2 * Copyright (c) 2010 Red Hat Inc.
3 * Author : Dave Airlie <airlied@redhat.com>
7 * ATPX support for both Intel/ATI
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>
15 #include "radeon_acpi.h"
17 struct radeon_atpx_functions {
24 bool disp_connectors_mapping;
25 bool disp_detetion_ports;
30 struct radeon_atpx_functions functions;
34 static struct radeon_atpx_priv {
36 /* handle for device - and atpx */
38 struct radeon_atpx atpx;
41 struct atpx_verify_interface {
42 u16 size; /* structure size in bytes (includes size field) */
43 u16 version; /* version */
44 u32 function_bits; /* supported functions bit vector */
47 struct atpx_px_params {
48 u16 size; /* structure size in bytes (includes size field) */
49 u32 valid_flags; /* which flags are valid */
50 u32 flags; /* flags */
53 struct atpx_power_control {
63 bool radeon_has_atpx(void) {
64 return radeon_atpx_priv.atpx_detected;
67 bool radeon_has_atpx_dgpu_power_cntl(void) {
68 return radeon_atpx_priv.atpx.functions.power_cntl;
71 bool radeon_is_atpx_hybrid(void) {
72 return radeon_atpx_priv.atpx.is_hybrid;
76 * radeon_atpx_call - call an ATPX method
78 * @handle: acpi handle
79 * @function: the ATPX function to execute
80 * @params: ATPX function params
82 * Executes the requested ATPX function (all asics).
83 * Returns a pointer to the acpi output buffer.
85 static union acpi_object *radeon_atpx_call(acpi_handle handle, int function,
86 struct acpi_buffer *params)
89 union acpi_object atpx_arg_elements[2];
90 struct acpi_object_list atpx_arg;
91 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
94 atpx_arg.pointer = &atpx_arg_elements[0];
96 atpx_arg_elements[0].type = ACPI_TYPE_INTEGER;
97 atpx_arg_elements[0].integer.value = function;
100 atpx_arg_elements[1].type = ACPI_TYPE_BUFFER;
101 atpx_arg_elements[1].buffer.length = params->length;
102 atpx_arg_elements[1].buffer.pointer = params->pointer;
104 /* We need a second fake parameter */
105 atpx_arg_elements[1].type = ACPI_TYPE_INTEGER;
106 atpx_arg_elements[1].integer.value = 0;
109 status = acpi_evaluate_object(handle, NULL, &atpx_arg, &buffer);
111 /* Fail only if calling the method fails and ATPX is supported */
112 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
113 printk("failed to evaluate ATPX got %s\n",
114 acpi_format_exception(status));
115 kfree(buffer.pointer);
119 return buffer.pointer;
123 * radeon_atpx_parse_functions - parse supported functions
125 * @f: supported functions struct
126 * @mask: supported functions mask from ATPX
128 * Use the supported functions mask from ATPX function
129 * ATPX_FUNCTION_VERIFY_INTERFACE to determine what functions
130 * are supported (all asics).
132 static void radeon_atpx_parse_functions(struct radeon_atpx_functions *f, u32 mask)
134 f->px_params = mask & ATPX_GET_PX_PARAMETERS_SUPPORTED;
135 f->power_cntl = mask & ATPX_POWER_CONTROL_SUPPORTED;
136 f->disp_mux_cntl = mask & ATPX_DISPLAY_MUX_CONTROL_SUPPORTED;
137 f->i2c_mux_cntl = mask & ATPX_I2C_MUX_CONTROL_SUPPORTED;
138 f->switch_start = mask & ATPX_GRAPHICS_DEVICE_SWITCH_START_NOTIFICATION_SUPPORTED;
139 f->switch_end = mask & ATPX_GRAPHICS_DEVICE_SWITCH_END_NOTIFICATION_SUPPORTED;
140 f->disp_connectors_mapping = mask & ATPX_GET_DISPLAY_CONNECTORS_MAPPING_SUPPORTED;
141 f->disp_detetion_ports = mask & ATPX_GET_DISPLAY_DETECTION_PORTS_SUPPORTED;
145 * radeon_atpx_validate_functions - validate ATPX functions
147 * @atpx: radeon atpx struct
149 * Validate that required functions are enabled (all asics).
150 * returns 0 on success, error on failure.
152 static int radeon_atpx_validate(struct radeon_atpx *atpx)
156 if (atpx->functions.px_params) {
157 union acpi_object *info;
158 struct atpx_px_params output;
161 info = radeon_atpx_call(atpx->handle, ATPX_FUNCTION_GET_PX_PARAMETERS, NULL);
165 memset(&output, 0, sizeof(output));
167 size = *(u16 *) info->buffer.pointer;
169 printk("ATPX buffer is too small: %zu\n", size);
173 size = min(sizeof(output), size);
175 memcpy(&output, info->buffer.pointer, size);
177 valid_bits = output.flags & output.valid_flags;
182 /* if separate mux flag is set, mux controls are required */
183 if (valid_bits & ATPX_SEPARATE_MUX_FOR_I2C) {
184 atpx->functions.i2c_mux_cntl = true;
185 atpx->functions.disp_mux_cntl = true;
187 /* if any outputs are muxed, mux controls are required */
188 if (valid_bits & (ATPX_CRT1_RGB_SIGNAL_MUXED |
189 ATPX_TV_SIGNAL_MUXED |
190 ATPX_DFP_SIGNAL_MUXED))
191 atpx->functions.disp_mux_cntl = true;
193 /* some bioses set these bits rather than flagging power_cntl as supported */
194 if (valid_bits & (ATPX_DYNAMIC_PX_SUPPORTED |
195 ATPX_DYNAMIC_DGPU_POWER_OFF_SUPPORTED))
196 atpx->functions.power_cntl = true;
198 atpx->is_hybrid = false;
199 if (valid_bits & ATPX_MS_HYBRID_GFX_SUPPORTED) {
200 printk("ATPX Hybrid Graphics\n");
202 /* This is a temporary hack until the D3 cold support
203 * makes it upstream. The ATPX power_control method seems
204 * to still work on even if the system should be using
205 * the new standardized hybrid D3 cold ACPI interface.
207 atpx->functions.power_cntl = true;
209 atpx->functions.power_cntl = false;
211 atpx->is_hybrid = true;
218 * radeon_atpx_verify_interface - verify ATPX
220 * @atpx: radeon atpx struct
222 * Execute the ATPX_FUNCTION_VERIFY_INTERFACE ATPX function
223 * to initialize ATPX and determine what features are supported
225 * returns 0 on success, error on failure.
227 static int radeon_atpx_verify_interface(struct radeon_atpx *atpx)
229 union acpi_object *info;
230 struct atpx_verify_interface output;
234 info = radeon_atpx_call(atpx->handle, ATPX_FUNCTION_VERIFY_INTERFACE, NULL);
238 memset(&output, 0, sizeof(output));
240 size = *(u16 *) info->buffer.pointer;
242 printk("ATPX buffer is too small: %zu\n", size);
246 size = min(sizeof(output), size);
248 memcpy(&output, info->buffer.pointer, size);
250 /* TODO: check version? */
251 printk("ATPX version %u, functions 0x%08x\n",
252 output.version, output.function_bits);
254 radeon_atpx_parse_functions(&atpx->functions, output.function_bits);
262 * radeon_atpx_set_discrete_state - power up/down discrete GPU
264 * @atpx: atpx info struct
265 * @state: discrete GPU state (0 = power down, 1 = power up)
267 * Execute the ATPX_FUNCTION_POWER_CONTROL ATPX function to
268 * power down/up the discrete GPU (all asics).
269 * Returns 0 on success, error on failure.
271 static int radeon_atpx_set_discrete_state(struct radeon_atpx *atpx, u8 state)
273 struct acpi_buffer params;
274 union acpi_object *info;
275 struct atpx_power_control input;
277 if (atpx->functions.power_cntl) {
279 input.dgpu_state = state;
280 params.length = input.size;
281 params.pointer = &input;
282 info = radeon_atpx_call(atpx->handle,
283 ATPX_FUNCTION_POWER_CONTROL,
289 /* 200ms delay is required after off */
297 * radeon_atpx_switch_disp_mux - switch display mux
299 * @atpx: atpx info struct
300 * @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU)
302 * Execute the ATPX_FUNCTION_DISPLAY_MUX_CONTROL ATPX function to
303 * switch the display mux between the discrete GPU and integrated GPU
305 * Returns 0 on success, error on failure.
307 static int radeon_atpx_switch_disp_mux(struct radeon_atpx *atpx, u16 mux_id)
309 struct acpi_buffer params;
310 union acpi_object *info;
311 struct atpx_mux input;
313 if (atpx->functions.disp_mux_cntl) {
316 params.length = input.size;
317 params.pointer = &input;
318 info = radeon_atpx_call(atpx->handle,
319 ATPX_FUNCTION_DISPLAY_MUX_CONTROL,
329 * radeon_atpx_switch_i2c_mux - switch i2c/hpd mux
331 * @atpx: atpx info struct
332 * @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU)
334 * Execute the ATPX_FUNCTION_I2C_MUX_CONTROL ATPX function to
335 * switch the i2c/hpd mux between the discrete GPU and integrated GPU
337 * Returns 0 on success, error on failure.
339 static int radeon_atpx_switch_i2c_mux(struct radeon_atpx *atpx, u16 mux_id)
341 struct acpi_buffer params;
342 union acpi_object *info;
343 struct atpx_mux input;
345 if (atpx->functions.i2c_mux_cntl) {
348 params.length = input.size;
349 params.pointer = &input;
350 info = radeon_atpx_call(atpx->handle,
351 ATPX_FUNCTION_I2C_MUX_CONTROL,
361 * radeon_atpx_switch_start - notify the sbios of a GPU switch
363 * @atpx: atpx info struct
364 * @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU)
366 * Execute the ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_START_NOTIFICATION ATPX
367 * function to notify the sbios that a switch between the discrete GPU and
368 * integrated GPU has begun (all asics).
369 * Returns 0 on success, error on failure.
371 static int radeon_atpx_switch_start(struct radeon_atpx *atpx, u16 mux_id)
373 struct acpi_buffer params;
374 union acpi_object *info;
375 struct atpx_mux input;
377 if (atpx->functions.switch_start) {
380 params.length = input.size;
381 params.pointer = &input;
382 info = radeon_atpx_call(atpx->handle,
383 ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_START_NOTIFICATION,
393 * radeon_atpx_switch_end - notify the sbios of a GPU switch
395 * @atpx: atpx info struct
396 * @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU)
398 * Execute the ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_END_NOTIFICATION ATPX
399 * function to notify the sbios that a switch between the discrete GPU and
400 * integrated GPU has ended (all asics).
401 * Returns 0 on success, error on failure.
403 static int radeon_atpx_switch_end(struct radeon_atpx *atpx, u16 mux_id)
405 struct acpi_buffer params;
406 union acpi_object *info;
407 struct atpx_mux input;
409 if (atpx->functions.switch_end) {
412 params.length = input.size;
413 params.pointer = &input;
414 info = radeon_atpx_call(atpx->handle,
415 ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_END_NOTIFICATION,
425 * radeon_atpx_switchto - switch to the requested GPU
427 * @id: GPU to switch to
429 * Execute the necessary ATPX functions to switch between the discrete GPU and
430 * integrated GPU (all asics).
431 * Returns 0 on success, error on failure.
433 static int radeon_atpx_switchto(enum vga_switcheroo_client_id id)
437 if (id == VGA_SWITCHEROO_IGD)
438 gpu_id = ATPX_INTEGRATED_GPU;
440 gpu_id = ATPX_DISCRETE_GPU;
442 radeon_atpx_switch_start(&radeon_atpx_priv.atpx, gpu_id);
443 radeon_atpx_switch_disp_mux(&radeon_atpx_priv.atpx, gpu_id);
444 radeon_atpx_switch_i2c_mux(&radeon_atpx_priv.atpx, gpu_id);
445 radeon_atpx_switch_end(&radeon_atpx_priv.atpx, gpu_id);
451 * radeon_atpx_power_state - power down/up the requested GPU
453 * @id: GPU to power down/up
454 * @state: requested power state (0 = off, 1 = on)
456 * Execute the necessary ATPX function to power down/up the discrete GPU
458 * Returns 0 on success, error on failure.
460 static int radeon_atpx_power_state(enum vga_switcheroo_client_id id,
461 enum vga_switcheroo_state state)
463 /* on w500 ACPI can't change intel gpu state */
464 if (id == VGA_SWITCHEROO_IGD)
467 radeon_atpx_set_discrete_state(&radeon_atpx_priv.atpx, state);
472 * radeon_atpx_pci_probe_handle - look up the ATPX handle
476 * Look up the ATPX handles (all asics).
477 * Returns true if the handles are found, false if not.
479 static bool radeon_atpx_pci_probe_handle(struct pci_dev *pdev)
481 acpi_handle dhandle, atpx_handle;
484 dhandle = ACPI_HANDLE(&pdev->dev);
488 status = acpi_get_handle(dhandle, "ATPX", &atpx_handle);
489 if (ACPI_FAILURE(status))
492 radeon_atpx_priv.dhandle = dhandle;
493 radeon_atpx_priv.atpx.handle = atpx_handle;
498 * radeon_atpx_init - verify the ATPX interface
500 * Verify the ATPX interface (all asics).
501 * Returns 0 on success, error on failure.
503 static int radeon_atpx_init(void)
507 /* set up the ATPX handle */
508 r = radeon_atpx_verify_interface(&radeon_atpx_priv.atpx);
512 /* validate the atpx setup */
513 r = radeon_atpx_validate(&radeon_atpx_priv.atpx);
521 * radeon_atpx_get_client_id - get the client id
525 * look up whether we are the integrated or discrete GPU (all asics).
526 * Returns the client id.
528 static int radeon_atpx_get_client_id(struct pci_dev *pdev)
530 if (radeon_atpx_priv.dhandle == ACPI_HANDLE(&pdev->dev))
531 return VGA_SWITCHEROO_IGD;
533 return VGA_SWITCHEROO_DIS;
536 static const struct vga_switcheroo_handler radeon_atpx_handler = {
537 .switchto = radeon_atpx_switchto,
538 .power_state = radeon_atpx_power_state,
539 .get_client_id = radeon_atpx_get_client_id,
543 * radeon_atpx_detect - detect whether we have PX
545 * Check if we have a PX system (all asics).
546 * Returns true if we have a PX system, false if not.
548 static bool radeon_atpx_detect(void)
550 char acpi_method_name[255] = { 0 };
551 struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
552 struct pci_dev *pdev = NULL;
553 bool has_atpx = false;
556 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
559 has_atpx |= (radeon_atpx_pci_probe_handle(pdev) == true);
562 /* some newer PX laptops mark the dGPU as a non-VGA display device */
563 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_OTHER << 8, pdev)) != NULL) {
566 has_atpx |= (radeon_atpx_pci_probe_handle(pdev) == true);
569 if (has_atpx && vga_count == 2) {
570 acpi_get_name(radeon_atpx_priv.atpx.handle, ACPI_FULL_PATHNAME, &buffer);
571 printk(KERN_INFO "vga_switcheroo: detected switching method %s handle\n",
573 radeon_atpx_priv.atpx_detected = true;
581 * radeon_register_atpx_handler - register with vga_switcheroo
583 * Register the PX callbacks with vga_switcheroo (all asics).
585 void radeon_register_atpx_handler(void)
588 enum vga_switcheroo_handler_flags_t handler_flags = 0;
590 /* detect if we have any ATPX + 2 VGA in the system */
591 r = radeon_atpx_detect();
595 vga_switcheroo_register_handler(&radeon_atpx_handler, handler_flags);
599 * radeon_unregister_atpx_handler - unregister with vga_switcheroo
601 * Unregister the PX callbacks with vga_switcheroo (all asics).
603 void radeon_unregister_atpx_handler(void)
605 vga_switcheroo_unregister_handler();