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>
14 #include "radeon_acpi.h"
16 struct radeon_atpx_functions {
23 bool disp_connectors_mapping;
24 bool disp_detetion_ports;
29 struct radeon_atpx_functions functions;
32 static struct radeon_atpx_priv {
34 /* handle for device - and atpx */
36 struct radeon_atpx atpx;
39 struct 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 */
45 struct 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 */
51 struct atpx_power_control {
61 bool radeon_is_px(void) {
62 return radeon_atpx_priv.atpx_detected;
66 * radeon_atpx_call - call an ATPX method
68 * @handle: acpi handle
69 * @function: the ATPX function to execute
70 * @params: ATPX function params
72 * Executes the requested ATPX function (all asics).
73 * Returns a pointer to the acpi output buffer.
75 static union acpi_object *radeon_atpx_call(acpi_handle handle, int function,
76 struct acpi_buffer *params)
79 union acpi_object atpx_arg_elements[2];
80 struct acpi_object_list atpx_arg;
81 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
84 atpx_arg.pointer = &atpx_arg_elements[0];
86 atpx_arg_elements[0].type = ACPI_TYPE_INTEGER;
87 atpx_arg_elements[0].integer.value = function;
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;
94 /* We need a second fake parameter */
95 atpx_arg_elements[1].type = ACPI_TYPE_INTEGER;
96 atpx_arg_elements[1].integer.value = 0;
99 status = acpi_evaluate_object(handle, NULL, &atpx_arg, &buffer);
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);
109 return buffer.pointer;
113 * radeon_atpx_parse_functions - parse supported functions
115 * @f: supported functions struct
116 * @mask: supported functions mask from ATPX
118 * Use the supported functions mask from ATPX function
119 * ATPX_FUNCTION_VERIFY_INTERFACE to determine what functions
120 * are supported (all asics).
122 static void radeon_atpx_parse_functions(struct radeon_atpx_functions *f, u32 mask)
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;
135 * radeon_atpx_validate_functions - validate ATPX functions
137 * @atpx: radeon atpx struct
139 * Validate that required functions are enabled (all asics).
140 * returns 0 on success, error on failure.
142 static int radeon_atpx_validate(struct radeon_atpx *atpx)
144 /* make sure required functions are enabled */
145 /* dGPU power control is required */
146 atpx->functions.power_cntl = true;
148 if (atpx->functions.px_params) {
149 union acpi_object *info;
150 struct atpx_px_params output;
154 info = radeon_atpx_call(atpx->handle, ATPX_FUNCTION_GET_PX_PARAMETERS, NULL);
158 memset(&output, 0, sizeof(output));
160 size = *(u16 *) info->buffer.pointer;
162 printk("ATPX buffer is too small: %zu\n", size);
166 size = min(sizeof(output), size);
168 memcpy(&output, info->buffer.pointer, size);
170 valid_bits = output.flags & output.valid_flags;
171 /* if separate mux flag is set, mux controls are required */
172 if (valid_bits & ATPX_SEPARATE_MUX_FOR_I2C) {
173 atpx->functions.i2c_mux_cntl = true;
174 atpx->functions.disp_mux_cntl = true;
176 /* if any outputs are muxed, mux controls are required */
177 if (valid_bits & (ATPX_CRT1_RGB_SIGNAL_MUXED |
178 ATPX_TV_SIGNAL_MUXED |
179 ATPX_DFP_SIGNAL_MUXED))
180 atpx->functions.disp_mux_cntl = true;
188 * radeon_atpx_verify_interface - verify ATPX
190 * @atpx: radeon atpx struct
192 * Execute the ATPX_FUNCTION_VERIFY_INTERFACE ATPX function
193 * to initialize ATPX and determine what features are supported
195 * returns 0 on success, error on failure.
197 static int radeon_atpx_verify_interface(struct radeon_atpx *atpx)
199 union acpi_object *info;
200 struct atpx_verify_interface output;
204 info = radeon_atpx_call(atpx->handle, ATPX_FUNCTION_VERIFY_INTERFACE, NULL);
208 memset(&output, 0, sizeof(output));
210 size = *(u16 *) info->buffer.pointer;
212 printk("ATPX buffer is too small: %zu\n", size);
216 size = min(sizeof(output), size);
218 memcpy(&output, info->buffer.pointer, size);
220 /* TODO: check version? */
221 printk("ATPX version %u\n", output.version);
223 radeon_atpx_parse_functions(&atpx->functions, output.function_bits);
231 * radeon_atpx_set_discrete_state - power up/down discrete GPU
233 * @atpx: atpx info struct
234 * @state: discrete GPU state (0 = power down, 1 = power up)
236 * Execute the ATPX_FUNCTION_POWER_CONTROL ATPX function to
237 * power down/up the discrete GPU (all asics).
238 * Returns 0 on success, error on failure.
240 static int radeon_atpx_set_discrete_state(struct radeon_atpx *atpx, u8 state)
242 struct acpi_buffer params;
243 union acpi_object *info;
244 struct atpx_power_control input;
246 if (atpx->functions.power_cntl) {
248 input.dgpu_state = state;
249 params.length = input.size;
250 params.pointer = &input;
251 info = radeon_atpx_call(atpx->handle,
252 ATPX_FUNCTION_POWER_CONTROL,
262 * radeon_atpx_switch_disp_mux - switch display mux
264 * @atpx: atpx info struct
265 * @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU)
267 * Execute the ATPX_FUNCTION_DISPLAY_MUX_CONTROL ATPX function to
268 * switch the display mux between the discrete GPU and integrated GPU
270 * Returns 0 on success, error on failure.
272 static int radeon_atpx_switch_disp_mux(struct radeon_atpx *atpx, u16 mux_id)
274 struct acpi_buffer params;
275 union acpi_object *info;
276 struct atpx_mux input;
278 if (atpx->functions.disp_mux_cntl) {
281 params.length = input.size;
282 params.pointer = &input;
283 info = radeon_atpx_call(atpx->handle,
284 ATPX_FUNCTION_DISPLAY_MUX_CONTROL,
294 * radeon_atpx_switch_i2c_mux - switch i2c/hpd mux
296 * @atpx: atpx info struct
297 * @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU)
299 * Execute the ATPX_FUNCTION_I2C_MUX_CONTROL ATPX function to
300 * switch the i2c/hpd mux between the discrete GPU and integrated GPU
302 * Returns 0 on success, error on failure.
304 static int radeon_atpx_switch_i2c_mux(struct radeon_atpx *atpx, u16 mux_id)
306 struct acpi_buffer params;
307 union acpi_object *info;
308 struct atpx_mux input;
310 if (atpx->functions.i2c_mux_cntl) {
313 params.length = input.size;
314 params.pointer = &input;
315 info = radeon_atpx_call(atpx->handle,
316 ATPX_FUNCTION_I2C_MUX_CONTROL,
326 * radeon_atpx_switch_start - notify the sbios of a GPU switch
328 * @atpx: atpx info struct
329 * @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU)
331 * Execute the ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_START_NOTIFICATION ATPX
332 * function to notify the sbios that a switch between the discrete GPU and
333 * integrated GPU has begun (all asics).
334 * Returns 0 on success, error on failure.
336 static int radeon_atpx_switch_start(struct radeon_atpx *atpx, u16 mux_id)
338 struct acpi_buffer params;
339 union acpi_object *info;
340 struct atpx_mux input;
342 if (atpx->functions.switch_start) {
345 params.length = input.size;
346 params.pointer = &input;
347 info = radeon_atpx_call(atpx->handle,
348 ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_START_NOTIFICATION,
358 * radeon_atpx_switch_end - notify the sbios of a GPU switch
360 * @atpx: atpx info struct
361 * @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU)
363 * Execute the ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_END_NOTIFICATION ATPX
364 * function to notify the sbios that a switch between the discrete GPU and
365 * integrated GPU has ended (all asics).
366 * Returns 0 on success, error on failure.
368 static int radeon_atpx_switch_end(struct radeon_atpx *atpx, u16 mux_id)
370 struct acpi_buffer params;
371 union acpi_object *info;
372 struct atpx_mux input;
374 if (atpx->functions.switch_end) {
377 params.length = input.size;
378 params.pointer = &input;
379 info = radeon_atpx_call(atpx->handle,
380 ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_END_NOTIFICATION,
390 * radeon_atpx_switchto - switch to the requested GPU
392 * @id: GPU to switch to
394 * Execute the necessary ATPX functions to switch between the discrete GPU and
395 * integrated GPU (all asics).
396 * Returns 0 on success, error on failure.
398 static int radeon_atpx_switchto(enum vga_switcheroo_client_id id)
402 if (id == VGA_SWITCHEROO_IGD)
403 gpu_id = ATPX_INTEGRATED_GPU;
405 gpu_id = ATPX_DISCRETE_GPU;
407 radeon_atpx_switch_start(&radeon_atpx_priv.atpx, gpu_id);
408 radeon_atpx_switch_disp_mux(&radeon_atpx_priv.atpx, gpu_id);
409 radeon_atpx_switch_i2c_mux(&radeon_atpx_priv.atpx, gpu_id);
410 radeon_atpx_switch_end(&radeon_atpx_priv.atpx, gpu_id);
416 * radeon_atpx_power_state - power down/up the requested GPU
418 * @id: GPU to power down/up
419 * @state: requested power state (0 = off, 1 = on)
421 * Execute the necessary ATPX function to power down/up the discrete GPU
423 * Returns 0 on success, error on failure.
425 static int radeon_atpx_power_state(enum vga_switcheroo_client_id id,
426 enum vga_switcheroo_state state)
428 /* on w500 ACPI can't change intel gpu state */
429 if (id == VGA_SWITCHEROO_IGD)
432 radeon_atpx_set_discrete_state(&radeon_atpx_priv.atpx, state);
437 * radeon_atpx_pci_probe_handle - look up the ATPX handle
441 * Look up the ATPX handles (all asics).
442 * Returns true if the handles are found, false if not.
444 static bool radeon_atpx_pci_probe_handle(struct pci_dev *pdev)
446 acpi_handle dhandle, atpx_handle;
449 dhandle = ACPI_HANDLE(&pdev->dev);
453 status = acpi_get_handle(dhandle, "ATPX", &atpx_handle);
454 if (ACPI_FAILURE(status))
457 radeon_atpx_priv.dhandle = dhandle;
458 radeon_atpx_priv.atpx.handle = atpx_handle;
463 * radeon_atpx_init - verify the ATPX interface
465 * Verify the ATPX interface (all asics).
466 * Returns 0 on success, error on failure.
468 static int radeon_atpx_init(void)
472 /* set up the ATPX handle */
473 r = radeon_atpx_verify_interface(&radeon_atpx_priv.atpx);
477 /* validate the atpx setup */
478 r = radeon_atpx_validate(&radeon_atpx_priv.atpx);
486 * radeon_atpx_get_client_id - get the client id
490 * look up whether we are the integrated or discrete GPU (all asics).
491 * Returns the client id.
493 static int radeon_atpx_get_client_id(struct pci_dev *pdev)
495 if (radeon_atpx_priv.dhandle == ACPI_HANDLE(&pdev->dev))
496 return VGA_SWITCHEROO_IGD;
498 return VGA_SWITCHEROO_DIS;
501 static struct vga_switcheroo_handler radeon_atpx_handler = {
502 .switchto = radeon_atpx_switchto,
503 .power_state = radeon_atpx_power_state,
504 .init = radeon_atpx_init,
505 .get_client_id = radeon_atpx_get_client_id,
509 * radeon_atpx_detect - detect whether we have PX
511 * Check if we have a PX system (all asics).
512 * Returns true if we have a PX system, false if not.
514 static bool radeon_atpx_detect(void)
516 char acpi_method_name[255] = { 0 };
517 struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
518 struct pci_dev *pdev = NULL;
519 bool has_atpx = false;
522 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
525 has_atpx |= (radeon_atpx_pci_probe_handle(pdev) == true);
528 if (has_atpx && vga_count == 2) {
529 acpi_get_name(radeon_atpx_priv.atpx.handle, ACPI_FULL_PATHNAME, &buffer);
530 printk(KERN_INFO "VGA switcheroo: detected switching method %s handle\n",
532 radeon_atpx_priv.atpx_detected = true;
539 * radeon_register_atpx_handler - register with vga_switcheroo
541 * Register the PX callbacks with vga_switcheroo (all asics).
543 void radeon_register_atpx_handler(void)
547 /* detect if we have any ATPX + 2 VGA in the system */
548 r = radeon_atpx_detect();
552 vga_switcheroo_register_handler(&radeon_atpx_handler);
556 * radeon_unregister_atpx_handler - unregister with vga_switcheroo
558 * Unregister the PX callbacks with vga_switcheroo (all asics).
560 void radeon_unregister_atpx_handler(void)
562 vga_switcheroo_unregister_handler();