1
2#include <linux/pci.h>
3#include <linux/acpi.h>
4#include <linux/slab.h>
5#include <linux/mxm-wmi.h>
6#include <linux/vga_switcheroo.h>
7#include <drm/drm_edid.h>
8#include <acpi/video.h>
9
10#include "nouveau_drv.h"
11#include "nouveau_acpi.h"
12
13#define NOUVEAU_DSM_LED 0x02
14#define NOUVEAU_DSM_LED_STATE 0x00
15#define NOUVEAU_DSM_LED_OFF 0x10
16#define NOUVEAU_DSM_LED_STAMINA 0x11
17#define NOUVEAU_DSM_LED_SPEED 0x12
18
19#define NOUVEAU_DSM_POWER 0x03
20#define NOUVEAU_DSM_POWER_STATE 0x00
21#define NOUVEAU_DSM_POWER_SPEED 0x01
22#define NOUVEAU_DSM_POWER_STAMINA 0x02
23
24#define NOUVEAU_DSM_OPTIMUS_CAPS 0x1A
25#define NOUVEAU_DSM_OPTIMUS_FLAGS 0x1B
26
27#define NOUVEAU_DSM_OPTIMUS_POWERDOWN_PS3 (3 << 24)
28#define NOUVEAU_DSM_OPTIMUS_NO_POWERDOWN_PS3 (2 << 24)
29#define NOUVEAU_DSM_OPTIMUS_FLAGS_CHANGED (1)
30
31#define NOUVEAU_DSM_OPTIMUS_SET_POWERDOWN (NOUVEAU_DSM_OPTIMUS_POWERDOWN_PS3 | NOUVEAU_DSM_OPTIMUS_FLAGS_CHANGED)
32
33
34#define OPTIMUS_ENABLED (1 << 0)
35#define OPTIMUS_STATUS_MASK (3 << 3)
36#define OPTIMUS_STATUS_OFF (0 << 3)
37#define OPTIMUS_STATUS_ON_ENABLED (1 << 3)
38#define OPTIMUS_STATUS_PWR_STABLE (3 << 3)
39#define OPTIMUS_DISPLAY_HOTPLUG (1 << 6)
40#define OPTIMUS_CAPS_MASK (7 << 24)
41#define OPTIMUS_DYNAMIC_PWR_CAP (1 << 24)
42
43#define OPTIMUS_AUDIO_CAPS_MASK (3 << 27)
44#define OPTIMUS_HDA_CODEC_MASK (2 << 27)
45
46static struct nouveau_dsm_priv {
47 bool dsm_detected;
48 bool optimus_detected;
49 bool optimus_flags_detected;
50 bool optimus_skip_dsm;
51 acpi_handle dhandle;
52} nouveau_dsm_priv;
53
54bool nouveau_is_optimus(void) {
55 return nouveau_dsm_priv.optimus_detected;
56}
57
58bool nouveau_is_v1_dsm(void) {
59 return nouveau_dsm_priv.dsm_detected;
60}
61
62#ifdef CONFIG_VGA_SWITCHEROO
63static const guid_t nouveau_dsm_muid =
64 GUID_INIT(0x9D95A0A0, 0x0060, 0x4D48,
65 0xB3, 0x4D, 0x7E, 0x5F, 0xEA, 0x12, 0x9F, 0xD4);
66
67static const guid_t nouveau_op_dsm_muid =
68 GUID_INIT(0xA486D8F8, 0x0BDA, 0x471B,
69 0xA7, 0x2B, 0x60, 0x42, 0xA6, 0xB5, 0xBE, 0xE0);
70
71static int nouveau_optimus_dsm(acpi_handle handle, int func, int arg, uint32_t *result)
72{
73 int i;
74 union acpi_object *obj;
75 char args_buff[4];
76 union acpi_object argv4 = {
77 .buffer.type = ACPI_TYPE_BUFFER,
78 .buffer.length = 4,
79 .buffer.pointer = args_buff
80 };
81
82
83 for (i = 0; i < 4; i++)
84 args_buff[i] = (arg >> i * 8) & 0xFF;
85
86 *result = 0;
87 obj = acpi_evaluate_dsm_typed(handle, &nouveau_op_dsm_muid, 0x00000100,
88 func, &argv4, ACPI_TYPE_BUFFER);
89 if (!obj) {
90 acpi_handle_info(handle, "failed to evaluate _DSM\n");
91 return AE_ERROR;
92 } else {
93 if (obj->buffer.length == 4) {
94 *result |= obj->buffer.pointer[0];
95 *result |= (obj->buffer.pointer[1] << 8);
96 *result |= (obj->buffer.pointer[2] << 16);
97 *result |= (obj->buffer.pointer[3] << 24);
98 }
99 ACPI_FREE(obj);
100 }
101
102 return 0;
103}
104
105
106
107
108
109
110static int nouveau_dsm_get_optimus_functions(acpi_handle handle)
111{
112 int result;
113
114
115
116
117
118 if (nouveau_optimus_dsm(handle, 0, 0, &result))
119 return 0;
120
121
122
123
124
125 if (result & 1 && result & (1 << NOUVEAU_DSM_OPTIMUS_CAPS))
126 return result;
127 return 0;
128}
129
130static int nouveau_dsm(acpi_handle handle, int func, int arg)
131{
132 int ret = 0;
133 union acpi_object *obj;
134 union acpi_object argv4 = {
135 .integer.type = ACPI_TYPE_INTEGER,
136 .integer.value = arg,
137 };
138
139 obj = acpi_evaluate_dsm_typed(handle, &nouveau_dsm_muid, 0x00000102,
140 func, &argv4, ACPI_TYPE_INTEGER);
141 if (!obj) {
142 acpi_handle_info(handle, "failed to evaluate _DSM\n");
143 return AE_ERROR;
144 } else {
145 if (obj->integer.value == 0x80000002)
146 ret = -ENODEV;
147 ACPI_FREE(obj);
148 }
149
150 return ret;
151}
152
153static int nouveau_dsm_switch_mux(acpi_handle handle, int mux_id)
154{
155 mxm_wmi_call_mxmx(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
156 mxm_wmi_call_mxds(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
157 return nouveau_dsm(handle, NOUVEAU_DSM_LED, mux_id);
158}
159
160static int nouveau_dsm_set_discrete_state(acpi_handle handle, enum vga_switcheroo_state state)
161{
162 int arg;
163 if (state == VGA_SWITCHEROO_ON)
164 arg = NOUVEAU_DSM_POWER_SPEED;
165 else
166 arg = NOUVEAU_DSM_POWER_STAMINA;
167 nouveau_dsm(handle, NOUVEAU_DSM_POWER, arg);
168 return 0;
169}
170
171static int nouveau_dsm_switchto(enum vga_switcheroo_client_id id)
172{
173 if (!nouveau_dsm_priv.dsm_detected)
174 return 0;
175 if (id == VGA_SWITCHEROO_IGD)
176 return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_STAMINA);
177 else
178 return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_SPEED);
179}
180
181static int nouveau_dsm_power_state(enum vga_switcheroo_client_id id,
182 enum vga_switcheroo_state state)
183{
184 if (id == VGA_SWITCHEROO_IGD)
185 return 0;
186
187
188
189 if (!nouveau_dsm_priv.dsm_detected)
190 return 0;
191
192 return nouveau_dsm_set_discrete_state(nouveau_dsm_priv.dhandle, state);
193}
194
195static enum vga_switcheroo_client_id nouveau_dsm_get_client_id(struct pci_dev *pdev)
196{
197
198 if (pdev->vendor == PCI_VENDOR_ID_INTEL)
199 return VGA_SWITCHEROO_IGD;
200
201
202 if (pdev->bus->number == 0)
203 return VGA_SWITCHEROO_IGD;
204
205 return VGA_SWITCHEROO_DIS;
206}
207
208static const struct vga_switcheroo_handler nouveau_dsm_handler = {
209 .switchto = nouveau_dsm_switchto,
210 .power_state = nouveau_dsm_power_state,
211 .get_client_id = nouveau_dsm_get_client_id,
212};
213
214static void nouveau_dsm_pci_probe(struct pci_dev *pdev, acpi_handle *dhandle_out,
215 bool *has_mux, bool *has_opt,
216 bool *has_opt_flags, bool *has_pr3)
217{
218 acpi_handle dhandle;
219 bool supports_mux;
220 int optimus_funcs;
221 struct pci_dev *parent_pdev;
222
223 *has_pr3 = false;
224 parent_pdev = pci_upstream_bridge(pdev);
225 if (parent_pdev) {
226 if (parent_pdev->bridge_d3)
227 *has_pr3 = pci_pr3_present(parent_pdev);
228 else
229 pci_d3cold_disable(pdev);
230 }
231
232 dhandle = ACPI_HANDLE(&pdev->dev);
233 if (!dhandle)
234 return;
235
236 if (!acpi_has_method(dhandle, "_DSM"))
237 return;
238
239 supports_mux = acpi_check_dsm(dhandle, &nouveau_dsm_muid, 0x00000102,
240 1 << NOUVEAU_DSM_POWER);
241 optimus_funcs = nouveau_dsm_get_optimus_functions(dhandle);
242
243
244 if (!supports_mux && !optimus_funcs)
245 return;
246
247 *dhandle_out = dhandle;
248 *has_mux = supports_mux;
249 *has_opt = !!optimus_funcs;
250 *has_opt_flags = optimus_funcs & (1 << NOUVEAU_DSM_OPTIMUS_FLAGS);
251
252 if (optimus_funcs) {
253 uint32_t result;
254 nouveau_optimus_dsm(dhandle, NOUVEAU_DSM_OPTIMUS_CAPS, 0,
255 &result);
256 dev_info(&pdev->dev, "optimus capabilities: %s, status %s%s\n",
257 (result & OPTIMUS_ENABLED) ? "enabled" : "disabled",
258 (result & OPTIMUS_DYNAMIC_PWR_CAP) ? "dynamic power, " : "",
259 (result & OPTIMUS_HDA_CODEC_MASK) ? "hda bios codec supported" : "");
260 }
261}
262
263static bool nouveau_dsm_detect(void)
264{
265 char acpi_method_name[255] = { 0 };
266 struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
267 struct pci_dev *pdev = NULL;
268 acpi_handle dhandle = NULL;
269 bool has_mux = false;
270 bool has_optimus = false;
271 bool has_optimus_flags = false;
272 bool has_power_resources = false;
273 int vga_count = 0;
274 bool guid_valid;
275 bool ret = false;
276
277
278 guid_valid = mxm_wmi_supported();
279
280 if (guid_valid)
281 printk("MXM: GUID detected in BIOS\n");
282
283
284 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
285 vga_count++;
286
287 nouveau_dsm_pci_probe(pdev, &dhandle, &has_mux, &has_optimus,
288 &has_optimus_flags, &has_power_resources);
289 }
290
291 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_3D << 8, pdev)) != NULL) {
292 vga_count++;
293
294 nouveau_dsm_pci_probe(pdev, &dhandle, &has_mux, &has_optimus,
295 &has_optimus_flags, &has_power_resources);
296 }
297
298
299 if (has_optimus) {
300 nouveau_dsm_priv.dhandle = dhandle;
301 acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
302 &buffer);
303 pr_info("VGA switcheroo: detected Optimus DSM method %s handle\n",
304 acpi_method_name);
305 if (has_power_resources)
306 pr_info("nouveau: detected PR support, will not use DSM\n");
307 nouveau_dsm_priv.optimus_detected = true;
308 nouveau_dsm_priv.optimus_flags_detected = has_optimus_flags;
309 nouveau_dsm_priv.optimus_skip_dsm = has_power_resources;
310 ret = true;
311 } else if (vga_count == 2 && has_mux && guid_valid) {
312 nouveau_dsm_priv.dhandle = dhandle;
313 acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
314 &buffer);
315 pr_info("VGA switcheroo: detected DSM switching method %s handle\n",
316 acpi_method_name);
317 nouveau_dsm_priv.dsm_detected = true;
318 ret = true;
319 }
320
321
322 return ret;
323}
324
325void nouveau_register_dsm_handler(void)
326{
327 bool r;
328
329 r = nouveau_dsm_detect();
330 if (!r)
331 return;
332
333 vga_switcheroo_register_handler(&nouveau_dsm_handler, 0);
334}
335
336
337void nouveau_switcheroo_optimus_dsm(void)
338{
339 u32 result = 0;
340 if (!nouveau_dsm_priv.optimus_detected || nouveau_dsm_priv.optimus_skip_dsm)
341 return;
342
343 if (nouveau_dsm_priv.optimus_flags_detected)
344 nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_FLAGS,
345 0x3, &result);
346
347 nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_CAPS,
348 NOUVEAU_DSM_OPTIMUS_SET_POWERDOWN, &result);
349
350}
351
352void nouveau_unregister_dsm_handler(void)
353{
354 if (nouveau_dsm_priv.optimus_detected || nouveau_dsm_priv.dsm_detected)
355 vga_switcheroo_unregister_handler();
356}
357#else
358void nouveau_register_dsm_handler(void) {}
359void nouveau_unregister_dsm_handler(void) {}
360void nouveau_switcheroo_optimus_dsm(void) {}
361#endif
362
363void *
364nouveau_acpi_edid(struct drm_device *dev, struct drm_connector *connector)
365{
366 struct acpi_device *acpidev;
367 acpi_handle handle;
368 int type, ret;
369 void *edid;
370
371 switch (connector->connector_type) {
372 case DRM_MODE_CONNECTOR_LVDS:
373 case DRM_MODE_CONNECTOR_eDP:
374 type = ACPI_VIDEO_DISPLAY_LCD;
375 break;
376 default:
377 return NULL;
378 }
379
380 handle = ACPI_HANDLE(&dev->pdev->dev);
381 if (!handle)
382 return NULL;
383
384 ret = acpi_bus_get_device(handle, &acpidev);
385 if (ret)
386 return NULL;
387
388 ret = acpi_video_get_edid(acpidev, type, -1, &edid);
389 if (ret < 0)
390 return NULL;
391
392 return kmemdup(edid, EDID_LENGTH, GFP_KERNEL);
393}
394
