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1 | /* |
2 | * Copyright (c) 2010 Red Hat Inc. | |
3 | * Author : Dave Airlie <airlied@redhat.com> | |
4 | * | |
5 | * Licensed under GPLv2 | |
6 | * | |
7 | * ATPX support for both Intel/ATI | |
8 | */ | |
9 | #include <linux/vga_switcheroo.h> | |
10 | #include <linux/slab.h> | |
11 | #include <linux/acpi.h> | |
12 | #include <linux/pci.h> | |
13 | ||
14 | #include "amdgpu_acpi.h" | |
15 | ||
16 | struct amdgpu_atpx_functions { | |
17 | bool px_params; | |
18 | bool power_cntl; | |
19 | bool disp_mux_cntl; | |
20 | bool i2c_mux_cntl; | |
21 | bool switch_start; | |
22 | bool switch_end; | |
23 | bool disp_connectors_mapping; | |
24 | bool disp_detetion_ports; | |
25 | }; | |
26 | ||
27 | struct amdgpu_atpx { | |
28 | acpi_handle handle; | |
29 | struct amdgpu_atpx_functions functions; | |
30 | }; | |
31 | ||
32 | static struct amdgpu_atpx_priv { | |
33 | bool atpx_detected; | |
34 | /* handle for device - and atpx */ | |
35 | acpi_handle dhandle; | |
36 | acpi_handle other_handle; | |
37 | struct amdgpu_atpx atpx; | |
38 | } amdgpu_atpx_priv; | |
39 | ||
40 | struct atpx_verify_interface { | |
41 | u16 size; /* structure size in bytes (includes size field) */ | |
42 | u16 version; /* version */ | |
43 | u32 function_bits; /* supported functions bit vector */ | |
44 | } __packed; | |
45 | ||
46 | struct atpx_px_params { | |
47 | u16 size; /* structure size in bytes (includes size field) */ | |
48 | u32 valid_flags; /* which flags are valid */ | |
49 | u32 flags; /* flags */ | |
50 | } __packed; | |
51 | ||
52 | struct atpx_power_control { | |
53 | u16 size; | |
54 | u8 dgpu_state; | |
55 | } __packed; | |
56 | ||
57 | struct atpx_mux { | |
58 | u16 size; | |
59 | u16 mux; | |
60 | } __packed; | |
61 | ||
62 | bool amdgpu_has_atpx(void) { | |
63 | return amdgpu_atpx_priv.atpx_detected; | |
64 | } | |
65 | ||
66 | /** | |
67 | * amdgpu_atpx_call - call an ATPX method | |
68 | * | |
69 | * @handle: acpi handle | |
70 | * @function: the ATPX function to execute | |
71 | * @params: ATPX function params | |
72 | * | |
73 | * Executes the requested ATPX function (all asics). | |
74 | * Returns a pointer to the acpi output buffer. | |
75 | */ | |
76 | static union acpi_object *amdgpu_atpx_call(acpi_handle handle, int function, | |
77 | struct acpi_buffer *params) | |
78 | { | |
79 | acpi_status status; | |
80 | union acpi_object atpx_arg_elements[2]; | |
81 | struct acpi_object_list atpx_arg; | |
82 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
83 | ||
84 | atpx_arg.count = 2; | |
85 | atpx_arg.pointer = &atpx_arg_elements[0]; | |
86 | ||
87 | atpx_arg_elements[0].type = ACPI_TYPE_INTEGER; | |
88 | atpx_arg_elements[0].integer.value = function; | |
89 | ||
90 | if (params) { | |
91 | atpx_arg_elements[1].type = ACPI_TYPE_BUFFER; | |
92 | atpx_arg_elements[1].buffer.length = params->length; | |
93 | atpx_arg_elements[1].buffer.pointer = params->pointer; | |
94 | } else { | |
95 | /* We need a second fake parameter */ | |
96 | atpx_arg_elements[1].type = ACPI_TYPE_INTEGER; | |
97 | atpx_arg_elements[1].integer.value = 0; | |
98 | } | |
99 | ||
100 | status = acpi_evaluate_object(handle, NULL, &atpx_arg, &buffer); | |
101 | ||
102 | /* Fail only if calling the method fails and ATPX is supported */ | |
103 | if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { | |
104 | printk("failed to evaluate ATPX got %s\n", | |
105 | acpi_format_exception(status)); | |
106 | kfree(buffer.pointer); | |
107 | return NULL; | |
108 | } | |
109 | ||
110 | return buffer.pointer; | |
111 | } | |
112 | ||
113 | /** | |
114 | * amdgpu_atpx_parse_functions - parse supported functions | |
115 | * | |
116 | * @f: supported functions struct | |
117 | * @mask: supported functions mask from ATPX | |
118 | * | |
119 | * Use the supported functions mask from ATPX function | |
120 | * ATPX_FUNCTION_VERIFY_INTERFACE to determine what functions | |
121 | * are supported (all asics). | |
122 | */ | |
123 | static void amdgpu_atpx_parse_functions(struct amdgpu_atpx_functions *f, u32 mask) | |
124 | { | |
125 | f->px_params = mask & ATPX_GET_PX_PARAMETERS_SUPPORTED; | |
126 | f->power_cntl = mask & ATPX_POWER_CONTROL_SUPPORTED; | |
127 | f->disp_mux_cntl = mask & ATPX_DISPLAY_MUX_CONTROL_SUPPORTED; | |
128 | f->i2c_mux_cntl = mask & ATPX_I2C_MUX_CONTROL_SUPPORTED; | |
129 | f->switch_start = mask & ATPX_GRAPHICS_DEVICE_SWITCH_START_NOTIFICATION_SUPPORTED; | |
130 | f->switch_end = mask & ATPX_GRAPHICS_DEVICE_SWITCH_END_NOTIFICATION_SUPPORTED; | |
131 | f->disp_connectors_mapping = mask & ATPX_GET_DISPLAY_CONNECTORS_MAPPING_SUPPORTED; | |
132 | f->disp_detetion_ports = mask & ATPX_GET_DISPLAY_DETECTION_PORTS_SUPPORTED; | |
133 | } | |
134 | ||
135 | /** | |
136 | * amdgpu_atpx_validate_functions - validate ATPX functions | |
137 | * | |
138 | * @atpx: amdgpu atpx struct | |
139 | * | |
140 | * Validate that required functions are enabled (all asics). | |
141 | * returns 0 on success, error on failure. | |
142 | */ | |
143 | static int amdgpu_atpx_validate(struct amdgpu_atpx *atpx) | |
144 | { | |
145 | /* make sure required functions are enabled */ | |
146 | /* dGPU power control is required */ | |
147 | atpx->functions.power_cntl = true; | |
148 | ||
149 | if (atpx->functions.px_params) { | |
150 | union acpi_object *info; | |
151 | struct atpx_px_params output; | |
152 | size_t size; | |
153 | u32 valid_bits; | |
154 | ||
155 | info = amdgpu_atpx_call(atpx->handle, ATPX_FUNCTION_GET_PX_PARAMETERS, NULL); | |
156 | if (!info) | |
157 | return -EIO; | |
158 | ||
159 | memset(&output, 0, sizeof(output)); | |
160 | ||
161 | size = *(u16 *) info->buffer.pointer; | |
162 | if (size < 10) { | |
163 | printk("ATPX buffer is too small: %zu\n", size); | |
164 | kfree(info); | |
165 | return -EINVAL; | |
166 | } | |
167 | size = min(sizeof(output), size); | |
168 | ||
169 | memcpy(&output, info->buffer.pointer, size); | |
170 | ||
171 | valid_bits = output.flags & output.valid_flags; | |
172 | /* if separate mux flag is set, mux controls are required */ | |
173 | if (valid_bits & ATPX_SEPARATE_MUX_FOR_I2C) { | |
174 | atpx->functions.i2c_mux_cntl = true; | |
175 | atpx->functions.disp_mux_cntl = true; | |
176 | } | |
177 | /* if any outputs are muxed, mux controls are required */ | |
178 | if (valid_bits & (ATPX_CRT1_RGB_SIGNAL_MUXED | | |
179 | ATPX_TV_SIGNAL_MUXED | | |
180 | ATPX_DFP_SIGNAL_MUXED)) | |
181 | atpx->functions.disp_mux_cntl = true; | |
182 | ||
183 | kfree(info); | |
184 | } | |
185 | return 0; | |
186 | } | |
187 | ||
188 | /** | |
189 | * amdgpu_atpx_verify_interface - verify ATPX | |
190 | * | |
191 | * @atpx: amdgpu atpx struct | |
192 | * | |
193 | * Execute the ATPX_FUNCTION_VERIFY_INTERFACE ATPX function | |
194 | * to initialize ATPX and determine what features are supported | |
195 | * (all asics). | |
196 | * returns 0 on success, error on failure. | |
197 | */ | |
198 | static int amdgpu_atpx_verify_interface(struct amdgpu_atpx *atpx) | |
199 | { | |
200 | union acpi_object *info; | |
201 | struct atpx_verify_interface output; | |
202 | size_t size; | |
203 | int err = 0; | |
204 | ||
205 | info = amdgpu_atpx_call(atpx->handle, ATPX_FUNCTION_VERIFY_INTERFACE, NULL); | |
206 | if (!info) | |
207 | return -EIO; | |
208 | ||
209 | memset(&output, 0, sizeof(output)); | |
210 | ||
211 | size = *(u16 *) info->buffer.pointer; | |
212 | if (size < 8) { | |
213 | printk("ATPX buffer is too small: %zu\n", size); | |
214 | err = -EINVAL; | |
215 | goto out; | |
216 | } | |
217 | size = min(sizeof(output), size); | |
218 | ||
219 | memcpy(&output, info->buffer.pointer, size); | |
220 | ||
221 | /* TODO: check version? */ | |
222 | printk("ATPX version %u, functions 0x%08x\n", | |
223 | output.version, output.function_bits); | |
224 | ||
225 | amdgpu_atpx_parse_functions(&atpx->functions, output.function_bits); | |
226 | ||
227 | out: | |
228 | kfree(info); | |
229 | return err; | |
230 | } | |
231 | ||
232 | /** | |
233 | * amdgpu_atpx_set_discrete_state - power up/down discrete GPU | |
234 | * | |
235 | * @atpx: atpx info struct | |
236 | * @state: discrete GPU state (0 = power down, 1 = power up) | |
237 | * | |
238 | * Execute the ATPX_FUNCTION_POWER_CONTROL ATPX function to | |
239 | * power down/up the discrete GPU (all asics). | |
240 | * Returns 0 on success, error on failure. | |
241 | */ | |
242 | static int amdgpu_atpx_set_discrete_state(struct amdgpu_atpx *atpx, u8 state) | |
243 | { | |
244 | struct acpi_buffer params; | |
245 | union acpi_object *info; | |
246 | struct atpx_power_control input; | |
247 | ||
248 | if (atpx->functions.power_cntl) { | |
249 | input.size = 3; | |
250 | input.dgpu_state = state; | |
251 | params.length = input.size; | |
252 | params.pointer = &input; | |
253 | info = amdgpu_atpx_call(atpx->handle, | |
254 | ATPX_FUNCTION_POWER_CONTROL, | |
255 | ¶ms); | |
256 | if (!info) | |
257 | return -EIO; | |
258 | kfree(info); | |
259 | } | |
260 | return 0; | |
261 | } | |
262 | ||
263 | /** | |
264 | * amdgpu_atpx_switch_disp_mux - switch display mux | |
265 | * | |
266 | * @atpx: atpx info struct | |
267 | * @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU) | |
268 | * | |
269 | * Execute the ATPX_FUNCTION_DISPLAY_MUX_CONTROL ATPX function to | |
270 | * switch the display mux between the discrete GPU and integrated GPU | |
271 | * (all asics). | |
272 | * Returns 0 on success, error on failure. | |
273 | */ | |
274 | static int amdgpu_atpx_switch_disp_mux(struct amdgpu_atpx *atpx, u16 mux_id) | |
275 | { | |
276 | struct acpi_buffer params; | |
277 | union acpi_object *info; | |
278 | struct atpx_mux input; | |
279 | ||
280 | if (atpx->functions.disp_mux_cntl) { | |
281 | input.size = 4; | |
282 | input.mux = mux_id; | |
283 | params.length = input.size; | |
284 | params.pointer = &input; | |
285 | info = amdgpu_atpx_call(atpx->handle, | |
286 | ATPX_FUNCTION_DISPLAY_MUX_CONTROL, | |
287 | ¶ms); | |
288 | if (!info) | |
289 | return -EIO; | |
290 | kfree(info); | |
291 | } | |
292 | return 0; | |
293 | } | |
294 | ||
295 | /** | |
296 | * amdgpu_atpx_switch_i2c_mux - switch i2c/hpd mux | |
297 | * | |
298 | * @atpx: atpx info struct | |
299 | * @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU) | |
300 | * | |
301 | * Execute the ATPX_FUNCTION_I2C_MUX_CONTROL ATPX function to | |
302 | * switch the i2c/hpd mux between the discrete GPU and integrated GPU | |
303 | * (all asics). | |
304 | * Returns 0 on success, error on failure. | |
305 | */ | |
306 | static int amdgpu_atpx_switch_i2c_mux(struct amdgpu_atpx *atpx, u16 mux_id) | |
307 | { | |
308 | struct acpi_buffer params; | |
309 | union acpi_object *info; | |
310 | struct atpx_mux input; | |
311 | ||
312 | if (atpx->functions.i2c_mux_cntl) { | |
313 | input.size = 4; | |
314 | input.mux = mux_id; | |
315 | params.length = input.size; | |
316 | params.pointer = &input; | |
317 | info = amdgpu_atpx_call(atpx->handle, | |
318 | ATPX_FUNCTION_I2C_MUX_CONTROL, | |
319 | ¶ms); | |
320 | if (!info) | |
321 | return -EIO; | |
322 | kfree(info); | |
323 | } | |
324 | return 0; | |
325 | } | |
326 | ||
327 | /** | |
328 | * amdgpu_atpx_switch_start - notify the sbios of a GPU switch | |
329 | * | |
330 | * @atpx: atpx info struct | |
331 | * @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU) | |
332 | * | |
333 | * Execute the ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_START_NOTIFICATION ATPX | |
334 | * function to notify the sbios that a switch between the discrete GPU and | |
335 | * integrated GPU has begun (all asics). | |
336 | * Returns 0 on success, error on failure. | |
337 | */ | |
338 | static int amdgpu_atpx_switch_start(struct amdgpu_atpx *atpx, u16 mux_id) | |
339 | { | |
340 | struct acpi_buffer params; | |
341 | union acpi_object *info; | |
342 | struct atpx_mux input; | |
343 | ||
344 | if (atpx->functions.switch_start) { | |
345 | input.size = 4; | |
346 | input.mux = mux_id; | |
347 | params.length = input.size; | |
348 | params.pointer = &input; | |
349 | info = amdgpu_atpx_call(atpx->handle, | |
350 | ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_START_NOTIFICATION, | |
351 | ¶ms); | |
352 | if (!info) | |
353 | return -EIO; | |
354 | kfree(info); | |
355 | } | |
356 | return 0; | |
357 | } | |
358 | ||
359 | /** | |
360 | * amdgpu_atpx_switch_end - notify the sbios of a GPU switch | |
361 | * | |
362 | * @atpx: atpx info struct | |
363 | * @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU) | |
364 | * | |
365 | * Execute the ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_END_NOTIFICATION ATPX | |
366 | * function to notify the sbios that a switch between the discrete GPU and | |
367 | * integrated GPU has ended (all asics). | |
368 | * Returns 0 on success, error on failure. | |
369 | */ | |
370 | static int amdgpu_atpx_switch_end(struct amdgpu_atpx *atpx, u16 mux_id) | |
371 | { | |
372 | struct acpi_buffer params; | |
373 | union acpi_object *info; | |
374 | struct atpx_mux input; | |
375 | ||
376 | if (atpx->functions.switch_end) { | |
377 | input.size = 4; | |
378 | input.mux = mux_id; | |
379 | params.length = input.size; | |
380 | params.pointer = &input; | |
381 | info = amdgpu_atpx_call(atpx->handle, | |
382 | ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_END_NOTIFICATION, | |
383 | ¶ms); | |
384 | if (!info) | |
385 | return -EIO; | |
386 | kfree(info); | |
387 | } | |
388 | return 0; | |
389 | } | |
390 | ||
391 | /** | |
392 | * amdgpu_atpx_switchto - switch to the requested GPU | |
393 | * | |
394 | * @id: GPU to switch to | |
395 | * | |
396 | * Execute the necessary ATPX functions to switch between the discrete GPU and | |
397 | * integrated GPU (all asics). | |
398 | * Returns 0 on success, error on failure. | |
399 | */ | |
400 | static int amdgpu_atpx_switchto(enum vga_switcheroo_client_id id) | |
401 | { | |
402 | u16 gpu_id; | |
403 | ||
404 | if (id == VGA_SWITCHEROO_IGD) | |
405 | gpu_id = ATPX_INTEGRATED_GPU; | |
406 | else | |
407 | gpu_id = ATPX_DISCRETE_GPU; | |
408 | ||
409 | amdgpu_atpx_switch_start(&amdgpu_atpx_priv.atpx, gpu_id); | |
410 | amdgpu_atpx_switch_disp_mux(&amdgpu_atpx_priv.atpx, gpu_id); | |
411 | amdgpu_atpx_switch_i2c_mux(&amdgpu_atpx_priv.atpx, gpu_id); | |
412 | amdgpu_atpx_switch_end(&amdgpu_atpx_priv.atpx, gpu_id); | |
413 | ||
414 | return 0; | |
415 | } | |
416 | ||
417 | /** | |
418 | * amdgpu_atpx_power_state - power down/up the requested GPU | |
419 | * | |
420 | * @id: GPU to power down/up | |
421 | * @state: requested power state (0 = off, 1 = on) | |
422 | * | |
423 | * Execute the necessary ATPX function to power down/up the discrete GPU | |
424 | * (all asics). | |
425 | * Returns 0 on success, error on failure. | |
426 | */ | |
427 | static int amdgpu_atpx_power_state(enum vga_switcheroo_client_id id, | |
428 | enum vga_switcheroo_state state) | |
429 | { | |
430 | /* on w500 ACPI can't change intel gpu state */ | |
431 | if (id == VGA_SWITCHEROO_IGD) | |
432 | return 0; | |
433 | ||
434 | amdgpu_atpx_set_discrete_state(&amdgpu_atpx_priv.atpx, state); | |
435 | return 0; | |
436 | } | |
437 | ||
438 | /** | |
439 | * amdgpu_atpx_pci_probe_handle - look up the ATPX handle | |
440 | * | |
441 | * @pdev: pci device | |
442 | * | |
443 | * Look up the ATPX handles (all asics). | |
444 | * Returns true if the handles are found, false if not. | |
445 | */ | |
446 | static bool amdgpu_atpx_pci_probe_handle(struct pci_dev *pdev) | |
447 | { | |
448 | acpi_handle dhandle, atpx_handle; | |
449 | acpi_status status; | |
450 | ||
451 | dhandle = ACPI_HANDLE(&pdev->dev); | |
452 | if (!dhandle) | |
453 | return false; | |
454 | ||
455 | status = acpi_get_handle(dhandle, "ATPX", &atpx_handle); | |
456 | if (ACPI_FAILURE(status)) { | |
457 | amdgpu_atpx_priv.other_handle = dhandle; | |
458 | return false; | |
459 | } | |
460 | amdgpu_atpx_priv.dhandle = dhandle; | |
461 | amdgpu_atpx_priv.atpx.handle = atpx_handle; | |
462 | return true; | |
463 | } | |
464 | ||
465 | /** | |
466 | * amdgpu_atpx_init - verify the ATPX interface | |
467 | * | |
468 | * Verify the ATPX interface (all asics). | |
469 | * Returns 0 on success, error on failure. | |
470 | */ | |
471 | static int amdgpu_atpx_init(void) | |
472 | { | |
473 | int r; | |
474 | ||
475 | /* set up the ATPX handle */ | |
476 | r = amdgpu_atpx_verify_interface(&amdgpu_atpx_priv.atpx); | |
477 | if (r) | |
478 | return r; | |
479 | ||
480 | /* validate the atpx setup */ | |
481 | r = amdgpu_atpx_validate(&amdgpu_atpx_priv.atpx); | |
482 | if (r) | |
483 | return r; | |
484 | ||
485 | return 0; | |
486 | } | |
487 | ||
488 | /** | |
489 | * amdgpu_atpx_get_client_id - get the client id | |
490 | * | |
491 | * @pdev: pci device | |
492 | * | |
493 | * look up whether we are the integrated or discrete GPU (all asics). | |
494 | * Returns the client id. | |
495 | */ | |
496 | static int amdgpu_atpx_get_client_id(struct pci_dev *pdev) | |
497 | { | |
498 | if (amdgpu_atpx_priv.dhandle == ACPI_HANDLE(&pdev->dev)) | |
499 | return VGA_SWITCHEROO_IGD; | |
500 | else | |
501 | return VGA_SWITCHEROO_DIS; | |
502 | } | |
503 | ||
504 | static struct vga_switcheroo_handler amdgpu_atpx_handler = { | |
505 | .switchto = amdgpu_atpx_switchto, | |
506 | .power_state = amdgpu_atpx_power_state, | |
507 | .init = amdgpu_atpx_init, | |
508 | .get_client_id = amdgpu_atpx_get_client_id, | |
509 | }; | |
510 | ||
511 | /** | |
512 | * amdgpu_atpx_detect - detect whether we have PX | |
513 | * | |
514 | * Check if we have a PX system (all asics). | |
515 | * Returns true if we have a PX system, false if not. | |
516 | */ | |
517 | static bool amdgpu_atpx_detect(void) | |
518 | { | |
519 | char acpi_method_name[255] = { 0 }; | |
520 | struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name}; | |
521 | struct pci_dev *pdev = NULL; | |
522 | bool has_atpx = false; | |
523 | int vga_count = 0; | |
524 | ||
525 | while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) { | |
526 | vga_count++; | |
527 | ||
528 | has_atpx |= (amdgpu_atpx_pci_probe_handle(pdev) == true); | |
529 | } | |
530 | ||
531 | while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_OTHER << 8, pdev)) != NULL) { | |
532 | vga_count++; | |
533 | ||
534 | has_atpx |= (amdgpu_atpx_pci_probe_handle(pdev) == true); | |
535 | } | |
536 | ||
537 | if (has_atpx && vga_count == 2) { | |
538 | acpi_get_name(amdgpu_atpx_priv.atpx.handle, ACPI_FULL_PATHNAME, &buffer); | |
539 | printk(KERN_INFO "VGA switcheroo: detected switching method %s handle\n", | |
540 | acpi_method_name); | |
541 | amdgpu_atpx_priv.atpx_detected = true; | |
542 | return true; | |
543 | } | |
544 | return false; | |
545 | } | |
546 | ||
547 | /** | |
548 | * amdgpu_register_atpx_handler - register with vga_switcheroo | |
549 | * | |
550 | * Register the PX callbacks with vga_switcheroo (all asics). | |
551 | */ | |
552 | void amdgpu_register_atpx_handler(void) | |
553 | { | |
554 | bool r; | |
555 | ||
556 | /* detect if we have any ATPX + 2 VGA in the system */ | |
557 | r = amdgpu_atpx_detect(); | |
558 | if (!r) | |
559 | return; | |
560 | ||
561 | vga_switcheroo_register_handler(&amdgpu_atpx_handler); | |
562 | } | |
563 | ||
564 | /** | |
565 | * amdgpu_unregister_atpx_handler - unregister with vga_switcheroo | |
566 | * | |
567 | * Unregister the PX callbacks with vga_switcheroo (all asics). | |
568 | */ | |
569 | void amdgpu_unregister_atpx_handler(void) | |
570 | { | |
571 | vga_switcheroo_unregister_handler(); | |
572 | } |