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

source code of linux/drivers/gpu/drm/i915/display/intel_acpi.c