blob: fa9a9c02751ea865251f7854665c3757caa48e00 [file] [log] [blame]
Dave Airlie6a9ee8a2010-02-01 15:38:10 +10001/*
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 */
Dave Airlie6a9ee8a2010-02-01 15:38:10 +10009#include <linux/vga_switcheroo.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090010#include <linux/slab.h>
Rafael J. Wysocki7b199812013-11-11 22:41:56 +010011#include <linux/acpi.h>
Dave Airlie6a9ee8a2010-02-01 15:38:10 +100012#include <linux/pci.h>
13
Alex Deucher9e05b2f2012-07-18 13:28:52 -040014#include "radeon_acpi.h"
Dave Airlie6a9ee8a2010-02-01 15:38:10 +100015
Alex Deucher48fa4122012-08-16 14:01:57 -040016struct 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 {
Alex Deucher492b49a2012-08-16 14:07:37 -040028 acpi_handle handle;
Alex Deucher48fa4122012-08-16 14:01:57 -040029 struct radeon_atpx_functions functions;
30};
31
Dave Airlie6a9ee8a2010-02-01 15:38:10 +100032static struct radeon_atpx_priv {
33 bool atpx_detected;
34 /* handle for device - and atpx */
35 acpi_handle dhandle;
Rafael J. Wysockif244d8b2013-12-31 13:39:42 +010036 acpi_handle other_handle;
Alex Deucher48fa4122012-08-16 14:01:57 -040037 struct radeon_atpx atpx;
Dave Airlie6a9ee8a2010-02-01 15:38:10 +100038} radeon_atpx_priv;
39
Alex Deucher48fa4122012-08-16 14:01:57 -040040struct 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
Alex Deucher43a23aa2013-02-19 12:55:52 -050046struct 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
Alex Deucher492b49a2012-08-16 14:07:37 -040052struct 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
Dave Airlie10ebc0b2012-09-17 14:40:31 +100062bool radeon_is_px(void) {
63 return radeon_atpx_priv.atpx_detected;
64}
65
Alex Deucher48fa4122012-08-16 14:01:57 -040066/**
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)
Dave Airlie6a9ee8a2010-02-01 15:38:10 +100078{
79 acpi_status status;
Alex Deucher48fa4122012-08-16 14:01:57 -040080 union acpi_object atpx_arg_elements[2];
Dave Airlie6a9ee8a2010-02-01 15:38:10 +100081 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;
Alex Deucher48fa4122012-08-16 14:01:57 -040088 atpx_arg_elements[0].integer.value = function;
Dave Airlie6a9ee8a2010-02-01 15:38:10 +100089
Alex Deucher48fa4122012-08-16 14:01:57 -040090 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;
Dave Airlie6a9ee8a2010-02-01 15:38:10 +100098 }
Alex Deucher48fa4122012-08-16 14:01:57 -040099
Alex Deucher0b903652012-10-23 17:57:54 -0400100 status = acpi_evaluate_object(handle, NULL, &atpx_arg, &buffer);
Alex Deucher48fa4122012-08-16 14:01:57 -0400101
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/**
Alex Deucher43a23aa2013-02-19 12:55:52 -0500136 * 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/**
Alex Deucher48fa4122012-08-16 14:01:57 -0400189 * radeon_atpx_verify_interface - verify ATPX
190 *
Alex Deucher48fa4122012-08-16 14:01:57 -0400191 * @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 */
Alex Deucher492b49a2012-08-16 14:07:37 -0400198static int radeon_atpx_verify_interface(struct radeon_atpx *atpx)
Alex Deucher48fa4122012-08-16 14:01:57 -0400199{
200 union acpi_object *info;
201 struct atpx_verify_interface output;
202 size_t size;
203 int err = 0;
204
Alex Deucher492b49a2012-08-16 14:07:37 -0400205 info = radeon_atpx_call(atpx->handle, ATPX_FUNCTION_VERIFY_INTERFACE, NULL);
Alex Deucher48fa4122012-08-16 14:01:57 -0400206 if (!info)
207 return -EIO;
208
209 memset(&output, 0, sizeof(output));
210
211 size = *(u16 *) info->buffer.pointer;
212 if (size < 8) {
Randy Dunlapbd6126b2012-10-16 10:15:45 +1000213 printk("ATPX buffer is too small: %zu\n", size);
Alex Deucher48fa4122012-08-16 14:01:57 -0400214 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? */
Alex Deucher9f050c72014-02-20 09:16:01 -0500222 printk("ATPX version %u, functions 0x%08x\n",
223 output.version, output.function_bits);
Alex Deucher48fa4122012-08-16 14:01:57 -0400224
225 radeon_atpx_parse_functions(&atpx->functions, output.function_bits);
226
227out:
228 kfree(info);
229 return err;
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000230}
231
Alex Deucher82e02932012-08-16 14:09:21 -0400232/**
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 */
Alex Deucher492b49a2012-08-16 14:07:37 -0400242static int radeon_atpx_set_discrete_state(struct radeon_atpx *atpx, u8 state)
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000243{
Alex Deucher492b49a2012-08-16 14:07:37 -0400244 struct acpi_buffer params;
245 union acpi_object *info;
246 struct atpx_power_control input;
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000247
Alex Deucher492b49a2012-08-16 14:07:37 -0400248 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 &params);
256 if (!info)
257 return -EIO;
258 kfree(info);
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000259 }
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000260 return 0;
261}
262
Alex Deucher82e02932012-08-16 14:09:21 -0400263/**
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 */
Alex Deucher492b49a2012-08-16 14:07:37 -0400274static int radeon_atpx_switch_disp_mux(struct radeon_atpx *atpx, u16 mux_id)
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000275{
Alex Deucher492b49a2012-08-16 14:07:37 -0400276 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 &params);
288 if (!info)
289 return -EIO;
290 kfree(info);
291 }
292 return 0;
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000293}
294
Alex Deucher82e02932012-08-16 14:09:21 -0400295/**
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 */
Alex Deucher492b49a2012-08-16 14:07:37 -0400306static int radeon_atpx_switch_i2c_mux(struct radeon_atpx *atpx, u16 mux_id)
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000307{
Alex Deucher492b49a2012-08-16 14:07:37 -0400308 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 &params);
320 if (!info)
321 return -EIO;
322 kfree(info);
323 }
324 return 0;
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000325}
326
Alex Deucher82e02932012-08-16 14:09:21 -0400327/**
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 */
Alex Deucher492b49a2012-08-16 14:07:37 -0400338static int radeon_atpx_switch_start(struct radeon_atpx *atpx, u16 mux_id)
Alex Deucher58e73812011-05-06 01:42:49 -0400339{
Alex Deucher492b49a2012-08-16 14:07:37 -0400340 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 &params);
352 if (!info)
353 return -EIO;
354 kfree(info);
355 }
356 return 0;
Alex Deucher58e73812011-05-06 01:42:49 -0400357}
358
Alex Deucher82e02932012-08-16 14:09:21 -0400359/**
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 */
Alex Deucher492b49a2012-08-16 14:07:37 -0400370static int radeon_atpx_switch_end(struct radeon_atpx *atpx, u16 mux_id)
Alex Deucher58e73812011-05-06 01:42:49 -0400371{
Alex Deucher492b49a2012-08-16 14:07:37 -0400372 struct acpi_buffer params;
373 union acpi_object *info;
374 struct atpx_mux input;
Alex Deucher58e73812011-05-06 01:42:49 -0400375
Alex Deucher492b49a2012-08-16 14:07:37 -0400376 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 &params);
384 if (!info)
385 return -EIO;
386 kfree(info);
387 }
388 return 0;
Alex Deucher58e73812011-05-06 01:42:49 -0400389}
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000390
Alex Deucher82e02932012-08-16 14:09:21 -0400391/**
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 */
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000400static int radeon_atpx_switchto(enum vga_switcheroo_client_id id)
401{
Alex Deucher492b49a2012-08-16 14:07:37 -0400402 u16 gpu_id;
Alex Deucher58e73812011-05-06 01:42:49 -0400403
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000404 if (id == VGA_SWITCHEROO_IGD)
Alex Deucher9e05b2f2012-07-18 13:28:52 -0400405 gpu_id = ATPX_INTEGRATED_GPU;
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000406 else
Alex Deucher9e05b2f2012-07-18 13:28:52 -0400407 gpu_id = ATPX_DISCRETE_GPU;
Alex Deucher58e73812011-05-06 01:42:49 -0400408
Alex Deucher492b49a2012-08-16 14:07:37 -0400409 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);
Alex Deucher58e73812011-05-06 01:42:49 -0400413
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000414 return 0;
415}
416
Alex Deucher82e02932012-08-16 14:09:21 -0400417/**
Igor Murzovdfdcbeb2012-10-25 17:09:00 +0400418 * radeon_atpx_power_state - power down/up the requested GPU
Alex Deucher82e02932012-08-16 14:09:21 -0400419 *
Igor Murzovdfdcbeb2012-10-25 17:09:00 +0400420 * @id: GPU to power down/up
Alex Deucher82e02932012-08-16 14:09:21 -0400421 * @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 */
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000427static 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
Alex Deucher492b49a2012-08-16 14:07:37 -0400434 radeon_atpx_set_discrete_state(&radeon_atpx_priv.atpx, state);
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000435 return 0;
436}
437
Alex Deucher82e02932012-08-16 14:09:21 -0400438/**
Alex Deucherc9bd7732012-10-23 12:42:42 -0400439 * radeon_atpx_pci_probe_handle - look up the ATPX handle
Alex Deucher82e02932012-08-16 14:09:21 -0400440 *
441 * @pdev: pci device
442 *
Alex Deucherc9bd7732012-10-23 12:42:42 -0400443 * Look up the ATPX handles (all asics).
Alex Deucher82e02932012-08-16 14:09:21 -0400444 * Returns true if the handles are found, false if not.
445 */
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000446static bool radeon_atpx_pci_probe_handle(struct pci_dev *pdev)
447{
Alex Deucherc61e2772012-08-16 15:39:09 -0400448 acpi_handle dhandle, atpx_handle;
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000449 acpi_status status;
450
Rafael J. Wysocki3a83f992013-11-14 23:17:21 +0100451 dhandle = ACPI_HANDLE(&pdev->dev);
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000452 if (!dhandle)
453 return false;
454
455 status = acpi_get_handle(dhandle, "ATPX", &atpx_handle);
Rafael J. Wysockif244d8b2013-12-31 13:39:42 +0100456 if (ACPI_FAILURE(status)) {
457 radeon_atpx_priv.other_handle = dhandle;
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000458 return false;
Rafael J. Wysockif244d8b2013-12-31 13:39:42 +0100459 }
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000460 radeon_atpx_priv.dhandle = dhandle;
Alex Deucher492b49a2012-08-16 14:07:37 -0400461 radeon_atpx_priv.atpx.handle = atpx_handle;
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000462 return true;
463}
464
Alex Deucher82e02932012-08-16 14:09:21 -0400465/**
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 */
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000471static int radeon_atpx_init(void)
472{
Alex Deucher43a23aa2013-02-19 12:55:52 -0500473 int r;
474
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000475 /* set up the ATPX handle */
Alex Deucher43a23aa2013-02-19 12:55:52 -0500476 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;
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000486}
487
Alex Deucher82e02932012-08-16 14:09:21 -0400488/**
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 */
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000496static int radeon_atpx_get_client_id(struct pci_dev *pdev)
497{
Rafael J. Wysocki3a83f992013-11-14 23:17:21 +0100498 if (radeon_atpx_priv.dhandle == ACPI_HANDLE(&pdev->dev))
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000499 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
Alex Deucher82e02932012-08-16 14:09:21 -0400511/**
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 */
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000517static 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 if (has_atpx && vga_count == 2) {
Alex Deucher492b49a2012-08-16 14:07:37 -0400532 acpi_get_name(radeon_atpx_priv.atpx.handle, ACPI_FULL_PATHNAME, &buffer);
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000533 printk(KERN_INFO "VGA switcheroo: detected switching method %s handle\n",
534 acpi_method_name);
535 radeon_atpx_priv.atpx_detected = true;
Rafael J. Wysockif244d8b2013-12-31 13:39:42 +0100536 /*
537 * On some systems hotplug events are generated for the device
538 * being switched off when ATPX is executed. They cause ACPI
539 * hotplug to trigger and attempt to remove the device from
540 * the system, which causes it to break down. Prevent that from
541 * happening by setting the no_hotplug flag for the involved
542 * ACPI device objects.
543 */
544 acpi_bus_no_hotplug(radeon_atpx_priv.dhandle);
545 acpi_bus_no_hotplug(radeon_atpx_priv.other_handle);
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000546 return true;
547 }
548 return false;
549}
550
Alex Deucher82e02932012-08-16 14:09:21 -0400551/**
552 * radeon_register_atpx_handler - register with vga_switcheroo
553 *
554 * Register the PX callbacks with vga_switcheroo (all asics).
555 */
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000556void radeon_register_atpx_handler(void)
557{
558 bool r;
559
560 /* detect if we have any ATPX + 2 VGA in the system */
561 r = radeon_atpx_detect();
562 if (!r)
563 return;
564
565 vga_switcheroo_register_handler(&radeon_atpx_handler);
566}
567
Alex Deucher82e02932012-08-16 14:09:21 -0400568/**
569 * radeon_unregister_atpx_handler - unregister with vga_switcheroo
570 *
571 * Unregister the PX callbacks with vga_switcheroo (all asics).
572 */
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000573void radeon_unregister_atpx_handler(void)
574{
575 vga_switcheroo_unregister_handler();
576}