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 <drm/drm_print.h>
13
14 #include "intel_acpi.h"
15 #include "intel_display_core.h"
16 #include "intel_display_types.h"
17 #include "intel_display_utils.h"
18
19 #define INTEL_DSM_REVISION_ID 1 /* For Calpella anyway... */
20 #define INTEL_DSM_FN_PLATFORM_MUX_INFO 1 /* No args */
21
22 static const guid_t intel_dsm_guid =
23 GUID_INIT(0x7ed873d3, 0xc2d0, 0x4e4f,
24 0xa8, 0x54, 0x0f, 0x13, 0x17, 0xb0, 0x1c, 0x2c);
25
26 #define INTEL_DSM_FN_GET_BIOS_DATA_FUNCS_SUPPORTED 0 /* No args */
27
28 static const guid_t intel_dsm_guid2 =
29 GUID_INIT(0x3e5b41c6, 0xeb1d, 0x4260,
30 0x9d, 0x15, 0xc7, 0x1f, 0xba, 0xda, 0xe4, 0x14);
31
intel_dsm_port_name(u8 id)32 static char *intel_dsm_port_name(u8 id)
33 {
34 switch (id) {
35 case 0:
36 return "Reserved";
37 case 1:
38 return "Analog VGA";
39 case 2:
40 return "LVDS";
41 case 3:
42 return "Reserved";
43 case 4:
44 return "HDMI/DVI_B";
45 case 5:
46 return "HDMI/DVI_C";
47 case 6:
48 return "HDMI/DVI_D";
49 case 7:
50 return "DisplayPort_A";
51 case 8:
52 return "DisplayPort_B";
53 case 9:
54 return "DisplayPort_C";
55 case 0xa:
56 return "DisplayPort_D";
57 case 0xb:
58 case 0xc:
59 case 0xd:
60 return "Reserved";
61 case 0xe:
62 return "WiDi";
63 default:
64 return "bad type";
65 }
66 }
67
intel_dsm_mux_type(u8 type)68 static char *intel_dsm_mux_type(u8 type)
69 {
70 switch (type) {
71 case 0:
72 return "unknown";
73 case 1:
74 return "No MUX, iGPU only";
75 case 2:
76 return "No MUX, dGPU only";
77 case 3:
78 return "MUXed between iGPU and dGPU";
79 default:
80 return "bad type";
81 }
82 }
83
intel_dsm_platform_mux_info(acpi_handle dhandle)84 static void intel_dsm_platform_mux_info(acpi_handle dhandle)
85 {
86 int i;
87 union acpi_object *pkg, *connector_count;
88
89 pkg = acpi_evaluate_dsm_typed(dhandle, &intel_dsm_guid,
90 INTEL_DSM_REVISION_ID, INTEL_DSM_FN_PLATFORM_MUX_INFO,
91 NULL, ACPI_TYPE_PACKAGE);
92 if (!pkg) {
93 DRM_DEBUG_DRIVER("failed to evaluate _DSM\n");
94 return;
95 }
96
97 if (!pkg->package.count) {
98 DRM_DEBUG_DRIVER("no connection in _DSM\n");
99 ACPI_FREE(pkg);
100 return;
101 }
102
103 connector_count = &pkg->package.elements[0];
104 DRM_DEBUG_DRIVER("MUX info connectors: %lld\n",
105 (unsigned long long)connector_count->integer.value);
106 for (i = 1; i < pkg->package.count; i++) {
107 union acpi_object *obj = &pkg->package.elements[i];
108 union acpi_object *connector_id;
109 union acpi_object *info;
110
111 if (obj->type != ACPI_TYPE_PACKAGE || obj->package.count < 2) {
112 DRM_DEBUG_DRIVER("Invalid object for MUX #%d\n", i);
113 continue;
114 }
115
116 connector_id = &obj->package.elements[0];
117 info = &obj->package.elements[1];
118 if (info->type != ACPI_TYPE_BUFFER || info->buffer.length < 4) {
119 DRM_DEBUG_DRIVER("Invalid info for MUX obj #%d\n", i);
120 continue;
121 }
122
123 DRM_DEBUG_DRIVER("Connector id: 0x%016llx\n",
124 (unsigned long long)connector_id->integer.value);
125 DRM_DEBUG_DRIVER(" port id: %s\n",
126 intel_dsm_port_name(info->buffer.pointer[0]));
127 DRM_DEBUG_DRIVER(" display mux info: %s\n",
128 intel_dsm_mux_type(info->buffer.pointer[1]));
129 DRM_DEBUG_DRIVER(" aux/dc mux info: %s\n",
130 intel_dsm_mux_type(info->buffer.pointer[2]));
131 DRM_DEBUG_DRIVER(" hpd mux info: %s\n",
132 intel_dsm_mux_type(info->buffer.pointer[3]));
133 }
134
135 ACPI_FREE(pkg);
136 }
137
intel_dsm_pci_probe(struct pci_dev * pdev)138 static acpi_handle intel_dsm_pci_probe(struct pci_dev *pdev)
139 {
140 acpi_handle dhandle;
141
142 dhandle = ACPI_HANDLE(&pdev->dev);
143 if (!dhandle)
144 return NULL;
145
146 if (!acpi_check_dsm(dhandle, &intel_dsm_guid, INTEL_DSM_REVISION_ID,
147 1 << INTEL_DSM_FN_PLATFORM_MUX_INFO)) {
148 DRM_DEBUG_KMS("no _DSM method for intel device\n");
149 return NULL;
150 }
151
152 intel_dsm_platform_mux_info(dhandle);
153
154 return dhandle;
155 }
156
intel_dsm_detect(void)157 static bool intel_dsm_detect(void)
158 {
159 acpi_handle dhandle = NULL;
160 char acpi_method_name[255] = {};
161 struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
162 struct pci_dev *pdev = NULL;
163 int vga_count = 0;
164
165 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
166 vga_count++;
167 dhandle = intel_dsm_pci_probe(pdev) ?: dhandle;
168 }
169
170 if (vga_count == 2 && dhandle) {
171 acpi_get_name(dhandle, ACPI_FULL_PATHNAME, &buffer);
172 DRM_DEBUG_DRIVER("vga_switcheroo: detected DSM switching method %s handle\n",
173 acpi_method_name);
174 return true;
175 }
176
177 return false;
178 }
179
intel_register_dsm_handler(void)180 void intel_register_dsm_handler(void)
181 {
182 if (!intel_dsm_detect())
183 return;
184 }
185
intel_unregister_dsm_handler(void)186 void intel_unregister_dsm_handler(void)
187 {
188 }
189
intel_dsm_get_bios_data_funcs_supported(struct intel_display * display)190 void intel_dsm_get_bios_data_funcs_supported(struct intel_display *display)
191 {
192 struct pci_dev *pdev = to_pci_dev(display->drm->dev);
193 acpi_handle dhandle;
194 union acpi_object *obj;
195
196 dhandle = ACPI_HANDLE(&pdev->dev);
197 if (!dhandle)
198 return;
199
200 obj = acpi_evaluate_dsm(dhandle, &intel_dsm_guid2, INTEL_DSM_REVISION_ID,
201 INTEL_DSM_FN_GET_BIOS_DATA_FUNCS_SUPPORTED, NULL);
202 if (obj)
203 ACPI_FREE(obj);
204 }
205
206 /*
207 * ACPI Specification, Revision 5.0, Appendix B.3.2 _DOD (Enumerate All Devices
208 * Attached to the Display Adapter).
209 */
210 #define ACPI_DISPLAY_INDEX_SHIFT 0
211 #define ACPI_DISPLAY_INDEX_MASK (0xf << 0)
212 #define ACPI_DISPLAY_PORT_ATTACHMENT_SHIFT 4
213 #define ACPI_DISPLAY_PORT_ATTACHMENT_MASK (0xf << 4)
214 #define ACPI_DISPLAY_TYPE_SHIFT 8
215 #define ACPI_DISPLAY_TYPE_MASK (0xf << 8)
216 #define ACPI_DISPLAY_TYPE_OTHER (0 << 8)
217 #define ACPI_DISPLAY_TYPE_VGA (1 << 8)
218 #define ACPI_DISPLAY_TYPE_TV (2 << 8)
219 #define ACPI_DISPLAY_TYPE_EXTERNAL_DIGITAL (3 << 8)
220 #define ACPI_DISPLAY_TYPE_INTERNAL_DIGITAL (4 << 8)
221 #define ACPI_VENDOR_SPECIFIC_SHIFT 12
222 #define ACPI_VENDOR_SPECIFIC_MASK (0xf << 12)
223 #define ACPI_BIOS_CAN_DETECT (1 << 16)
224 #define ACPI_DEPENDS_ON_VGA (1 << 17)
225 #define ACPI_PIPE_ID_SHIFT 18
226 #define ACPI_PIPE_ID_MASK (7 << 18)
227 #define ACPI_DEVICE_ID_SCHEME (1ULL << 31)
228
acpi_display_type(struct intel_connector * connector)229 static u32 acpi_display_type(struct intel_connector *connector)
230 {
231 u32 display_type;
232
233 switch (connector->base.connector_type) {
234 case DRM_MODE_CONNECTOR_VGA:
235 case DRM_MODE_CONNECTOR_DVIA:
236 display_type = ACPI_DISPLAY_TYPE_VGA;
237 break;
238 case DRM_MODE_CONNECTOR_Composite:
239 case DRM_MODE_CONNECTOR_SVIDEO:
240 case DRM_MODE_CONNECTOR_Component:
241 case DRM_MODE_CONNECTOR_9PinDIN:
242 case DRM_MODE_CONNECTOR_TV:
243 display_type = ACPI_DISPLAY_TYPE_TV;
244 break;
245 case DRM_MODE_CONNECTOR_DVII:
246 case DRM_MODE_CONNECTOR_DVID:
247 case DRM_MODE_CONNECTOR_DisplayPort:
248 case DRM_MODE_CONNECTOR_HDMIA:
249 case DRM_MODE_CONNECTOR_HDMIB:
250 display_type = ACPI_DISPLAY_TYPE_EXTERNAL_DIGITAL;
251 break;
252 case DRM_MODE_CONNECTOR_LVDS:
253 case DRM_MODE_CONNECTOR_eDP:
254 case DRM_MODE_CONNECTOR_DSI:
255 display_type = ACPI_DISPLAY_TYPE_INTERNAL_DIGITAL;
256 break;
257 case DRM_MODE_CONNECTOR_Unknown:
258 case DRM_MODE_CONNECTOR_VIRTUAL:
259 display_type = ACPI_DISPLAY_TYPE_OTHER;
260 break;
261 default:
262 MISSING_CASE(connector->base.connector_type);
263 display_type = ACPI_DISPLAY_TYPE_OTHER;
264 break;
265 }
266
267 return display_type;
268 }
269
intel_acpi_device_id_update(struct intel_display * display)270 void intel_acpi_device_id_update(struct intel_display *display)
271 {
272 struct intel_connector *connector;
273 struct drm_connector_list_iter conn_iter;
274 u8 display_index[16] = {};
275
276 /* Populate the ACPI IDs for all connectors for a given drm_device */
277 drm_connector_list_iter_begin(display->drm, &conn_iter);
278 for_each_intel_connector_iter(connector, &conn_iter) {
279 u32 device_id, type;
280
281 device_id = acpi_display_type(connector);
282
283 /* Use display type specific display index. */
284 type = (device_id & ACPI_DISPLAY_TYPE_MASK)
285 >> ACPI_DISPLAY_TYPE_SHIFT;
286 device_id |= display_index[type]++ << ACPI_DISPLAY_INDEX_SHIFT;
287
288 connector->acpi_device_id = device_id;
289 }
290 drm_connector_list_iter_end(&conn_iter);
291 }
292
293 /* NOTE: The connector order must be final before this is called. */
intel_acpi_assign_connector_fwnodes(struct intel_display * display)294 void intel_acpi_assign_connector_fwnodes(struct intel_display *display)
295 {
296 struct drm_device *drm_dev = display->drm;
297 struct drm_connector_list_iter conn_iter;
298 struct fwnode_handle *fwnode = NULL;
299 struct drm_connector *connector;
300 struct acpi_device *adev;
301
302 drm_connector_list_iter_begin(drm_dev, &conn_iter);
303 drm_for_each_connector_iter(connector, &conn_iter) {
304 /* Always getting the next, even when the last was not used. */
305 fwnode = device_get_next_child_node(drm_dev->dev, fwnode);
306 if (!fwnode)
307 break;
308
309 switch (connector->connector_type) {
310 case DRM_MODE_CONNECTOR_LVDS:
311 case DRM_MODE_CONNECTOR_eDP:
312 case DRM_MODE_CONNECTOR_DSI:
313 /*
314 * Integrated displays have a specific address 0x1f on
315 * most Intel platforms, but not on all of them.
316 */
317 adev = acpi_find_child_device(ACPI_COMPANION(drm_dev->dev),
318 0x1f, 0);
319 if (adev) {
320 connector->fwnode =
321 fwnode_handle_get(acpi_fwnode_handle(adev));
322 break;
323 }
324 fallthrough;
325 default:
326 connector->fwnode = fwnode_handle_get(fwnode);
327 break;
328 }
329 }
330 drm_connector_list_iter_end(&conn_iter);
331 /*
332 * device_get_next_child_node() takes a reference on the fwnode, if
333 * we stopped iterating because we are out of connectors we need to
334 * put this, otherwise fwnode is NULL and the put is a no-op.
335 */
336 fwnode_handle_put(fwnode);
337 }
338
intel_acpi_video_register(struct intel_display * display)339 void intel_acpi_video_register(struct intel_display *display)
340 {
341 struct drm_connector_list_iter conn_iter;
342 struct drm_connector *connector;
343
344 acpi_video_register();
345
346 /*
347 * If i915 is driving an internal panel without registering its native
348 * backlight handler try to register the acpi_video backlight.
349 * For panels not driven by i915 another GPU driver may still register
350 * a native backlight later and acpi_video_register_backlight() should
351 * only be called after any native backlights have been registered.
352 */
353 drm_connector_list_iter_begin(display->drm, &conn_iter);
354 drm_for_each_connector_iter(connector, &conn_iter) {
355 struct intel_panel *panel = &to_intel_connector(connector)->panel;
356
357 if (panel->backlight.funcs && !panel->backlight.device) {
358 acpi_video_register_backlight();
359 break;
360 }
361 }
362 drm_connector_list_iter_end(&conn_iter);
363 }
364