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_has_atpx(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 if (atpx->functions.power_cntl == false) {
147 printk("ATPX dGPU power cntl not present, forcing\n");
148 atpx->functions.power_cntl = true;
151 if (atpx->functions.px_params) {
152 union acpi_object *info;
153 struct atpx_px_params output;
157 info = radeon_atpx_call(atpx->handle, ATPX_FUNCTION_GET_PX_PARAMETERS, NULL);
161 memset(&output, 0, sizeof(output));
163 size = *(u16 *) info->buffer.pointer;
165 printk("ATPX buffer is too small: %zu\n", size);
169 size = min(sizeof(output), size);
171 memcpy(&output, info->buffer.pointer, size);
173 valid_bits = output.flags & output.valid_flags;
174 /* if separate mux flag is set, mux controls are required */
175 if (valid_bits & ATPX_SEPARATE_MUX_FOR_I2C) {
176 atpx->functions.i2c_mux_cntl = true;
177 atpx->functions.disp_mux_cntl = true;
179 /* if any outputs are muxed, mux controls are required */
180 if (valid_bits & (ATPX_CRT1_RGB_SIGNAL_MUXED |
181 ATPX_TV_SIGNAL_MUXED |
182 ATPX_DFP_SIGNAL_MUXED))
183 atpx->functions.disp_mux_cntl = true;
185 if (valid_bits & ATPX_MS_HYBRID_GFX_SUPPORTED) {
186 printk("Hybrid Graphics, ATPX dGPU power cntl disabled\n");
187 atpx->functions.power_cntl = false;
196 * radeon_atpx_verify_interface - verify ATPX
198 * @atpx: radeon atpx struct
200 * Execute the ATPX_FUNCTION_VERIFY_INTERFACE ATPX function
201 * to initialize ATPX and determine what features are supported
203 * returns 0 on success, error on failure.
205 static int radeon_atpx_verify_interface(struct radeon_atpx *atpx)
207 union acpi_object *info;
208 struct atpx_verify_interface output;
212 info = radeon_atpx_call(atpx->handle, ATPX_FUNCTION_VERIFY_INTERFACE, NULL);
216 memset(&output, 0, sizeof(output));
218 size = *(u16 *) info->buffer.pointer;
220 printk("ATPX buffer is too small: %zu\n", size);
224 size = min(sizeof(output), size);
226 memcpy(&output, info->buffer.pointer, size);
228 /* TODO: check version? */
229 printk("ATPX version %u, functions 0x%08x\n",
230 output.version, output.function_bits);
232 radeon_atpx_parse_functions(&atpx->functions, output.function_bits);
240 * radeon_atpx_set_discrete_state - power up/down discrete GPU
242 * @atpx: atpx info struct
243 * @state: discrete GPU state (0 = power down, 1 = power up)
245 * Execute the ATPX_FUNCTION_POWER_CONTROL ATPX function to
246 * power down/up the discrete GPU (all asics).
247 * Returns 0 on success, error on failure.
249 static int radeon_atpx_set_discrete_state(struct radeon_atpx *atpx, u8 state)
251 struct acpi_buffer params;
252 union acpi_object *info;
253 struct atpx_power_control input;
255 if (atpx->functions.power_cntl) {
257 input.dgpu_state = state;
258 params.length = input.size;
259 params.pointer = &input;
260 info = radeon_atpx_call(atpx->handle,
261 ATPX_FUNCTION_POWER_CONTROL,
271 * radeon_atpx_switch_disp_mux - switch display mux
273 * @atpx: atpx info struct
274 * @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU)
276 * Execute the ATPX_FUNCTION_DISPLAY_MUX_CONTROL ATPX function to
277 * switch the display mux between the discrete GPU and integrated GPU
279 * Returns 0 on success, error on failure.
281 static int radeon_atpx_switch_disp_mux(struct radeon_atpx *atpx, u16 mux_id)
283 struct acpi_buffer params;
284 union acpi_object *info;
285 struct atpx_mux input;
287 if (atpx->functions.disp_mux_cntl) {
290 params.length = input.size;
291 params.pointer = &input;
292 info = radeon_atpx_call(atpx->handle,
293 ATPX_FUNCTION_DISPLAY_MUX_CONTROL,
303 * radeon_atpx_switch_i2c_mux - switch i2c/hpd mux
305 * @atpx: atpx info struct
306 * @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU)
308 * Execute the ATPX_FUNCTION_I2C_MUX_CONTROL ATPX function to
309 * switch the i2c/hpd mux between the discrete GPU and integrated GPU
311 * Returns 0 on success, error on failure.
313 static int radeon_atpx_switch_i2c_mux(struct radeon_atpx *atpx, u16 mux_id)
315 struct acpi_buffer params;
316 union acpi_object *info;
317 struct atpx_mux input;
319 if (atpx->functions.i2c_mux_cntl) {
322 params.length = input.size;
323 params.pointer = &input;
324 info = radeon_atpx_call(atpx->handle,
325 ATPX_FUNCTION_I2C_MUX_CONTROL,
335 * radeon_atpx_switch_start - notify the sbios of a GPU switch
337 * @atpx: atpx info struct
338 * @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU)
340 * Execute the ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_START_NOTIFICATION ATPX
341 * function to notify the sbios that a switch between the discrete GPU and
342 * integrated GPU has begun (all asics).
343 * Returns 0 on success, error on failure.
345 static int radeon_atpx_switch_start(struct radeon_atpx *atpx, u16 mux_id)
347 struct acpi_buffer params;
348 union acpi_object *info;
349 struct atpx_mux input;
351 if (atpx->functions.switch_start) {
354 params.length = input.size;
355 params.pointer = &input;
356 info = radeon_atpx_call(atpx->handle,
357 ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_START_NOTIFICATION,
367 * radeon_atpx_switch_end - notify the sbios of a GPU switch
369 * @atpx: atpx info struct
370 * @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU)
372 * Execute the ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_END_NOTIFICATION ATPX
373 * function to notify the sbios that a switch between the discrete GPU and
374 * integrated GPU has ended (all asics).
375 * Returns 0 on success, error on failure.
377 static int radeon_atpx_switch_end(struct radeon_atpx *atpx, u16 mux_id)
379 struct acpi_buffer params;
380 union acpi_object *info;
381 struct atpx_mux input;
383 if (atpx->functions.switch_end) {
386 params.length = input.size;
387 params.pointer = &input;
388 info = radeon_atpx_call(atpx->handle,
389 ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_END_NOTIFICATION,
399 * radeon_atpx_switchto - switch to the requested GPU
401 * @id: GPU to switch to
403 * Execute the necessary ATPX functions to switch between the discrete GPU and
404 * integrated GPU (all asics).
405 * Returns 0 on success, error on failure.
407 static int radeon_atpx_switchto(enum vga_switcheroo_client_id id)
411 if (id == VGA_SWITCHEROO_IGD)
412 gpu_id = ATPX_INTEGRATED_GPU;
414 gpu_id = ATPX_DISCRETE_GPU;
416 radeon_atpx_switch_start(&radeon_atpx_priv.atpx, gpu_id);
417 radeon_atpx_switch_disp_mux(&radeon_atpx_priv.atpx, gpu_id);
418 radeon_atpx_switch_i2c_mux(&radeon_atpx_priv.atpx, gpu_id);
419 radeon_atpx_switch_end(&radeon_atpx_priv.atpx, gpu_id);
425 * radeon_atpx_power_state - power down/up the requested GPU
427 * @id: GPU to power down/up
428 * @state: requested power state (0 = off, 1 = on)
430 * Execute the necessary ATPX function to power down/up the discrete GPU
432 * Returns 0 on success, error on failure.
434 static int radeon_atpx_power_state(enum vga_switcheroo_client_id id,
435 enum vga_switcheroo_state state)
437 /* on w500 ACPI can't change intel gpu state */
438 if (id == VGA_SWITCHEROO_IGD)
441 radeon_atpx_set_discrete_state(&radeon_atpx_priv.atpx, state);
446 * radeon_atpx_pci_probe_handle - look up the ATPX handle
450 * Look up the ATPX handles (all asics).
451 * Returns true if the handles are found, false if not.
453 static bool radeon_atpx_pci_probe_handle(struct pci_dev *pdev)
455 acpi_handle dhandle, atpx_handle;
458 dhandle = ACPI_HANDLE(&pdev->dev);
462 status = acpi_get_handle(dhandle, "ATPX", &atpx_handle);
463 if (ACPI_FAILURE(status))
466 radeon_atpx_priv.dhandle = dhandle;
467 radeon_atpx_priv.atpx.handle = atpx_handle;
472 * radeon_atpx_init - verify the ATPX interface
474 * Verify the ATPX interface (all asics).
475 * Returns 0 on success, error on failure.
477 static int radeon_atpx_init(void)
481 /* set up the ATPX handle */
482 r = radeon_atpx_verify_interface(&radeon_atpx_priv.atpx);
486 /* validate the atpx setup */
487 r = radeon_atpx_validate(&radeon_atpx_priv.atpx);
495 * radeon_atpx_get_client_id - get the client id
499 * look up whether we are the integrated or discrete GPU (all asics).
500 * Returns the client id.
502 static int radeon_atpx_get_client_id(struct pci_dev *pdev)
504 if (radeon_atpx_priv.dhandle == ACPI_HANDLE(&pdev->dev))
505 return VGA_SWITCHEROO_IGD;
507 return VGA_SWITCHEROO_DIS;
510 static const struct vga_switcheroo_handler radeon_atpx_handler = {
511 .switchto = radeon_atpx_switchto,
512 .power_state = radeon_atpx_power_state,
513 .init = radeon_atpx_init,
514 .get_client_id = radeon_atpx_get_client_id,
518 * radeon_atpx_detect - detect whether we have PX
520 * Check if we have a PX system (all asics).
521 * Returns true if we have a PX system, false if not.
523 static bool radeon_atpx_detect(void)
525 char acpi_method_name[255] = { 0 };
526 struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
527 struct pci_dev *pdev = NULL;
528 bool has_atpx = false;
531 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
534 has_atpx |= (radeon_atpx_pci_probe_handle(pdev) == true);
537 /* some newer PX laptops mark the dGPU as a non-VGA display device */
538 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_OTHER << 8, pdev)) != NULL) {
541 has_atpx |= (radeon_atpx_pci_probe_handle(pdev) == true);
544 if (has_atpx && vga_count == 2) {
545 acpi_get_name(radeon_atpx_priv.atpx.handle, ACPI_FULL_PATHNAME, &buffer);
546 printk(KERN_INFO "vga_switcheroo: detected switching method %s handle\n",
548 radeon_atpx_priv.atpx_detected = true;
555 * radeon_register_atpx_handler - register with vga_switcheroo
557 * Register the PX callbacks with vga_switcheroo (all asics).
559 void radeon_register_atpx_handler(void)
562 enum vga_switcheroo_handler_flags_t handler_flags = 0;
564 /* detect if we have any ATPX + 2 VGA in the system */
565 r = radeon_atpx_detect();
569 vga_switcheroo_register_handler(&radeon_atpx_handler, handler_flags);
573 * radeon_unregister_atpx_handler - unregister with vga_switcheroo
575 * Unregister the PX callbacks with vga_switcheroo (all asics).
577 void radeon_unregister_atpx_handler(void)
579 vga_switcheroo_unregister_handler();