Alex Deucher | d38ceaf | 2015-04-20 16:55:21 -0400 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2010 Red Hat Inc. |
| 3 | * Author : Dave Airlie <airlied@redhat.com> |
| 4 | * |
| 5 | * Licensed under GPLv2 |
| 6 | * |
| 7 | * ATPX support for both Intel/ATI |
| 8 | */ |
| 9 | #include <linux/vga_switcheroo.h> |
| 10 | #include <linux/slab.h> |
| 11 | #include <linux/acpi.h> |
| 12 | #include <linux/pci.h> |
Alex Deucher | f81eb1a | 2016-06-01 12:54:33 -0400 | [diff] [blame] | 13 | #include <linux/delay.h> |
Alex Deucher | d38ceaf | 2015-04-20 16:55:21 -0400 | [diff] [blame] | 14 | |
Rex Zhu | 66dc0dd | 2015-09-18 16:35:17 +0800 | [diff] [blame] | 15 | #include "amd_acpi.h" |
Alex Deucher | d38ceaf | 2015-04-20 16:55:21 -0400 | [diff] [blame] | 16 | |
| 17 | struct amdgpu_atpx_functions { |
| 18 | bool px_params; |
| 19 | bool power_cntl; |
| 20 | bool disp_mux_cntl; |
| 21 | bool i2c_mux_cntl; |
| 22 | bool switch_start; |
| 23 | bool switch_end; |
| 24 | bool disp_connectors_mapping; |
| 25 | bool disp_detetion_ports; |
| 26 | }; |
| 27 | |
| 28 | struct amdgpu_atpx { |
| 29 | acpi_handle handle; |
| 30 | struct amdgpu_atpx_functions functions; |
Alex Deucher | 2f5af82 | 2016-06-02 09:04:01 -0400 | [diff] [blame] | 31 | bool is_hybrid; |
Alex Deucher | efc83cf | 2016-09-14 14:01:41 -0400 | [diff] [blame] | 32 | bool dgpu_req_power_for_displays; |
Alex Deucher | d38ceaf | 2015-04-20 16:55:21 -0400 | [diff] [blame] | 33 | }; |
| 34 | |
| 35 | static struct amdgpu_atpx_priv { |
| 36 | bool atpx_detected; |
Peter Wu | 1db4496 | 2016-11-23 02:22:24 +0100 | [diff] [blame] | 37 | bool bridge_pm_usable; |
Alex Deucher | d38ceaf | 2015-04-20 16:55:21 -0400 | [diff] [blame] | 38 | /* handle for device - and atpx */ |
| 39 | acpi_handle dhandle; |
| 40 | acpi_handle other_handle; |
| 41 | struct amdgpu_atpx atpx; |
| 42 | } amdgpu_atpx_priv; |
| 43 | |
| 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 */ |
| 48 | } __packed; |
| 49 | |
| 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 */ |
| 54 | } __packed; |
| 55 | |
| 56 | struct atpx_power_control { |
| 57 | u16 size; |
| 58 | u8 dgpu_state; |
| 59 | } __packed; |
| 60 | |
| 61 | struct atpx_mux { |
| 62 | u16 size; |
| 63 | u16 mux; |
| 64 | } __packed; |
| 65 | |
| 66 | bool amdgpu_has_atpx(void) { |
| 67 | return amdgpu_atpx_priv.atpx_detected; |
| 68 | } |
| 69 | |
Alex Deucher | a78fe13 | 2016-06-01 13:08:21 -0400 | [diff] [blame] | 70 | bool amdgpu_has_atpx_dgpu_power_cntl(void) { |
| 71 | return amdgpu_atpx_priv.atpx.functions.power_cntl; |
| 72 | } |
| 73 | |
Alex Deucher | 2f5af82 | 2016-06-02 09:04:01 -0400 | [diff] [blame] | 74 | bool amdgpu_is_atpx_hybrid(void) { |
| 75 | return amdgpu_atpx_priv.atpx.is_hybrid; |
| 76 | } |
| 77 | |
Alex Deucher | efc83cf | 2016-09-14 14:01:41 -0400 | [diff] [blame] | 78 | bool amdgpu_atpx_dgpu_req_power_for_displays(void) { |
| 79 | return amdgpu_atpx_priv.atpx.dgpu_req_power_for_displays; |
| 80 | } |
| 81 | |
Alex Deucher | d38ceaf | 2015-04-20 16:55:21 -0400 | [diff] [blame] | 82 | /** |
| 83 | * amdgpu_atpx_call - call an ATPX method |
| 84 | * |
| 85 | * @handle: acpi handle |
| 86 | * @function: the ATPX function to execute |
| 87 | * @params: ATPX function params |
| 88 | * |
| 89 | * Executes the requested ATPX function (all asics). |
| 90 | * Returns a pointer to the acpi output buffer. |
| 91 | */ |
| 92 | static union acpi_object *amdgpu_atpx_call(acpi_handle handle, int function, |
| 93 | struct acpi_buffer *params) |
| 94 | { |
| 95 | acpi_status status; |
| 96 | union acpi_object atpx_arg_elements[2]; |
| 97 | struct acpi_object_list atpx_arg; |
| 98 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
| 99 | |
| 100 | atpx_arg.count = 2; |
| 101 | atpx_arg.pointer = &atpx_arg_elements[0]; |
| 102 | |
| 103 | atpx_arg_elements[0].type = ACPI_TYPE_INTEGER; |
| 104 | atpx_arg_elements[0].integer.value = function; |
| 105 | |
| 106 | if (params) { |
| 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; |
| 110 | } else { |
| 111 | /* We need a second fake parameter */ |
| 112 | atpx_arg_elements[1].type = ACPI_TYPE_INTEGER; |
| 113 | atpx_arg_elements[1].integer.value = 0; |
| 114 | } |
| 115 | |
| 116 | status = acpi_evaluate_object(handle, NULL, &atpx_arg, &buffer); |
| 117 | |
| 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); |
| 123 | return NULL; |
| 124 | } |
| 125 | |
| 126 | return buffer.pointer; |
| 127 | } |
| 128 | |
| 129 | /** |
| 130 | * amdgpu_atpx_parse_functions - parse supported functions |
| 131 | * |
| 132 | * @f: supported functions struct |
| 133 | * @mask: supported functions mask from ATPX |
| 134 | * |
| 135 | * Use the supported functions mask from ATPX function |
| 136 | * ATPX_FUNCTION_VERIFY_INTERFACE to determine what functions |
| 137 | * are supported (all asics). |
| 138 | */ |
| 139 | static void amdgpu_atpx_parse_functions(struct amdgpu_atpx_functions *f, u32 mask) |
| 140 | { |
| 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; |
| 149 | } |
| 150 | |
| 151 | /** |
| 152 | * amdgpu_atpx_validate_functions - validate ATPX functions |
| 153 | * |
| 154 | * @atpx: amdgpu atpx struct |
| 155 | * |
| 156 | * Validate that required functions are enabled (all asics). |
| 157 | * returns 0 on success, error on failure. |
| 158 | */ |
| 159 | static int amdgpu_atpx_validate(struct amdgpu_atpx *atpx) |
| 160 | { |
Alex Deucher | 8d45f80 | 2016-06-01 12:42:35 -0400 | [diff] [blame] | 161 | u32 valid_bits = 0; |
Alex Deucher | e9bef45 | 2016-04-25 13:12:18 -0400 | [diff] [blame] | 162 | |
Alex Deucher | d38ceaf | 2015-04-20 16:55:21 -0400 | [diff] [blame] | 163 | if (atpx->functions.px_params) { |
| 164 | union acpi_object *info; |
| 165 | struct atpx_px_params output; |
| 166 | size_t size; |
Alex Deucher | d38ceaf | 2015-04-20 16:55:21 -0400 | [diff] [blame] | 167 | |
| 168 | info = amdgpu_atpx_call(atpx->handle, ATPX_FUNCTION_GET_PX_PARAMETERS, NULL); |
| 169 | if (!info) |
| 170 | return -EIO; |
| 171 | |
| 172 | memset(&output, 0, sizeof(output)); |
| 173 | |
| 174 | size = *(u16 *) info->buffer.pointer; |
| 175 | if (size < 10) { |
| 176 | printk("ATPX buffer is too small: %zu\n", size); |
| 177 | kfree(info); |
| 178 | return -EINVAL; |
| 179 | } |
| 180 | size = min(sizeof(output), size); |
| 181 | |
| 182 | memcpy(&output, info->buffer.pointer, size); |
| 183 | |
| 184 | valid_bits = output.flags & output.valid_flags; |
Alex Deucher | 5c61479 | 2016-06-01 12:28:13 -0400 | [diff] [blame] | 185 | |
Alex Deucher | d38ceaf | 2015-04-20 16:55:21 -0400 | [diff] [blame] | 186 | kfree(info); |
| 187 | } |
Alex Deucher | 8d45f80 | 2016-06-01 12:42:35 -0400 | [diff] [blame] | 188 | |
| 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; |
| 193 | } |
| 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; |
| 199 | |
| 200 | |
| 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; |
| 205 | |
Alex Deucher | 2f5af82 | 2016-06-02 09:04:01 -0400 | [diff] [blame] | 206 | atpx->is_hybrid = false; |
Alex Deucher | 8d45f80 | 2016-06-01 12:42:35 -0400 | [diff] [blame] | 207 | if (valid_bits & ATPX_MS_HYBRID_GFX_SUPPORTED) { |
Alex Deucher | 2f5af82 | 2016-06-02 09:04:01 -0400 | [diff] [blame] | 208 | printk("ATPX Hybrid Graphics\n"); |
Peter Wu | 1db4496 | 2016-11-23 02:22:24 +0100 | [diff] [blame] | 209 | /* |
| 210 | * Disable legacy PM methods only when pcie port PM is usable, |
| 211 | * otherwise the device might fail to power off or power on. |
| 212 | */ |
| 213 | atpx->functions.power_cntl = !amdgpu_atpx_priv.bridge_pm_usable; |
Alex Deucher | 2f5af82 | 2016-06-02 09:04:01 -0400 | [diff] [blame] | 214 | atpx->is_hybrid = true; |
Alex Deucher | 8d45f80 | 2016-06-01 12:42:35 -0400 | [diff] [blame] | 215 | } |
| 216 | |
Alex Deucher | efc83cf | 2016-09-14 14:01:41 -0400 | [diff] [blame] | 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; |
| 220 | |
Alex Deucher | d38ceaf | 2015-04-20 16:55:21 -0400 | [diff] [blame] | 221 | return 0; |
| 222 | } |
| 223 | |
| 224 | /** |
| 225 | * amdgpu_atpx_verify_interface - verify ATPX |
| 226 | * |
| 227 | * @atpx: amdgpu atpx struct |
| 228 | * |
| 229 | * Execute the ATPX_FUNCTION_VERIFY_INTERFACE ATPX function |
| 230 | * to initialize ATPX and determine what features are supported |
| 231 | * (all asics). |
| 232 | * returns 0 on success, error on failure. |
| 233 | */ |
| 234 | static int amdgpu_atpx_verify_interface(struct amdgpu_atpx *atpx) |
| 235 | { |
| 236 | union acpi_object *info; |
| 237 | struct atpx_verify_interface output; |
| 238 | size_t size; |
| 239 | int err = 0; |
| 240 | |
| 241 | info = amdgpu_atpx_call(atpx->handle, ATPX_FUNCTION_VERIFY_INTERFACE, NULL); |
| 242 | if (!info) |
| 243 | return -EIO; |
| 244 | |
| 245 | memset(&output, 0, sizeof(output)); |
| 246 | |
| 247 | size = *(u16 *) info->buffer.pointer; |
| 248 | if (size < 8) { |
| 249 | printk("ATPX buffer is too small: %zu\n", size); |
| 250 | err = -EINVAL; |
| 251 | goto out; |
| 252 | } |
| 253 | size = min(sizeof(output), size); |
| 254 | |
| 255 | memcpy(&output, info->buffer.pointer, size); |
| 256 | |
| 257 | /* TODO: check version? */ |
| 258 | printk("ATPX version %u, functions 0x%08x\n", |
| 259 | output.version, output.function_bits); |
| 260 | |
| 261 | amdgpu_atpx_parse_functions(&atpx->functions, output.function_bits); |
| 262 | |
| 263 | out: |
| 264 | kfree(info); |
| 265 | return err; |
| 266 | } |
| 267 | |
| 268 | /** |
| 269 | * amdgpu_atpx_set_discrete_state - power up/down discrete GPU |
| 270 | * |
| 271 | * @atpx: atpx info struct |
| 272 | * @state: discrete GPU state (0 = power down, 1 = power up) |
| 273 | * |
| 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. |
| 277 | */ |
| 278 | static int amdgpu_atpx_set_discrete_state(struct amdgpu_atpx *atpx, u8 state) |
| 279 | { |
| 280 | struct acpi_buffer params; |
| 281 | union acpi_object *info; |
| 282 | struct atpx_power_control input; |
| 283 | |
| 284 | if (atpx->functions.power_cntl) { |
| 285 | input.size = 3; |
| 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, |
| 291 | ¶ms); |
| 292 | if (!info) |
| 293 | return -EIO; |
| 294 | kfree(info); |
Alex Deucher | f81eb1a | 2016-06-01 12:54:33 -0400 | [diff] [blame] | 295 | |
| 296 | /* 200ms delay is required after off */ |
| 297 | if (state == 0) |
| 298 | msleep(200); |
Alex Deucher | d38ceaf | 2015-04-20 16:55:21 -0400 | [diff] [blame] | 299 | } |
| 300 | return 0; |
| 301 | } |
| 302 | |
| 303 | /** |
| 304 | * amdgpu_atpx_switch_disp_mux - switch display mux |
| 305 | * |
| 306 | * @atpx: atpx info struct |
| 307 | * @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU) |
| 308 | * |
| 309 | * Execute the ATPX_FUNCTION_DISPLAY_MUX_CONTROL ATPX function to |
| 310 | * switch the display mux between the discrete GPU and integrated GPU |
| 311 | * (all asics). |
| 312 | * Returns 0 on success, error on failure. |
| 313 | */ |
| 314 | static int amdgpu_atpx_switch_disp_mux(struct amdgpu_atpx *atpx, u16 mux_id) |
| 315 | { |
| 316 | struct acpi_buffer params; |
| 317 | union acpi_object *info; |
| 318 | struct atpx_mux input; |
| 319 | |
| 320 | if (atpx->functions.disp_mux_cntl) { |
| 321 | input.size = 4; |
| 322 | input.mux = mux_id; |
| 323 | params.length = input.size; |
| 324 | params.pointer = &input; |
| 325 | info = amdgpu_atpx_call(atpx->handle, |
| 326 | ATPX_FUNCTION_DISPLAY_MUX_CONTROL, |
| 327 | ¶ms); |
| 328 | if (!info) |
| 329 | return -EIO; |
| 330 | kfree(info); |
| 331 | } |
| 332 | return 0; |
| 333 | } |
| 334 | |
| 335 | /** |
| 336 | * amdgpu_atpx_switch_i2c_mux - switch i2c/hpd mux |
| 337 | * |
| 338 | * @atpx: atpx info struct |
| 339 | * @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU) |
| 340 | * |
| 341 | * Execute the ATPX_FUNCTION_I2C_MUX_CONTROL ATPX function to |
| 342 | * switch the i2c/hpd mux between the discrete GPU and integrated GPU |
| 343 | * (all asics). |
| 344 | * Returns 0 on success, error on failure. |
| 345 | */ |
| 346 | static int amdgpu_atpx_switch_i2c_mux(struct amdgpu_atpx *atpx, u16 mux_id) |
| 347 | { |
| 348 | struct acpi_buffer params; |
| 349 | union acpi_object *info; |
| 350 | struct atpx_mux input; |
| 351 | |
| 352 | if (atpx->functions.i2c_mux_cntl) { |
| 353 | input.size = 4; |
| 354 | input.mux = mux_id; |
| 355 | params.length = input.size; |
| 356 | params.pointer = &input; |
| 357 | info = amdgpu_atpx_call(atpx->handle, |
| 358 | ATPX_FUNCTION_I2C_MUX_CONTROL, |
| 359 | ¶ms); |
| 360 | if (!info) |
| 361 | return -EIO; |
| 362 | kfree(info); |
| 363 | } |
| 364 | return 0; |
| 365 | } |
| 366 | |
| 367 | /** |
| 368 | * amdgpu_atpx_switch_start - notify the sbios of a GPU switch |
| 369 | * |
| 370 | * @atpx: atpx info struct |
| 371 | * @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU) |
| 372 | * |
| 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. |
| 377 | */ |
| 378 | static int amdgpu_atpx_switch_start(struct amdgpu_atpx *atpx, u16 mux_id) |
| 379 | { |
| 380 | struct acpi_buffer params; |
| 381 | union acpi_object *info; |
| 382 | struct atpx_mux input; |
| 383 | |
| 384 | if (atpx->functions.switch_start) { |
| 385 | input.size = 4; |
| 386 | input.mux = mux_id; |
| 387 | params.length = input.size; |
| 388 | params.pointer = &input; |
| 389 | info = amdgpu_atpx_call(atpx->handle, |
| 390 | ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_START_NOTIFICATION, |
| 391 | ¶ms); |
| 392 | if (!info) |
| 393 | return -EIO; |
| 394 | kfree(info); |
| 395 | } |
| 396 | return 0; |
| 397 | } |
| 398 | |
| 399 | /** |
| 400 | * amdgpu_atpx_switch_end - notify the sbios of a GPU switch |
| 401 | * |
| 402 | * @atpx: atpx info struct |
| 403 | * @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU) |
| 404 | * |
| 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. |
| 409 | */ |
| 410 | static int amdgpu_atpx_switch_end(struct amdgpu_atpx *atpx, u16 mux_id) |
| 411 | { |
| 412 | struct acpi_buffer params; |
| 413 | union acpi_object *info; |
| 414 | struct atpx_mux input; |
| 415 | |
| 416 | if (atpx->functions.switch_end) { |
| 417 | input.size = 4; |
| 418 | input.mux = mux_id; |
| 419 | params.length = input.size; |
| 420 | params.pointer = &input; |
| 421 | info = amdgpu_atpx_call(atpx->handle, |
| 422 | ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_END_NOTIFICATION, |
| 423 | ¶ms); |
| 424 | if (!info) |
| 425 | return -EIO; |
| 426 | kfree(info); |
| 427 | } |
| 428 | return 0; |
| 429 | } |
| 430 | |
| 431 | /** |
| 432 | * amdgpu_atpx_switchto - switch to the requested GPU |
| 433 | * |
| 434 | * @id: GPU to switch to |
| 435 | * |
| 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. |
| 439 | */ |
| 440 | static int amdgpu_atpx_switchto(enum vga_switcheroo_client_id id) |
| 441 | { |
| 442 | u16 gpu_id; |
| 443 | |
| 444 | if (id == VGA_SWITCHEROO_IGD) |
| 445 | gpu_id = ATPX_INTEGRATED_GPU; |
| 446 | else |
| 447 | gpu_id = ATPX_DISCRETE_GPU; |
| 448 | |
| 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); |
| 453 | |
| 454 | return 0; |
| 455 | } |
| 456 | |
| 457 | /** |
| 458 | * amdgpu_atpx_power_state - power down/up the requested GPU |
| 459 | * |
| 460 | * @id: GPU to power down/up |
| 461 | * @state: requested power state (0 = off, 1 = on) |
| 462 | * |
| 463 | * Execute the necessary ATPX function to power down/up the discrete GPU |
| 464 | * (all asics). |
| 465 | * Returns 0 on success, error on failure. |
| 466 | */ |
| 467 | static int amdgpu_atpx_power_state(enum vga_switcheroo_client_id id, |
| 468 | enum vga_switcheroo_state state) |
| 469 | { |
| 470 | /* on w500 ACPI can't change intel gpu state */ |
| 471 | if (id == VGA_SWITCHEROO_IGD) |
| 472 | return 0; |
| 473 | |
| 474 | amdgpu_atpx_set_discrete_state(&amdgpu_atpx_priv.atpx, state); |
| 475 | return 0; |
| 476 | } |
| 477 | |
| 478 | /** |
| 479 | * amdgpu_atpx_pci_probe_handle - look up the ATPX handle |
| 480 | * |
| 481 | * @pdev: pci device |
| 482 | * |
| 483 | * Look up the ATPX handles (all asics). |
| 484 | * Returns true if the handles are found, false if not. |
| 485 | */ |
| 486 | static bool amdgpu_atpx_pci_probe_handle(struct pci_dev *pdev) |
| 487 | { |
| 488 | acpi_handle dhandle, atpx_handle; |
| 489 | acpi_status status; |
| 490 | |
| 491 | dhandle = ACPI_HANDLE(&pdev->dev); |
| 492 | if (!dhandle) |
| 493 | return false; |
| 494 | |
| 495 | status = acpi_get_handle(dhandle, "ATPX", &atpx_handle); |
| 496 | if (ACPI_FAILURE(status)) { |
| 497 | amdgpu_atpx_priv.other_handle = dhandle; |
| 498 | return false; |
| 499 | } |
| 500 | amdgpu_atpx_priv.dhandle = dhandle; |
| 501 | amdgpu_atpx_priv.atpx.handle = atpx_handle; |
| 502 | return true; |
| 503 | } |
| 504 | |
| 505 | /** |
| 506 | * amdgpu_atpx_init - verify the ATPX interface |
| 507 | * |
| 508 | * Verify the ATPX interface (all asics). |
| 509 | * Returns 0 on success, error on failure. |
| 510 | */ |
| 511 | static int amdgpu_atpx_init(void) |
| 512 | { |
| 513 | int r; |
| 514 | |
| 515 | /* set up the ATPX handle */ |
| 516 | r = amdgpu_atpx_verify_interface(&amdgpu_atpx_priv.atpx); |
| 517 | if (r) |
| 518 | return r; |
| 519 | |
| 520 | /* validate the atpx setup */ |
| 521 | r = amdgpu_atpx_validate(&amdgpu_atpx_priv.atpx); |
| 522 | if (r) |
| 523 | return r; |
| 524 | |
| 525 | return 0; |
| 526 | } |
| 527 | |
| 528 | /** |
| 529 | * amdgpu_atpx_get_client_id - get the client id |
| 530 | * |
| 531 | * @pdev: pci device |
| 532 | * |
| 533 | * look up whether we are the integrated or discrete GPU (all asics). |
| 534 | * Returns the client id. |
| 535 | */ |
| 536 | static int amdgpu_atpx_get_client_id(struct pci_dev *pdev) |
| 537 | { |
| 538 | if (amdgpu_atpx_priv.dhandle == ACPI_HANDLE(&pdev->dev)) |
| 539 | return VGA_SWITCHEROO_IGD; |
| 540 | else |
| 541 | return VGA_SWITCHEROO_DIS; |
| 542 | } |
| 543 | |
Lukas Wunner | 5d17013 | 2015-10-18 13:05:40 +0200 | [diff] [blame] | 544 | static const struct vga_switcheroo_handler amdgpu_atpx_handler = { |
Alex Deucher | d38ceaf | 2015-04-20 16:55:21 -0400 | [diff] [blame] | 545 | .switchto = amdgpu_atpx_switchto, |
| 546 | .power_state = amdgpu_atpx_power_state, |
Alex Deucher | d38ceaf | 2015-04-20 16:55:21 -0400 | [diff] [blame] | 547 | .get_client_id = amdgpu_atpx_get_client_id, |
| 548 | }; |
| 549 | |
| 550 | /** |
| 551 | * amdgpu_atpx_detect - detect whether we have PX |
| 552 | * |
| 553 | * Check if we have a PX system (all asics). |
| 554 | * Returns true if we have a PX system, false if not. |
| 555 | */ |
| 556 | static bool amdgpu_atpx_detect(void) |
| 557 | { |
| 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; |
| 562 | int vga_count = 0; |
Peter Wu | 7ac33e4 | 2016-11-26 15:05:01 +0100 | [diff] [blame] | 563 | bool d3_supported = false; |
| 564 | struct pci_dev *parent_pdev; |
Alex Deucher | d38ceaf | 2015-04-20 16:55:21 -0400 | [diff] [blame] | 565 | |
| 566 | while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) { |
| 567 | vga_count++; |
| 568 | |
| 569 | has_atpx |= (amdgpu_atpx_pci_probe_handle(pdev) == true); |
Peter Wu | 7ac33e4 | 2016-11-26 15:05:01 +0100 | [diff] [blame] | 570 | |
| 571 | parent_pdev = pci_upstream_bridge(pdev); |
| 572 | d3_supported |= parent_pdev && parent_pdev->bridge_d3; |
Alex Deucher | d38ceaf | 2015-04-20 16:55:21 -0400 | [diff] [blame] | 573 | } |
| 574 | |
| 575 | while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_OTHER << 8, pdev)) != NULL) { |
| 576 | vga_count++; |
| 577 | |
| 578 | has_atpx |= (amdgpu_atpx_pci_probe_handle(pdev) == true); |
Peter Wu | 7ac33e4 | 2016-11-26 15:05:01 +0100 | [diff] [blame] | 579 | |
| 580 | parent_pdev = pci_upstream_bridge(pdev); |
| 581 | d3_supported |= parent_pdev && parent_pdev->bridge_d3; |
Alex Deucher | d38ceaf | 2015-04-20 16:55:21 -0400 | [diff] [blame] | 582 | } |
| 583 | |
| 584 | if (has_atpx && vga_count == 2) { |
| 585 | acpi_get_name(amdgpu_atpx_priv.atpx.handle, ACPI_FULL_PATHNAME, &buffer); |
Lukas Wunner | 1694467 | 2015-09-05 11:17:35 +0200 | [diff] [blame] | 586 | printk(KERN_INFO "vga_switcheroo: detected switching method %s handle\n", |
Alex Deucher | d38ceaf | 2015-04-20 16:55:21 -0400 | [diff] [blame] | 587 | acpi_method_name); |
| 588 | amdgpu_atpx_priv.atpx_detected = true; |
Peter Wu | 7ac33e4 | 2016-11-26 15:05:01 +0100 | [diff] [blame] | 589 | amdgpu_atpx_priv.bridge_pm_usable = d3_supported; |
Alex Deucher | 6b1095e | 2016-07-27 14:52:35 -0400 | [diff] [blame] | 590 | amdgpu_atpx_init(); |
Alex Deucher | d38ceaf | 2015-04-20 16:55:21 -0400 | [diff] [blame] | 591 | return true; |
| 592 | } |
| 593 | return false; |
| 594 | } |
| 595 | |
| 596 | /** |
| 597 | * amdgpu_register_atpx_handler - register with vga_switcheroo |
| 598 | * |
| 599 | * Register the PX callbacks with vga_switcheroo (all asics). |
| 600 | */ |
| 601 | void amdgpu_register_atpx_handler(void) |
| 602 | { |
| 603 | bool r; |
Lukas Wunner | 156d7d4 | 2016-01-11 20:09:20 +0100 | [diff] [blame] | 604 | enum vga_switcheroo_handler_flags_t handler_flags = 0; |
Alex Deucher | d38ceaf | 2015-04-20 16:55:21 -0400 | [diff] [blame] | 605 | |
| 606 | /* detect if we have any ATPX + 2 VGA in the system */ |
| 607 | r = amdgpu_atpx_detect(); |
| 608 | if (!r) |
| 609 | return; |
| 610 | |
Lukas Wunner | 156d7d4 | 2016-01-11 20:09:20 +0100 | [diff] [blame] | 611 | vga_switcheroo_register_handler(&amdgpu_atpx_handler, handler_flags); |
Alex Deucher | d38ceaf | 2015-04-20 16:55:21 -0400 | [diff] [blame] | 612 | } |
| 613 | |
| 614 | /** |
| 615 | * amdgpu_unregister_atpx_handler - unregister with vga_switcheroo |
| 616 | * |
| 617 | * Unregister the PX callbacks with vga_switcheroo (all asics). |
| 618 | */ |
| 619 | void amdgpu_unregister_atpx_handler(void) |
| 620 | { |
| 621 | vga_switcheroo_unregister_handler(); |
| 622 | } |