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, guid: &nouveau_op_dsm_muid, rev: 0x00000100,
88 func, argv4: &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, func: 0, arg: 0, result: &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, guid: &nouveau_dsm_muid, rev: 0x00000102,
140 func, argv4: &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(adapter: mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
156 mxm_wmi_call_mxds(adapter: mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
157 return nouveau_dsm(handle, NOUVEAU_DSM_LED, arg: 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(handle: nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_STAMINA);
177 else
178 return nouveau_dsm_switch_mux(handle: 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(handle: 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(dev: pdev);
228 if (parent_pdev) {
229 if (parent_pdev->bridge_d3)
230 *has_pr3 = pci_pr3_present(pdev: parent_pdev);
231 else
232 pci_d3cold_disable(dev: pdev);
233 }
234
235 dhandle = ACPI_HANDLE(&pdev->dev);
236 if (!dhandle)
237 return;
238
239 if (!acpi_has_method(handle: dhandle, name: "_DSM"))
240 return;
241
242 supports_mux = acpi_check_dsm(handle: dhandle, guid: &nouveau_dsm_muid, rev: 0x00000102,
243 funcs: 1 << NOUVEAU_DSM_POWER);
244 optimus_funcs = nouveau_dsm_get_optimus_functions(handle: 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(handle: dhandle, NOUVEAU_DSM_OPTIMUS_CAPS, arg: 0,
258 result: &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, from: 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_out: &dhandle, has_mux: &has_mux, has_opt: &has_optimus,
295 has_opt_flags: &has_optimus_flags, has_pr3: &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(object: nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
302 ret_path_ptr: &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(object: nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
314 ret_path_ptr: &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(handler: &nouveau_dsm_handler, handler_flags: 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(handle: nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_FLAGS,
345 arg: 0x3, result: &result);
346
347 nouveau_optimus_dsm(handle: nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_CAPS,
348 NOUVEAU_DSM_OPTIMUS_SET_POWERDOWN, result: &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(device: acpidev, type, device_id: -1, edid: &edid);
384 if (ret < 0)
385 return NULL;
386
387 return kmemdup(p: edid, EDID_LENGTH, GFP_KERNEL);
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}
399

source code of linux/drivers/gpu/drm/nouveau/nouveau_acpi.c