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1// SPDX-License-Identifier: MIT
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/* result of the optimus caps function */
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) /* hda bios control */
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 /* ACPI is little endian, AABBCCDD becomes {DD,CC,BB,AA} */
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 * On some platforms, _DSM(nouveau_op_dsm_muid, func0) has special
107 * requirements on the fourth parameter, so a private implementation
108 * instead of using acpi_check_dsm().
109 */
110static int nouveau_dsm_get_optimus_functions(acpi_handle handle)
111{
112 int result;
113
114 /*
115 * Function 0 returns a Buffer containing available functions.
116 * The args parameter is ignored for function 0, so just put 0 in it
117 */
118 if (nouveau_optimus_dsm(handle, 0, 0, &result))
119 return 0;
120
121 /*
122 * ACPI Spec v4 9.14.1: if bit 0 is zero, no function is supported.
123 * If the n-th bit is enabled, function n is supported
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 /* Optimus laptops have the card already disabled in
188 * nouveau_switcheroo_set_state */
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 /* easy option one - intel vendor ID means Integrated */
198 if (pdev->vendor == PCI_VENDOR_ID_INTEL)
199 return VGA_SWITCHEROO_IGD;
200
201 /* is this device on Bus 0? - this may need improving */
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 if (pdev->vendor != PCI_VENDOR_ID_NVIDIA)
224 return;
225
226 *has_pr3 = false;
227 parent_pdev = pci_upstream_bridge(pdev);
228 if (parent_pdev) {
229 if (parent_pdev->bridge_d3)
230 *has_pr3 = pci_pr3_present(parent_pdev);
231 else
232 pci_d3cold_disable(pdev);
233 }
234
235 dhandle = ACPI_HANDLE(&pdev->dev);
236 if (!dhandle)
237 return;
238
239 if (!acpi_has_method(dhandle, "_DSM"))
240 return;
241
242 supports_mux = acpi_check_dsm(dhandle, &nouveau_dsm_muid, 0x00000102,
243 1 << NOUVEAU_DSM_POWER);
244 optimus_funcs = nouveau_dsm_get_optimus_functions(dhandle);
245
246 /* Does not look like a Nvidia device. */
247 if (!supports_mux && !optimus_funcs)
248 return;
249
250 *dhandle_out = dhandle;
251 *has_mux = supports_mux;
252 *has_opt = !!optimus_funcs;
253 *has_opt_flags = optimus_funcs & (1 << NOUVEAU_DSM_OPTIMUS_FLAGS);
254
255 if (optimus_funcs) {
256 uint32_t result;
257 nouveau_optimus_dsm(dhandle, NOUVEAU_DSM_OPTIMUS_CAPS, 0,
258 &result);
259 dev_info(&pdev->dev, "optimus capabilities: %s, status %s%s\n",
260 (result & OPTIMUS_ENABLED) ? "enabled" : "disabled",
261 (result & OPTIMUS_DYNAMIC_PWR_CAP) ? "dynamic power, " : "",
262 (result & OPTIMUS_HDA_CODEC_MASK) ? "hda bios codec supported" : "");
263 }
264}
265
266static bool nouveau_dsm_detect(void)
267{
268 char acpi_method_name[255] = { 0 };
269 struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
270 struct pci_dev *pdev = NULL;
271 acpi_handle dhandle = NULL;
272 bool has_mux = false;
273 bool has_optimus = false;
274 bool has_optimus_flags = false;
275 bool has_power_resources = false;
276 int vga_count = 0;
277 bool guid_valid;
278 bool ret = false;
279
280 /* lookup the MXM GUID */
281 guid_valid = mxm_wmi_supported();
282
283 if (guid_valid)
284 printk("MXM: GUID detected in BIOS\n");
285
286 /* now do DSM detection */
287 while ((pdev = pci_get_base_class(PCI_BASE_CLASS_DISPLAY, pdev))) {
288 if ((pdev->class != PCI_CLASS_DISPLAY_VGA << 8) &&
289 (pdev->class != PCI_CLASS_DISPLAY_3D << 8))
290 continue;
291
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 /* find the optimus DSM or the old v1 DSM */
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/* Must be called for Optimus models before the card can be turned off */
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 int type, ret;
368 void *edid;
369
370 switch (connector->connector_type) {
371 case DRM_MODE_CONNECTOR_LVDS:
372 case DRM_MODE_CONNECTOR_eDP:
373 type = ACPI_VIDEO_DISPLAY_LCD;
374 break;
375 default:
376 return NULL;
377 }
378
379 acpidev = ACPI_COMPANION(dev->dev);
380 if (!acpidev)
381 return NULL;
382
383 ret = acpi_video_get_edid(acpidev, type, -1, &edid);
384 if (ret < 0)
385 return NULL;
386
387 return edid;
388}
389
390bool nouveau_acpi_video_backlight_use_native(void)
391{
392 return acpi_video_backlight_use_native();
393}
394
395void nouveau_acpi_video_register_backlight(void)
396{
397 acpi_video_register_backlight();
398}
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_drv.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/* result of the optimus caps function */
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) /* hda bios control */
44
45static struct nouveau_dsm_priv {
46 bool dsm_detected;
47 bool optimus_detected;
48 bool optimus_flags_detected;
49 bool optimus_skip_dsm;
50 acpi_handle dhandle;
51 acpi_handle rom_handle;
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 char nouveau_dsm_muid[] = {
64 0xA0, 0xA0, 0x95, 0x9D, 0x60, 0x00, 0x48, 0x4D,
65 0xB3, 0x4D, 0x7E, 0x5F, 0xEA, 0x12, 0x9F, 0xD4,
66};
67
68static const char nouveau_op_dsm_muid[] = {
69 0xF8, 0xD8, 0x86, 0xA4, 0xDA, 0x0B, 0x1B, 0x47,
70 0xA7, 0x2B, 0x60, 0x42, 0xA6, 0xB5, 0xBE, 0xE0,
71};
72
73static int nouveau_optimus_dsm(acpi_handle handle, int func, int arg, uint32_t *result)
74{
75 int i;
76 union acpi_object *obj;
77 char args_buff[4];
78 union acpi_object argv4 = {
79 .buffer.type = ACPI_TYPE_BUFFER,
80 .buffer.length = 4,
81 .buffer.pointer = args_buff
82 };
83
84 /* ACPI is little endian, AABBCCDD becomes {DD,CC,BB,AA} */
85 for (i = 0; i < 4; i++)
86 args_buff[i] = (arg >> i * 8) & 0xFF;
87
88 *result = 0;
89 obj = acpi_evaluate_dsm_typed(handle, nouveau_op_dsm_muid, 0x00000100,
90 func, &argv4, ACPI_TYPE_BUFFER);
91 if (!obj) {
92 acpi_handle_info(handle, "failed to evaluate _DSM\n");
93 return AE_ERROR;
94 } else {
95 if (obj->buffer.length == 4) {
96 *result |= obj->buffer.pointer[0];
97 *result |= (obj->buffer.pointer[1] << 8);
98 *result |= (obj->buffer.pointer[2] << 16);
99 *result |= (obj->buffer.pointer[3] << 24);
100 }
101 ACPI_FREE(obj);
102 }
103
104 return 0;
105}
106
107/*
108 * On some platforms, _DSM(nouveau_op_dsm_muid, func0) has special
109 * requirements on the fourth parameter, so a private implementation
110 * instead of using acpi_check_dsm().
111 */
112static int nouveau_dsm_get_optimus_functions(acpi_handle handle)
113{
114 int result;
115
116 /*
117 * Function 0 returns a Buffer containing available functions.
118 * The args parameter is ignored for function 0, so just put 0 in it
119 */
120 if (nouveau_optimus_dsm(handle, 0, 0, &result))
121 return 0;
122
123 /*
124 * ACPI Spec v4 9.14.1: if bit 0 is zero, no function is supported.
125 * If the n-th bit is enabled, function n is supported
126 */
127 if (result & 1 && result & (1 << NOUVEAU_DSM_OPTIMUS_CAPS))
128 return result;
129 return 0;
130}
131
132static int nouveau_dsm(acpi_handle handle, int func, int arg)
133{
134 int ret = 0;
135 union acpi_object *obj;
136 union acpi_object argv4 = {
137 .integer.type = ACPI_TYPE_INTEGER,
138 .integer.value = arg,
139 };
140
141 obj = acpi_evaluate_dsm_typed(handle, nouveau_dsm_muid, 0x00000102,
142 func, &argv4, ACPI_TYPE_INTEGER);
143 if (!obj) {
144 acpi_handle_info(handle, "failed to evaluate _DSM\n");
145 return AE_ERROR;
146 } else {
147 if (obj->integer.value == 0x80000002)
148 ret = -ENODEV;
149 ACPI_FREE(obj);
150 }
151
152 return ret;
153}
154
155static int nouveau_dsm_switch_mux(acpi_handle handle, int mux_id)
156{
157 mxm_wmi_call_mxmx(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
158 mxm_wmi_call_mxds(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
159 return nouveau_dsm(handle, NOUVEAU_DSM_LED, mux_id);
160}
161
162static int nouveau_dsm_set_discrete_state(acpi_handle handle, enum vga_switcheroo_state state)
163{
164 int arg;
165 if (state == VGA_SWITCHEROO_ON)
166 arg = NOUVEAU_DSM_POWER_SPEED;
167 else
168 arg = NOUVEAU_DSM_POWER_STAMINA;
169 nouveau_dsm(handle, NOUVEAU_DSM_POWER, arg);
170 return 0;
171}
172
173static int nouveau_dsm_switchto(enum vga_switcheroo_client_id id)
174{
175 if (!nouveau_dsm_priv.dsm_detected)
176 return 0;
177 if (id == VGA_SWITCHEROO_IGD)
178 return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_STAMINA);
179 else
180 return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_SPEED);
181}
182
183static int nouveau_dsm_power_state(enum vga_switcheroo_client_id id,
184 enum vga_switcheroo_state state)
185{
186 if (id == VGA_SWITCHEROO_IGD)
187 return 0;
188
189 /* Optimus laptops have the card already disabled in
190 * nouveau_switcheroo_set_state */
191 if (!nouveau_dsm_priv.dsm_detected)
192 return 0;
193
194 return nouveau_dsm_set_discrete_state(nouveau_dsm_priv.dhandle, state);
195}
196
197static int nouveau_dsm_get_client_id(struct pci_dev *pdev)
198{
199 /* easy option one - intel vendor ID means Integrated */
200 if (pdev->vendor == PCI_VENDOR_ID_INTEL)
201 return VGA_SWITCHEROO_IGD;
202
203 /* is this device on Bus 0? - this may need improving */
204 if (pdev->bus->number == 0)
205 return VGA_SWITCHEROO_IGD;
206
207 return VGA_SWITCHEROO_DIS;
208}
209
210static const struct vga_switcheroo_handler nouveau_dsm_handler = {
211 .switchto = nouveau_dsm_switchto,
212 .power_state = nouveau_dsm_power_state,
213 .get_client_id = nouveau_dsm_get_client_id,
214};
215
216/*
217 * Firmware supporting Windows 8 or later do not use _DSM to put the device into
218 * D3cold, they instead rely on disabling power resources on the parent.
219 */
220static bool nouveau_pr3_present(struct pci_dev *pdev)
221{
222 struct pci_dev *parent_pdev = pci_upstream_bridge(pdev);
223 struct acpi_device *parent_adev;
224
225 if (!parent_pdev)
226 return false;
227
228 if (!parent_pdev->bridge_d3) {
229 /*
230 * Parent PCI bridge is currently not power managed.
231 * Since userspace can change these afterwards to be on
232 * the safe side we stick with _DSM and prevent usage of
233 * _PR3 from the bridge.
234 */
235 pci_d3cold_disable(pdev);
236 return false;
237 }
238
239 parent_adev = ACPI_COMPANION(&parent_pdev->dev);
240 if (!parent_adev)
241 return false;
242
243 return parent_adev->power.flags.power_resources &&
244 acpi_has_method(parent_adev->handle, "_PR3");
245}
246
247static void nouveau_dsm_pci_probe(struct pci_dev *pdev, acpi_handle *dhandle_out,
248 bool *has_mux, bool *has_opt,
249 bool *has_opt_flags, bool *has_pr3)
250{
251 acpi_handle dhandle;
252 bool supports_mux;
253 int optimus_funcs;
254
255 dhandle = ACPI_HANDLE(&pdev->dev);
256 if (!dhandle)
257 return;
258
259 if (!acpi_has_method(dhandle, "_DSM"))
260 return;
261
262 supports_mux = acpi_check_dsm(dhandle, nouveau_dsm_muid, 0x00000102,
263 1 << NOUVEAU_DSM_POWER);
264 optimus_funcs = nouveau_dsm_get_optimus_functions(dhandle);
265
266 /* Does not look like a Nvidia device. */
267 if (!supports_mux && !optimus_funcs)
268 return;
269
270 *dhandle_out = dhandle;
271 *has_mux = supports_mux;
272 *has_opt = !!optimus_funcs;
273 *has_opt_flags = optimus_funcs & (1 << NOUVEAU_DSM_OPTIMUS_FLAGS);
274 *has_pr3 = false;
275
276 if (optimus_funcs) {
277 uint32_t result;
278 nouveau_optimus_dsm(dhandle, NOUVEAU_DSM_OPTIMUS_CAPS, 0,
279 &result);
280 dev_info(&pdev->dev, "optimus capabilities: %s, status %s%s\n",
281 (result & OPTIMUS_ENABLED) ? "enabled" : "disabled",
282 (result & OPTIMUS_DYNAMIC_PWR_CAP) ? "dynamic power, " : "",
283 (result & OPTIMUS_HDA_CODEC_MASK) ? "hda bios codec supported" : "");
284
285 *has_pr3 = nouveau_pr3_present(pdev);
286 }
287}
288
289static bool nouveau_dsm_detect(void)
290{
291 char acpi_method_name[255] = { 0 };
292 struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
293 struct pci_dev *pdev = NULL;
294 acpi_handle dhandle = NULL;
295 bool has_mux = false;
296 bool has_optimus = false;
297 bool has_optimus_flags = false;
298 bool has_power_resources = false;
299 int vga_count = 0;
300 bool guid_valid;
301 bool ret = false;
302
303 /* lookup the MXM GUID */
304 guid_valid = mxm_wmi_supported();
305
306 if (guid_valid)
307 printk("MXM: GUID detected in BIOS\n");
308
309 /* now do DSM detection */
310 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
311 vga_count++;
312
313 nouveau_dsm_pci_probe(pdev, &dhandle, &has_mux, &has_optimus,
314 &has_optimus_flags, &has_power_resources);
315 }
316
317 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_3D << 8, pdev)) != NULL) {
318 vga_count++;
319
320 nouveau_dsm_pci_probe(pdev, &dhandle, &has_mux, &has_optimus,
321 &has_optimus_flags, &has_power_resources);
322 }
323
324 /* find the optimus DSM or the old v1 DSM */
325 if (has_optimus) {
326 nouveau_dsm_priv.dhandle = dhandle;
327 acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
328 &buffer);
329 printk(KERN_INFO "VGA switcheroo: detected Optimus DSM method %s handle\n",
330 acpi_method_name);
331 if (has_power_resources)
332 pr_info("nouveau: detected PR support, will not use DSM\n");
333 nouveau_dsm_priv.optimus_detected = true;
334 nouveau_dsm_priv.optimus_flags_detected = has_optimus_flags;
335 nouveau_dsm_priv.optimus_skip_dsm = has_power_resources;
336 ret = true;
337 } else if (vga_count == 2 && has_mux && guid_valid) {
338 nouveau_dsm_priv.dhandle = dhandle;
339 acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
340 &buffer);
341 printk(KERN_INFO "VGA switcheroo: detected DSM switching method %s handle\n",
342 acpi_method_name);
343 nouveau_dsm_priv.dsm_detected = true;
344 ret = true;
345 }
346
347
348 return ret;
349}
350
351void nouveau_register_dsm_handler(void)
352{
353 bool r;
354
355 r = nouveau_dsm_detect();
356 if (!r)
357 return;
358
359 vga_switcheroo_register_handler(&nouveau_dsm_handler, 0);
360}
361
362/* Must be called for Optimus models before the card can be turned off */
363void nouveau_switcheroo_optimus_dsm(void)
364{
365 u32 result = 0;
366 if (!nouveau_dsm_priv.optimus_detected || nouveau_dsm_priv.optimus_skip_dsm)
367 return;
368
369 if (nouveau_dsm_priv.optimus_flags_detected)
370 nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_FLAGS,
371 0x3, &result);
372
373 nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_CAPS,
374 NOUVEAU_DSM_OPTIMUS_SET_POWERDOWN, &result);
375
376}
377
378void nouveau_unregister_dsm_handler(void)
379{
380 if (nouveau_dsm_priv.optimus_detected || nouveau_dsm_priv.dsm_detected)
381 vga_switcheroo_unregister_handler();
382}
383#else
384void nouveau_register_dsm_handler(void) {}
385void nouveau_unregister_dsm_handler(void) {}
386void nouveau_switcheroo_optimus_dsm(void) {}
387#endif
388
389/* retrieve the ROM in 4k blocks */
390static int nouveau_rom_call(acpi_handle rom_handle, uint8_t *bios,
391 int offset, int len)
392{
393 acpi_status status;
394 union acpi_object rom_arg_elements[2], *obj;
395 struct acpi_object_list rom_arg;
396 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL};
397
398 rom_arg.count = 2;
399 rom_arg.pointer = &rom_arg_elements[0];
400
401 rom_arg_elements[0].type = ACPI_TYPE_INTEGER;
402 rom_arg_elements[0].integer.value = offset;
403
404 rom_arg_elements[1].type = ACPI_TYPE_INTEGER;
405 rom_arg_elements[1].integer.value = len;
406
407 status = acpi_evaluate_object(rom_handle, NULL, &rom_arg, &buffer);
408 if (ACPI_FAILURE(status)) {
409 printk(KERN_INFO "failed to evaluate ROM got %s\n", acpi_format_exception(status));
410 return -ENODEV;
411 }
412 obj = (union acpi_object *)buffer.pointer;
413 len = min(len, (int)obj->buffer.length);
414 memcpy(bios+offset, obj->buffer.pointer, len);
415 kfree(buffer.pointer);
416 return len;
417}
418
419bool nouveau_acpi_rom_supported(struct device *dev)
420{
421 acpi_status status;
422 acpi_handle dhandle, rom_handle;
423
424 dhandle = ACPI_HANDLE(dev);
425 if (!dhandle)
426 return false;
427
428 status = acpi_get_handle(dhandle, "_ROM", &rom_handle);
429 if (ACPI_FAILURE(status))
430 return false;
431
432 nouveau_dsm_priv.rom_handle = rom_handle;
433 return true;
434}
435
436int nouveau_acpi_get_bios_chunk(uint8_t *bios, int offset, int len)
437{
438 return nouveau_rom_call(nouveau_dsm_priv.rom_handle, bios, offset, len);
439}
440
441void *
442nouveau_acpi_edid(struct drm_device *dev, struct drm_connector *connector)
443{
444 struct acpi_device *acpidev;
445 acpi_handle handle;
446 int type, ret;
447 void *edid;
448
449 switch (connector->connector_type) {
450 case DRM_MODE_CONNECTOR_LVDS:
451 case DRM_MODE_CONNECTOR_eDP:
452 type = ACPI_VIDEO_DISPLAY_LCD;
453 break;
454 default:
455 return NULL;
456 }
457
458 handle = ACPI_HANDLE(&dev->pdev->dev);
459 if (!handle)
460 return NULL;
461
462 ret = acpi_bus_get_device(handle, &acpidev);
463 if (ret)
464 return NULL;
465
466 ret = acpi_video_get_edid(acpidev, type, -1, &edid);
467 if (ret < 0)
468 return NULL;
469
470 return kmemdup(edid, EDID_LENGTH, GFP_KERNEL);
471}