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>
17 struct amdgpu_atpx_functions
{
24 bool disp_connectors_mapping
;
25 bool disp_detetion_ports
;
30 struct amdgpu_atpx_functions functions
;
34 static struct amdgpu_atpx_priv
{
36 /* handle for device - and atpx */
38 acpi_handle other_handle
;
39 struct amdgpu_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 amdgpu_has_atpx(void) {
65 return amdgpu_atpx_priv
.atpx_detected
;
68 bool amdgpu_has_atpx_dgpu_power_cntl(void) {
69 return amdgpu_atpx_priv
.atpx
.functions
.power_cntl
;
72 bool amdgpu_is_atpx_hybrid(void) {
73 return amdgpu_atpx_priv
.atpx
.is_hybrid
;
77 * amdgpu_atpx_call - call an ATPX method
79 * @handle: acpi handle
80 * @function: the ATPX function to execute
81 * @params: ATPX function params
83 * Executes the requested ATPX function (all asics).
84 * Returns a pointer to the acpi output buffer.
86 static union acpi_object
*amdgpu_atpx_call(acpi_handle handle
, int function
,
87 struct acpi_buffer
*params
)
90 union acpi_object atpx_arg_elements
[2];
91 struct acpi_object_list atpx_arg
;
92 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
95 atpx_arg
.pointer
= &atpx_arg_elements
[0];
97 atpx_arg_elements
[0].type
= ACPI_TYPE_INTEGER
;
98 atpx_arg_elements
[0].integer
.value
= function
;
101 atpx_arg_elements
[1].type
= ACPI_TYPE_BUFFER
;
102 atpx_arg_elements
[1].buffer
.length
= params
->length
;
103 atpx_arg_elements
[1].buffer
.pointer
= params
->pointer
;
105 /* We need a second fake parameter */
106 atpx_arg_elements
[1].type
= ACPI_TYPE_INTEGER
;
107 atpx_arg_elements
[1].integer
.value
= 0;
110 status
= acpi_evaluate_object(handle
, NULL
, &atpx_arg
, &buffer
);
112 /* Fail only if calling the method fails and ATPX is supported */
113 if (ACPI_FAILURE(status
) && status
!= AE_NOT_FOUND
) {
114 printk("failed to evaluate ATPX got %s\n",
115 acpi_format_exception(status
));
116 kfree(buffer
.pointer
);
120 return buffer
.pointer
;
124 * amdgpu_atpx_parse_functions - parse supported functions
126 * @f: supported functions struct
127 * @mask: supported functions mask from ATPX
129 * Use the supported functions mask from ATPX function
130 * ATPX_FUNCTION_VERIFY_INTERFACE to determine what functions
131 * are supported (all asics).
133 static void amdgpu_atpx_parse_functions(struct amdgpu_atpx_functions
*f
, u32 mask
)
135 f
->px_params
= mask
& ATPX_GET_PX_PARAMETERS_SUPPORTED
;
136 f
->power_cntl
= mask
& ATPX_POWER_CONTROL_SUPPORTED
;
137 f
->disp_mux_cntl
= mask
& ATPX_DISPLAY_MUX_CONTROL_SUPPORTED
;
138 f
->i2c_mux_cntl
= mask
& ATPX_I2C_MUX_CONTROL_SUPPORTED
;
139 f
->switch_start
= mask
& ATPX_GRAPHICS_DEVICE_SWITCH_START_NOTIFICATION_SUPPORTED
;
140 f
->switch_end
= mask
& ATPX_GRAPHICS_DEVICE_SWITCH_END_NOTIFICATION_SUPPORTED
;
141 f
->disp_connectors_mapping
= mask
& ATPX_GET_DISPLAY_CONNECTORS_MAPPING_SUPPORTED
;
142 f
->disp_detetion_ports
= mask
& ATPX_GET_DISPLAY_DETECTION_PORTS_SUPPORTED
;
146 * amdgpu_atpx_validate_functions - validate ATPX functions
148 * @atpx: amdgpu atpx struct
150 * Validate that required functions are enabled (all asics).
151 * returns 0 on success, error on failure.
153 static int amdgpu_atpx_validate(struct amdgpu_atpx
*atpx
)
157 if (atpx
->functions
.px_params
) {
158 union acpi_object
*info
;
159 struct atpx_px_params output
;
162 info
= amdgpu_atpx_call(atpx
->handle
, ATPX_FUNCTION_GET_PX_PARAMETERS
, NULL
);
166 memset(&output
, 0, sizeof(output
));
168 size
= *(u16
*) info
->buffer
.pointer
;
170 printk("ATPX buffer is too small: %zu\n", size
);
174 size
= min(sizeof(output
), size
);
176 memcpy(&output
, info
->buffer
.pointer
, size
);
178 valid_bits
= output
.flags
& output
.valid_flags
;
183 /* if separate mux flag is set, mux controls are required */
184 if (valid_bits
& ATPX_SEPARATE_MUX_FOR_I2C
) {
185 atpx
->functions
.i2c_mux_cntl
= true;
186 atpx
->functions
.disp_mux_cntl
= true;
188 /* if any outputs are muxed, mux controls are required */
189 if (valid_bits
& (ATPX_CRT1_RGB_SIGNAL_MUXED
|
190 ATPX_TV_SIGNAL_MUXED
|
191 ATPX_DFP_SIGNAL_MUXED
))
192 atpx
->functions
.disp_mux_cntl
= true;
195 /* some bioses set these bits rather than flagging power_cntl as supported */
196 if (valid_bits
& (ATPX_DYNAMIC_PX_SUPPORTED
|
197 ATPX_DYNAMIC_DGPU_POWER_OFF_SUPPORTED
))
198 atpx
->functions
.power_cntl
= true;
200 atpx
->is_hybrid
= false;
201 if (valid_bits
& ATPX_MS_HYBRID_GFX_SUPPORTED
) {
202 printk("ATPX Hybrid Graphics\n");
204 /* This is a temporary hack until the D3 cold support
205 * makes it upstream. The ATPX power_control method seems
206 * to still work on even if the system should be using
207 * the new standardized hybrid D3 cold ACPI interface.
209 atpx
->functions
.power_cntl
= true;
211 atpx
->functions
.power_cntl
= false;
213 atpx
->is_hybrid
= true;
220 * amdgpu_atpx_verify_interface - verify ATPX
222 * @atpx: amdgpu atpx struct
224 * Execute the ATPX_FUNCTION_VERIFY_INTERFACE ATPX function
225 * to initialize ATPX and determine what features are supported
227 * returns 0 on success, error on failure.
229 static int amdgpu_atpx_verify_interface(struct amdgpu_atpx
*atpx
)
231 union acpi_object
*info
;
232 struct atpx_verify_interface output
;
236 info
= amdgpu_atpx_call(atpx
->handle
, ATPX_FUNCTION_VERIFY_INTERFACE
, NULL
);
240 memset(&output
, 0, sizeof(output
));
242 size
= *(u16
*) info
->buffer
.pointer
;
244 printk("ATPX buffer is too small: %zu\n", size
);
248 size
= min(sizeof(output
), size
);
250 memcpy(&output
, info
->buffer
.pointer
, size
);
252 /* TODO: check version? */
253 printk("ATPX version %u, functions 0x%08x\n",
254 output
.version
, output
.function_bits
);
256 amdgpu_atpx_parse_functions(&atpx
->functions
, output
.function_bits
);
264 * amdgpu_atpx_set_discrete_state - power up/down discrete GPU
266 * @atpx: atpx info struct
267 * @state: discrete GPU state (0 = power down, 1 = power up)
269 * Execute the ATPX_FUNCTION_POWER_CONTROL ATPX function to
270 * power down/up the discrete GPU (all asics).
271 * Returns 0 on success, error on failure.
273 static int amdgpu_atpx_set_discrete_state(struct amdgpu_atpx
*atpx
, u8 state
)
275 struct acpi_buffer params
;
276 union acpi_object
*info
;
277 struct atpx_power_control input
;
279 if (atpx
->functions
.power_cntl
) {
281 input
.dgpu_state
= state
;
282 params
.length
= input
.size
;
283 params
.pointer
= &input
;
284 info
= amdgpu_atpx_call(atpx
->handle
,
285 ATPX_FUNCTION_POWER_CONTROL
,
291 /* 200ms delay is required after off */
299 * amdgpu_atpx_switch_disp_mux - switch display mux
301 * @atpx: atpx info struct
302 * @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU)
304 * Execute the ATPX_FUNCTION_DISPLAY_MUX_CONTROL ATPX function to
305 * switch the display mux between the discrete GPU and integrated GPU
307 * Returns 0 on success, error on failure.
309 static int amdgpu_atpx_switch_disp_mux(struct amdgpu_atpx
*atpx
, u16 mux_id
)
311 struct acpi_buffer params
;
312 union acpi_object
*info
;
313 struct atpx_mux input
;
315 if (atpx
->functions
.disp_mux_cntl
) {
318 params
.length
= input
.size
;
319 params
.pointer
= &input
;
320 info
= amdgpu_atpx_call(atpx
->handle
,
321 ATPX_FUNCTION_DISPLAY_MUX_CONTROL
,
331 * amdgpu_atpx_switch_i2c_mux - switch i2c/hpd mux
333 * @atpx: atpx info struct
334 * @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU)
336 * Execute the ATPX_FUNCTION_I2C_MUX_CONTROL ATPX function to
337 * switch the i2c/hpd mux between the discrete GPU and integrated GPU
339 * Returns 0 on success, error on failure.
341 static int amdgpu_atpx_switch_i2c_mux(struct amdgpu_atpx
*atpx
, u16 mux_id
)
343 struct acpi_buffer params
;
344 union acpi_object
*info
;
345 struct atpx_mux input
;
347 if (atpx
->functions
.i2c_mux_cntl
) {
350 params
.length
= input
.size
;
351 params
.pointer
= &input
;
352 info
= amdgpu_atpx_call(atpx
->handle
,
353 ATPX_FUNCTION_I2C_MUX_CONTROL
,
363 * amdgpu_atpx_switch_start - notify the sbios of a GPU switch
365 * @atpx: atpx info struct
366 * @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU)
368 * Execute the ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_START_NOTIFICATION ATPX
369 * function to notify the sbios that a switch between the discrete GPU and
370 * integrated GPU has begun (all asics).
371 * Returns 0 on success, error on failure.
373 static int amdgpu_atpx_switch_start(struct amdgpu_atpx
*atpx
, u16 mux_id
)
375 struct acpi_buffer params
;
376 union acpi_object
*info
;
377 struct atpx_mux input
;
379 if (atpx
->functions
.switch_start
) {
382 params
.length
= input
.size
;
383 params
.pointer
= &input
;
384 info
= amdgpu_atpx_call(atpx
->handle
,
385 ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_START_NOTIFICATION
,
395 * amdgpu_atpx_switch_end - notify the sbios of a GPU switch
397 * @atpx: atpx info struct
398 * @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU)
400 * Execute the ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_END_NOTIFICATION ATPX
401 * function to notify the sbios that a switch between the discrete GPU and
402 * integrated GPU has ended (all asics).
403 * Returns 0 on success, error on failure.
405 static int amdgpu_atpx_switch_end(struct amdgpu_atpx
*atpx
, u16 mux_id
)
407 struct acpi_buffer params
;
408 union acpi_object
*info
;
409 struct atpx_mux input
;
411 if (atpx
->functions
.switch_end
) {
414 params
.length
= input
.size
;
415 params
.pointer
= &input
;
416 info
= amdgpu_atpx_call(atpx
->handle
,
417 ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_END_NOTIFICATION
,
427 * amdgpu_atpx_switchto - switch to the requested GPU
429 * @id: GPU to switch to
431 * Execute the necessary ATPX functions to switch between the discrete GPU and
432 * integrated GPU (all asics).
433 * Returns 0 on success, error on failure.
435 static int amdgpu_atpx_switchto(enum vga_switcheroo_client_id id
)
439 if (id
== VGA_SWITCHEROO_IGD
)
440 gpu_id
= ATPX_INTEGRATED_GPU
;
442 gpu_id
= ATPX_DISCRETE_GPU
;
444 amdgpu_atpx_switch_start(&amdgpu_atpx_priv
.atpx
, gpu_id
);
445 amdgpu_atpx_switch_disp_mux(&amdgpu_atpx_priv
.atpx
, gpu_id
);
446 amdgpu_atpx_switch_i2c_mux(&amdgpu_atpx_priv
.atpx
, gpu_id
);
447 amdgpu_atpx_switch_end(&amdgpu_atpx_priv
.atpx
, gpu_id
);
453 * amdgpu_atpx_power_state - power down/up the requested GPU
455 * @id: GPU to power down/up
456 * @state: requested power state (0 = off, 1 = on)
458 * Execute the necessary ATPX function to power down/up the discrete GPU
460 * Returns 0 on success, error on failure.
462 static int amdgpu_atpx_power_state(enum vga_switcheroo_client_id id
,
463 enum vga_switcheroo_state state
)
465 /* on w500 ACPI can't change intel gpu state */
466 if (id
== VGA_SWITCHEROO_IGD
)
469 amdgpu_atpx_set_discrete_state(&amdgpu_atpx_priv
.atpx
, state
);
474 * amdgpu_atpx_pci_probe_handle - look up the ATPX handle
478 * Look up the ATPX handles (all asics).
479 * Returns true if the handles are found, false if not.
481 static bool amdgpu_atpx_pci_probe_handle(struct pci_dev
*pdev
)
483 acpi_handle dhandle
, atpx_handle
;
486 dhandle
= ACPI_HANDLE(&pdev
->dev
);
490 status
= acpi_get_handle(dhandle
, "ATPX", &atpx_handle
);
491 if (ACPI_FAILURE(status
)) {
492 amdgpu_atpx_priv
.other_handle
= dhandle
;
495 amdgpu_atpx_priv
.dhandle
= dhandle
;
496 amdgpu_atpx_priv
.atpx
.handle
= atpx_handle
;
501 * amdgpu_atpx_init - verify the ATPX interface
503 * Verify the ATPX interface (all asics).
504 * Returns 0 on success, error on failure.
506 static int amdgpu_atpx_init(void)
510 /* set up the ATPX handle */
511 r
= amdgpu_atpx_verify_interface(&amdgpu_atpx_priv
.atpx
);
515 /* validate the atpx setup */
516 r
= amdgpu_atpx_validate(&amdgpu_atpx_priv
.atpx
);
524 * amdgpu_atpx_get_client_id - get the client id
528 * look up whether we are the integrated or discrete GPU (all asics).
529 * Returns the client id.
531 static int amdgpu_atpx_get_client_id(struct pci_dev
*pdev
)
533 if (amdgpu_atpx_priv
.dhandle
== ACPI_HANDLE(&pdev
->dev
))
534 return VGA_SWITCHEROO_IGD
;
536 return VGA_SWITCHEROO_DIS
;
539 static const struct vga_switcheroo_handler amdgpu_atpx_handler
= {
540 .switchto
= amdgpu_atpx_switchto
,
541 .power_state
= amdgpu_atpx_power_state
,
542 .get_client_id
= amdgpu_atpx_get_client_id
,
546 * amdgpu_atpx_detect - detect whether we have PX
548 * Check if we have a PX system (all asics).
549 * Returns true if we have a PX system, false if not.
551 static bool amdgpu_atpx_detect(void)
553 char acpi_method_name
[255] = { 0 };
554 struct acpi_buffer buffer
= {sizeof(acpi_method_name
), acpi_method_name
};
555 struct pci_dev
*pdev
= NULL
;
556 bool has_atpx
= false;
559 while ((pdev
= pci_get_class(PCI_CLASS_DISPLAY_VGA
<< 8, pdev
)) != NULL
) {
562 has_atpx
|= (amdgpu_atpx_pci_probe_handle(pdev
) == true);
565 while ((pdev
= pci_get_class(PCI_CLASS_DISPLAY_OTHER
<< 8, pdev
)) != NULL
) {
568 has_atpx
|= (amdgpu_atpx_pci_probe_handle(pdev
) == true);
571 if (has_atpx
&& vga_count
== 2) {
572 acpi_get_name(amdgpu_atpx_priv
.atpx
.handle
, ACPI_FULL_PATHNAME
, &buffer
);
573 printk(KERN_INFO
"vga_switcheroo: detected switching method %s handle\n",
575 amdgpu_atpx_priv
.atpx_detected
= true;
583 * amdgpu_register_atpx_handler - register with vga_switcheroo
585 * Register the PX callbacks with vga_switcheroo (all asics).
587 void amdgpu_register_atpx_handler(void)
590 enum vga_switcheroo_handler_flags_t handler_flags
= 0;
592 /* detect if we have any ATPX + 2 VGA in the system */
593 r
= amdgpu_atpx_detect();
597 vga_switcheroo_register_handler(&amdgpu_atpx_handler
, handler_flags
);
601 * amdgpu_unregister_atpx_handler - unregister with vga_switcheroo
603 * Unregister the PX callbacks with vga_switcheroo (all asics).
605 void amdgpu_unregister_atpx_handler(void)
607 vga_switcheroo_unregister_handler();