1#include <linux/pci.h>
2#include <linux/acpi.h>
3#include <linux/slab.h>
4#include <linux/mxm-wmi.h>
5#include <linux/vga_switcheroo.h>
6#include <drm/drm_edid.h>
7#include <acpi/video.h>
8
9#include "nouveau_drm.h"
10#include "nouveau_acpi.h"
11
12#define NOUVEAU_DSM_LED 0x02
13#define NOUVEAU_DSM_LED_STATE 0x00
14#define NOUVEAU_DSM_LED_OFF 0x10
15#define NOUVEAU_DSM_LED_STAMINA 0x11
16#define NOUVEAU_DSM_LED_SPEED 0x12
17
18#define NOUVEAU_DSM_POWER 0x03
19#define NOUVEAU_DSM_POWER_STATE 0x00
20#define NOUVEAU_DSM_POWER_SPEED 0x01
21#define NOUVEAU_DSM_POWER_STAMINA 0x02
22
23#define NOUVEAU_DSM_OPTIMUS_CAPS 0x1A
24#define NOUVEAU_DSM_OPTIMUS_FLAGS 0x1B
25
26#define NOUVEAU_DSM_OPTIMUS_POWERDOWN_PS3 (3 << 24)
27#define NOUVEAU_DSM_OPTIMUS_NO_POWERDOWN_PS3 (2 << 24)
28#define NOUVEAU_DSM_OPTIMUS_FLAGS_CHANGED (1)
29
30#define NOUVEAU_DSM_OPTIMUS_SET_POWERDOWN (NOUVEAU_DSM_OPTIMUS_POWERDOWN_PS3 | NOUVEAU_DSM_OPTIMUS_FLAGS_CHANGED)
31
32
33#define OPTIMUS_ENABLED (1 << 0)
34#define OPTIMUS_STATUS_MASK (3 << 3)
35#define OPTIMUS_STATUS_OFF (0 << 3)
36#define OPTIMUS_STATUS_ON_ENABLED (1 << 3)
37#define OPTIMUS_STATUS_PWR_STABLE (3 << 3)
38#define OPTIMUS_DISPLAY_HOTPLUG (1 << 6)
39#define OPTIMUS_CAPS_MASK (7 << 24)
40#define OPTIMUS_DYNAMIC_PWR_CAP (1 << 24)
41
42#define OPTIMUS_AUDIO_CAPS_MASK (3 << 27)
43#define OPTIMUS_HDA_CODEC_MASK (2 << 27)
44
45static struct nouveau_dsm_priv {
46 bool dsm_detected;
47 bool optimus_detected;
48 acpi_handle dhandle;
49 acpi_handle rom_handle;
50} nouveau_dsm_priv;
51
52bool nouveau_is_optimus(void) {
53 return nouveau_dsm_priv.optimus_detected;
54}
55
56bool nouveau_is_v1_dsm(void) {
57 return nouveau_dsm_priv.dsm_detected;
58}
59
60#define NOUVEAU_DSM_HAS_MUX 0x1
61#define NOUVEAU_DSM_HAS_OPT 0x2
62
63#ifdef CONFIG_VGA_SWITCHEROO
64static const char nouveau_dsm_muid[] = {
65 0xA0, 0xA0, 0x95, 0x9D, 0x60, 0x00, 0x48, 0x4D,
66 0xB3, 0x4D, 0x7E, 0x5F, 0xEA, 0x12, 0x9F, 0xD4,
67};
68
69static const char nouveau_op_dsm_muid[] = {
70 0xF8, 0xD8, 0x86, 0xA4, 0xDA, 0x0B, 0x1B, 0x47,
71 0xA7, 0x2B, 0x60, 0x42, 0xA6, 0xB5, 0xBE, 0xE0,
72};
73
74static int nouveau_optimus_dsm(acpi_handle handle, int func, int arg, uint32_t *result)
75{
76 int i;
77 union acpi_object *obj;
78 char args_buff[4];
79 union acpi_object argv4 = {
80 .buffer.type = ACPI_TYPE_BUFFER,
81 .buffer.length = 4,
82 .buffer.pointer = args_buff
83 };
84
85
86 for (i = 0; i < 4; i++)
87 args_buff[i] = (arg >> i * 8) & 0xFF;
88
89 *result = 0;
90 obj = acpi_evaluate_dsm_typed(handle, nouveau_op_dsm_muid, 0x00000100,
91 func, &argv4, ACPI_TYPE_BUFFER);
92 if (!obj) {
93 acpi_handle_info(handle, "failed to evaluate _DSM\n");
94 return AE_ERROR;
95 } else {
96 if (obj->buffer.length == 4) {
97 *result |= obj->buffer.pointer[0];
98 *result |= (obj->buffer.pointer[1] << 8);
99 *result |= (obj->buffer.pointer[2] << 16);
100 *result |= (obj->buffer.pointer[3] << 24);
101 }
102 ACPI_FREE(obj);
103 }
104
105 return 0;
106}
107
108
109
110
111
112
113static int nouveau_check_optimus_dsm(acpi_handle handle)
114{
115 int result;
116
117
118
119
120
121 if (nouveau_optimus_dsm(handle, 0, 0, &result))
122 return 0;
123
124
125
126
127
128 return result & 1 && result & (1 << NOUVEAU_DSM_OPTIMUS_CAPS);
129}
130
131static int nouveau_dsm(acpi_handle handle, int func, int arg)
132{
133 int ret = 0;
134 union acpi_object *obj;
135 union acpi_object argv4 = {
136 .integer.type = ACPI_TYPE_INTEGER,
137 .integer.value = arg,
138 };
139
140 obj = acpi_evaluate_dsm_typed(handle, nouveau_dsm_muid, 0x00000102,
141 func, &argv4, ACPI_TYPE_INTEGER);
142 if (!obj) {
143 acpi_handle_info(handle, "failed to evaluate _DSM\n");
144 return AE_ERROR;
145 } else {
146 if (obj->integer.value == 0x80000002)
147 ret = -ENODEV;
148 ACPI_FREE(obj);
149 }
150
151 return ret;
152}
153
154static int nouveau_dsm_switch_mux(acpi_handle handle, int mux_id)
155{
156 mxm_wmi_call_mxmx(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
157 mxm_wmi_call_mxds(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
158 return nouveau_dsm(handle, NOUVEAU_DSM_LED, mux_id);
159}
160
161static int nouveau_dsm_set_discrete_state(acpi_handle handle, enum vga_switcheroo_state state)
162{
163 int arg;
164 if (state == VGA_SWITCHEROO_ON)
165 arg = NOUVEAU_DSM_POWER_SPEED;
166 else
167 arg = NOUVEAU_DSM_POWER_STAMINA;
168 nouveau_dsm(handle, NOUVEAU_DSM_POWER, arg);
169 return 0;
170}
171
172static int nouveau_dsm_switchto(enum vga_switcheroo_client_id id)
173{
174 if (!nouveau_dsm_priv.dsm_detected)
175 return 0;
176 if (id == VGA_SWITCHEROO_IGD)
177 return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_STAMINA);
178 else
179 return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_SPEED);
180}
181
182static int nouveau_dsm_power_state(enum vga_switcheroo_client_id id,
183 enum vga_switcheroo_state state)
184{
185 if (id == VGA_SWITCHEROO_IGD)
186 return 0;
187
188
189
190 if (!nouveau_dsm_priv.dsm_detected)
191 return 0;
192
193 return nouveau_dsm_set_discrete_state(nouveau_dsm_priv.dhandle, state);
194}
195
196static int nouveau_dsm_get_client_id(struct pci_dev *pdev)
197{
198
199 if (pdev->vendor == PCI_VENDOR_ID_INTEL)
200 return VGA_SWITCHEROO_IGD;
201
202
203 if (pdev->bus->number == 0)
204 return VGA_SWITCHEROO_IGD;
205
206 return VGA_SWITCHEROO_DIS;
207}
208
209static const struct vga_switcheroo_handler nouveau_dsm_handler = {
210 .switchto = nouveau_dsm_switchto,
211 .power_state = nouveau_dsm_power_state,
212 .get_client_id = nouveau_dsm_get_client_id,
213};
214
215static int nouveau_dsm_pci_probe(struct pci_dev *pdev)
216{
217 acpi_handle dhandle;
218 int retval = 0;
219
220 dhandle = ACPI_HANDLE(&pdev->dev);
221 if (!dhandle)
222 return false;
223
224 if (!acpi_has_method(dhandle, "_DSM"))
225 return false;
226
227 if (acpi_check_dsm(dhandle, nouveau_dsm_muid, 0x00000102,
228 1 << NOUVEAU_DSM_POWER))
229 retval |= NOUVEAU_DSM_HAS_MUX;
230
231 if (nouveau_check_optimus_dsm(dhandle))
232 retval |= NOUVEAU_DSM_HAS_OPT;
233
234 if (retval & NOUVEAU_DSM_HAS_OPT) {
235 uint32_t result;
236 nouveau_optimus_dsm(dhandle, NOUVEAU_DSM_OPTIMUS_CAPS, 0,
237 &result);
238 dev_info(&pdev->dev, "optimus capabilities: %s, status %s%s\n",
239 (result & OPTIMUS_ENABLED) ? "enabled" : "disabled",
240 (result & OPTIMUS_DYNAMIC_PWR_CAP) ? "dynamic power, " : "",
241 (result & OPTIMUS_HDA_CODEC_MASK) ? "hda bios codec supported" : "");
242 }
243 if (retval)
244 nouveau_dsm_priv.dhandle = dhandle;
245
246 return retval;
247}
248
249static bool nouveau_dsm_detect(void)
250{
251 char acpi_method_name[255] = { 0 };
252 struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
253 struct pci_dev *pdev = NULL;
254 int has_dsm = 0;
255 int has_optimus = 0;
256 int vga_count = 0;
257 bool guid_valid;
258 int retval;
259 bool ret = false;
260
261
262 guid_valid = mxm_wmi_supported();
263
264 if (guid_valid)
265 printk("MXM: GUID detected in BIOS\n");
266
267
268 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
269 vga_count++;
270
271 retval = nouveau_dsm_pci_probe(pdev);
272 if (retval & NOUVEAU_DSM_HAS_MUX)
273 has_dsm |= 1;
274 if (retval & NOUVEAU_DSM_HAS_OPT)
275 has_optimus = 1;
276 }
277
278 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_3D << 8, pdev)) != NULL) {
279 vga_count++;
280
281 retval = nouveau_dsm_pci_probe(pdev);
282 if (retval & NOUVEAU_DSM_HAS_MUX)
283 has_dsm |= 1;
284 if (retval & NOUVEAU_DSM_HAS_OPT)
285 has_optimus = 1;
286 }
287
288
289 if (has_optimus == 1) {
290 acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
291 &buffer);
292 printk(KERN_INFO "VGA switcheroo: detected Optimus DSM method %s handle\n",
293 acpi_method_name);
294 nouveau_dsm_priv.optimus_detected = true;
295 ret = true;
296 } else if (vga_count == 2 && has_dsm && guid_valid) {
297 acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
298 &buffer);
299 printk(KERN_INFO "VGA switcheroo: detected DSM switching method %s handle\n",
300 acpi_method_name);
301 nouveau_dsm_priv.dsm_detected = true;
302 ret = true;
303 }
304
305
306 return ret;
307}
308
309void nouveau_register_dsm_handler(void)
310{
311 bool r;
312
313 r = nouveau_dsm_detect();
314 if (!r)
315 return;
316
317 vga_switcheroo_register_handler(&nouveau_dsm_handler, 0);
318}
319
320
321void nouveau_switcheroo_optimus_dsm(void)
322{
323 u32 result = 0;
324 if (!nouveau_dsm_priv.optimus_detected)
325 return;
326
327 nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_FLAGS,
328 0x3, &result);
329
330 nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_CAPS,
331 NOUVEAU_DSM_OPTIMUS_SET_POWERDOWN, &result);
332
333}
334
335void nouveau_unregister_dsm_handler(void)
336{
337 if (nouveau_dsm_priv.optimus_detected || nouveau_dsm_priv.dsm_detected)
338 vga_switcheroo_unregister_handler();
339}
340#else
341void nouveau_register_dsm_handler(void) {}
342void nouveau_unregister_dsm_handler(void) {}
343void nouveau_switcheroo_optimus_dsm(void) {}
344#endif
345
346
347static int nouveau_rom_call(acpi_handle rom_handle, uint8_t *bios,
348 int offset, int len)
349{
350 acpi_status status;
351 union acpi_object rom_arg_elements[2], *obj;
352 struct acpi_object_list rom_arg;
353 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL};
354
355 rom_arg.count = 2;
356 rom_arg.pointer = &rom_arg_elements[0];
357
358 rom_arg_elements[0].type = ACPI_TYPE_INTEGER;
359 rom_arg_elements[0].integer.value = offset;
360
361 rom_arg_elements[1].type = ACPI_TYPE_INTEGER;
362 rom_arg_elements[1].integer.value = len;
363
364 status = acpi_evaluate_object(rom_handle, NULL, &rom_arg, &buffer);
365 if (ACPI_FAILURE(status)) {
366 printk(KERN_INFO "failed to evaluate ROM got %s\n", acpi_format_exception(status));
367 return -ENODEV;
368 }
369 obj = (union acpi_object *)buffer.pointer;
370 len = min(len, (int)obj->buffer.length);
371 memcpy(bios+offset, obj->buffer.pointer, len);
372 kfree(buffer.pointer);
373 return len;
374}
375
376bool nouveau_acpi_rom_supported(struct device *dev)
377{
378 acpi_status status;
379 acpi_handle dhandle, rom_handle;
380
381 dhandle = ACPI_HANDLE(dev);
382 if (!dhandle)
383 return false;
384
385 status = acpi_get_handle(dhandle, "_ROM", &rom_handle);
386 if (ACPI_FAILURE(status))
387 return false;
388
389 nouveau_dsm_priv.rom_handle = rom_handle;
390 return true;
391}
392
393int nouveau_acpi_get_bios_chunk(uint8_t *bios, int offset, int len)
394{
395 return nouveau_rom_call(nouveau_dsm_priv.rom_handle, bios, offset, len);
396}
397
398void *
399nouveau_acpi_edid(struct drm_device *dev, struct drm_connector *connector)
400{
401 struct acpi_device *acpidev;
402 acpi_handle handle;
403 int type, ret;
404 void *edid;
405
406 switch (connector->connector_type) {
407 case DRM_MODE_CONNECTOR_LVDS:
408 case DRM_MODE_CONNECTOR_eDP:
409 type = ACPI_VIDEO_DISPLAY_LCD;
410 break;
411 default:
412 return NULL;
413 }
414
415 handle = ACPI_HANDLE(&dev->pdev->dev);
416 if (!handle)
417 return NULL;
418
419 ret = acpi_bus_get_device(handle, &acpidev);
420 if (ret)
421 return NULL;
422
423 ret = acpi_video_get_edid(acpidev, type, -1, &edid);
424 if (ret < 0)
425 return NULL;
426
427 return kmemdup(edid, EDID_LENGTH, GFP_KERNEL);
428}
429
