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 <acpi/acpi.h>
12 #include <acpi/acpi_bus.h>
13 #include <linux/pci.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
;
33 static struct radeon_atpx_priv
{
35 /* handle for device - and atpx */
37 struct radeon_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
{
63 * radeon_atpx_call - call an ATPX method
65 * @handle: acpi handle
66 * @function: the ATPX function to execute
67 * @params: ATPX function params
69 * Executes the requested ATPX function (all asics).
70 * Returns a pointer to the acpi output buffer.
72 static union acpi_object
*radeon_atpx_call(acpi_handle handle
, int function
,
73 struct acpi_buffer
*params
)
76 union acpi_object atpx_arg_elements
[2];
77 struct acpi_object_list atpx_arg
;
78 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
81 atpx_arg
.pointer
= &atpx_arg_elements
[0];
83 atpx_arg_elements
[0].type
= ACPI_TYPE_INTEGER
;
84 atpx_arg_elements
[0].integer
.value
= function
;
87 atpx_arg_elements
[1].type
= ACPI_TYPE_BUFFER
;
88 atpx_arg_elements
[1].buffer
.length
= params
->length
;
89 atpx_arg_elements
[1].buffer
.pointer
= params
->pointer
;
91 /* We need a second fake parameter */
92 atpx_arg_elements
[1].type
= ACPI_TYPE_INTEGER
;
93 atpx_arg_elements
[1].integer
.value
= 0;
96 status
= acpi_evaluate_object(handle
, NULL
, &atpx_arg
, &buffer
);
98 /* Fail only if calling the method fails and ATPX is supported */
99 if (ACPI_FAILURE(status
) && status
!= AE_NOT_FOUND
) {
100 printk("failed to evaluate ATPX got %s\n",
101 acpi_format_exception(status
));
102 kfree(buffer
.pointer
);
106 return buffer
.pointer
;
110 * radeon_atpx_parse_functions - parse supported functions
112 * @f: supported functions struct
113 * @mask: supported functions mask from ATPX
115 * Use the supported functions mask from ATPX function
116 * ATPX_FUNCTION_VERIFY_INTERFACE to determine what functions
117 * are supported (all asics).
119 static void radeon_atpx_parse_functions(struct radeon_atpx_functions
*f
, u32 mask
)
121 f
->px_params
= mask
& ATPX_GET_PX_PARAMETERS_SUPPORTED
;
122 f
->power_cntl
= mask
& ATPX_POWER_CONTROL_SUPPORTED
;
123 f
->disp_mux_cntl
= mask
& ATPX_DISPLAY_MUX_CONTROL_SUPPORTED
;
124 f
->i2c_mux_cntl
= mask
& ATPX_I2C_MUX_CONTROL_SUPPORTED
;
125 f
->switch_start
= mask
& ATPX_GRAPHICS_DEVICE_SWITCH_START_NOTIFICATION_SUPPORTED
;
126 f
->switch_end
= mask
& ATPX_GRAPHICS_DEVICE_SWITCH_END_NOTIFICATION_SUPPORTED
;
127 f
->disp_connectors_mapping
= mask
& ATPX_GET_DISPLAY_CONNECTORS_MAPPING_SUPPORTED
;
128 f
->disp_detetion_ports
= mask
& ATPX_GET_DISPLAY_DETECTION_PORTS_SUPPORTED
;
132 * radeon_atpx_validate_functions - validate ATPX functions
134 * @atpx: radeon atpx struct
136 * Validate that required functions are enabled (all asics).
137 * returns 0 on success, error on failure.
139 static int radeon_atpx_validate(struct radeon_atpx
*atpx
)
141 /* make sure required functions are enabled */
142 /* dGPU power control is required */
143 atpx
->functions
.power_cntl
= true;
145 if (atpx
->functions
.px_params
) {
146 union acpi_object
*info
;
147 struct atpx_px_params output
;
151 info
= radeon_atpx_call(atpx
->handle
, ATPX_FUNCTION_GET_PX_PARAMETERS
, NULL
);
155 memset(&output
, 0, sizeof(output
));
157 size
= *(u16
*) info
->buffer
.pointer
;
159 printk("ATPX buffer is too small: %zu\n", size
);
163 size
= min(sizeof(output
), size
);
165 memcpy(&output
, info
->buffer
.pointer
, size
);
167 valid_bits
= output
.flags
& output
.valid_flags
;
168 /* if separate mux flag is set, mux controls are required */
169 if (valid_bits
& ATPX_SEPARATE_MUX_FOR_I2C
) {
170 atpx
->functions
.i2c_mux_cntl
= true;
171 atpx
->functions
.disp_mux_cntl
= true;
173 /* if any outputs are muxed, mux controls are required */
174 if (valid_bits
& (ATPX_CRT1_RGB_SIGNAL_MUXED
|
175 ATPX_TV_SIGNAL_MUXED
|
176 ATPX_DFP_SIGNAL_MUXED
))
177 atpx
->functions
.disp_mux_cntl
= true;
185 * radeon_atpx_verify_interface - verify ATPX
187 * @atpx: radeon atpx struct
189 * Execute the ATPX_FUNCTION_VERIFY_INTERFACE ATPX function
190 * to initialize ATPX and determine what features are supported
192 * returns 0 on success, error on failure.
194 static int radeon_atpx_verify_interface(struct radeon_atpx
*atpx
)
196 union acpi_object
*info
;
197 struct atpx_verify_interface output
;
201 info
= radeon_atpx_call(atpx
->handle
, ATPX_FUNCTION_VERIFY_INTERFACE
, NULL
);
205 memset(&output
, 0, sizeof(output
));
207 size
= *(u16
*) info
->buffer
.pointer
;
209 printk("ATPX buffer is too small: %zu\n", size
);
213 size
= min(sizeof(output
), size
);
215 memcpy(&output
, info
->buffer
.pointer
, size
);
217 /* TODO: check version? */
218 printk("ATPX version %u\n", output
.version
);
220 radeon_atpx_parse_functions(&atpx
->functions
, output
.function_bits
);
228 * radeon_atpx_set_discrete_state - power up/down discrete GPU
230 * @atpx: atpx info struct
231 * @state: discrete GPU state (0 = power down, 1 = power up)
233 * Execute the ATPX_FUNCTION_POWER_CONTROL ATPX function to
234 * power down/up the discrete GPU (all asics).
235 * Returns 0 on success, error on failure.
237 static int radeon_atpx_set_discrete_state(struct radeon_atpx
*atpx
, u8 state
)
239 struct acpi_buffer params
;
240 union acpi_object
*info
;
241 struct atpx_power_control input
;
243 if (atpx
->functions
.power_cntl
) {
245 input
.dgpu_state
= state
;
246 params
.length
= input
.size
;
247 params
.pointer
= &input
;
248 info
= radeon_atpx_call(atpx
->handle
,
249 ATPX_FUNCTION_POWER_CONTROL
,
259 * radeon_atpx_switch_disp_mux - switch display mux
261 * @atpx: atpx info struct
262 * @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU)
264 * Execute the ATPX_FUNCTION_DISPLAY_MUX_CONTROL ATPX function to
265 * switch the display mux between the discrete GPU and integrated GPU
267 * Returns 0 on success, error on failure.
269 static int radeon_atpx_switch_disp_mux(struct radeon_atpx
*atpx
, u16 mux_id
)
271 struct acpi_buffer params
;
272 union acpi_object
*info
;
273 struct atpx_mux input
;
275 if (atpx
->functions
.disp_mux_cntl
) {
278 params
.length
= input
.size
;
279 params
.pointer
= &input
;
280 info
= radeon_atpx_call(atpx
->handle
,
281 ATPX_FUNCTION_DISPLAY_MUX_CONTROL
,
291 * radeon_atpx_switch_i2c_mux - switch i2c/hpd mux
293 * @atpx: atpx info struct
294 * @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU)
296 * Execute the ATPX_FUNCTION_I2C_MUX_CONTROL ATPX function to
297 * switch the i2c/hpd mux between the discrete GPU and integrated GPU
299 * Returns 0 on success, error on failure.
301 static int radeon_atpx_switch_i2c_mux(struct radeon_atpx
*atpx
, u16 mux_id
)
303 struct acpi_buffer params
;
304 union acpi_object
*info
;
305 struct atpx_mux input
;
307 if (atpx
->functions
.i2c_mux_cntl
) {
310 params
.length
= input
.size
;
311 params
.pointer
= &input
;
312 info
= radeon_atpx_call(atpx
->handle
,
313 ATPX_FUNCTION_I2C_MUX_CONTROL
,
323 * radeon_atpx_switch_start - notify the sbios of a GPU switch
325 * @atpx: atpx info struct
326 * @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU)
328 * Execute the ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_START_NOTIFICATION ATPX
329 * function to notify the sbios that a switch between the discrete GPU and
330 * integrated GPU has begun (all asics).
331 * Returns 0 on success, error on failure.
333 static int radeon_atpx_switch_start(struct radeon_atpx
*atpx
, u16 mux_id
)
335 struct acpi_buffer params
;
336 union acpi_object
*info
;
337 struct atpx_mux input
;
339 if (atpx
->functions
.switch_start
) {
342 params
.length
= input
.size
;
343 params
.pointer
= &input
;
344 info
= radeon_atpx_call(atpx
->handle
,
345 ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_START_NOTIFICATION
,
355 * radeon_atpx_switch_end - notify the sbios of a GPU switch
357 * @atpx: atpx info struct
358 * @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU)
360 * Execute the ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_END_NOTIFICATION ATPX
361 * function to notify the sbios that a switch between the discrete GPU and
362 * integrated GPU has ended (all asics).
363 * Returns 0 on success, error on failure.
365 static int radeon_atpx_switch_end(struct radeon_atpx
*atpx
, u16 mux_id
)
367 struct acpi_buffer params
;
368 union acpi_object
*info
;
369 struct atpx_mux input
;
371 if (atpx
->functions
.switch_end
) {
374 params
.length
= input
.size
;
375 params
.pointer
= &input
;
376 info
= radeon_atpx_call(atpx
->handle
,
377 ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_END_NOTIFICATION
,
387 * radeon_atpx_switchto - switch to the requested GPU
389 * @id: GPU to switch to
391 * Execute the necessary ATPX functions to switch between the discrete GPU and
392 * integrated GPU (all asics).
393 * Returns 0 on success, error on failure.
395 static int radeon_atpx_switchto(enum vga_switcheroo_client_id id
)
399 if (id
== VGA_SWITCHEROO_IGD
)
400 gpu_id
= ATPX_INTEGRATED_GPU
;
402 gpu_id
= ATPX_DISCRETE_GPU
;
404 radeon_atpx_switch_start(&radeon_atpx_priv
.atpx
, gpu_id
);
405 radeon_atpx_switch_disp_mux(&radeon_atpx_priv
.atpx
, gpu_id
);
406 radeon_atpx_switch_i2c_mux(&radeon_atpx_priv
.atpx
, gpu_id
);
407 radeon_atpx_switch_end(&radeon_atpx_priv
.atpx
, gpu_id
);
413 * radeon_atpx_power_state - power down/up the requested GPU
415 * @id: GPU to power down/up
416 * @state: requested power state (0 = off, 1 = on)
418 * Execute the necessary ATPX function to power down/up the discrete GPU
420 * Returns 0 on success, error on failure.
422 static int radeon_atpx_power_state(enum vga_switcheroo_client_id id
,
423 enum vga_switcheroo_state state
)
425 /* on w500 ACPI can't change intel gpu state */
426 if (id
== VGA_SWITCHEROO_IGD
)
429 radeon_atpx_set_discrete_state(&radeon_atpx_priv
.atpx
, state
);
434 * radeon_atpx_pci_probe_handle - look up the ATPX handle
438 * Look up the ATPX handles (all asics).
439 * Returns true if the handles are found, false if not.
441 static bool radeon_atpx_pci_probe_handle(struct pci_dev
*pdev
)
443 acpi_handle dhandle
, atpx_handle
;
446 dhandle
= DEVICE_ACPI_HANDLE(&pdev
->dev
);
450 status
= acpi_get_handle(dhandle
, "ATPX", &atpx_handle
);
451 if (ACPI_FAILURE(status
))
454 radeon_atpx_priv
.dhandle
= dhandle
;
455 radeon_atpx_priv
.atpx
.handle
= atpx_handle
;
460 * radeon_atpx_init - verify the ATPX interface
462 * Verify the ATPX interface (all asics).
463 * Returns 0 on success, error on failure.
465 static int radeon_atpx_init(void)
469 /* set up the ATPX handle */
470 r
= radeon_atpx_verify_interface(&radeon_atpx_priv
.atpx
);
474 /* validate the atpx setup */
475 r
= radeon_atpx_validate(&radeon_atpx_priv
.atpx
);
483 * radeon_atpx_get_client_id - get the client id
487 * look up whether we are the integrated or discrete GPU (all asics).
488 * Returns the client id.
490 static int radeon_atpx_get_client_id(struct pci_dev
*pdev
)
492 if (radeon_atpx_priv
.dhandle
== DEVICE_ACPI_HANDLE(&pdev
->dev
))
493 return VGA_SWITCHEROO_IGD
;
495 return VGA_SWITCHEROO_DIS
;
498 static struct vga_switcheroo_handler radeon_atpx_handler
= {
499 .switchto
= radeon_atpx_switchto
,
500 .power_state
= radeon_atpx_power_state
,
501 .init
= radeon_atpx_init
,
502 .get_client_id
= radeon_atpx_get_client_id
,
506 * radeon_atpx_detect - detect whether we have PX
508 * Check if we have a PX system (all asics).
509 * Returns true if we have a PX system, false if not.
511 static bool radeon_atpx_detect(void)
513 char acpi_method_name
[255] = { 0 };
514 struct acpi_buffer buffer
= {sizeof(acpi_method_name
), acpi_method_name
};
515 struct pci_dev
*pdev
= NULL
;
516 bool has_atpx
= false;
519 while ((pdev
= pci_get_class(PCI_CLASS_DISPLAY_VGA
<< 8, pdev
)) != NULL
) {
522 has_atpx
|= (radeon_atpx_pci_probe_handle(pdev
) == true);
525 if (has_atpx
&& vga_count
== 2) {
526 acpi_get_name(radeon_atpx_priv
.atpx
.handle
, ACPI_FULL_PATHNAME
, &buffer
);
527 printk(KERN_INFO
"VGA switcheroo: detected switching method %s handle\n",
529 radeon_atpx_priv
.atpx_detected
= true;
536 * radeon_register_atpx_handler - register with vga_switcheroo
538 * Register the PX callbacks with vga_switcheroo (all asics).
540 void radeon_register_atpx_handler(void)
544 /* detect if we have any ATPX + 2 VGA in the system */
545 r
= radeon_atpx_detect();
549 vga_switcheroo_register_handler(&radeon_atpx_handler
);
553 * radeon_unregister_atpx_handler - unregister with vga_switcheroo
555 * Unregister the PX callbacks with vga_switcheroo (all asics).
557 void radeon_unregister_atpx_handler(void)
559 vga_switcheroo_unregister_handler();