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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
11#include "i915_drv.h"
12#include "intel_acpi.h"
13#include "intel_display_types.h"
14
15#define INTEL_DSM_REVISION_ID 1 /* For Calpella anyway... */
16#define INTEL_DSM_FN_PLATFORM_MUX_INFO 1 /* No args */
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 * ACPI Specification, Revision 5.0, Appendix B.3.2 _DOD (Enumerate All Devices
181 * Attached to the Display Adapter).
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 /* Populate the ACPI IDs for all connectors for a given drm_device */
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 /* Use display type specific display index. */
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}
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
19static 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
25static const guid_t intel_dsm_guid2 =
26 GUID_INIT(0x3e5b41c6, 0xeb1d, 0x4260,
27 0x9d, 0x15, 0xc7, 0x1f, 0xba, 0xda, 0xe4, 0x14);
28
29static 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
65static 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
81static 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
134static 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
153static bool intel_dsm_detect(void)
154{
155 acpi_handle dhandle = NULL;
156 char acpi_method_name[255] = { 0 };
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
176void intel_register_dsm_handler(void)
177{
178 if (!intel_dsm_detect())
179 return;
180}
181
182void intel_unregister_dsm_handler(void)
183{
184}
185
186void intel_dsm_get_bios_data_funcs_supported(struct drm_i915_private *i915)
187{
188 struct pci_dev *pdev = to_pci_dev(i915->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
225static 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
266void intel_acpi_device_id_update(struct drm_i915_private *dev_priv)
267{
268 struct drm_device *drm_dev = &dev_priv->drm;
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(drm_dev, &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. */
291void intel_acpi_assign_connector_fwnodes(struct drm_i915_private *i915)
292{
293 struct drm_connector_list_iter conn_iter;
294 struct drm_device *drm_dev = &i915->drm;
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
336void intel_acpi_video_register(struct drm_i915_private *i915)
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(&i915->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}