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;
32 bool dgpu_req_power_for_displays;
35 static struct radeon_atpx_priv {
37 /* handle for device - and atpx */
39 struct radeon_atpx atpx;
42 struct atpx_verify_interface {
43 u16 size; /* structure size in bytes (includes size field) */
44 u16 version; /* version */
45 u32 function_bits; /* supported functions bit vector */
48 struct atpx_px_params {
49 u16 size; /* structure size in bytes (includes size field) */
50 u32 valid_flags; /* which flags are valid */
51 u32 flags; /* flags */
54 struct atpx_power_control {
64 bool radeon_has_atpx(void) {
65 return radeon_atpx_priv.atpx_detected;
68 bool radeon_has_atpx_dgpu_power_cntl(void) {
69 return radeon_atpx_priv.atpx.functions.power_cntl;
72 bool radeon_is_atpx_hybrid(void) {
73 return radeon_atpx_priv.atpx.is_hybrid;
76 bool radeon_atpx_dgpu_req_power_for_displays(void) {
77 return radeon_atpx_priv.atpx.dgpu_req_power_for_displays;
81 * radeon_atpx_call - call an ATPX method
83 * @handle: acpi handle
84 * @function: the ATPX function to execute
85 * @params: ATPX function params
87 * Executes the requested ATPX function (all asics).
88 * Returns a pointer to the acpi output buffer.
90 static union acpi_object *radeon_atpx_call(acpi_handle handle, int function,
91 struct acpi_buffer *params)
94 union acpi_object atpx_arg_elements[2];
95 struct acpi_object_list atpx_arg;
96 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
99 atpx_arg.pointer = &atpx_arg_elements[0];
101 atpx_arg_elements[0].type = ACPI_TYPE_INTEGER;
102 atpx_arg_elements[0].integer.value = function;
105 atpx_arg_elements[1].type = ACPI_TYPE_BUFFER;
106 atpx_arg_elements[1].buffer.length = params->length;
107 atpx_arg_elements[1].buffer.pointer = params->pointer;
109 /* We need a second fake parameter */
110 atpx_arg_elements[1].type = ACPI_TYPE_INTEGER;
111 atpx_arg_elements[1].integer.value = 0;
114 status = acpi_evaluate_object(handle, NULL, &atpx_arg, &buffer);
116 /* Fail only if calling the method fails and ATPX is supported */
117 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
118 printk("failed to evaluate ATPX got %s\n",
119 acpi_format_exception(status));
120 kfree(buffer.pointer);
124 return buffer.pointer;
128 * radeon_atpx_parse_functions - parse supported functions
130 * @f: supported functions struct
131 * @mask: supported functions mask from ATPX
133 * Use the supported functions mask from ATPX function
134 * ATPX_FUNCTION_VERIFY_INTERFACE to determine what functions
135 * are supported (all asics).
137 static void radeon_atpx_parse_functions(struct radeon_atpx_functions *f, u32 mask)
139 f->px_params = mask & ATPX_GET_PX_PARAMETERS_SUPPORTED;
140 f->power_cntl = mask & ATPX_POWER_CONTROL_SUPPORTED;
141 f->disp_mux_cntl = mask & ATPX_DISPLAY_MUX_CONTROL_SUPPORTED;
142 f->i2c_mux_cntl = mask & ATPX_I2C_MUX_CONTROL_SUPPORTED;
143 f->switch_start = mask & ATPX_GRAPHICS_DEVICE_SWITCH_START_NOTIFICATION_SUPPORTED;
144 f->switch_end = mask & ATPX_GRAPHICS_DEVICE_SWITCH_END_NOTIFICATION_SUPPORTED;
145 f->disp_connectors_mapping = mask & ATPX_GET_DISPLAY_CONNECTORS_MAPPING_SUPPORTED;
146 f->disp_detetion_ports = mask & ATPX_GET_DISPLAY_DETECTION_PORTS_SUPPORTED;
150 * radeon_atpx_validate_functions - validate ATPX functions
152 * @atpx: radeon atpx struct
154 * Validate that required functions are enabled (all asics).
155 * returns 0 on success, error on failure.
157 static int radeon_atpx_validate(struct radeon_atpx *atpx)
161 if (atpx->functions.px_params) {
162 union acpi_object *info;
163 struct atpx_px_params output;
166 info = radeon_atpx_call(atpx->handle, ATPX_FUNCTION_GET_PX_PARAMETERS, NULL);
170 memset(&output, 0, sizeof(output));
172 size = *(u16 *) info->buffer.pointer;
174 printk("ATPX buffer is too small: %zu\n", size);
178 size = min(sizeof(output), size);
180 memcpy(&output, info->buffer.pointer, size);
182 valid_bits = output.flags & output.valid_flags;
187 /* if separate mux flag is set, mux controls are required */
188 if (valid_bits & ATPX_SEPARATE_MUX_FOR_I2C) {
189 atpx->functions.i2c_mux_cntl = true;
190 atpx->functions.disp_mux_cntl = true;
192 /* if any outputs are muxed, mux controls are required */
193 if (valid_bits & (ATPX_CRT1_RGB_SIGNAL_MUXED |
194 ATPX_TV_SIGNAL_MUXED |
195 ATPX_DFP_SIGNAL_MUXED))
196 atpx->functions.disp_mux_cntl = true;
198 /* some bioses set these bits rather than flagging power_cntl as supported */
199 if (valid_bits & (ATPX_DYNAMIC_PX_SUPPORTED |
200 ATPX_DYNAMIC_DGPU_POWER_OFF_SUPPORTED))
201 atpx->functions.power_cntl = true;
203 atpx->is_hybrid = false;
204 if (valid_bits & ATPX_MS_HYBRID_GFX_SUPPORTED) {
205 printk("ATPX Hybrid Graphics\n");
207 /* This is a temporary hack until the D3 cold support
208 * makes it upstream. The ATPX power_control method seems
209 * to still work on even if the system should be using
210 * the new standardized hybrid D3 cold ACPI interface.
212 atpx->functions.power_cntl = true;
214 atpx->functions.power_cntl = false;
216 atpx->is_hybrid = true;
223 * radeon_atpx_verify_interface - verify ATPX
225 * @atpx: radeon atpx struct
227 * Execute the ATPX_FUNCTION_VERIFY_INTERFACE ATPX function
228 * to initialize ATPX and determine what features are supported
230 * returns 0 on success, error on failure.
232 static int radeon_atpx_verify_interface(struct radeon_atpx *atpx)
234 union acpi_object *info;
235 struct atpx_verify_interface output;
239 info = radeon_atpx_call(atpx->handle, ATPX_FUNCTION_VERIFY_INTERFACE, NULL);
243 memset(&output, 0, sizeof(output));
245 size = *(u16 *) info->buffer.pointer;
247 printk("ATPX buffer is too small: %zu\n", size);
251 size = min(sizeof(output), size);
253 memcpy(&output, info->buffer.pointer, size);
255 /* TODO: check version? */
256 printk("ATPX version %u, functions 0x%08x\n",
257 output.version, output.function_bits);
259 radeon_atpx_parse_functions(&atpx->functions, output.function_bits);
267 * radeon_atpx_set_discrete_state - power up/down discrete GPU
269 * @atpx: atpx info struct
270 * @state: discrete GPU state (0 = power down, 1 = power up)
272 * Execute the ATPX_FUNCTION_POWER_CONTROL ATPX function to
273 * power down/up the discrete GPU (all asics).
274 * Returns 0 on success, error on failure.
276 static int radeon_atpx_set_discrete_state(struct radeon_atpx *atpx, u8 state)
278 struct acpi_buffer params;
279 union acpi_object *info;
280 struct atpx_power_control input;
282 if (atpx->functions.power_cntl) {
284 input.dgpu_state = state;
285 params.length = input.size;
286 params.pointer = &input;
287 info = radeon_atpx_call(atpx->handle,
288 ATPX_FUNCTION_POWER_CONTROL,
294 /* 200ms delay is required after off */
302 * radeon_atpx_switch_disp_mux - switch display mux
304 * @atpx: atpx info struct
305 * @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU)
307 * Execute the ATPX_FUNCTION_DISPLAY_MUX_CONTROL ATPX function to
308 * switch the display mux between the discrete GPU and integrated GPU
310 * Returns 0 on success, error on failure.
312 static int radeon_atpx_switch_disp_mux(struct radeon_atpx *atpx, u16 mux_id)
314 struct acpi_buffer params;
315 union acpi_object *info;
316 struct atpx_mux input;
318 if (atpx->functions.disp_mux_cntl) {
321 params.length = input.size;
322 params.pointer = &input;
323 info = radeon_atpx_call(atpx->handle,
324 ATPX_FUNCTION_DISPLAY_MUX_CONTROL,
334 * radeon_atpx_switch_i2c_mux - switch i2c/hpd mux
336 * @atpx: atpx info struct
337 * @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU)
339 * Execute the ATPX_FUNCTION_I2C_MUX_CONTROL ATPX function to
340 * switch the i2c/hpd mux between the discrete GPU and integrated GPU
342 * Returns 0 on success, error on failure.
344 static int radeon_atpx_switch_i2c_mux(struct radeon_atpx *atpx, u16 mux_id)
346 struct acpi_buffer params;
347 union acpi_object *info;
348 struct atpx_mux input;
350 if (atpx->functions.i2c_mux_cntl) {
353 params.length = input.size;
354 params.pointer = &input;
355 info = radeon_atpx_call(atpx->handle,
356 ATPX_FUNCTION_I2C_MUX_CONTROL,
366 * radeon_atpx_switch_start - notify the sbios of a GPU switch
368 * @atpx: atpx info struct
369 * @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU)
371 * Execute the ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_START_NOTIFICATION ATPX
372 * function to notify the sbios that a switch between the discrete GPU and
373 * integrated GPU has begun (all asics).
374 * Returns 0 on success, error on failure.
376 static int radeon_atpx_switch_start(struct radeon_atpx *atpx, u16 mux_id)
378 struct acpi_buffer params;
379 union acpi_object *info;
380 struct atpx_mux input;
382 if (atpx->functions.switch_start) {
385 params.length = input.size;
386 params.pointer = &input;
387 info = radeon_atpx_call(atpx->handle,
388 ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_START_NOTIFICATION,
398 * radeon_atpx_switch_end - notify the sbios of a GPU switch
400 * @atpx: atpx info struct
401 * @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU)
403 * Execute the ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_END_NOTIFICATION ATPX
404 * function to notify the sbios that a switch between the discrete GPU and
405 * integrated GPU has ended (all asics).
406 * Returns 0 on success, error on failure.
408 static int radeon_atpx_switch_end(struct radeon_atpx *atpx, u16 mux_id)
410 struct acpi_buffer params;
411 union acpi_object *info;
412 struct atpx_mux input;
414 if (atpx->functions.switch_end) {
417 params.length = input.size;
418 params.pointer = &input;
419 info = radeon_atpx_call(atpx->handle,
420 ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_END_NOTIFICATION,
430 * radeon_atpx_switchto - switch to the requested GPU
432 * @id: GPU to switch to
434 * Execute the necessary ATPX functions to switch between the discrete GPU and
435 * integrated GPU (all asics).
436 * Returns 0 on success, error on failure.
438 static int radeon_atpx_switchto(enum vga_switcheroo_client_id id)
442 if (id == VGA_SWITCHEROO_IGD)
443 gpu_id = ATPX_INTEGRATED_GPU;
445 gpu_id = ATPX_DISCRETE_GPU;
447 radeon_atpx_switch_start(&radeon_atpx_priv.atpx, gpu_id);
448 radeon_atpx_switch_disp_mux(&radeon_atpx_priv.atpx, gpu_id);
449 radeon_atpx_switch_i2c_mux(&radeon_atpx_priv.atpx, gpu_id);
450 radeon_atpx_switch_end(&radeon_atpx_priv.atpx, gpu_id);
456 * radeon_atpx_power_state - power down/up the requested GPU
458 * @id: GPU to power down/up
459 * @state: requested power state (0 = off, 1 = on)
461 * Execute the necessary ATPX function to power down/up the discrete GPU
463 * Returns 0 on success, error on failure.
465 static int radeon_atpx_power_state(enum vga_switcheroo_client_id id,
466 enum vga_switcheroo_state state)
468 /* on w500 ACPI can't change intel gpu state */
469 if (id == VGA_SWITCHEROO_IGD)
472 radeon_atpx_set_discrete_state(&radeon_atpx_priv.atpx, state);
477 * radeon_atpx_pci_probe_handle - look up the ATPX handle
481 * Look up the ATPX handles (all asics).
482 * Returns true if the handles are found, false if not.
484 static bool radeon_atpx_pci_probe_handle(struct pci_dev *pdev)
486 acpi_handle dhandle, atpx_handle;
489 dhandle = ACPI_HANDLE(&pdev->dev);
493 status = acpi_get_handle(dhandle, "ATPX", &atpx_handle);
494 if (ACPI_FAILURE(status))
497 radeon_atpx_priv.dhandle = dhandle;
498 radeon_atpx_priv.atpx.handle = atpx_handle;
503 * radeon_atpx_init - verify the ATPX interface
505 * Verify the ATPX interface (all asics).
506 * Returns 0 on success, error on failure.
508 static int radeon_atpx_init(void)
512 /* set up the ATPX handle */
513 r = radeon_atpx_verify_interface(&radeon_atpx_priv.atpx);
517 /* validate the atpx setup */
518 r = radeon_atpx_validate(&radeon_atpx_priv.atpx);
526 * radeon_atpx_get_client_id - get the client id
530 * look up whether we are the integrated or discrete GPU (all asics).
531 * Returns the client id.
533 static int radeon_atpx_get_client_id(struct pci_dev *pdev)
535 if (radeon_atpx_priv.dhandle == ACPI_HANDLE(&pdev->dev))
536 return VGA_SWITCHEROO_IGD;
538 return VGA_SWITCHEROO_DIS;
541 static const struct vga_switcheroo_handler radeon_atpx_handler = {
542 .switchto = radeon_atpx_switchto,
543 .power_state = radeon_atpx_power_state,
544 .get_client_id = radeon_atpx_get_client_id,
548 * radeon_atpx_detect - detect whether we have PX
550 * Check if we have a PX system (all asics).
551 * Returns true if we have a PX system, false if not.
553 static bool radeon_atpx_detect(void)
555 char acpi_method_name[255] = { 0 };
556 struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
557 struct pci_dev *pdev = NULL;
558 bool has_atpx = false;
561 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
564 has_atpx |= (radeon_atpx_pci_probe_handle(pdev) == true);
567 /* some newer PX laptops mark the dGPU as a non-VGA display device */
568 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_OTHER << 8, pdev)) != NULL) {
571 has_atpx |= (radeon_atpx_pci_probe_handle(pdev) == true);
574 if (has_atpx && vga_count == 2) {
575 acpi_get_name(radeon_atpx_priv.atpx.handle, ACPI_FULL_PATHNAME, &buffer);
576 printk(KERN_INFO "vga_switcheroo: detected switching method %s handle\n",
578 radeon_atpx_priv.atpx_detected = true;
586 * radeon_register_atpx_handler - register with vga_switcheroo
588 * Register the PX callbacks with vga_switcheroo (all asics).
590 void radeon_register_atpx_handler(void)
593 enum vga_switcheroo_handler_flags_t handler_flags = 0;
595 /* detect if we have any ATPX + 2 VGA in the system */
596 r = radeon_atpx_detect();
600 vga_switcheroo_register_handler(&radeon_atpx_handler, handler_flags);
604 * radeon_unregister_atpx_handler - unregister with vga_switcheroo
606 * Unregister the PX callbacks with vga_switcheroo (all asics).
608 void radeon_unregister_atpx_handler(void)
610 vga_switcheroo_unregister_handler();