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#include <linux/delay.h>
14
15#include "amd_acpi.h"
16
17#define AMDGPU_PX_QUIRK_FORCE_ATPX (1 << 0)
18
19struct amdgpu_px_quirk {
20 u32 chip_vendor;
21 u32 chip_device;
22 u32 subsys_vendor;
23 u32 subsys_device;
24 u32 px_quirk_flags;
25};
26
27struct amdgpu_atpx_functions {
28 bool px_params;
29 bool power_cntl;
30 bool disp_mux_cntl;
31 bool i2c_mux_cntl;
32 bool switch_start;
33 bool switch_end;
34 bool disp_connectors_mapping;
35 bool disp_detection_ports;
36};
37
38struct amdgpu_atpx {
39 acpi_handle handle;
40 struct amdgpu_atpx_functions functions;
41 bool is_hybrid;
42 bool dgpu_req_power_for_displays;
43};
44
45static struct amdgpu_atpx_priv {
46 bool atpx_detected;
47 bool bridge_pm_usable;
48 unsigned int quirks;
49 /* handle for device - and atpx */
50 acpi_handle dhandle;
51 acpi_handle other_handle;
52 struct amdgpu_atpx atpx;
53} amdgpu_atpx_priv;
54
55struct atpx_verify_interface {
56 u16 size; /* structure size in bytes (includes size field) */
57 u16 version; /* version */
58 u32 function_bits; /* supported functions bit vector */
59} __packed;
60
61struct atpx_px_params {
62 u16 size; /* structure size in bytes (includes size field) */
63 u32 valid_flags; /* which flags are valid */
64 u32 flags; /* flags */
65} __packed;
66
67struct atpx_power_control {
68 u16 size;
69 u8 dgpu_state;
70} __packed;
71
72struct atpx_mux {
73 u16 size;
74 u16 mux;
75} __packed;
76
77bool amdgpu_has_atpx(void) {
78 return amdgpu_atpx_priv.atpx_detected;
79}
80
81bool amdgpu_has_atpx_dgpu_power_cntl(void) {
82 return amdgpu_atpx_priv.atpx.functions.power_cntl;
83}
84
85bool amdgpu_is_atpx_hybrid(void) {
86 return amdgpu_atpx_priv.atpx.is_hybrid;
87}
88
89bool amdgpu_atpx_dgpu_req_power_for_displays(void) {
90 return amdgpu_atpx_priv.atpx.dgpu_req_power_for_displays;
91}
92
93#if defined(CONFIG_ACPI)
94void *amdgpu_atpx_get_dhandle(void) {
95 return amdgpu_atpx_priv.dhandle;
96}
97#endif
98
99/**
100 * amdgpu_atpx_call - call an ATPX method
101 *
102 * @handle: acpi handle
103 * @function: the ATPX function to execute
104 * @params: ATPX function params
105 *
106 * Executes the requested ATPX function (all asics).
107 * Returns a pointer to the acpi output buffer.
108 */
109static union acpi_object *amdgpu_atpx_call(acpi_handle handle, int function,
110 struct acpi_buffer *params)
111{
112 acpi_status status;
113 union acpi_object atpx_arg_elements[2];
114 struct acpi_object_list atpx_arg;
115 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
116
117 atpx_arg.count = 2;
118 atpx_arg.pointer = &atpx_arg_elements[0];
119
120 atpx_arg_elements[0].type = ACPI_TYPE_INTEGER;
121 atpx_arg_elements[0].integer.value = function;
122
123 if (params) {
124 atpx_arg_elements[1].type = ACPI_TYPE_BUFFER;
125 atpx_arg_elements[1].buffer.length = params->length;
126 atpx_arg_elements[1].buffer.pointer = params->pointer;
127 } else {
128 /* We need a second fake parameter */
129 atpx_arg_elements[1].type = ACPI_TYPE_INTEGER;
130 atpx_arg_elements[1].integer.value = 0;
131 }
132
133 status = acpi_evaluate_object(handle, NULL, &atpx_arg, &buffer);
134
135 /* Fail only if calling the method fails and ATPX is supported */
136 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
137 printk("failed to evaluate ATPX got %s\n",
138 acpi_format_exception(status));
139 kfree(buffer.pointer);
140 return NULL;
141 }
142
143 return buffer.pointer;
144}
145
146/**
147 * amdgpu_atpx_parse_functions - parse supported functions
148 *
149 * @f: supported functions struct
150 * @mask: supported functions mask from ATPX
151 *
152 * Use the supported functions mask from ATPX function
153 * ATPX_FUNCTION_VERIFY_INTERFACE to determine what functions
154 * are supported (all asics).
155 */
156static void amdgpu_atpx_parse_functions(struct amdgpu_atpx_functions *f, u32 mask)
157{
158 f->px_params = mask & ATPX_GET_PX_PARAMETERS_SUPPORTED;
159 f->power_cntl = mask & ATPX_POWER_CONTROL_SUPPORTED;
160 f->disp_mux_cntl = mask & ATPX_DISPLAY_MUX_CONTROL_SUPPORTED;
161 f->i2c_mux_cntl = mask & ATPX_I2C_MUX_CONTROL_SUPPORTED;
162 f->switch_start = mask & ATPX_GRAPHICS_DEVICE_SWITCH_START_NOTIFICATION_SUPPORTED;
163 f->switch_end = mask & ATPX_GRAPHICS_DEVICE_SWITCH_END_NOTIFICATION_SUPPORTED;
164 f->disp_connectors_mapping = mask & ATPX_GET_DISPLAY_CONNECTORS_MAPPING_SUPPORTED;
165 f->disp_detection_ports = mask & ATPX_GET_DISPLAY_DETECTION_PORTS_SUPPORTED;
166}
167
168/**
169 * amdgpu_atpx_validate_functions - validate ATPX functions
170 *
171 * @atpx: amdgpu atpx struct
172 *
173 * Validate that required functions are enabled (all asics).
174 * returns 0 on success, error on failure.
175 */
176static int amdgpu_atpx_validate(struct amdgpu_atpx *atpx)
177{
178 u32 valid_bits = 0;
179
180 if (atpx->functions.px_params) {
181 union acpi_object *info;
182 struct atpx_px_params output;
183 size_t size;
184
185 info = amdgpu_atpx_call(atpx->handle, ATPX_FUNCTION_GET_PX_PARAMETERS, NULL);
186 if (!info)
187 return -EIO;
188
189 memset(&output, 0, sizeof(output));
190
191 size = *(u16 *) info->buffer.pointer;
192 if (size < 10) {
193 printk("ATPX buffer is too small: %zu\n", size);
194 kfree(info);
195 return -EINVAL;
196 }
197 size = min(sizeof(output), size);
198
199 memcpy(&output, info->buffer.pointer, size);
200
201 valid_bits = output.flags & output.valid_flags;
202
203 kfree(info);
204 }
205
206 /* if separate mux flag is set, mux controls are required */
207 if (valid_bits & ATPX_SEPARATE_MUX_FOR_I2C) {
208 atpx->functions.i2c_mux_cntl = true;
209 atpx->functions.disp_mux_cntl = true;
210 }
211 /* if any outputs are muxed, mux controls are required */
212 if (valid_bits & (ATPX_CRT1_RGB_SIGNAL_MUXED |
213 ATPX_TV_SIGNAL_MUXED |
214 ATPX_DFP_SIGNAL_MUXED))
215 atpx->functions.disp_mux_cntl = true;
216
217
218 /* some bioses set these bits rather than flagging power_cntl as supported */
219 if (valid_bits & (ATPX_DYNAMIC_PX_SUPPORTED |
220 ATPX_DYNAMIC_DGPU_POWER_OFF_SUPPORTED))
221 atpx->functions.power_cntl = true;
222
223 atpx->is_hybrid = false;
224 if (valid_bits & ATPX_MS_HYBRID_GFX_SUPPORTED) {
225 if (amdgpu_atpx_priv.quirks & AMDGPU_PX_QUIRK_FORCE_ATPX) {
226 printk("ATPX Hybrid Graphics, forcing to ATPX\n");
227 atpx->functions.power_cntl = true;
228 atpx->is_hybrid = false;
229 } else {
230 printk("ATPX Hybrid Graphics\n");
231 /*
232 * Disable legacy PM methods only when pcie port PM is usable,
233 * otherwise the device might fail to power off or power on.
234 */
235 atpx->functions.power_cntl = !amdgpu_atpx_priv.bridge_pm_usable;
236 atpx->is_hybrid = true;
237 }
238 }
239
240 atpx->dgpu_req_power_for_displays = false;
241 if (valid_bits & ATPX_DGPU_REQ_POWER_FOR_DISPLAYS)
242 atpx->dgpu_req_power_for_displays = true;
243
244 return 0;
245}
246
247/**
248 * amdgpu_atpx_verify_interface - verify ATPX
249 *
250 * @atpx: amdgpu atpx struct
251 *
252 * Execute the ATPX_FUNCTION_VERIFY_INTERFACE ATPX function
253 * to initialize ATPX and determine what features are supported
254 * (all asics).
255 * returns 0 on success, error on failure.
256 */
257static int amdgpu_atpx_verify_interface(struct amdgpu_atpx *atpx)
258{
259 union acpi_object *info;
260 struct atpx_verify_interface output;
261 size_t size;
262 int err = 0;
263
264 info = amdgpu_atpx_call(atpx->handle, ATPX_FUNCTION_VERIFY_INTERFACE, NULL);
265 if (!info)
266 return -EIO;
267
268 memset(&output, 0, sizeof(output));
269
270 size = *(u16 *) info->buffer.pointer;
271 if (size < 8) {
272 printk("ATPX buffer is too small: %zu\n", size);
273 err = -EINVAL;
274 goto out;
275 }
276 size = min(sizeof(output), size);
277
278 memcpy(&output, info->buffer.pointer, size);
279
280 /* TODO: check version? */
281 printk("ATPX version %u, functions 0x%08x\n",
282 output.version, output.function_bits);
283
284 amdgpu_atpx_parse_functions(&atpx->functions, output.function_bits);
285
286out:
287 kfree(info);
288 return err;
289}
290
291/**
292 * amdgpu_atpx_set_discrete_state - power up/down discrete GPU
293 *
294 * @atpx: atpx info struct
295 * @state: discrete GPU state (0 = power down, 1 = power up)
296 *
297 * Execute the ATPX_FUNCTION_POWER_CONTROL ATPX function to
298 * power down/up the discrete GPU (all asics).
299 * Returns 0 on success, error on failure.
300 */
301static int amdgpu_atpx_set_discrete_state(struct amdgpu_atpx *atpx, u8 state)
302{
303 struct acpi_buffer params;
304 union acpi_object *info;
305 struct atpx_power_control input;
306
307 if (atpx->functions.power_cntl) {
308 input.size = 3;
309 input.dgpu_state = state;
310 params.length = input.size;
311 params.pointer = &input;
312 info = amdgpu_atpx_call(atpx->handle,
313 ATPX_FUNCTION_POWER_CONTROL,
314 &params);
315 if (!info)
316 return -EIO;
317 kfree(info);
318
319 /* 200ms delay is required after off */
320 if (state == 0)
321 msleep(200);
322 }
323 return 0;
324}
325
326/**
327 * amdgpu_atpx_switch_disp_mux - switch display mux
328 *
329 * @atpx: atpx info struct
330 * @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU)
331 *
332 * Execute the ATPX_FUNCTION_DISPLAY_MUX_CONTROL ATPX function to
333 * switch the display mux between the discrete GPU and integrated GPU
334 * (all asics).
335 * Returns 0 on success, error on failure.
336 */
337static int amdgpu_atpx_switch_disp_mux(struct amdgpu_atpx *atpx, u16 mux_id)
338{
339 struct acpi_buffer params;
340 union acpi_object *info;
341 struct atpx_mux input;
342
343 if (atpx->functions.disp_mux_cntl) {
344 input.size = 4;
345 input.mux = mux_id;
346 params.length = input.size;
347 params.pointer = &input;
348 info = amdgpu_atpx_call(atpx->handle,
349 ATPX_FUNCTION_DISPLAY_MUX_CONTROL,
350 &params);
351 if (!info)
352 return -EIO;
353 kfree(info);
354 }
355 return 0;
356}
357
358/**
359 * amdgpu_atpx_switch_i2c_mux - switch i2c/hpd mux
360 *
361 * @atpx: atpx info struct
362 * @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU)
363 *
364 * Execute the ATPX_FUNCTION_I2C_MUX_CONTROL ATPX function to
365 * switch the i2c/hpd mux between the discrete GPU and integrated GPU
366 * (all asics).
367 * Returns 0 on success, error on failure.
368 */
369static int amdgpu_atpx_switch_i2c_mux(struct amdgpu_atpx *atpx, u16 mux_id)
370{
371 struct acpi_buffer params;
372 union acpi_object *info;
373 struct atpx_mux input;
374
375 if (atpx->functions.i2c_mux_cntl) {
376 input.size = 4;
377 input.mux = mux_id;
378 params.length = input.size;
379 params.pointer = &input;
380 info = amdgpu_atpx_call(atpx->handle,
381 ATPX_FUNCTION_I2C_MUX_CONTROL,
382 &params);
383 if (!info)
384 return -EIO;
385 kfree(info);
386 }
387 return 0;
388}
389
390/**
391 * amdgpu_atpx_switch_start - notify the sbios of a GPU switch
392 *
393 * @atpx: atpx info struct
394 * @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU)
395 *
396 * Execute the ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_START_NOTIFICATION ATPX
397 * function to notify the sbios that a switch between the discrete GPU and
398 * integrated GPU has begun (all asics).
399 * Returns 0 on success, error on failure.
400 */
401static int amdgpu_atpx_switch_start(struct amdgpu_atpx *atpx, u16 mux_id)
402{
403 struct acpi_buffer params;
404 union acpi_object *info;
405 struct atpx_mux input;
406
407 if (atpx->functions.switch_start) {
408 input.size = 4;
409 input.mux = mux_id;
410 params.length = input.size;
411 params.pointer = &input;
412 info = amdgpu_atpx_call(atpx->handle,
413 ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_START_NOTIFICATION,
414 &params);
415 if (!info)
416 return -EIO;
417 kfree(info);
418 }
419 return 0;
420}
421
422/**
423 * amdgpu_atpx_switch_end - notify the sbios of a GPU switch
424 *
425 * @atpx: atpx info struct
426 * @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU)
427 *
428 * Execute the ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_END_NOTIFICATION ATPX
429 * function to notify the sbios that a switch between the discrete GPU and
430 * integrated GPU has ended (all asics).
431 * Returns 0 on success, error on failure.
432 */
433static int amdgpu_atpx_switch_end(struct amdgpu_atpx *atpx, u16 mux_id)
434{
435 struct acpi_buffer params;
436 union acpi_object *info;
437 struct atpx_mux input;
438
439 if (atpx->functions.switch_end) {
440 input.size = 4;
441 input.mux = mux_id;
442 params.length = input.size;
443 params.pointer = &input;
444 info = amdgpu_atpx_call(atpx->handle,
445 ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_END_NOTIFICATION,
446 &params);
447 if (!info)
448 return -EIO;
449 kfree(info);
450 }
451 return 0;
452}
453
454/**
455 * amdgpu_atpx_switchto - switch to the requested GPU
456 *
457 * @id: GPU to switch to
458 *
459 * Execute the necessary ATPX functions to switch between the discrete GPU and
460 * integrated GPU (all asics).
461 * Returns 0 on success, error on failure.
462 */
463static int amdgpu_atpx_switchto(enum vga_switcheroo_client_id id)
464{
465 u16 gpu_id;
466
467 if (id == VGA_SWITCHEROO_IGD)
468 gpu_id = ATPX_INTEGRATED_GPU;
469 else
470 gpu_id = ATPX_DISCRETE_GPU;
471
472 amdgpu_atpx_switch_start(&amdgpu_atpx_priv.atpx, gpu_id);
473 amdgpu_atpx_switch_disp_mux(&amdgpu_atpx_priv.atpx, gpu_id);
474 amdgpu_atpx_switch_i2c_mux(&amdgpu_atpx_priv.atpx, gpu_id);
475 amdgpu_atpx_switch_end(&amdgpu_atpx_priv.atpx, gpu_id);
476
477 return 0;
478}
479
480/**
481 * amdgpu_atpx_power_state - power down/up the requested GPU
482 *
483 * @id: GPU to power down/up
484 * @state: requested power state (0 = off, 1 = on)
485 *
486 * Execute the necessary ATPX function to power down/up the discrete GPU
487 * (all asics).
488 * Returns 0 on success, error on failure.
489 */
490static int amdgpu_atpx_power_state(enum vga_switcheroo_client_id id,
491 enum vga_switcheroo_state state)
492{
493 /* on w500 ACPI can't change intel gpu state */
494 if (id == VGA_SWITCHEROO_IGD)
495 return 0;
496
497 amdgpu_atpx_set_discrete_state(&amdgpu_atpx_priv.atpx, state);
498 return 0;
499}
500
501/**
502 * amdgpu_atpx_pci_probe_handle - look up the ATPX handle
503 *
504 * @pdev: pci device
505 *
506 * Look up the ATPX handles (all asics).
507 * Returns true if the handles are found, false if not.
508 */
509static bool amdgpu_atpx_pci_probe_handle(struct pci_dev *pdev)
510{
511 acpi_handle dhandle, atpx_handle;
512 acpi_status status;
513
514 dhandle = ACPI_HANDLE(&pdev->dev);
515 if (!dhandle)
516 return false;
517
518 status = acpi_get_handle(dhandle, "ATPX", &atpx_handle);
519 if (ACPI_FAILURE(status)) {
520 amdgpu_atpx_priv.other_handle = dhandle;
521 return false;
522 }
523 amdgpu_atpx_priv.dhandle = dhandle;
524 amdgpu_atpx_priv.atpx.handle = atpx_handle;
525 return true;
526}
527
528/**
529 * amdgpu_atpx_init - verify the ATPX interface
530 *
531 * Verify the ATPX interface (all asics).
532 * Returns 0 on success, error on failure.
533 */
534static int amdgpu_atpx_init(void)
535{
536 int r;
537
538 /* set up the ATPX handle */
539 r = amdgpu_atpx_verify_interface(&amdgpu_atpx_priv.atpx);
540 if (r)
541 return r;
542
543 /* validate the atpx setup */
544 r = amdgpu_atpx_validate(&amdgpu_atpx_priv.atpx);
545 if (r)
546 return r;
547
548 return 0;
549}
550
551/**
552 * amdgpu_atpx_get_client_id - get the client id
553 *
554 * @pdev: pci device
555 *
556 * look up whether we are the integrated or discrete GPU (all asics).
557 * Returns the client id.
558 */
559static enum vga_switcheroo_client_id amdgpu_atpx_get_client_id(struct pci_dev *pdev)
560{
561 if (amdgpu_atpx_priv.dhandle == ACPI_HANDLE(&pdev->dev))
562 return VGA_SWITCHEROO_IGD;
563 else
564 return VGA_SWITCHEROO_DIS;
565}
566
567static const struct vga_switcheroo_handler amdgpu_atpx_handler = {
568 .switchto = amdgpu_atpx_switchto,
569 .power_state = amdgpu_atpx_power_state,
570 .get_client_id = amdgpu_atpx_get_client_id,
571};
572
573static const struct amdgpu_px_quirk amdgpu_px_quirk_list[] = {
574 /* HG _PR3 doesn't seem to work on this A+A weston board */
575 { 0x1002, 0x6900, 0x1002, 0x0124, AMDGPU_PX_QUIRK_FORCE_ATPX },
576 { 0x1002, 0x6900, 0x1028, 0x0812, AMDGPU_PX_QUIRK_FORCE_ATPX },
577 { 0x1002, 0x6900, 0x1028, 0x0813, AMDGPU_PX_QUIRK_FORCE_ATPX },
578 { 0x1002, 0x6900, 0x1025, 0x125A, AMDGPU_PX_QUIRK_FORCE_ATPX },
579 { 0x1002, 0x6900, 0x17AA, 0x3806, AMDGPU_PX_QUIRK_FORCE_ATPX },
580 { 0, 0, 0, 0, 0 },
581};
582
583static void amdgpu_atpx_get_quirks(struct pci_dev *pdev)
584{
585 const struct amdgpu_px_quirk *p = amdgpu_px_quirk_list;
586
587 /* Apply PX quirks */
588 while (p && p->chip_device != 0) {
589 if (pdev->vendor == p->chip_vendor &&
590 pdev->device == p->chip_device &&
591 pdev->subsystem_vendor == p->subsys_vendor &&
592 pdev->subsystem_device == p->subsys_device) {
593 amdgpu_atpx_priv.quirks |= p->px_quirk_flags;
594 break;
595 }
596 ++p;
597 }
598}
599
600/**
601 * amdgpu_atpx_detect - detect whether we have PX
602 *
603 * Check if we have a PX system (all asics).
604 * Returns true if we have a PX system, false if not.
605 */
606static bool amdgpu_atpx_detect(void)
607{
608 char acpi_method_name[255] = { 0 };
609 struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
610 struct pci_dev *pdev = NULL;
611 bool has_atpx = false;
612 int vga_count = 0;
613 bool d3_supported = false;
614 struct pci_dev *parent_pdev;
615
616 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
617 vga_count++;
618
619 has_atpx |= (amdgpu_atpx_pci_probe_handle(pdev) == true);
620
621 parent_pdev = pci_upstream_bridge(pdev);
622 d3_supported |= parent_pdev && parent_pdev->bridge_d3;
623 amdgpu_atpx_get_quirks(pdev);
624 }
625
626 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_OTHER << 8, pdev)) != NULL) {
627 vga_count++;
628
629 has_atpx |= (amdgpu_atpx_pci_probe_handle(pdev) == true);
630
631 parent_pdev = pci_upstream_bridge(pdev);
632 d3_supported |= parent_pdev && parent_pdev->bridge_d3;
633 amdgpu_atpx_get_quirks(pdev);
634 }
635
636 if (has_atpx && vga_count == 2) {
637 acpi_get_name(amdgpu_atpx_priv.atpx.handle, ACPI_FULL_PATHNAME, &buffer);
638 pr_info("vga_switcheroo: detected switching method %s handle\n",
639 acpi_method_name);
640 amdgpu_atpx_priv.atpx_detected = true;
641 amdgpu_atpx_priv.bridge_pm_usable = d3_supported;
642 amdgpu_atpx_init();
643 return true;
644 }
645 return false;
646}
647
648/**
649 * amdgpu_register_atpx_handler - register with vga_switcheroo
650 *
651 * Register the PX callbacks with vga_switcheroo (all asics).
652 */
653void amdgpu_register_atpx_handler(void)
654{
655 bool r;
656 enum vga_switcheroo_handler_flags_t handler_flags = 0;
657
658 /* detect if we have any ATPX + 2 VGA in the system */
659 r = amdgpu_atpx_detect();
660 if (!r)
661 return;
662
663 vga_switcheroo_register_handler(&amdgpu_atpx_handler, handler_flags);
664}
665
666/**
667 * amdgpu_unregister_atpx_handler - unregister with vga_switcheroo
668 *
669 * Unregister the PX callbacks with vga_switcheroo (all asics).
670 */
671void amdgpu_unregister_atpx_handler(void)
672{
673 vga_switcheroo_unregister_handler();
674}
675