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;
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 {
62 bool radeon_has_atpx(void) {
63 return radeon_atpx_priv.atpx_detected;
67 * radeon_atpx_call - call an ATPX method
69 * @handle: acpi handle
70 * @function: the ATPX function to execute
71 * @params: ATPX function params
73 * Executes the requested ATPX function (all asics).
74 * Returns a pointer to the acpi output buffer.
76 static union acpi_object *radeon_atpx_call(acpi_handle handle, int function,
77 struct acpi_buffer *params)
80 union acpi_object atpx_arg_elements[2];
81 struct acpi_object_list atpx_arg;
82 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
85 atpx_arg.pointer = &atpx_arg_elements[0];
87 atpx_arg_elements[0].type = ACPI_TYPE_INTEGER;
88 atpx_arg_elements[0].integer.value = function;
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;
95 /* We need a second fake parameter */
96 atpx_arg_elements[1].type = ACPI_TYPE_INTEGER;
97 atpx_arg_elements[1].integer.value = 0;
100 status = acpi_evaluate_object(handle, NULL, &atpx_arg, &buffer);
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);
110 return buffer.pointer;
114 * radeon_atpx_parse_functions - parse supported functions
116 * @f: supported functions struct
117 * @mask: supported functions mask from ATPX
119 * Use the supported functions mask from ATPX function
120 * ATPX_FUNCTION_VERIFY_INTERFACE to determine what functions
121 * are supported (all asics).
123 static void radeon_atpx_parse_functions(struct radeon_atpx_functions *f, u32 mask)
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;
136 * radeon_atpx_validate_functions - validate ATPX functions
138 * @atpx: radeon atpx struct
140 * Validate that required functions are enabled (all asics).
141 * returns 0 on success, error on failure.
143 static int radeon_atpx_validate(struct radeon_atpx *atpx)
145 /* make sure required functions are enabled */
146 /* dGPU power control is required */
147 atpx->functions.power_cntl = true;
149 if (atpx->functions.px_params) {
150 union acpi_object *info;
151 struct atpx_px_params output;
155 info = radeon_atpx_call(atpx->handle, ATPX_FUNCTION_GET_PX_PARAMETERS, NULL);
159 memset(&output, 0, sizeof(output));
161 size = *(u16 *) info->buffer.pointer;
163 printk("ATPX buffer is too small: %zu\n", size);
167 size = min(sizeof(output), size);
169 memcpy(&output, info->buffer.pointer, size);
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;
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;
189 * radeon_atpx_verify_interface - verify ATPX
191 * @atpx: radeon atpx struct
193 * Execute the ATPX_FUNCTION_VERIFY_INTERFACE ATPX function
194 * to initialize ATPX and determine what features are supported
196 * returns 0 on success, error on failure.
198 static int radeon_atpx_verify_interface(struct radeon_atpx *atpx)
200 union acpi_object *info;
201 struct atpx_verify_interface output;
205 info = radeon_atpx_call(atpx->handle, ATPX_FUNCTION_VERIFY_INTERFACE, NULL);
209 memset(&output, 0, sizeof(output));
211 size = *(u16 *) info->buffer.pointer;
213 printk("ATPX buffer is too small: %zu\n", size);
217 size = min(sizeof(output), size);
219 memcpy(&output, info->buffer.pointer, size);
221 /* TODO: check version? */
222 printk("ATPX version %u, functions 0x%08x\n",
223 output.version, output.function_bits);
225 radeon_atpx_parse_functions(&atpx->functions, output.function_bits);
233 * radeon_atpx_set_discrete_state - power up/down discrete GPU
235 * @atpx: atpx info struct
236 * @state: discrete GPU state (0 = power down, 1 = power up)
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.
242 static int radeon_atpx_set_discrete_state(struct radeon_atpx *atpx, u8 state)
244 struct acpi_buffer params;
245 union acpi_object *info;
246 struct atpx_power_control input;
248 if (atpx->functions.power_cntl) {
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,
260 /* 200ms delay is required after off */
268 * radeon_atpx_switch_disp_mux - switch display mux
270 * @atpx: atpx info struct
271 * @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU)
273 * Execute the ATPX_FUNCTION_DISPLAY_MUX_CONTROL ATPX function to
274 * switch the display mux between the discrete GPU and integrated GPU
276 * Returns 0 on success, error on failure.
278 static int radeon_atpx_switch_disp_mux(struct radeon_atpx *atpx, u16 mux_id)
280 struct acpi_buffer params;
281 union acpi_object *info;
282 struct atpx_mux input;
284 if (atpx->functions.disp_mux_cntl) {
287 params.length = input.size;
288 params.pointer = &input;
289 info = radeon_atpx_call(atpx->handle,
290 ATPX_FUNCTION_DISPLAY_MUX_CONTROL,
300 * radeon_atpx_switch_i2c_mux - switch i2c/hpd mux
302 * @atpx: atpx info struct
303 * @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU)
305 * Execute the ATPX_FUNCTION_I2C_MUX_CONTROL ATPX function to
306 * switch the i2c/hpd mux between the discrete GPU and integrated GPU
308 * Returns 0 on success, error on failure.
310 static int radeon_atpx_switch_i2c_mux(struct radeon_atpx *atpx, u16 mux_id)
312 struct acpi_buffer params;
313 union acpi_object *info;
314 struct atpx_mux input;
316 if (atpx->functions.i2c_mux_cntl) {
319 params.length = input.size;
320 params.pointer = &input;
321 info = radeon_atpx_call(atpx->handle,
322 ATPX_FUNCTION_I2C_MUX_CONTROL,
332 * radeon_atpx_switch_start - notify the sbios of a GPU switch
334 * @atpx: atpx info struct
335 * @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU)
337 * Execute the ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_START_NOTIFICATION ATPX
338 * function to notify the sbios that a switch between the discrete GPU and
339 * integrated GPU has begun (all asics).
340 * Returns 0 on success, error on failure.
342 static int radeon_atpx_switch_start(struct radeon_atpx *atpx, u16 mux_id)
344 struct acpi_buffer params;
345 union acpi_object *info;
346 struct atpx_mux input;
348 if (atpx->functions.switch_start) {
351 params.length = input.size;
352 params.pointer = &input;
353 info = radeon_atpx_call(atpx->handle,
354 ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_START_NOTIFICATION,
364 * radeon_atpx_switch_end - notify the sbios of a GPU switch
366 * @atpx: atpx info struct
367 * @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU)
369 * Execute the ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_END_NOTIFICATION ATPX
370 * function to notify the sbios that a switch between the discrete GPU and
371 * integrated GPU has ended (all asics).
372 * Returns 0 on success, error on failure.
374 static int radeon_atpx_switch_end(struct radeon_atpx *atpx, u16 mux_id)
376 struct acpi_buffer params;
377 union acpi_object *info;
378 struct atpx_mux input;
380 if (atpx->functions.switch_end) {
383 params.length = input.size;
384 params.pointer = &input;
385 info = radeon_atpx_call(atpx->handle,
386 ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_END_NOTIFICATION,
396 * radeon_atpx_switchto - switch to the requested GPU
398 * @id: GPU to switch to
400 * Execute the necessary ATPX functions to switch between the discrete GPU and
401 * integrated GPU (all asics).
402 * Returns 0 on success, error on failure.
404 static int radeon_atpx_switchto(enum vga_switcheroo_client_id id)
408 if (id == VGA_SWITCHEROO_IGD)
409 gpu_id = ATPX_INTEGRATED_GPU;
411 gpu_id = ATPX_DISCRETE_GPU;
413 radeon_atpx_switch_start(&radeon_atpx_priv.atpx, gpu_id);
414 radeon_atpx_switch_disp_mux(&radeon_atpx_priv.atpx, gpu_id);
415 radeon_atpx_switch_i2c_mux(&radeon_atpx_priv.atpx, gpu_id);
416 radeon_atpx_switch_end(&radeon_atpx_priv.atpx, gpu_id);
422 * radeon_atpx_power_state - power down/up the requested GPU
424 * @id: GPU to power down/up
425 * @state: requested power state (0 = off, 1 = on)
427 * Execute the necessary ATPX function to power down/up the discrete GPU
429 * Returns 0 on success, error on failure.
431 static int radeon_atpx_power_state(enum vga_switcheroo_client_id id,
432 enum vga_switcheroo_state state)
434 /* on w500 ACPI can't change intel gpu state */
435 if (id == VGA_SWITCHEROO_IGD)
438 radeon_atpx_set_discrete_state(&radeon_atpx_priv.atpx, state);
443 * radeon_atpx_pci_probe_handle - look up the ATPX handle
447 * Look up the ATPX handles (all asics).
448 * Returns true if the handles are found, false if not.
450 static bool radeon_atpx_pci_probe_handle(struct pci_dev *pdev)
452 acpi_handle dhandle, atpx_handle;
455 dhandle = ACPI_HANDLE(&pdev->dev);
459 status = acpi_get_handle(dhandle, "ATPX", &atpx_handle);
460 if (ACPI_FAILURE(status))
463 radeon_atpx_priv.dhandle = dhandle;
464 radeon_atpx_priv.atpx.handle = atpx_handle;
469 * radeon_atpx_init - verify the ATPX interface
471 * Verify the ATPX interface (all asics).
472 * Returns 0 on success, error on failure.
474 static int radeon_atpx_init(void)
478 /* set up the ATPX handle */
479 r = radeon_atpx_verify_interface(&radeon_atpx_priv.atpx);
483 /* validate the atpx setup */
484 r = radeon_atpx_validate(&radeon_atpx_priv.atpx);
492 * radeon_atpx_get_client_id - get the client id
496 * look up whether we are the integrated or discrete GPU (all asics).
497 * Returns the client id.
499 static int radeon_atpx_get_client_id(struct pci_dev *pdev)
501 if (radeon_atpx_priv.dhandle == ACPI_HANDLE(&pdev->dev))
502 return VGA_SWITCHEROO_IGD;
504 return VGA_SWITCHEROO_DIS;
507 static const struct vga_switcheroo_handler radeon_atpx_handler = {
508 .switchto = radeon_atpx_switchto,
509 .power_state = radeon_atpx_power_state,
510 .init = radeon_atpx_init,
511 .get_client_id = radeon_atpx_get_client_id,
515 * radeon_atpx_detect - detect whether we have PX
517 * Check if we have a PX system (all asics).
518 * Returns true if we have a PX system, false if not.
520 static bool radeon_atpx_detect(void)
522 char acpi_method_name[255] = { 0 };
523 struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
524 struct pci_dev *pdev = NULL;
525 bool has_atpx = false;
528 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
531 has_atpx |= (radeon_atpx_pci_probe_handle(pdev) == true);
534 /* some newer PX laptops mark the dGPU as a non-VGA display device */
535 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_OTHER << 8, pdev)) != NULL) {
538 has_atpx |= (radeon_atpx_pci_probe_handle(pdev) == true);
541 if (has_atpx && vga_count == 2) {
542 acpi_get_name(radeon_atpx_priv.atpx.handle, ACPI_FULL_PATHNAME, &buffer);
543 printk(KERN_INFO "vga_switcheroo: detected switching method %s handle\n",
545 radeon_atpx_priv.atpx_detected = true;
552 * radeon_register_atpx_handler - register with vga_switcheroo
554 * Register the PX callbacks with vga_switcheroo (all asics).
556 void radeon_register_atpx_handler(void)
560 /* detect if we have any ATPX + 2 VGA in the system */
561 r = radeon_atpx_detect();
565 vga_switcheroo_register_handler(&radeon_atpx_handler);
569 * radeon_unregister_atpx_handler - unregister with vga_switcheroo
571 * Unregister the PX callbacks with vga_switcheroo (all asics).
573 void radeon_unregister_atpx_handler(void)
575 vga_switcheroo_unregister_handler();