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
46 static 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
nouveau_is_optimus(void)54 bool nouveau_is_optimus(void) {
55 return nouveau_dsm_priv.optimus_detected;
56 }
57
nouveau_is_v1_dsm(void)58 bool nouveau_is_v1_dsm(void) {
59 return nouveau_dsm_priv.dsm_detected;
60 }
61
62 #ifdef CONFIG_VGA_SWITCHEROO
63 static const guid_t nouveau_dsm_muid =
64 GUID_INIT(0x9D95A0A0, 0x0060, 0x4D48,
65 0xB3, 0x4D, 0x7E, 0x5F, 0xEA, 0x12, 0x9F, 0xD4);
66
67 static const guid_t nouveau_op_dsm_muid =
68 GUID_INIT(0xA486D8F8, 0x0BDA, 0x471B,
69 0xA7, 0x2B, 0x60, 0x42, 0xA6, 0xB5, 0xBE, 0xE0);
70
nouveau_optimus_dsm(acpi_handle handle,int func,int arg,uint32_t * result)71 static 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 */
nouveau_dsm_get_optimus_functions(acpi_handle handle)110 static 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
nouveau_dsm(acpi_handle handle,int func,int arg)130 static 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
nouveau_dsm_switch_mux(acpi_handle handle,int mux_id)153 static 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
nouveau_dsm_set_discrete_state(acpi_handle handle,enum vga_switcheroo_state state)160 static 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
nouveau_dsm_switchto(enum vga_switcheroo_client_id id)171 static 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
nouveau_dsm_power_state(enum vga_switcheroo_client_id id,enum vga_switcheroo_state state)181 static 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
nouveau_dsm_get_client_id(struct pci_dev * pdev)195 static 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
208 static 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
nouveau_dsm_pci_probe(struct pci_dev * pdev,acpi_handle * dhandle_out,bool * has_mux,bool * has_opt,bool * has_opt_flags,bool * has_pr3)214 static 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
nouveau_dsm_detect(void)266 static 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_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
288 vga_count++;
289
290 nouveau_dsm_pci_probe(pdev, &dhandle, &has_mux, &has_optimus,
291 &has_optimus_flags, &has_power_resources);
292 }
293
294 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_3D << 8, pdev)) != NULL) {
295 vga_count++;
296
297 nouveau_dsm_pci_probe(pdev, &dhandle, &has_mux, &has_optimus,
298 &has_optimus_flags, &has_power_resources);
299 }
300
301 /* find the optimus DSM or the old v1 DSM */
302 if (has_optimus) {
303 nouveau_dsm_priv.dhandle = dhandle;
304 acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
305 &buffer);
306 pr_info("VGA switcheroo: detected Optimus DSM method %s handle\n",
307 acpi_method_name);
308 if (has_power_resources)
309 pr_info("nouveau: detected PR support, will not use DSM\n");
310 nouveau_dsm_priv.optimus_detected = true;
311 nouveau_dsm_priv.optimus_flags_detected = has_optimus_flags;
312 nouveau_dsm_priv.optimus_skip_dsm = has_power_resources;
313 ret = true;
314 } else if (vga_count == 2 && has_mux && guid_valid) {
315 nouveau_dsm_priv.dhandle = dhandle;
316 acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
317 &buffer);
318 pr_info("VGA switcheroo: detected DSM switching method %s handle\n",
319 acpi_method_name);
320 nouveau_dsm_priv.dsm_detected = true;
321 ret = true;
322 }
323
324
325 return ret;
326 }
327
nouveau_register_dsm_handler(void)328 void nouveau_register_dsm_handler(void)
329 {
330 bool r;
331
332 r = nouveau_dsm_detect();
333 if (!r)
334 return;
335
336 vga_switcheroo_register_handler(&nouveau_dsm_handler, 0);
337 }
338
339 /* Must be called for Optimus models before the card can be turned off */
nouveau_switcheroo_optimus_dsm(void)340 void nouveau_switcheroo_optimus_dsm(void)
341 {
342 u32 result = 0;
343 if (!nouveau_dsm_priv.optimus_detected || nouveau_dsm_priv.optimus_skip_dsm)
344 return;
345
346 if (nouveau_dsm_priv.optimus_flags_detected)
347 nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_FLAGS,
348 0x3, &result);
349
350 nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_CAPS,
351 NOUVEAU_DSM_OPTIMUS_SET_POWERDOWN, &result);
352
353 }
354
nouveau_unregister_dsm_handler(void)355 void nouveau_unregister_dsm_handler(void)
356 {
357 if (nouveau_dsm_priv.optimus_detected || nouveau_dsm_priv.dsm_detected)
358 vga_switcheroo_unregister_handler();
359 }
360 #else
nouveau_register_dsm_handler(void)361 void nouveau_register_dsm_handler(void) {}
nouveau_unregister_dsm_handler(void)362 void nouveau_unregister_dsm_handler(void) {}
nouveau_switcheroo_optimus_dsm(void)363 void nouveau_switcheroo_optimus_dsm(void) {}
364 #endif
365
366 void *
nouveau_acpi_edid(struct drm_device * dev,struct drm_connector * connector)367 nouveau_acpi_edid(struct drm_device *dev, struct drm_connector *connector)
368 {
369 struct acpi_device *acpidev;
370 int type, ret;
371 void *edid;
372
373 switch (connector->connector_type) {
374 case DRM_MODE_CONNECTOR_LVDS:
375 case DRM_MODE_CONNECTOR_eDP:
376 type = ACPI_VIDEO_DISPLAY_LCD;
377 break;
378 default:
379 return NULL;
380 }
381
382 acpidev = ACPI_COMPANION(dev->dev);
383 if (!acpidev)
384 return NULL;
385
386 ret = acpi_video_get_edid(acpidev, type, -1, &edid);
387 if (ret < 0)
388 return NULL;
389
390 return kmemdup(edid, EDID_LENGTH, GFP_KERNEL);
391 }
392
nouveau_acpi_video_backlight_use_native(void)393 bool nouveau_acpi_video_backlight_use_native(void)
394 {
395 return acpi_video_backlight_use_native();
396 }
397
nouveau_acpi_video_register_backlight(void)398 void nouveau_acpi_video_register_backlight(void)
399 {
400 acpi_video_register_backlight();
401 }
402