1 // SPDX-License-Identifier: GPL-2.0
5 * _DSM related code stolen from nouveau_acpi.c.
9 #include <linux/acpi.h>
10 #include <acpi/video.h>
13 #include "intel_acpi.h"
14 #include "intel_display_types.h"
16 #define INTEL_DSM_REVISION_ID 1 /* For Calpella anyway... */
17 #define INTEL_DSM_FN_PLATFORM_MUX_INFO 1 /* No args */
19 static const guid_t intel_dsm_guid =
20 GUID_INIT(0x7ed873d3, 0xc2d0, 0x4e4f,
21 0xa8, 0x54, 0x0f, 0x13, 0x17, 0xb0, 0x1c, 0x2c);
23 #define INTEL_DSM_FN_GET_BIOS_DATA_FUNCS_SUPPORTED 0 /* No args */
25 static const guid_t intel_dsm_guid2 =
26 GUID_INIT(0x3e5b41c6, 0xeb1d, 0x4260,
27 0x9d, 0x15, 0xc7, 0x1f, 0xba, 0xda, 0xe4, 0x14);
29 static char *intel_dsm_port_name(u8 id)
47 return "DisplayPort_A";
49 return "DisplayPort_B";
51 return "DisplayPort_C";
53 return "DisplayPort_D";
65 static char *intel_dsm_mux_type(u8 type)
71 return "No MUX, iGPU only";
73 return "No MUX, dGPU only";
75 return "MUXed between iGPU and dGPU";
81 static void intel_dsm_platform_mux_info(acpi_handle dhandle)
84 union acpi_object *pkg, *connector_count;
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);
90 DRM_DEBUG_DRIVER("failed to evaluate _DSM\n");
94 if (!pkg->package.count) {
95 DRM_DEBUG_DRIVER("no connection in _DSM\n");
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;
107 if (obj->type != ACPI_TYPE_PACKAGE || obj->package.count < 2) {
108 DRM_DEBUG_DRIVER("Invalid object for MUX #%d\n", i);
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);
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]));
134 static acpi_handle intel_dsm_pci_probe(struct pci_dev *pdev)
138 dhandle = ACPI_HANDLE(&pdev->dev);
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");
148 intel_dsm_platform_mux_info(dhandle);
153 static bool intel_dsm_detect(void)
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;
161 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
163 dhandle = intel_dsm_pci_probe(pdev) ?: dhandle;
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",
176 void intel_register_dsm_handler(void)
178 if (!intel_dsm_detect())
182 void intel_unregister_dsm_handler(void)
186 void intel_dsm_get_bios_data_funcs_supported(struct drm_i915_private *i915)
188 struct pci_dev *pdev = to_pci_dev(i915->drm.dev);
190 union acpi_object *obj;
192 dhandle = ACPI_HANDLE(&pdev->dev);
196 obj = acpi_evaluate_dsm(dhandle, &intel_dsm_guid2, INTEL_DSM_REVISION_ID,
197 INTEL_DSM_FN_GET_BIOS_DATA_FUNCS_SUPPORTED, NULL);
203 * ACPI Specification, Revision 5.0, Appendix B.3.2 _DOD (Enumerate All Devices
204 * Attached to the Display Adapter).
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)
225 static u32 acpi_display_type(struct intel_connector *connector)
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;
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;
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;
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;
253 case DRM_MODE_CONNECTOR_Unknown:
254 case DRM_MODE_CONNECTOR_VIRTUAL:
255 display_type = ACPI_DISPLAY_TYPE_OTHER;
258 MISSING_CASE(connector->base.connector_type);
259 display_type = ACPI_DISPLAY_TYPE_OTHER;
266 void intel_acpi_device_id_update(struct drm_i915_private *dev_priv)
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] = {};
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) {
278 device_id = acpi_display_type(connector);
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;
285 connector->acpi_device_id = device_id;
287 drm_connector_list_iter_end(&conn_iter);
290 /* NOTE: The connector order must be final before this is called. */
291 void intel_acpi_assign_connector_fwnodes(struct drm_i915_private *i915)
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;
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);
306 switch (connector->connector_type) {
307 case DRM_MODE_CONNECTOR_LVDS:
308 case DRM_MODE_CONNECTOR_eDP:
309 case DRM_MODE_CONNECTOR_DSI:
311 * Integrated displays have a specific address 0x1f on
312 * most Intel platforms, but not on all of them.
314 adev = acpi_find_child_device(ACPI_COMPANION(drm_dev->dev),
318 fwnode_handle_get(acpi_fwnode_handle(adev));
323 connector->fwnode = fwnode_handle_get(fwnode);
327 drm_connector_list_iter_end(&conn_iter);
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.
333 fwnode_handle_put(fwnode);
336 void intel_acpi_video_register(struct drm_i915_private *i915)
338 struct drm_connector_list_iter conn_iter;
339 struct drm_connector *connector;
341 acpi_video_register();
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.
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;
354 if (panel->backlight.funcs && !panel->backlight.device) {
355 acpi_video_register_backlight();
359 drm_connector_list_iter_end(&conn_iter);