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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 "radeon_acpi.h"
15
16struct radeon_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
27struct radeon_atpx {
28 acpi_handle handle;
29 struct radeon_atpx_functions functions;
30};
31
32static struct radeon_atpx_priv {
33 bool atpx_detected;
34 /* handle for device - and atpx */
35 acpi_handle dhandle;
36 struct radeon_atpx atpx;
37} radeon_atpx_priv;
38
39struct atpx_verify_interface {
40 u16 size; /* structure size in bytes (includes size field) */
41 u16 version; /* version */
42 u32 function_bits; /* supported functions bit vector */
43} __packed;
44
45struct atpx_px_params {
46 u16 size; /* structure size in bytes (includes size field) */
47 u32 valid_flags; /* which flags are valid */
48 u32 flags; /* flags */
49} __packed;
50
51struct atpx_power_control {
52 u16 size;
53 u8 dgpu_state;
54} __packed;
55
56struct atpx_mux {
57 u16 size;
58 u16 mux;
59} __packed;
60
61bool radeon_has_atpx(void) {
62 return radeon_atpx_priv.atpx_detected;
63}
64
65/**
66 * radeon_atpx_call - call an ATPX method
67 *
68 * @handle: acpi handle
69 * @function: the ATPX function to execute
70 * @params: ATPX function params
71 *
72 * Executes the requested ATPX function (all asics).
73 * Returns a pointer to the acpi output buffer.
74 */
75static union acpi_object *radeon_atpx_call(acpi_handle handle, int function,
76 struct acpi_buffer *params)
77{
78 acpi_status status;
79 union acpi_object atpx_arg_elements[2];
80 struct acpi_object_list atpx_arg;
81 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
82
83 atpx_arg.count = 2;
84 atpx_arg.pointer = &atpx_arg_elements[0];
85
86 atpx_arg_elements[0].type = ACPI_TYPE_INTEGER;
87 atpx_arg_elements[0].integer.value = function;
88
89 if (params) {
90 atpx_arg_elements[1].type = ACPI_TYPE_BUFFER;
91 atpx_arg_elements[1].buffer.length = params->length;
92 atpx_arg_elements[1].buffer.pointer = params->pointer;
93 } else {
94 /* We need a second fake parameter */
95 atpx_arg_elements[1].type = ACPI_TYPE_INTEGER;
96 atpx_arg_elements[1].integer.value = 0;
97 }
98
99 status = acpi_evaluate_object(handle, NULL, &atpx_arg, &buffer);
100
101 /* Fail only if calling the method fails and ATPX is supported */
102 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
103 printk("failed to evaluate ATPX got %s\n",
104 acpi_format_exception(status));
105 kfree(buffer.pointer);
106 return NULL;
107 }
108
109 return buffer.pointer;
110}
111
112/**
113 * radeon_atpx_parse_functions - parse supported functions
114 *
115 * @f: supported functions struct
116 * @mask: supported functions mask from ATPX
117 *
118 * Use the supported functions mask from ATPX function
119 * ATPX_FUNCTION_VERIFY_INTERFACE to determine what functions
120 * are supported (all asics).
121 */
122static void radeon_atpx_parse_functions(struct radeon_atpx_functions *f, u32 mask)
123{
124 f->px_params = mask & ATPX_GET_PX_PARAMETERS_SUPPORTED;
125 f->power_cntl = mask & ATPX_POWER_CONTROL_SUPPORTED;
126 f->disp_mux_cntl = mask & ATPX_DISPLAY_MUX_CONTROL_SUPPORTED;
127 f->i2c_mux_cntl = mask & ATPX_I2C_MUX_CONTROL_SUPPORTED;
128 f->switch_start = mask & ATPX_GRAPHICS_DEVICE_SWITCH_START_NOTIFICATION_SUPPORTED;
129 f->switch_end = mask & ATPX_GRAPHICS_DEVICE_SWITCH_END_NOTIFICATION_SUPPORTED;
130 f->disp_connectors_mapping = mask & ATPX_GET_DISPLAY_CONNECTORS_MAPPING_SUPPORTED;
131 f->disp_detetion_ports = mask & ATPX_GET_DISPLAY_DETECTION_PORTS_SUPPORTED;
132}
133
134/**
135 * radeon_atpx_validate_functions - validate ATPX functions
136 *
137 * @atpx: radeon atpx struct
138 *
139 * Validate that required functions are enabled (all asics).
140 * returns 0 on success, error on failure.
141 */
142static int radeon_atpx_validate(struct radeon_atpx *atpx)
143{
144 /* make sure required functions are enabled */
145 /* dGPU power control is required */
146 if (atpx->functions.power_cntl == false) {
147 printk("ATPX dGPU power cntl not present, forcing\n");
148 atpx->functions.power_cntl = true;
149 }
150
151 if (atpx->functions.px_params) {
152 union acpi_object *info;
153 struct atpx_px_params output;
154 size_t size;
155 u32 valid_bits;
156
157 info = radeon_atpx_call(atpx->handle, ATPX_FUNCTION_GET_PX_PARAMETERS, NULL);
158 if (!info)
159 return -EIO;
160
161 memset(&output, 0, sizeof(output));
162
163 size = *(u16 *) info->buffer.pointer;
164 if (size < 10) {
165 printk("ATPX buffer is too small: %zu\n", size);
166 kfree(info);
167 return -EINVAL;
168 }
169 size = min(sizeof(output), size);
170
171 memcpy(&output, info->buffer.pointer, size);
172
173 valid_bits = output.flags & output.valid_flags;
174 /* if separate mux flag is set, mux controls are required */
175 if (valid_bits & ATPX_SEPARATE_MUX_FOR_I2C) {
176 atpx->functions.i2c_mux_cntl = true;
177 atpx->functions.disp_mux_cntl = true;
178 }
179 /* if any outputs are muxed, mux controls are required */
180 if (valid_bits & (ATPX_CRT1_RGB_SIGNAL_MUXED |
181 ATPX_TV_SIGNAL_MUXED |
182 ATPX_DFP_SIGNAL_MUXED))
183 atpx->functions.disp_mux_cntl = true;
184
185 kfree(info);
186 }
187 return 0;
188}
189
190/**
191 * radeon_atpx_verify_interface - verify ATPX
192 *
193 * @atpx: radeon atpx struct
194 *
195 * Execute the ATPX_FUNCTION_VERIFY_INTERFACE ATPX function
196 * to initialize ATPX and determine what features are supported
197 * (all asics).
198 * returns 0 on success, error on failure.
199 */
200static int radeon_atpx_verify_interface(struct radeon_atpx *atpx)
201{
202 union acpi_object *info;
203 struct atpx_verify_interface output;
204 size_t size;
205 int err = 0;
206
207 info = radeon_atpx_call(atpx->handle, ATPX_FUNCTION_VERIFY_INTERFACE, NULL);
208 if (!info)
209 return -EIO;
210
211 memset(&output, 0, sizeof(output));
212
213 size = *(u16 *) info->buffer.pointer;
214 if (size < 8) {
215 printk("ATPX buffer is too small: %zu\n", size);
216 err = -EINVAL;
217 goto out;
218 }
219 size = min(sizeof(output), size);
220
221 memcpy(&output, info->buffer.pointer, size);
222
223 /* TODO: check version? */
224 printk("ATPX version %u, functions 0x%08x\n",
225 output.version, output.function_bits);
226
227 radeon_atpx_parse_functions(&atpx->functions, output.function_bits);
228
229out:
230 kfree(info);
231 return err;
232}
233
234/**
235 * radeon_atpx_set_discrete_state - power up/down discrete GPU
236 *
237 * @atpx: atpx info struct
238 * @state: discrete GPU state (0 = power down, 1 = power up)
239 *
240 * Execute the ATPX_FUNCTION_POWER_CONTROL ATPX function to
241 * power down/up the discrete GPU (all asics).
242 * Returns 0 on success, error on failure.
243 */
244static int radeon_atpx_set_discrete_state(struct radeon_atpx *atpx, u8 state)
245{
246 struct acpi_buffer params;
247 union acpi_object *info;
248 struct atpx_power_control input;
249
250 if (atpx->functions.power_cntl) {
251 input.size = 3;
252 input.dgpu_state = state;
253 params.length = input.size;
254 params.pointer = &input;
255 info = radeon_atpx_call(atpx->handle,
256 ATPX_FUNCTION_POWER_CONTROL,
257 ¶ms);
258 if (!info)
259 return -EIO;
260 kfree(info);
261 }
262 return 0;
263}
264
265/**
266 * radeon_atpx_switch_disp_mux - switch display mux
267 *
268 * @atpx: atpx info struct
269 * @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU)
270 *
271 * Execute the ATPX_FUNCTION_DISPLAY_MUX_CONTROL ATPX function to
272 * switch the display mux between the discrete GPU and integrated GPU
273 * (all asics).
274 * Returns 0 on success, error on failure.
275 */
276static int radeon_atpx_switch_disp_mux(struct radeon_atpx *atpx, u16 mux_id)
277{
278 struct acpi_buffer params;
279 union acpi_object *info;
280 struct atpx_mux input;
281
282 if (atpx->functions.disp_mux_cntl) {
283 input.size = 4;
284 input.mux = mux_id;
285 params.length = input.size;
286 params.pointer = &input;
287 info = radeon_atpx_call(atpx->handle,
288 ATPX_FUNCTION_DISPLAY_MUX_CONTROL,
289 ¶ms);
290 if (!info)
291 return -EIO;
292 kfree(info);
293 }
294 return 0;
295}
296
297/**
298 * radeon_atpx_switch_i2c_mux - switch i2c/hpd mux
299 *
300 * @atpx: atpx info struct
301 * @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU)
302 *
303 * Execute the ATPX_FUNCTION_I2C_MUX_CONTROL ATPX function to
304 * switch the i2c/hpd mux between the discrete GPU and integrated GPU
305 * (all asics).
306 * Returns 0 on success, error on failure.
307 */
308static int radeon_atpx_switch_i2c_mux(struct radeon_atpx *atpx, u16 mux_id)
309{
310 struct acpi_buffer params;
311 union acpi_object *info;
312 struct atpx_mux input;
313
314 if (atpx->functions.i2c_mux_cntl) {
315 input.size = 4;
316 input.mux = mux_id;
317 params.length = input.size;
318 params.pointer = &input;
319 info = radeon_atpx_call(atpx->handle,
320 ATPX_FUNCTION_I2C_MUX_CONTROL,
321 ¶ms);
322 if (!info)
323 return -EIO;
324 kfree(info);
325 }
326 return 0;
327}
328
329/**
330 * radeon_atpx_switch_start - notify the sbios of a GPU switch
331 *
332 * @atpx: atpx info struct
333 * @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU)
334 *
335 * Execute the ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_START_NOTIFICATION ATPX
336 * function to notify the sbios that a switch between the discrete GPU and
337 * integrated GPU has begun (all asics).
338 * Returns 0 on success, error on failure.
339 */
340static int radeon_atpx_switch_start(struct radeon_atpx *atpx, u16 mux_id)
341{
342 struct acpi_buffer params;
343 union acpi_object *info;
344 struct atpx_mux input;
345
346 if (atpx->functions.switch_start) {
347 input.size = 4;
348 input.mux = mux_id;
349 params.length = input.size;
350 params.pointer = &input;
351 info = radeon_atpx_call(atpx->handle,
352 ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_START_NOTIFICATION,
353 ¶ms);
354 if (!info)
355 return -EIO;
356 kfree(info);
357 }
358 return 0;
359}
360
361/**
362 * radeon_atpx_switch_end - notify the sbios of a GPU switch
363 *
364 * @atpx: atpx info struct
365 * @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU)
366 *
367 * Execute the ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_END_NOTIFICATION ATPX
368 * function to notify the sbios that a switch between the discrete GPU and
369 * integrated GPU has ended (all asics).
370 * Returns 0 on success, error on failure.
371 */
372static int radeon_atpx_switch_end(struct radeon_atpx *atpx, u16 mux_id)
373{
374 struct acpi_buffer params;
375 union acpi_object *info;
376 struct atpx_mux input;
377
378 if (atpx->functions.switch_end) {
379 input.size = 4;
380 input.mux = mux_id;
381 params.length = input.size;
382 params.pointer = &input;
383 info = radeon_atpx_call(atpx->handle,
384 ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_END_NOTIFICATION,
385 ¶ms);
386 if (!info)
387 return -EIO;
388 kfree(info);
389 }
390 return 0;
391}
392
393/**
394 * radeon_atpx_switchto - switch to the requested GPU
395 *
396 * @id: GPU to switch to
397 *
398 * Execute the necessary ATPX functions to switch between the discrete GPU and
399 * integrated GPU (all asics).
400 * Returns 0 on success, error on failure.
401 */
402static int radeon_atpx_switchto(enum vga_switcheroo_client_id id)
403{
404 u16 gpu_id;
405
406 if (id == VGA_SWITCHEROO_IGD)
407 gpu_id = ATPX_INTEGRATED_GPU;
408 else
409 gpu_id = ATPX_DISCRETE_GPU;
410
411 radeon_atpx_switch_start(&radeon_atpx_priv.atpx, gpu_id);
412 radeon_atpx_switch_disp_mux(&radeon_atpx_priv.atpx, gpu_id);
413 radeon_atpx_switch_i2c_mux(&radeon_atpx_priv.atpx, gpu_id);
414 radeon_atpx_switch_end(&radeon_atpx_priv.atpx, gpu_id);
415
416 return 0;
417}
418
419/**
420 * radeon_atpx_power_state - power down/up the requested GPU
421 *
422 * @id: GPU to power down/up
423 * @state: requested power state (0 = off, 1 = on)
424 *
425 * Execute the necessary ATPX function to power down/up the discrete GPU
426 * (all asics).
427 * Returns 0 on success, error on failure.
428 */
429static int radeon_atpx_power_state(enum vga_switcheroo_client_id id,
430 enum vga_switcheroo_state state)
431{
432 /* on w500 ACPI can't change intel gpu state */
433 if (id == VGA_SWITCHEROO_IGD)
434 return 0;
435
436 radeon_atpx_set_discrete_state(&radeon_atpx_priv.atpx, state);
437 return 0;
438}
439
440/**
441 * radeon_atpx_pci_probe_handle - look up the ATPX handle
442 *
443 * @pdev: pci device
444 *
445 * Look up the ATPX handles (all asics).
446 * Returns true if the handles are found, false if not.
447 */
448static bool radeon_atpx_pci_probe_handle(struct pci_dev *pdev)
449{
450 acpi_handle dhandle, atpx_handle;
451 acpi_status status;
452
453 dhandle = ACPI_HANDLE(&pdev->dev);
454 if (!dhandle)
455 return false;
456
457 status = acpi_get_handle(dhandle, "ATPX", &atpx_handle);
458 if (ACPI_FAILURE(status))
459 return false;
460
461 radeon_atpx_priv.dhandle = dhandle;
462 radeon_atpx_priv.atpx.handle = atpx_handle;
463 return true;
464}
465
466/**
467 * radeon_atpx_init - verify the ATPX interface
468 *
469 * Verify the ATPX interface (all asics).
470 * Returns 0 on success, error on failure.
471 */
472static int radeon_atpx_init(void)
473{
474 int r;
475
476 /* set up the ATPX handle */
477 r = radeon_atpx_verify_interface(&radeon_atpx_priv.atpx);
478 if (r)
479 return r;
480
481 /* validate the atpx setup */
482 r = radeon_atpx_validate(&radeon_atpx_priv.atpx);
483 if (r)
484 return r;
485
486 return 0;
487}
488
489/**
490 * radeon_atpx_get_client_id - get the client id
491 *
492 * @pdev: pci device
493 *
494 * look up whether we are the integrated or discrete GPU (all asics).
495 * Returns the client id.
496 */
497static int radeon_atpx_get_client_id(struct pci_dev *pdev)
498{
499 if (radeon_atpx_priv.dhandle == ACPI_HANDLE(&pdev->dev))
500 return VGA_SWITCHEROO_IGD;
501 else
502 return VGA_SWITCHEROO_DIS;
503}
504
505static const struct vga_switcheroo_handler radeon_atpx_handler = {
506 .switchto = radeon_atpx_switchto,
507 .power_state = radeon_atpx_power_state,
508 .init = radeon_atpx_init,
509 .get_client_id = radeon_atpx_get_client_id,
510};
511
512/**
513 * radeon_atpx_detect - detect whether we have PX
514 *
515 * Check if we have a PX system (all asics).
516 * Returns true if we have a PX system, false if not.
517 */
518static bool radeon_atpx_detect(void)
519{
520 char acpi_method_name[255] = { 0 };
521 struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
522 struct pci_dev *pdev = NULL;
523 bool has_atpx = false;
524 int vga_count = 0;
525
526 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
527 vga_count++;
528
529 has_atpx |= (radeon_atpx_pci_probe_handle(pdev) == true);
530 }
531
532 /* some newer PX laptops mark the dGPU as a non-VGA display device */
533 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_OTHER << 8, pdev)) != NULL) {
534 vga_count++;
535
536 has_atpx |= (radeon_atpx_pci_probe_handle(pdev) == true);
537 }
538
539 if (has_atpx && vga_count == 2) {
540 acpi_get_name(radeon_atpx_priv.atpx.handle, ACPI_FULL_PATHNAME, &buffer);
541 printk(KERN_INFO "vga_switcheroo: detected switching method %s handle\n",
542 acpi_method_name);
543 radeon_atpx_priv.atpx_detected = true;
544 return true;
545 }
546 return false;
547}
548
549/**
550 * radeon_register_atpx_handler - register with vga_switcheroo
551 *
552 * Register the PX callbacks with vga_switcheroo (all asics).
553 */
554void radeon_register_atpx_handler(void)
555{
556 bool r;
557 enum vga_switcheroo_handler_flags_t handler_flags = 0;
558
559 /* detect if we have any ATPX + 2 VGA in the system */
560 r = radeon_atpx_detect();
561 if (!r)
562 return;
563
564 vga_switcheroo_register_handler(&radeon_atpx_handler, handler_flags);
565}
566
567/**
568 * radeon_unregister_atpx_handler - unregister with vga_switcheroo
569 *
570 * Unregister the PX callbacks with vga_switcheroo (all asics).
571 */
572void radeon_unregister_atpx_handler(void)
573{
574 vga_switcheroo_unregister_handler();
575}
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 "radeon_acpi.h"
15
16struct radeon_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
27struct radeon_atpx {
28 acpi_handle handle;
29 struct radeon_atpx_functions functions;
30};
31
32static struct radeon_atpx_priv {
33 bool atpx_detected;
34 /* handle for device - and atpx */
35 acpi_handle dhandle;
36 acpi_handle other_handle;
37 struct radeon_atpx atpx;
38} radeon_atpx_priv;
39
40struct 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
46struct 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
52struct atpx_power_control {
53 u16 size;
54 u8 dgpu_state;
55} __packed;
56
57struct atpx_mux {
58 u16 size;
59 u16 mux;
60} __packed;
61
62bool radeon_has_atpx(void) {
63 return radeon_atpx_priv.atpx_detected;
64}
65
66/**
67 * radeon_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 */
76static union acpi_object *radeon_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 * radeon_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 */
123static void radeon_atpx_parse_functions(struct radeon_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 * radeon_atpx_validate_functions - validate ATPX functions
137 *
138 * @atpx: radeon atpx struct
139 *
140 * Validate that required functions are enabled (all asics).
141 * returns 0 on success, error on failure.
142 */
143static int radeon_atpx_validate(struct radeon_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 = radeon_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 * radeon_atpx_verify_interface - verify ATPX
190 *
191 * @atpx: radeon 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 */
198static int radeon_atpx_verify_interface(struct radeon_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 = radeon_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 radeon_atpx_parse_functions(&atpx->functions, output.function_bits);
226
227out:
228 kfree(info);
229 return err;
230}
231
232/**
233 * radeon_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 */
242static int radeon_atpx_set_discrete_state(struct radeon_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 = radeon_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 * radeon_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 */
274static int radeon_atpx_switch_disp_mux(struct radeon_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 = radeon_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 * radeon_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 */
306static int radeon_atpx_switch_i2c_mux(struct radeon_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 = radeon_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 * radeon_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 */
338static int radeon_atpx_switch_start(struct radeon_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 = radeon_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 * radeon_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 */
370static int radeon_atpx_switch_end(struct radeon_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 = radeon_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 * radeon_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 */
400static int radeon_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 radeon_atpx_switch_start(&radeon_atpx_priv.atpx, gpu_id);
410 radeon_atpx_switch_disp_mux(&radeon_atpx_priv.atpx, gpu_id);
411 radeon_atpx_switch_i2c_mux(&radeon_atpx_priv.atpx, gpu_id);
412 radeon_atpx_switch_end(&radeon_atpx_priv.atpx, gpu_id);
413
414 return 0;
415}
416
417/**
418 * radeon_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 */
427static int radeon_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 radeon_atpx_set_discrete_state(&radeon_atpx_priv.atpx, state);
435 return 0;
436}
437
438/**
439 * radeon_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 */
446static bool radeon_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 radeon_atpx_priv.other_handle = dhandle;
458 return false;
459 }
460 radeon_atpx_priv.dhandle = dhandle;
461 radeon_atpx_priv.atpx.handle = atpx_handle;
462 return true;
463}
464
465/**
466 * radeon_atpx_init - verify the ATPX interface
467 *
468 * Verify the ATPX interface (all asics).
469 * Returns 0 on success, error on failure.
470 */
471static int radeon_atpx_init(void)
472{
473 int r;
474
475 /* set up the ATPX handle */
476 r = radeon_atpx_verify_interface(&radeon_atpx_priv.atpx);
477 if (r)
478 return r;
479
480 /* validate the atpx setup */
481 r = radeon_atpx_validate(&radeon_atpx_priv.atpx);
482 if (r)
483 return r;
484
485 return 0;
486}
487
488/**
489 * radeon_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 */
496static int radeon_atpx_get_client_id(struct pci_dev *pdev)
497{
498 if (radeon_atpx_priv.dhandle == ACPI_HANDLE(&pdev->dev))
499 return VGA_SWITCHEROO_IGD;
500 else
501 return VGA_SWITCHEROO_DIS;
502}
503
504static struct vga_switcheroo_handler radeon_atpx_handler = {
505 .switchto = radeon_atpx_switchto,
506 .power_state = radeon_atpx_power_state,
507 .init = radeon_atpx_init,
508 .get_client_id = radeon_atpx_get_client_id,
509};
510
511/**
512 * radeon_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 */
517static bool radeon_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 |= (radeon_atpx_pci_probe_handle(pdev) == true);
529 }
530
531 /* some newer PX laptops mark the dGPU as a non-VGA display device */
532 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_OTHER << 8, pdev)) != NULL) {
533 vga_count++;
534
535 has_atpx |= (radeon_atpx_pci_probe_handle(pdev) == true);
536 }
537
538 if (has_atpx && vga_count == 2) {
539 acpi_get_name(radeon_atpx_priv.atpx.handle, ACPI_FULL_PATHNAME, &buffer);
540 printk(KERN_INFO "VGA switcheroo: detected switching method %s handle\n",
541 acpi_method_name);
542 radeon_atpx_priv.atpx_detected = true;
543 /*
544 * On some systems hotplug events are generated for the device
545 * being switched off when ATPX is executed. They cause ACPI
546 * hotplug to trigger and attempt to remove the device from
547 * the system, which causes it to break down. Prevent that from
548 * happening by setting the no_hotplug flag for the involved
549 * ACPI device objects.
550 */
551 acpi_bus_no_hotplug(radeon_atpx_priv.dhandle);
552 acpi_bus_no_hotplug(radeon_atpx_priv.other_handle);
553 return true;
554 }
555 return false;
556}
557
558/**
559 * radeon_register_atpx_handler - register with vga_switcheroo
560 *
561 * Register the PX callbacks with vga_switcheroo (all asics).
562 */
563void radeon_register_atpx_handler(void)
564{
565 bool r;
566
567 /* detect if we have any ATPX + 2 VGA in the system */
568 r = radeon_atpx_detect();
569 if (!r)
570 return;
571
572 vga_switcheroo_register_handler(&radeon_atpx_handler);
573}
574
575/**
576 * radeon_unregister_atpx_handler - unregister with vga_switcheroo
577 *
578 * Unregister the PX callbacks with vga_switcheroo (all asics).
579 */
580void radeon_unregister_atpx_handler(void)
581{
582 vga_switcheroo_unregister_handler();
583}