2 * Copyright (c) 2010 Red Hat Inc.
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>
17 struct amdgpu_atpx_functions {
24 bool disp_connectors_mapping;
25 bool disp_detetion_ports;
30 struct amdgpu_atpx_functions functions;
32 bool dgpu_req_power_for_displays;
35 static struct amdgpu_atpx_priv {
37 bool bridge_pm_usable;
38 /* handle for device - and atpx */
40 acpi_handle other_handle;
41 struct amdgpu_atpx atpx;
44 struct atpx_verify_interface {
45 u16 size; /* structure size in bytes (includes size field) */
46 u16 version; /* version */
47 u32 function_bits; /* supported functions bit vector */
50 struct atpx_px_params {
51 u16 size; /* structure size in bytes (includes size field) */
52 u32 valid_flags; /* which flags are valid */
53 u32 flags; /* flags */
56 struct atpx_power_control {
66 bool amdgpu_has_atpx(void) {
67 return amdgpu_atpx_priv.atpx_detected;
70 bool amdgpu_has_atpx_dgpu_power_cntl(void) {
71 return amdgpu_atpx_priv.atpx.functions.power_cntl;
74 bool amdgpu_is_atpx_hybrid(void) {
75 return amdgpu_atpx_priv.atpx.is_hybrid;
78 bool amdgpu_atpx_dgpu_req_power_for_displays(void) {
79 return amdgpu_atpx_priv.atpx.dgpu_req_power_for_displays;
83 * amdgpu_atpx_call - call an ATPX method
85 * @handle: acpi handle
86 * @function: the ATPX function to execute
87 * @params: ATPX function params
89 * Executes the requested ATPX function (all asics).
90 * Returns a pointer to the acpi output buffer.
92 static union acpi_object *amdgpu_atpx_call(acpi_handle handle, int function,
93 struct acpi_buffer *params)
96 union acpi_object atpx_arg_elements[2];
97 struct acpi_object_list atpx_arg;
98 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
101 atpx_arg.pointer = &atpx_arg_elements[0];
103 atpx_arg_elements[0].type = ACPI_TYPE_INTEGER;
104 atpx_arg_elements[0].integer.value = function;
107 atpx_arg_elements[1].type = ACPI_TYPE_BUFFER;
108 atpx_arg_elements[1].buffer.length = params->length;
109 atpx_arg_elements[1].buffer.pointer = params->pointer;
111 /* We need a second fake parameter */
112 atpx_arg_elements[1].type = ACPI_TYPE_INTEGER;
113 atpx_arg_elements[1].integer.value = 0;
116 status = acpi_evaluate_object(handle, NULL, &atpx_arg, &buffer);
118 /* Fail only if calling the method fails and ATPX is supported */
119 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
120 printk("failed to evaluate ATPX got %s\n",
121 acpi_format_exception(status));
122 kfree(buffer.pointer);
126 return buffer.pointer;
130 * amdgpu_atpx_parse_functions - parse supported functions
132 * @f: supported functions struct
133 * @mask: supported functions mask from ATPX
135 * Use the supported functions mask from ATPX function
136 * ATPX_FUNCTION_VERIFY_INTERFACE to determine what functions
137 * are supported (all asics).
139 static void amdgpu_atpx_parse_functions(struct amdgpu_atpx_functions *f, u32 mask)
141 f->px_params = mask & ATPX_GET_PX_PARAMETERS_SUPPORTED;
142 f->power_cntl = mask & ATPX_POWER_CONTROL_SUPPORTED;
143 f->disp_mux_cntl = mask & ATPX_DISPLAY_MUX_CONTROL_SUPPORTED;
144 f->i2c_mux_cntl = mask & ATPX_I2C_MUX_CONTROL_SUPPORTED;
145 f->switch_start = mask & ATPX_GRAPHICS_DEVICE_SWITCH_START_NOTIFICATION_SUPPORTED;
146 f->switch_end = mask & ATPX_GRAPHICS_DEVICE_SWITCH_END_NOTIFICATION_SUPPORTED;
147 f->disp_connectors_mapping = mask & ATPX_GET_DISPLAY_CONNECTORS_MAPPING_SUPPORTED;
148 f->disp_detetion_ports = mask & ATPX_GET_DISPLAY_DETECTION_PORTS_SUPPORTED;
152 * amdgpu_atpx_validate_functions - validate ATPX functions
154 * @atpx: amdgpu atpx struct
156 * Validate that required functions are enabled (all asics).
157 * returns 0 on success, error on failure.
159 static int amdgpu_atpx_validate(struct amdgpu_atpx *atpx)
163 if (atpx->functions.px_params) {
164 union acpi_object *info;
165 struct atpx_px_params output;
168 info = amdgpu_atpx_call(atpx->handle, ATPX_FUNCTION_GET_PX_PARAMETERS, NULL);
172 memset(&output, 0, sizeof(output));
174 size = *(u16 *) info->buffer.pointer;
176 printk("ATPX buffer is too small: %zu\n", size);
180 size = min(sizeof(output), size);
182 memcpy(&output, info->buffer.pointer, size);
184 valid_bits = output.flags & output.valid_flags;
189 /* if separate mux flag is set, mux controls are required */
190 if (valid_bits & ATPX_SEPARATE_MUX_FOR_I2C) {
191 atpx->functions.i2c_mux_cntl = true;
192 atpx->functions.disp_mux_cntl = true;
194 /* if any outputs are muxed, mux controls are required */
195 if (valid_bits & (ATPX_CRT1_RGB_SIGNAL_MUXED |
196 ATPX_TV_SIGNAL_MUXED |
197 ATPX_DFP_SIGNAL_MUXED))
198 atpx->functions.disp_mux_cntl = true;
201 /* some bioses set these bits rather than flagging power_cntl as supported */
202 if (valid_bits & (ATPX_DYNAMIC_PX_SUPPORTED |
203 ATPX_DYNAMIC_DGPU_POWER_OFF_SUPPORTED))
204 atpx->functions.power_cntl = true;
206 atpx->is_hybrid = false;
207 if (valid_bits & ATPX_MS_HYBRID_GFX_SUPPORTED) {
208 printk("ATPX Hybrid Graphics\n");
210 * Disable legacy PM methods only when pcie port PM is usable,
211 * otherwise the device might fail to power off or power on.
213 atpx->functions.power_cntl = !amdgpu_atpx_priv.bridge_pm_usable;
214 atpx->is_hybrid = true;
217 atpx->dgpu_req_power_for_displays = false;
218 if (valid_bits & ATPX_DGPU_REQ_POWER_FOR_DISPLAYS)
219 atpx->dgpu_req_power_for_displays = true;
225 * amdgpu_atpx_verify_interface - verify ATPX
227 * @atpx: amdgpu atpx struct
229 * Execute the ATPX_FUNCTION_VERIFY_INTERFACE ATPX function
230 * to initialize ATPX and determine what features are supported
232 * returns 0 on success, error on failure.
234 static int amdgpu_atpx_verify_interface(struct amdgpu_atpx *atpx)
236 union acpi_object *info;
237 struct atpx_verify_interface output;
241 info = amdgpu_atpx_call(atpx->handle, ATPX_FUNCTION_VERIFY_INTERFACE, NULL);
245 memset(&output, 0, sizeof(output));
247 size = *(u16 *) info->buffer.pointer;
249 printk("ATPX buffer is too small: %zu\n", size);
253 size = min(sizeof(output), size);
255 memcpy(&output, info->buffer.pointer, size);
257 /* TODO: check version? */
258 printk("ATPX version %u, functions 0x%08x\n",
259 output.version, output.function_bits);
261 amdgpu_atpx_parse_functions(&atpx->functions, output.function_bits);
269 * amdgpu_atpx_set_discrete_state - power up/down discrete GPU
271 * @atpx: atpx info struct
272 * @state: discrete GPU state (0 = power down, 1 = power up)
274 * Execute the ATPX_FUNCTION_POWER_CONTROL ATPX function to
275 * power down/up the discrete GPU (all asics).
276 * Returns 0 on success, error on failure.
278 static int amdgpu_atpx_set_discrete_state(struct amdgpu_atpx *atpx, u8 state)
280 struct acpi_buffer params;
281 union acpi_object *info;
282 struct atpx_power_control input;
284 if (atpx->functions.power_cntl) {
286 input.dgpu_state = state;
287 params.length = input.size;
288 params.pointer = &input;
289 info = amdgpu_atpx_call(atpx->handle,
290 ATPX_FUNCTION_POWER_CONTROL,
296 /* 200ms delay is required after off */
304 * amdgpu_atpx_switch_disp_mux - switch display mux
306 * @atpx: atpx info struct
307 * @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU)
309 * Execute the ATPX_FUNCTION_DISPLAY_MUX_CONTROL ATPX function to
310 * switch the display mux between the discrete GPU and integrated GPU
312 * Returns 0 on success, error on failure.
314 static int amdgpu_atpx_switch_disp_mux(struct amdgpu_atpx *atpx, u16 mux_id)
316 struct acpi_buffer params;
317 union acpi_object *info;
318 struct atpx_mux input;
320 if (atpx->functions.disp_mux_cntl) {
323 params.length = input.size;
324 params.pointer = &input;
325 info = amdgpu_atpx_call(atpx->handle,
326 ATPX_FUNCTION_DISPLAY_MUX_CONTROL,
336 * amdgpu_atpx_switch_i2c_mux - switch i2c/hpd mux
338 * @atpx: atpx info struct
339 * @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU)
341 * Execute the ATPX_FUNCTION_I2C_MUX_CONTROL ATPX function to
342 * switch the i2c/hpd mux between the discrete GPU and integrated GPU
344 * Returns 0 on success, error on failure.
346 static int amdgpu_atpx_switch_i2c_mux(struct amdgpu_atpx *atpx, u16 mux_id)
348 struct acpi_buffer params;
349 union acpi_object *info;
350 struct atpx_mux input;
352 if (atpx->functions.i2c_mux_cntl) {
355 params.length = input.size;
356 params.pointer = &input;
357 info = amdgpu_atpx_call(atpx->handle,
358 ATPX_FUNCTION_I2C_MUX_CONTROL,
368 * amdgpu_atpx_switch_start - notify the sbios of a GPU switch
370 * @atpx: atpx info struct
371 * @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU)
373 * Execute the ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_START_NOTIFICATION ATPX
374 * function to notify the sbios that a switch between the discrete GPU and
375 * integrated GPU has begun (all asics).
376 * Returns 0 on success, error on failure.
378 static int amdgpu_atpx_switch_start(struct amdgpu_atpx *atpx, u16 mux_id)
380 struct acpi_buffer params;
381 union acpi_object *info;
382 struct atpx_mux input;
384 if (atpx->functions.switch_start) {
387 params.length = input.size;
388 params.pointer = &input;
389 info = amdgpu_atpx_call(atpx->handle,
390 ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_START_NOTIFICATION,
400 * amdgpu_atpx_switch_end - notify the sbios of a GPU switch
402 * @atpx: atpx info struct
403 * @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU)
405 * Execute the ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_END_NOTIFICATION ATPX
406 * function to notify the sbios that a switch between the discrete GPU and
407 * integrated GPU has ended (all asics).
408 * Returns 0 on success, error on failure.
410 static int amdgpu_atpx_switch_end(struct amdgpu_atpx *atpx, u16 mux_id)
412 struct acpi_buffer params;
413 union acpi_object *info;
414 struct atpx_mux input;
416 if (atpx->functions.switch_end) {
419 params.length = input.size;
420 params.pointer = &input;
421 info = amdgpu_atpx_call(atpx->handle,
422 ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_END_NOTIFICATION,
432 * amdgpu_atpx_switchto - switch to the requested GPU
434 * @id: GPU to switch to
436 * Execute the necessary ATPX functions to switch between the discrete GPU and
437 * integrated GPU (all asics).
438 * Returns 0 on success, error on failure.
440 static int amdgpu_atpx_switchto(enum vga_switcheroo_client_id id)
444 if (id == VGA_SWITCHEROO_IGD)
445 gpu_id = ATPX_INTEGRATED_GPU;
447 gpu_id = ATPX_DISCRETE_GPU;
449 amdgpu_atpx_switch_start(&amdgpu_atpx_priv.atpx, gpu_id);
450 amdgpu_atpx_switch_disp_mux(&amdgpu_atpx_priv.atpx, gpu_id);
451 amdgpu_atpx_switch_i2c_mux(&amdgpu_atpx_priv.atpx, gpu_id);
452 amdgpu_atpx_switch_end(&amdgpu_atpx_priv.atpx, gpu_id);
458 * amdgpu_atpx_power_state - power down/up the requested GPU
460 * @id: GPU to power down/up
461 * @state: requested power state (0 = off, 1 = on)
463 * Execute the necessary ATPX function to power down/up the discrete GPU
465 * Returns 0 on success, error on failure.
467 static int amdgpu_atpx_power_state(enum vga_switcheroo_client_id id,
468 enum vga_switcheroo_state state)
470 /* on w500 ACPI can't change intel gpu state */
471 if (id == VGA_SWITCHEROO_IGD)
474 amdgpu_atpx_set_discrete_state(&amdgpu_atpx_priv.atpx, state);
479 * amdgpu_atpx_pci_probe_handle - look up the ATPX handle
483 * Look up the ATPX handles (all asics).
484 * Returns true if the handles are found, false if not.
486 static bool amdgpu_atpx_pci_probe_handle(struct pci_dev *pdev)
488 acpi_handle dhandle, atpx_handle;
491 dhandle = ACPI_HANDLE(&pdev->dev);
495 status = acpi_get_handle(dhandle, "ATPX", &atpx_handle);
496 if (ACPI_FAILURE(status)) {
497 amdgpu_atpx_priv.other_handle = dhandle;
500 amdgpu_atpx_priv.dhandle = dhandle;
501 amdgpu_atpx_priv.atpx.handle = atpx_handle;
506 * amdgpu_atpx_init - verify the ATPX interface
508 * Verify the ATPX interface (all asics).
509 * Returns 0 on success, error on failure.
511 static int amdgpu_atpx_init(void)
515 /* set up the ATPX handle */
516 r = amdgpu_atpx_verify_interface(&amdgpu_atpx_priv.atpx);
520 /* validate the atpx setup */
521 r = amdgpu_atpx_validate(&amdgpu_atpx_priv.atpx);
529 * amdgpu_atpx_get_client_id - get the client id
533 * look up whether we are the integrated or discrete GPU (all asics).
534 * Returns the client id.
536 static int amdgpu_atpx_get_client_id(struct pci_dev *pdev)
538 if (amdgpu_atpx_priv.dhandle == ACPI_HANDLE(&pdev->dev))
539 return VGA_SWITCHEROO_IGD;
541 return VGA_SWITCHEROO_DIS;
544 static const struct vga_switcheroo_handler amdgpu_atpx_handler = {
545 .switchto = amdgpu_atpx_switchto,
546 .power_state = amdgpu_atpx_power_state,
547 .get_client_id = amdgpu_atpx_get_client_id,
551 * amdgpu_atpx_detect - detect whether we have PX
553 * Check if we have a PX system (all asics).
554 * Returns true if we have a PX system, false if not.
556 static bool amdgpu_atpx_detect(void)
558 char acpi_method_name[255] = { 0 };
559 struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
560 struct pci_dev *pdev = NULL;
561 bool has_atpx = false;
563 bool d3_supported = false;
564 struct pci_dev *parent_pdev;
566 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
569 has_atpx |= (amdgpu_atpx_pci_probe_handle(pdev) == true);
571 parent_pdev = pci_upstream_bridge(pdev);
572 d3_supported |= parent_pdev && parent_pdev->bridge_d3;
575 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_OTHER << 8, pdev)) != NULL) {
578 has_atpx |= (amdgpu_atpx_pci_probe_handle(pdev) == true);
580 parent_pdev = pci_upstream_bridge(pdev);
581 d3_supported |= parent_pdev && parent_pdev->bridge_d3;
584 if (has_atpx && vga_count == 2) {
585 acpi_get_name(amdgpu_atpx_priv.atpx.handle, ACPI_FULL_PATHNAME, &buffer);
586 pr_info("vga_switcheroo: detected switching method %s handle\n",
588 amdgpu_atpx_priv.atpx_detected = true;
589 amdgpu_atpx_priv.bridge_pm_usable = d3_supported;
597 * amdgpu_register_atpx_handler - register with vga_switcheroo
599 * Register the PX callbacks with vga_switcheroo (all asics).
601 void amdgpu_register_atpx_handler(void)
604 enum vga_switcheroo_handler_flags_t handler_flags = 0;
606 /* detect if we have any ATPX + 2 VGA in the system */
607 r = amdgpu_atpx_detect();
611 vga_switcheroo_register_handler(&amdgpu_atpx_handler, handler_flags);
615 * amdgpu_unregister_atpx_handler - unregister with vga_switcheroo
617 * Unregister the PX callbacks with vga_switcheroo (all asics).
619 void amdgpu_unregister_atpx_handler(void)
621 vga_switcheroo_unregister_handler();