_BIOS_DATA_FUNCS_SUPPORTED 0 /* No args */
25
26 static const guid_t intel_dsm_guid2 =
27 GUID_INIT(0x3e5b41c6, 0xeb1d, 0x4260,
28 0x9d, 0x15, 0xc7, 0x1f, 0xba, 0xda, 0xe4, 0x14);
29
intel_dsm_port_name(u8 id)30 static char *intel_dsm_port_name(u8 id)
31 {
32 switch (id) {
33 case 0:
34 return "Reserved";
35 case 1:
36 return "Analog VGA";
37 case 2:
38 return "LVDS";
39 case 3:
40 return "Reserved";
41 case 4:
42 return "HDMI/DVI_B";
43 case 5:
44 return "HDMI/DVI_C";
45 case 6:
46 return "HDMI/DVI_D";
47 case 7:
48 return "DisplayPort_A";
49 case 8:
50 return "DisplayPort_B";
51 case 9:
52 return "DisplayPort_C";
53 case 0xa:
54 return "DisplayPort_D";
55 case 0xb:
56 case 0xc:
57 case 0xd:
58 return "Reserved";
59 case 0xe:
60 return "WiDi";
61 default:
62 return "bad type";
63 }
64 }
65
intel_dsm_mux_type(u8 type)66 static char *intel_dsm_mux_type(u8 type)
67 {
68 switch (type) {
69 case 0:
70 return "unknown";
71 case 1:
72 return "No MUX, iGPU only";
73 case 2:
74 return "No MUX, dGPU only";
75 case 3:
76 return "MUXed between iGPU and dGPU";
77 default:
78 return "bad type";
79 }
80 }
81
intel_dsm_platform_mux_info(acpi_handle dhandle)82 static void intel_dsm_platform_mux_info(acpi_handle dhandle)
83 {
84 int i;
85 union acpi_object *pkg, *connector_count;
86
87 pkg = acpi_evaluate_dsm_typed(dhandle, &intel_dsm_guid,
88 INTEL_DSM_REVISION_ID, INTEL_DSM_FN_PLATFORM_MUX_INFO,
89 NULL, ACPI_TYPE_PACKAGE);
90 if (!pkg) {
91 DRM_DEBUG_DRIVER("failed to evaluate _DSM\n");
92 return;
93 }
94
95 if (!pkg->package.count) {
96 DRM_DEBUG_DRIVER("no connection in _DSM\n");
97 return;
98 }
99
100 connector_count = &pkg->package.elements[0];
101 DRM_DEBUG_DRIVER("MUX info connectors: %lld\n",
102 (unsigned long long)connector_count->integer.value);
103 for (i = 1; i < pkg->package.count; i++) {
104 union acpi_object *obj = &pkg->package.elements[i];
105 union acpi_object *connector_id;
106 union acpi_object *info;
107
108 if (obj->type != ACPI_TYPE_PACKAGE || obj->package.count < 2) {
109 DRM_DEBUG_DRIVER("Invalid object for MUX #%d\n", i);
110 continue;
111 }
112
113 connector_id = &obj->package.elements[0];
114 info = &obj->package.elements[1];
115 if (info->type != ACPI_TYPE_BUFFER || info->buffer.length < 4) {
116 DRM_DEBUG_DRIVER("Invalid info for MUX obj #%d\n", i);
117 continue;
118 }
119
120 DRM_DEBUG_DRIVER("Connector id: 0x%016llx\n",
121 (unsigned long long)connector_id->integer.value);
122 DRM_DEBUG_DRIVER(" port id: %s\n",
123 intel_dsm_port_name(info->buffer.pointer[0]));
124 DRM_DEBUG_DRIVER(" display mux info: %s\n",
125 intel_dsm_mux_type(info->buffer.pointer[1]));
126 DRM_DEBUG_DRIVER(" aux/dc mux info: %s\n",
127 intel_dsm_mux_type(info->buffer.pointer[2]));
128 DRM_DEBUG_DRIVER(" hpd mux info: %s\n",
129 intel_dsm_mux_type(info->buffer.pointer[3]));
130 }
131
132 ACPI_FREE(pkg);
133 }
134
intel_dsm_pci_probe(struct pci_dev * pdev)135 static acpi_handle intel_dsm_pci_probe(struct pci_dev *pdev)
136 {
137 acpi_handle dhandle;
138
139 dhandle = ACPI_HANDLE(&pdev->dev);
140 if (!dhandle)
141 return NULL;
142
143 if (!acpi_check_dsm(dhandle, &intel_dsm_guid, INTEL_DSM_REVISION_ID,
144 1 << INTEL_DSM_FN_PLATFORM_MUX_INFO)) {
145 DRM_DEBUG_KMS("no _DSM method for intel device\n");
146 return NULL;
147 }
148
149 intel_dsm_platform_mux_info(dhandle);
150
151 return dhandle;
152 }
153
intel_dsm_detect(void)154 static bool intel_dsm_detect(void)
155 {
156 acpi_handle dhandle = NULL;
157 char acpi_method_name[255] = {};
158 struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
159 struct pci_dev *pdev = NULL;
160 int vga_count = 0;
161
162 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
163 vga_count++;
164 dhandle = intel_dsm_pci_probe(pdev) ?: dhandle;
165 }
166
167 if (vga_count == 2 && dhandle) {
168 acpi_get_name(dhandle, ACPI_FULL_PATHNAME, &buffer);
169 DRM_DEBUG_DRIVER("vga_switcheroo: detected DSM switching method %s handle\n",
170 acpi_method_name);
171 return true;
172 }
173
174 return false;
175 }
176
intel_register_dsm_handler(void)177 void intel_register_dsm_handler(void)
178 {
179 if (!intel_dsm_detect())
180 return;
181 }
182
intel_unregister_dsm_handler(void)183 void intel_unregister_dsm_handler(void)
184 {
185 }
186
intel_dsm_get_bios_data_funcs_supported(struct intel_display * display)187 void intel_dsm_get_bios_data_funcs_supported(struct intel_display *display)
188 {
189 struct pci_dev *pdev = to_pci_dev(display->drm->dev);
190 acpi_handle dhandle;
191 union acpi_object *obj;
192
193 dhandle = ACPI_HANDLE(&pdev->dev);
194 if (!dhandle)
195 return;
196
197 obj = acpi_evaluate_dsm(dhandle, &intel_dsm_guid2, INTEL_DSM_REVISION_ID,
198 INTEL_DSM_FN_GET_BIOS_DATA_FUNCS_SUPPORTED, NULL);
199 if (obj)
200 ACPI_FREE(obj);
201 }
202
203 /*
204 * ACPI Specification, Revision 5.0, Appendix B.3.2 _DOD (Enumerate All Devices
205 * Attached to the Display Adapter).
206 */
207 #define ACPI_DISPLAY_INDEX_SHIFT 0
208 #define ACPI_DISPLAY_INDEX_MASK (0xf << 0)
209 #define ACPI_DISPLAY_PORT_ATTACHMENT_SHIFT 4
210 #define ACPI_DISPLAY_PORT_ATTACHMENT_MASK (0xf << 4)
211 #define ACPI_DISPLAY_TYPE_SHIFT 8
212 #define ACPI_DISPLAY_TYPE_MASK (0xf << 8)
213 #define ACPI_DISPLAY_TYPE_OTHER (0 << 8)
214 #define ACPI_DISPLAY_TYPE_VGA (1 << 8)
215 #define ACPI_DISPLAY_TYPE_TV (2 << 8)
216 #define ACPI_DISPLAY_TYPE_EXTERNAL_DIGITAL (3 << 8)
217 #define ACPI_DISPLAY_TYPE_INTERNAL_DIGITAL (4 << 8)
218 #define ACPI_VENDOR_SPECIFIC_SHIFT 12
219 #define ACPI_VENDOR_SPECIFIC_MASK (0xf << 12)
220 #define ACPI_BIOS_CAN_DETECT (1 << 16)
221 #define ACPI_DEPENDS_ON_VGA (1 << 17)
222 #define ACPI_PIPE_ID_SHIFT 18
223 #define ACPI_PIPE_ID_MASK (7 << 18)
224 #define ACPI_DEVICE_ID_SCHEME (1ULL << 31)
225
acpi_display_type(struct intel_connector * connector)226 static u32 acpi_display_type(struct intel_connector *connector)
227 {
228 u32 display_type;
229
230 switch (connector->base.connector_type) {
231 case DRM_MODE_CONNECTOR_VGA:
232 case DRM_MODE_CONNECTOR_DVIA:
233 display_type = ACPI_DISPLAY_TYPE_VGA;
234 break;
235 case DRM_MODE_CONNECTOR_Composite:
236 case DRM_MODE_CONNECTOR_SVIDEO:
237 case DRM_MODE_CONNECTOR_Component:
238 case DRM_MODE_CONNECTOR_9PinDIN:
239 case DRM_MODE_CONNECTOR_TV:
240 display_type = ACPI_DISPLAY_TYPE_TV;
241 break;
242 case DRM_MODE_CONNECTOR_DVII:
243 case DRM_MODE_CONNECTOR_DVID:
244 case DRM_MODE_CONNECTOR_DisplayPort:
245 case DRM_MODE_CONNECTOR_HDMIA:
246 case DRM_MODE_CONNECTOR_HDMIB:
247 display_type = ACPI_DISPLAY_TYPE_EXTERNAL_DIGITAL;
248 break;
249 case DRM_MODE_CONNECTOR_LVDS:
250 case DRM_MODE_CONNECTOR_eDP:
251 case DRM_MODE_CONNECTOR_DSI:
252 display_type = ACPI_DISPLAY_TYPE_INTERNAL_DIGITAL;
253 break;
254 case DRM_MODE_CONNECTOR_Unknown:
255 case DRM_MODE_CONNECTOR_VIRTUAL:
256 display_type = ACPI_DISPLAY_TYPE_OTHER;
257 break;
258 default:
259 MISSING_CASE(connector->base.connector_type);
260 display_type = ACPI_DISPLAY_TYPE_OTHER;
261 break;
262 }
263
264 return display_type;
265 }
266
intel_acpi_device_id_update(struct intel_display * display)267 void intel_acpi_device_id_update(struct intel_display *display)
268 {
269 struct intel_connector *connector;
270 struct drm_connector_list_iter conn_iter;
271 u8 display_index[16] = {};
272
273 /* Populate the ACPI IDs for all connectors for a given drm_device */
274 drm_connector_list_iter_begin(display->drm, &conn_iter);
275 for_each_intel_connector_iter(connector, &conn_iter) {
276 u32 device_id, type;
277
278 device_id = acpi_display_type(connector);
279
280 /* Use display type specific display index. */
281 type = (device_id & ACPI_DISPLAY_TYPE_MASK)
282 >> ACPI_DISPLAY_TYPE_SHIFT;
283 device_id |= display_index[type]++ << ACPI_DISPLAY_INDEX_SHIFT;
284
285 connector->acpi_device_id = device_id;
286 }
287 drm_connector_list_iter_end(&conn_iter);
288 }
289
290 /* NOTE: The connector order must be final before this is called. */
intel_acpi_assign_connector_fwnodes(struct intel_display * display)291 void intel_acpi_assign_connector_fwnodes(struct intel_display *display)
292 {
293 struct drm_device *drm_dev = display->drm;
294 struct drm_connector_list_iter conn_iter;
295 struct fwnode_handle *fwnode = NULL;
296 struct drm_connector *connector;
297 struct acpi_device *adev;
298
299 drm_connector_list_iter_begin(drm_dev, &conn_iter);
300 drm_for_each_connector_iter(connector, &conn_iter) {
301 /* Always getting the next, even when the last was not used. */
302 fwnode = device_get_next_child_node(drm_dev->dev, fwnode);
303 if (!fwnode)
304 break;
305
306 switch (connector->connector_type) {
307 case DRM_MODE_CONNECTOR_LVDS:
308 case DRM_MODE_CONNECTOR_eDP:
309 case DRM_MODE_CONNECTOR_DSI:
310 /*
311 * Integrated displays have a specific address 0x1f on
312 * most Intel platforms, but not on all of them.
313 */
314 adev = acpi_find_child_device(ACPI_COMPANION(drm_dev->dev),
315 0x1f, 0);
316 if (adev) {
317 connector->fwnode =
318 fwnode_handle_get(acpi_fwnode_handle(adev));
319 break;
320 }
321 fallthrough;
322 default:
323 connector->fwnode = fwnode_handle_get(fwnode);
324 break;
325 }
326 }
327 drm_connector_list_iter_end(&conn_iter);
328 /*
329 * device_get_next_child_node() takes a reference on the fwnode, if
330 * we stopped iterating because we are out of connectors we need to
331 * put this, otherwise fwnode is NULL and the put is a no-op.
332 */
333 fwnode_handle_put(fwnode);
334 }
335
intel_acpi_video_register(struct intel_display * display)336 void intel_acpi_video_register(struct intel_display *display)
337 {
338 struct drm_connector_list_iter conn_iter;
339 struct drm_connector *connector;
340
341 acpi_video_register();
342
343 /*
344 * If i915 is driving an internal panel without registering its native
345 * backlight handler try to register the acpi_video backlight.
346 * For panels not driven by i915 another GPU driver may still register
347 * a native backlight later and acpi_video_register_backlight() should
348 * only be called after any native backlights have been registered.
349 */
350 drm_connector_list_iter_begin(display->drm, &conn_iter);
351 drm_for_each_connector_iter(connector, &conn_iter) {
352 struct intel_panel *panel = &to_intel_connector(connector)->panel;
353
354 if (panel->backlight.funcs && !panel->backlight.device) {
355 acpi_video_register_backlight();
356 break;
357 }
358 }
359 drm_connector_list_iter_end(&conn_iter);
360 }
361