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>
16 struct amdgpu_atpx_functions
{
23 bool disp_connectors_mapping
;
24 bool disp_detetion_ports
;
29 struct amdgpu_atpx_functions functions
;
32 static struct amdgpu_atpx_priv
{
34 /* handle for device - and atpx */
36 acpi_handle other_handle
;
37 struct amdgpu_atpx atpx
;
40 struct atpx_verify_interface
{
41 u16 size
; /* structure size in bytes (includes size field) */
42 u16 version
; /* version */
43 u32 function_bits
; /* supported functions bit vector */
46 struct atpx_px_params
{
47 u16 size
; /* structure size in bytes (includes size field) */
48 u32 valid_flags
; /* which flags are valid */
49 u32 flags
; /* flags */
52 struct atpx_power_control
{
62 bool amdgpu_has_atpx(void) {
63 return amdgpu_atpx_priv
.atpx_detected
;
67 * amdgpu_atpx_call - call an ATPX method
69 * @handle: acpi handle
70 * @function: the ATPX function to execute
71 * @params: ATPX function params
73 * Executes the requested ATPX function (all asics).
74 * Returns a pointer to the acpi output buffer.
76 static union acpi_object
*amdgpu_atpx_call(acpi_handle handle
, int function
,
77 struct acpi_buffer
*params
)
80 union acpi_object atpx_arg_elements
[2];
81 struct acpi_object_list atpx_arg
;
82 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
85 atpx_arg
.pointer
= &atpx_arg_elements
[0];
87 atpx_arg_elements
[0].type
= ACPI_TYPE_INTEGER
;
88 atpx_arg_elements
[0].integer
.value
= function
;
91 atpx_arg_elements
[1].type
= ACPI_TYPE_BUFFER
;
92 atpx_arg_elements
[1].buffer
.length
= params
->length
;
93 atpx_arg_elements
[1].buffer
.pointer
= params
->pointer
;
95 /* We need a second fake parameter */
96 atpx_arg_elements
[1].type
= ACPI_TYPE_INTEGER
;
97 atpx_arg_elements
[1].integer
.value
= 0;
100 status
= acpi_evaluate_object(handle
, NULL
, &atpx_arg
, &buffer
);
102 /* Fail only if calling the method fails and ATPX is supported */
103 if (ACPI_FAILURE(status
) && status
!= AE_NOT_FOUND
) {
104 printk("failed to evaluate ATPX got %s\n",
105 acpi_format_exception(status
));
106 kfree(buffer
.pointer
);
110 return buffer
.pointer
;
114 * amdgpu_atpx_parse_functions - parse supported functions
116 * @f: supported functions struct
117 * @mask: supported functions mask from ATPX
119 * Use the supported functions mask from ATPX function
120 * ATPX_FUNCTION_VERIFY_INTERFACE to determine what functions
121 * are supported (all asics).
123 static void amdgpu_atpx_parse_functions(struct amdgpu_atpx_functions
*f
, u32 mask
)
125 f
->px_params
= mask
& ATPX_GET_PX_PARAMETERS_SUPPORTED
;
126 f
->power_cntl
= mask
& ATPX_POWER_CONTROL_SUPPORTED
;
127 f
->disp_mux_cntl
= mask
& ATPX_DISPLAY_MUX_CONTROL_SUPPORTED
;
128 f
->i2c_mux_cntl
= mask
& ATPX_I2C_MUX_CONTROL_SUPPORTED
;
129 f
->switch_start
= mask
& ATPX_GRAPHICS_DEVICE_SWITCH_START_NOTIFICATION_SUPPORTED
;
130 f
->switch_end
= mask
& ATPX_GRAPHICS_DEVICE_SWITCH_END_NOTIFICATION_SUPPORTED
;
131 f
->disp_connectors_mapping
= mask
& ATPX_GET_DISPLAY_CONNECTORS_MAPPING_SUPPORTED
;
132 f
->disp_detetion_ports
= mask
& ATPX_GET_DISPLAY_DETECTION_PORTS_SUPPORTED
;
136 * amdgpu_atpx_validate_functions - validate ATPX functions
138 * @atpx: amdgpu atpx struct
140 * Validate that required functions are enabled (all asics).
141 * returns 0 on success, error on failure.
143 static int amdgpu_atpx_validate(struct amdgpu_atpx
*atpx
)
145 /* make sure required functions are enabled */
146 /* dGPU power control is required */
147 if (atpx
->functions
.power_cntl
== false) {
148 printk("ATPX dGPU power cntl not present, forcing\n");
149 atpx
->functions
.power_cntl
= true;
152 if (atpx
->functions
.px_params
) {
153 union acpi_object
*info
;
154 struct atpx_px_params output
;
158 info
= amdgpu_atpx_call(atpx
->handle
, ATPX_FUNCTION_GET_PX_PARAMETERS
, NULL
);
162 memset(&output
, 0, sizeof(output
));
164 size
= *(u16
*) info
->buffer
.pointer
;
166 printk("ATPX buffer is too small: %zu\n", size
);
170 size
= min(sizeof(output
), size
);
172 memcpy(&output
, info
->buffer
.pointer
, size
);
174 valid_bits
= output
.flags
& output
.valid_flags
;
175 /* if separate mux flag is set, mux controls are required */
176 if (valid_bits
& ATPX_SEPARATE_MUX_FOR_I2C
) {
177 atpx
->functions
.i2c_mux_cntl
= true;
178 atpx
->functions
.disp_mux_cntl
= true;
180 /* if any outputs are muxed, mux controls are required */
181 if (valid_bits
& (ATPX_CRT1_RGB_SIGNAL_MUXED
|
182 ATPX_TV_SIGNAL_MUXED
|
183 ATPX_DFP_SIGNAL_MUXED
))
184 atpx
->functions
.disp_mux_cntl
= true;
192 * amdgpu_atpx_verify_interface - verify ATPX
194 * @atpx: amdgpu atpx struct
196 * Execute the ATPX_FUNCTION_VERIFY_INTERFACE ATPX function
197 * to initialize ATPX and determine what features are supported
199 * returns 0 on success, error on failure.
201 static int amdgpu_atpx_verify_interface(struct amdgpu_atpx
*atpx
)
203 union acpi_object
*info
;
204 struct atpx_verify_interface output
;
208 info
= amdgpu_atpx_call(atpx
->handle
, ATPX_FUNCTION_VERIFY_INTERFACE
, NULL
);
212 memset(&output
, 0, sizeof(output
));
214 size
= *(u16
*) info
->buffer
.pointer
;
216 printk("ATPX buffer is too small: %zu\n", size
);
220 size
= min(sizeof(output
), size
);
222 memcpy(&output
, info
->buffer
.pointer
, size
);
224 /* TODO: check version? */
225 printk("ATPX version %u, functions 0x%08x\n",
226 output
.version
, output
.function_bits
);
228 amdgpu_atpx_parse_functions(&atpx
->functions
, output
.function_bits
);
236 * amdgpu_atpx_set_discrete_state - power up/down discrete GPU
238 * @atpx: atpx info struct
239 * @state: discrete GPU state (0 = power down, 1 = power up)
241 * Execute the ATPX_FUNCTION_POWER_CONTROL ATPX function to
242 * power down/up the discrete GPU (all asics).
243 * Returns 0 on success, error on failure.
245 static int amdgpu_atpx_set_discrete_state(struct amdgpu_atpx
*atpx
, u8 state
)
247 struct acpi_buffer params
;
248 union acpi_object
*info
;
249 struct atpx_power_control input
;
251 if (atpx
->functions
.power_cntl
) {
253 input
.dgpu_state
= state
;
254 params
.length
= input
.size
;
255 params
.pointer
= &input
;
256 info
= amdgpu_atpx_call(atpx
->handle
,
257 ATPX_FUNCTION_POWER_CONTROL
,
267 * amdgpu_atpx_switch_disp_mux - switch display mux
269 * @atpx: atpx info struct
270 * @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU)
272 * Execute the ATPX_FUNCTION_DISPLAY_MUX_CONTROL ATPX function to
273 * switch the display mux between the discrete GPU and integrated GPU
275 * Returns 0 on success, error on failure.
277 static int amdgpu_atpx_switch_disp_mux(struct amdgpu_atpx
*atpx
, u16 mux_id
)
279 struct acpi_buffer params
;
280 union acpi_object
*info
;
281 struct atpx_mux input
;
283 if (atpx
->functions
.disp_mux_cntl
) {
286 params
.length
= input
.size
;
287 params
.pointer
= &input
;
288 info
= amdgpu_atpx_call(atpx
->handle
,
289 ATPX_FUNCTION_DISPLAY_MUX_CONTROL
,
299 * amdgpu_atpx_switch_i2c_mux - switch i2c/hpd mux
301 * @atpx: atpx info struct
302 * @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU)
304 * Execute the ATPX_FUNCTION_I2C_MUX_CONTROL ATPX function to
305 * switch the i2c/hpd mux between the discrete GPU and integrated GPU
307 * Returns 0 on success, error on failure.
309 static int amdgpu_atpx_switch_i2c_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
.i2c_mux_cntl
) {
318 params
.length
= input
.size
;
319 params
.pointer
= &input
;
320 info
= amdgpu_atpx_call(atpx
->handle
,
321 ATPX_FUNCTION_I2C_MUX_CONTROL
,
331 * amdgpu_atpx_switch_start - notify the sbios of a GPU switch
333 * @atpx: atpx info struct
334 * @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU)
336 * Execute the ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_START_NOTIFICATION ATPX
337 * function to notify the sbios that a switch between the discrete GPU and
338 * integrated GPU has begun (all asics).
339 * Returns 0 on success, error on failure.
341 static int amdgpu_atpx_switch_start(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
.switch_start
) {
350 params
.length
= input
.size
;
351 params
.pointer
= &input
;
352 info
= amdgpu_atpx_call(atpx
->handle
,
353 ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_START_NOTIFICATION
,
363 * amdgpu_atpx_switch_end - 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_END_NOTIFICATION ATPX
369 * function to notify the sbios that a switch between the discrete GPU and
370 * integrated GPU has ended (all asics).
371 * Returns 0 on success, error on failure.
373 static int amdgpu_atpx_switch_end(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_end
) {
382 params
.length
= input
.size
;
383 params
.pointer
= &input
;
384 info
= amdgpu_atpx_call(atpx
->handle
,
385 ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_END_NOTIFICATION
,
395 * amdgpu_atpx_switchto - switch to the requested GPU
397 * @id: GPU to switch to
399 * Execute the necessary ATPX functions to switch between the discrete GPU and
400 * integrated GPU (all asics).
401 * Returns 0 on success, error on failure.
403 static int amdgpu_atpx_switchto(enum vga_switcheroo_client_id id
)
407 if (id
== VGA_SWITCHEROO_IGD
)
408 gpu_id
= ATPX_INTEGRATED_GPU
;
410 gpu_id
= ATPX_DISCRETE_GPU
;
412 amdgpu_atpx_switch_start(&amdgpu_atpx_priv
.atpx
, gpu_id
);
413 amdgpu_atpx_switch_disp_mux(&amdgpu_atpx_priv
.atpx
, gpu_id
);
414 amdgpu_atpx_switch_i2c_mux(&amdgpu_atpx_priv
.atpx
, gpu_id
);
415 amdgpu_atpx_switch_end(&amdgpu_atpx_priv
.atpx
, gpu_id
);
421 * amdgpu_atpx_power_state - power down/up the requested GPU
423 * @id: GPU to power down/up
424 * @state: requested power state (0 = off, 1 = on)
426 * Execute the necessary ATPX function to power down/up the discrete GPU
428 * Returns 0 on success, error on failure.
430 static int amdgpu_atpx_power_state(enum vga_switcheroo_client_id id
,
431 enum vga_switcheroo_state state
)
433 /* on w500 ACPI can't change intel gpu state */
434 if (id
== VGA_SWITCHEROO_IGD
)
437 amdgpu_atpx_set_discrete_state(&amdgpu_atpx_priv
.atpx
, state
);
442 * amdgpu_atpx_pci_probe_handle - look up the ATPX handle
446 * Look up the ATPX handles (all asics).
447 * Returns true if the handles are found, false if not.
449 static bool amdgpu_atpx_pci_probe_handle(struct pci_dev
*pdev
)
451 acpi_handle dhandle
, atpx_handle
;
454 dhandle
= ACPI_HANDLE(&pdev
->dev
);
458 status
= acpi_get_handle(dhandle
, "ATPX", &atpx_handle
);
459 if (ACPI_FAILURE(status
)) {
460 amdgpu_atpx_priv
.other_handle
= dhandle
;
463 amdgpu_atpx_priv
.dhandle
= dhandle
;
464 amdgpu_atpx_priv
.atpx
.handle
= atpx_handle
;
469 * amdgpu_atpx_init - verify the ATPX interface
471 * Verify the ATPX interface (all asics).
472 * Returns 0 on success, error on failure.
474 static int amdgpu_atpx_init(void)
478 /* set up the ATPX handle */
479 r
= amdgpu_atpx_verify_interface(&amdgpu_atpx_priv
.atpx
);
483 /* validate the atpx setup */
484 r
= amdgpu_atpx_validate(&amdgpu_atpx_priv
.atpx
);
492 * amdgpu_atpx_get_client_id - get the client id
496 * look up whether we are the integrated or discrete GPU (all asics).
497 * Returns the client id.
499 static int amdgpu_atpx_get_client_id(struct pci_dev
*pdev
)
501 if (amdgpu_atpx_priv
.dhandle
== ACPI_HANDLE(&pdev
->dev
))
502 return VGA_SWITCHEROO_IGD
;
504 return VGA_SWITCHEROO_DIS
;
507 static const struct vga_switcheroo_handler amdgpu_atpx_handler
= {
508 .switchto
= amdgpu_atpx_switchto
,
509 .power_state
= amdgpu_atpx_power_state
,
510 .init
= amdgpu_atpx_init
,
511 .get_client_id
= amdgpu_atpx_get_client_id
,
515 * amdgpu_atpx_detect - detect whether we have PX
517 * Check if we have a PX system (all asics).
518 * Returns true if we have a PX system, false if not.
520 static bool amdgpu_atpx_detect(void)
522 char acpi_method_name
[255] = { 0 };
523 struct acpi_buffer buffer
= {sizeof(acpi_method_name
), acpi_method_name
};
524 struct pci_dev
*pdev
= NULL
;
525 bool has_atpx
= false;
528 while ((pdev
= pci_get_class(PCI_CLASS_DISPLAY_VGA
<< 8, pdev
)) != NULL
) {
531 has_atpx
|= (amdgpu_atpx_pci_probe_handle(pdev
) == true);
534 while ((pdev
= pci_get_class(PCI_CLASS_DISPLAY_OTHER
<< 8, pdev
)) != NULL
) {
537 has_atpx
|= (amdgpu_atpx_pci_probe_handle(pdev
) == true);
540 if (has_atpx
&& vga_count
== 2) {
541 acpi_get_name(amdgpu_atpx_priv
.atpx
.handle
, ACPI_FULL_PATHNAME
, &buffer
);
542 printk(KERN_INFO
"vga_switcheroo: detected switching method %s handle\n",
544 amdgpu_atpx_priv
.atpx_detected
= true;
551 * amdgpu_register_atpx_handler - register with vga_switcheroo
553 * Register the PX callbacks with vga_switcheroo (all asics).
555 void amdgpu_register_atpx_handler(void)
558 enum vga_switcheroo_handler_flags_t handler_flags
= 0;
560 /* detect if we have any ATPX + 2 VGA in the system */
561 r
= amdgpu_atpx_detect();
565 vga_switcheroo_register_handler(&amdgpu_atpx_handler
, handler_flags
);
569 * amdgpu_unregister_atpx_handler - unregister with vga_switcheroo
571 * Unregister the PX callbacks with vga_switcheroo (all asics).
573 void amdgpu_unregister_atpx_handler(void)
575 vga_switcheroo_unregister_handler();