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 <acpi/acpi.h>
12 #include <acpi/acpi_bus.h>
13 #include <linux/pci.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;
33 static struct radeon_atpx_priv {
35 /* handle for device - and atpx */
37 struct radeon_atpx atpx;
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 */
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 */
52 struct atpx_power_control {
63 * radeon_atpx_call - call an ATPX method
65 * @handle: acpi handle
66 * @function: the ATPX function to execute
67 * @params: ATPX function params
69 * Executes the requested ATPX function (all asics).
70 * Returns a pointer to the acpi output buffer.
72 static union acpi_object *radeon_atpx_call(acpi_handle handle, int function,
73 struct acpi_buffer *params)
76 union acpi_object atpx_arg_elements[2];
77 struct acpi_object_list atpx_arg;
78 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
81 atpx_arg.pointer = &atpx_arg_elements[0];
83 atpx_arg_elements[0].type = ACPI_TYPE_INTEGER;
84 atpx_arg_elements[0].integer.value = function;
87 atpx_arg_elements[1].type = ACPI_TYPE_BUFFER;
88 atpx_arg_elements[1].buffer.length = params->length;
89 atpx_arg_elements[1].buffer.pointer = params->pointer;
91 /* We need a second fake parameter */
92 atpx_arg_elements[1].type = ACPI_TYPE_INTEGER;
93 atpx_arg_elements[1].integer.value = 0;
96 status = acpi_evaluate_object(handle, NULL, &atpx_arg, &buffer);
98 /* Fail only if calling the method fails and ATPX is supported */
99 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
100 printk("failed to evaluate ATPX got %s\n",
101 acpi_format_exception(status));
102 kfree(buffer.pointer);
106 return buffer.pointer;
110 * radeon_atpx_parse_functions - parse supported functions
112 * @f: supported functions struct
113 * @mask: supported functions mask from ATPX
115 * Use the supported functions mask from ATPX function
116 * ATPX_FUNCTION_VERIFY_INTERFACE to determine what functions
117 * are supported (all asics).
119 static void radeon_atpx_parse_functions(struct radeon_atpx_functions *f, u32 mask)
121 f->px_params = mask & ATPX_GET_PX_PARAMETERS_SUPPORTED;
122 f->power_cntl = mask & ATPX_POWER_CONTROL_SUPPORTED;
123 f->disp_mux_cntl = mask & ATPX_DISPLAY_MUX_CONTROL_SUPPORTED;
124 f->i2c_mux_cntl = mask & ATPX_I2C_MUX_CONTROL_SUPPORTED;
125 f->switch_start = mask & ATPX_GRAPHICS_DEVICE_SWITCH_START_NOTIFICATION_SUPPORTED;
126 f->switch_end = mask & ATPX_GRAPHICS_DEVICE_SWITCH_END_NOTIFICATION_SUPPORTED;
127 f->disp_connectors_mapping = mask & ATPX_GET_DISPLAY_CONNECTORS_MAPPING_SUPPORTED;
128 f->disp_detetion_ports = mask & ATPX_GET_DISPLAY_DETECTION_PORTS_SUPPORTED;
132 * radeon_atpx_validate_functions - validate ATPX functions
134 * @atpx: radeon atpx struct
136 * Validate that required functions are enabled (all asics).
137 * returns 0 on success, error on failure.
139 static int radeon_atpx_validate(struct radeon_atpx *atpx)
141 /* make sure required functions are enabled */
142 /* dGPU power control is required */
143 atpx->functions.power_cntl = true;
145 if (atpx->functions.px_params) {
146 union acpi_object *info;
147 struct atpx_px_params output;
151 info = radeon_atpx_call(atpx->handle, ATPX_FUNCTION_GET_PX_PARAMETERS, NULL);
155 memset(&output, 0, sizeof(output));
157 size = *(u16 *) info->buffer.pointer;
159 printk("ATPX buffer is too small: %zu\n", size);
163 size = min(sizeof(output), size);
165 memcpy(&output, info->buffer.pointer, size);
167 valid_bits = output.flags & output.valid_flags;
168 /* if separate mux flag is set, mux controls are required */
169 if (valid_bits & ATPX_SEPARATE_MUX_FOR_I2C) {
170 atpx->functions.i2c_mux_cntl = true;
171 atpx->functions.disp_mux_cntl = true;
173 /* if any outputs are muxed, mux controls are required */
174 if (valid_bits & (ATPX_CRT1_RGB_SIGNAL_MUXED |
175 ATPX_TV_SIGNAL_MUXED |
176 ATPX_DFP_SIGNAL_MUXED))
177 atpx->functions.disp_mux_cntl = true;
185 * radeon_atpx_verify_interface - verify ATPX
187 * @atpx: radeon atpx struct
189 * Execute the ATPX_FUNCTION_VERIFY_INTERFACE ATPX function
190 * to initialize ATPX and determine what features are supported
192 * returns 0 on success, error on failure.
194 static int radeon_atpx_verify_interface(struct radeon_atpx *atpx)
196 union acpi_object *info;
197 struct atpx_verify_interface output;
201 info = radeon_atpx_call(atpx->handle, ATPX_FUNCTION_VERIFY_INTERFACE, NULL);
205 memset(&output, 0, sizeof(output));
207 size = *(u16 *) info->buffer.pointer;
209 printk("ATPX buffer is too small: %zu\n", size);
213 size = min(sizeof(output), size);
215 memcpy(&output, info->buffer.pointer, size);
217 /* TODO: check version? */
218 printk("ATPX version %u\n", output.version);
220 radeon_atpx_parse_functions(&atpx->functions, output.function_bits);
228 * radeon_atpx_set_discrete_state - power up/down discrete GPU
230 * @atpx: atpx info struct
231 * @state: discrete GPU state (0 = power down, 1 = power up)
233 * Execute the ATPX_FUNCTION_POWER_CONTROL ATPX function to
234 * power down/up the discrete GPU (all asics).
235 * Returns 0 on success, error on failure.
237 static int radeon_atpx_set_discrete_state(struct radeon_atpx *atpx, u8 state)
239 struct acpi_buffer params;
240 union acpi_object *info;
241 struct atpx_power_control input;
243 if (atpx->functions.power_cntl) {
245 input.dgpu_state = state;
246 params.length = input.size;
247 params.pointer = &input;
248 info = radeon_atpx_call(atpx->handle,
249 ATPX_FUNCTION_POWER_CONTROL,
259 * radeon_atpx_switch_disp_mux - switch display mux
261 * @atpx: atpx info struct
262 * @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU)
264 * Execute the ATPX_FUNCTION_DISPLAY_MUX_CONTROL ATPX function to
265 * switch the display mux between the discrete GPU and integrated GPU
267 * Returns 0 on success, error on failure.
269 static int radeon_atpx_switch_disp_mux(struct radeon_atpx *atpx, u16 mux_id)
271 struct acpi_buffer params;
272 union acpi_object *info;
273 struct atpx_mux input;
275 if (atpx->functions.disp_mux_cntl) {
278 params.length = input.size;
279 params.pointer = &input;
280 info = radeon_atpx_call(atpx->handle,
281 ATPX_FUNCTION_DISPLAY_MUX_CONTROL,
291 * radeon_atpx_switch_i2c_mux - switch i2c/hpd mux
293 * @atpx: atpx info struct
294 * @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU)
296 * Execute the ATPX_FUNCTION_I2C_MUX_CONTROL ATPX function to
297 * switch the i2c/hpd mux between the discrete GPU and integrated GPU
299 * Returns 0 on success, error on failure.
301 static int radeon_atpx_switch_i2c_mux(struct radeon_atpx *atpx, u16 mux_id)
303 struct acpi_buffer params;
304 union acpi_object *info;
305 struct atpx_mux input;
307 if (atpx->functions.i2c_mux_cntl) {
310 params.length = input.size;
311 params.pointer = &input;
312 info = radeon_atpx_call(atpx->handle,
313 ATPX_FUNCTION_I2C_MUX_CONTROL,
323 * radeon_atpx_switch_start - notify the sbios of a GPU switch
325 * @atpx: atpx info struct
326 * @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU)
328 * Execute the ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_START_NOTIFICATION ATPX
329 * function to notify the sbios that a switch between the discrete GPU and
330 * integrated GPU has begun (all asics).
331 * Returns 0 on success, error on failure.
333 static int radeon_atpx_switch_start(struct radeon_atpx *atpx, u16 mux_id)
335 struct acpi_buffer params;
336 union acpi_object *info;
337 struct atpx_mux input;
339 if (atpx->functions.switch_start) {
342 params.length = input.size;
343 params.pointer = &input;
344 info = radeon_atpx_call(atpx->handle,
345 ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_START_NOTIFICATION,
355 * radeon_atpx_switch_end - notify the sbios of a GPU switch
357 * @atpx: atpx info struct
358 * @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU)
360 * Execute the ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_END_NOTIFICATION ATPX
361 * function to notify the sbios that a switch between the discrete GPU and
362 * integrated GPU has ended (all asics).
363 * Returns 0 on success, error on failure.
365 static int radeon_atpx_switch_end(struct radeon_atpx *atpx, u16 mux_id)
367 struct acpi_buffer params;
368 union acpi_object *info;
369 struct atpx_mux input;
371 if (atpx->functions.switch_end) {
374 params.length = input.size;
375 params.pointer = &input;
376 info = radeon_atpx_call(atpx->handle,
377 ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_END_NOTIFICATION,
387 * radeon_atpx_switchto - switch to the requested GPU
389 * @id: GPU to switch to
391 * Execute the necessary ATPX functions to switch between the discrete GPU and
392 * integrated GPU (all asics).
393 * Returns 0 on success, error on failure.
395 static int radeon_atpx_switchto(enum vga_switcheroo_client_id id)
399 if (id == VGA_SWITCHEROO_IGD)
400 gpu_id = ATPX_INTEGRATED_GPU;
402 gpu_id = ATPX_DISCRETE_GPU;
404 radeon_atpx_switch_start(&radeon_atpx_priv.atpx, gpu_id);
405 radeon_atpx_switch_disp_mux(&radeon_atpx_priv.atpx, gpu_id);
406 radeon_atpx_switch_i2c_mux(&radeon_atpx_priv.atpx, gpu_id);
407 radeon_atpx_switch_end(&radeon_atpx_priv.atpx, gpu_id);
413 * radeon_atpx_power_state - power down/up the requested GPU
415 * @id: GPU to power down/up
416 * @state: requested power state (0 = off, 1 = on)
418 * Execute the necessary ATPX function to power down/up the discrete GPU
420 * Returns 0 on success, error on failure.
422 static int radeon_atpx_power_state(enum vga_switcheroo_client_id id,
423 enum vga_switcheroo_state state)
425 /* on w500 ACPI can't change intel gpu state */
426 if (id == VGA_SWITCHEROO_IGD)
429 radeon_atpx_set_discrete_state(&radeon_atpx_priv.atpx, state);
434 * radeon_atpx_pci_probe_handle - look up the ATPX handle
438 * Look up the ATPX handles (all asics).
439 * Returns true if the handles are found, false if not.
441 static bool radeon_atpx_pci_probe_handle(struct pci_dev *pdev)
443 acpi_handle dhandle, atpx_handle;
446 dhandle = DEVICE_ACPI_HANDLE(&pdev->dev);
450 status = acpi_get_handle(dhandle, "ATPX", &atpx_handle);
451 if (ACPI_FAILURE(status))
454 radeon_atpx_priv.dhandle = dhandle;
455 radeon_atpx_priv.atpx.handle = atpx_handle;
460 * radeon_atpx_init - verify the ATPX interface
462 * Verify the ATPX interface (all asics).
463 * Returns 0 on success, error on failure.
465 static int radeon_atpx_init(void)
469 /* set up the ATPX handle */
470 r = radeon_atpx_verify_interface(&radeon_atpx_priv.atpx);
474 /* validate the atpx setup */
475 r = radeon_atpx_validate(&radeon_atpx_priv.atpx);
483 * radeon_atpx_get_client_id - get the client id
487 * look up whether we are the integrated or discrete GPU (all asics).
488 * Returns the client id.
490 static int radeon_atpx_get_client_id(struct pci_dev *pdev)
492 if (radeon_atpx_priv.dhandle == DEVICE_ACPI_HANDLE(&pdev->dev))
493 return VGA_SWITCHEROO_IGD;
495 return VGA_SWITCHEROO_DIS;
498 static struct vga_switcheroo_handler radeon_atpx_handler = {
499 .switchto = radeon_atpx_switchto,
500 .power_state = radeon_atpx_power_state,
501 .init = radeon_atpx_init,
502 .get_client_id = radeon_atpx_get_client_id,
506 * radeon_atpx_detect - detect whether we have PX
508 * Check if we have a PX system (all asics).
509 * Returns true if we have a PX system, false if not.
511 static bool radeon_atpx_detect(void)
513 char acpi_method_name[255] = { 0 };
514 struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
515 struct pci_dev *pdev = NULL;
516 bool has_atpx = false;
519 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
522 has_atpx |= (radeon_atpx_pci_probe_handle(pdev) == true);
525 if (has_atpx && vga_count == 2) {
526 acpi_get_name(radeon_atpx_priv.atpx.handle, ACPI_FULL_PATHNAME, &buffer);
527 printk(KERN_INFO "VGA switcheroo: detected switching method %s handle\n",
529 radeon_atpx_priv.atpx_detected = true;
536 * radeon_register_atpx_handler - register with vga_switcheroo
538 * Register the PX callbacks with vga_switcheroo (all asics).
540 void radeon_register_atpx_handler(void)
544 /* detect if we have any ATPX + 2 VGA in the system */
545 r = radeon_atpx_detect();
549 vga_switcheroo_register_handler(&radeon_atpx_handler);
553 * radeon_unregister_atpx_handler - unregister with vga_switcheroo
555 * Unregister the PX callbacks with vga_switcheroo (all asics).
557 void radeon_unregister_atpx_handler(void)
559 vga_switcheroo_unregister_handler();