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] = {};
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}
361