drivers/gpu/drm/nouveau/nouveau_acpi.c

   1 #include <linux/pci.h>
   2 #include <linux/acpi.h>
   3 #include <linux/slab.h>
   4 #include <linux/mxm-wmi.h>
   5 #include <linux/vga_switcheroo.h>
   6 #include <drm/drm_edid.h>
   7 #include <acpi/video.h>
   8
   9 #include "nouveau_drv.h"
  10 #include "nouveau_acpi.h"
  11
  12 #define NOUVEAU_DSM_LED 0x02
  13 #define NOUVEAU_DSM_LED_STATE 0x00
  14 #define NOUVEAU_DSM_LED_OFF 0x10
  15 #define NOUVEAU_DSM_LED_STAMINA 0x11
  16 #define NOUVEAU_DSM_LED_SPEED 0x12
  17
  18 #define NOUVEAU_DSM_POWER 0x03
  19 #define NOUVEAU_DSM_POWER_STATE 0x00
  20 #define NOUVEAU_DSM_POWER_SPEED 0x01
  21 #define NOUVEAU_DSM_POWER_STAMINA 0x02
  22
  23 #define NOUVEAU_DSM_OPTIMUS_CAPS 0x1A
  24 #define NOUVEAU_DSM_OPTIMUS_FLAGS 0x1B
  25
  26 #define NOUVEAU_DSM_OPTIMUS_POWERDOWN_PS3 (3 << 24)
  27 #define NOUVEAU_DSM_OPTIMUS_NO_POWERDOWN_PS3 (2 << 24)
  28 #define NOUVEAU_DSM_OPTIMUS_FLAGS_CHANGED (1)
  29
  30 #define NOUVEAU_DSM_OPTIMUS_SET_POWERDOWN (NOUVEAU_DSM_OPTIMUS_POWERDOWN_PS3 | NOUVEAU_DSM_OPTIMUS_FLAGS_CHANGED)
  31
  32 /* result of the optimus caps function */
  33 #define OPTIMUS_ENABLED (1 << 0)
  34 #define OPTIMUS_STATUS_MASK (3 << 3)
  35 #define OPTIMUS_STATUS_OFF  (0 << 3)
  36 #define OPTIMUS_STATUS_ON_ENABLED  (1 << 3)
  37 #define OPTIMUS_STATUS_PWR_STABLE  (3 << 3)
  38 #define OPTIMUS_DISPLAY_HOTPLUG (1 << 6)
  39 #define OPTIMUS_CAPS_MASK (7 << 24)
  40 #define OPTIMUS_DYNAMIC_PWR_CAP (1 << 24)
  41
  42 #define OPTIMUS_AUDIO_CAPS_MASK (3 << 27)
  43 #define OPTIMUS_HDA_CODEC_MASK (2 << 27) /* hda bios control */
  44
  45 static struct nouveau_dsm_priv {
  46         bool dsm_detected;
  47         bool optimus_detected;
  48         bool optimus_flags_detected;
  49         bool optimus_skip_dsm;
  50         acpi_handle dhandle;
  51         acpi_handle rom_handle;
  52 } nouveau_dsm_priv;
  53
  54 bool nouveau_is_optimus(void) {
  55         return nouveau_dsm_priv.optimus_detected;
  56 }
  57
  58 bool nouveau_is_v1_dsm(void) {
  59         return nouveau_dsm_priv.dsm_detected;
  60 }
  61
  62 #ifdef CONFIG_VGA_SWITCHEROO
  63 static const char nouveau_dsm_muid[] = {
  64         0xA0, 0xA0, 0x95, 0x9D, 0x60, 0x00, 0x48, 0x4D,
  65         0xB3, 0x4D, 0x7E, 0x5F, 0xEA, 0x12, 0x9F, 0xD4,
  66 };
  67
  68 static const char nouveau_op_dsm_muid[] = {
  69         0xF8, 0xD8, 0x86, 0xA4, 0xDA, 0x0B, 0x1B, 0x47,
  70         0xA7, 0x2B, 0x60, 0x42, 0xA6, 0xB5, 0xBE, 0xE0,
  71 };
  72
  73 static int nouveau_optimus_dsm(acpi_handle handle, int func, int arg, uint32_t *result)
  74 {
  75         int i;
  76         union acpi_object *obj;
  77         char args_buff[4];
  78         union acpi_object argv4 = {
  79                 .buffer.type = ACPI_TYPE_BUFFER,
  80                 .buffer.length = 4,
  81                 .buffer.pointer = args_buff
  82         };
  83
  84         /* ACPI is little endian, AABBCCDD becomes {DD,CC,BB,AA} */
  85         for (i = 0; i < 4; i++)
  86                 args_buff[i] = (arg >> i * 8) & 0xFF;
  87
  88         *result = 0;
  89         obj = acpi_evaluate_dsm_typed(handle, nouveau_op_dsm_muid, 0x00000100,
  90                                       func, &argv4, ACPI_TYPE_BUFFER);
  91         if (!obj) {
  92                 acpi_handle_info(handle, "failed to evaluate _DSM\n");
  93                 return AE_ERROR;
  94         } else {
  95                 if (obj->buffer.length == 4) {
  96                         *result |= obj->buffer.pointer[0];
  97                         *result |= (obj->buffer.pointer[1] << 8);
  98                         *result |= (obj->buffer.pointer[2] << 16);
  99                         *result |= (obj->buffer.pointer[3] << 24);
 100                 }
 101                 ACPI_FREE(obj);
 102         }
 103
 104         return 0;
 105 }
 106
 107 /*
 108  * On some platforms, _DSM(nouveau_op_dsm_muid, func0) has special
 109  * requirements on the fourth parameter, so a private implementation
 110  * instead of using acpi_check_dsm().
 111  */
 112 static int nouveau_dsm_get_optimus_functions(acpi_handle handle)
 113 {
 114         int result;
 115
 116         /*
 117          * Function 0 returns a Buffer containing available functions.
 118          * The args parameter is ignored for function 0, so just put 0 in it
 119          */
 120         if (nouveau_optimus_dsm(handle, 0, 0, &result))
 121                 return 0;
 122
 123         /*
 124          * ACPI Spec v4 9.14.1: if bit 0 is zero, no function is supported.
 125          * If the n-th bit is enabled, function n is supported
 126          */
 127         if (result & 1 && result & (1 << NOUVEAU_DSM_OPTIMUS_CAPS))
 128                 return result;
 129         return 0;
 130 }
 131
 132 static int nouveau_dsm(acpi_handle handle, int func, int arg)
 133 {
 134         int ret = 0;
 135         union acpi_object *obj;
 136         union acpi_object argv4 = {
 137                 .integer.type = ACPI_TYPE_INTEGER,
 138                 .integer.value = arg,
 139         };
 140
 141         obj = acpi_evaluate_dsm_typed(handle, nouveau_dsm_muid, 0x00000102,
 142                                       func, &argv4, ACPI_TYPE_INTEGER);
 143         if (!obj) {
 144                 acpi_handle_info(handle, "failed to evaluate _DSM\n");
 145                 return AE_ERROR;
 146         } else {
 147                 if (obj->integer.value == 0x80000002)
 148                         ret = -ENODEV;
 149                 ACPI_FREE(obj);
 150         }
 151
 152         return ret;
 153 }
 154
 155 static int nouveau_dsm_switch_mux(acpi_handle handle, int mux_id)
 156 {
 157         mxm_wmi_call_mxmx(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
 158         mxm_wmi_call_mxds(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
 159         return nouveau_dsm(handle, NOUVEAU_DSM_LED, mux_id);
 160 }
 161
 162 static int nouveau_dsm_set_discrete_state(acpi_handle handle, enum vga_switcheroo_state state)
 163 {
 164         int arg;
 165         if (state == VGA_SWITCHEROO_ON)
 166                 arg = NOUVEAU_DSM_POWER_SPEED;
 167         else
 168                 arg = NOUVEAU_DSM_POWER_STAMINA;
 169         nouveau_dsm(handle, NOUVEAU_DSM_POWER, arg);
 170         return 0;
 171 }
 172
 173 static int nouveau_dsm_switchto(enum vga_switcheroo_client_id id)
 174 {
 175         if (!nouveau_dsm_priv.dsm_detected)
 176                 return 0;
 177         if (id == VGA_SWITCHEROO_IGD)
 178                 return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_STAMINA);
 179         else
 180                 return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_SPEED);
 181 }
 182
 183 static int nouveau_dsm_power_state(enum vga_switcheroo_client_id id,
 184                                    enum vga_switcheroo_state state)
 185 {
 186         if (id == VGA_SWITCHEROO_IGD)
 187                 return 0;
 188
 189         /* Optimus laptops have the card already disabled in
 190          * nouveau_switcheroo_set_state */
 191         if (!nouveau_dsm_priv.dsm_detected)
 192                 return 0;
 193
 194         return nouveau_dsm_set_discrete_state(nouveau_dsm_priv.dhandle, state);
 195 }
 196
 197 static int nouveau_dsm_get_client_id(struct pci_dev *pdev)
 198 {
 199         /* easy option one - intel vendor ID means Integrated */
 200         if (pdev->vendor == PCI_VENDOR_ID_INTEL)
 201                 return VGA_SWITCHEROO_IGD;
 202
 203         /* is this device on Bus 0? - this may need improving */
 204         if (pdev->bus->number == 0)
 205                 return VGA_SWITCHEROO_IGD;
 206
 207         return VGA_SWITCHEROO_DIS;
 208 }
 209
 210 static const struct vga_switcheroo_handler nouveau_dsm_handler = {
 211         .switchto = nouveau_dsm_switchto,
 212         .power_state = nouveau_dsm_power_state,
 213         .get_client_id = nouveau_dsm_get_client_id,
 214 };
 215
 216 /*
 217  * Firmware supporting Windows 8 or later do not use _DSM to put the device into
 218  * D3cold, they instead rely on disabling power resources on the parent.
 219  */
 220 static bool nouveau_pr3_present(struct pci_dev *pdev)
 221 {
 222         struct pci_dev *parent_pdev = pci_upstream_bridge(pdev);
 223         struct acpi_device *parent_adev;
 224
 225         if (!parent_pdev)
 226                 return false;
 227
 228         if (!parent_pdev->bridge_d3) {
 229                 /*
 230                  * Parent PCI bridge is currently not power managed.
 231                  * Since userspace can change these afterwards to be on
 232                  * the safe side we stick with _DSM and prevent usage of
 233                  * _PR3 from the bridge.
 234                  */
 235                 pci_d3cold_disable(pdev);
 236                 return false;
 237         }
 238
 239         parent_adev = ACPI_COMPANION(&parent_pdev->dev);
 240         if (!parent_adev)
 241                 return false;
 242
 243         return parent_adev->power.flags.power_resources &&
 244                 acpi_has_method(parent_adev->handle, "_PR3");
 245 }
 246
 247 static void nouveau_dsm_pci_probe(struct pci_dev *pdev, acpi_handle *dhandle_out,
 248                                   bool *has_mux, bool *has_opt,
 249                                   bool *has_opt_flags, bool *has_pr3)
 250 {
 251         acpi_handle dhandle;
 252         bool supports_mux;
 253         int optimus_funcs;
 254
 255         dhandle = ACPI_HANDLE(&pdev->dev);
 256         if (!dhandle)
 257                 return;
 258
 259         if (!acpi_has_method(dhandle, "_DSM"))
 260                 return;
 261
 262         supports_mux = acpi_check_dsm(dhandle, nouveau_dsm_muid, 0x00000102,
 263                                       1 << NOUVEAU_DSM_POWER);
 264         optimus_funcs = nouveau_dsm_get_optimus_functions(dhandle);
 265
 266         /* Does not look like a Nvidia device. */
 267         if (!supports_mux && !optimus_funcs)
 268                 return;
 269
 270         *dhandle_out = dhandle;
 271         *has_mux = supports_mux;
 272         *has_opt = !!optimus_funcs;
 273         *has_opt_flags = optimus_funcs & (1 << NOUVEAU_DSM_OPTIMUS_FLAGS);
 274         *has_pr3 = false;
 275
 276         if (optimus_funcs) {
 277                 uint32_t result;
 278                 nouveau_optimus_dsm(dhandle, NOUVEAU_DSM_OPTIMUS_CAPS, 0,
 279                                     &result);
 280                 dev_info(&pdev->dev, "optimus capabilities: %s, status %s%s\n",
 281                          (result & OPTIMUS_ENABLED) ? "enabled" : "disabled",
 282                          (result & OPTIMUS_DYNAMIC_PWR_CAP) ? "dynamic power, " : "",
 283                          (result & OPTIMUS_HDA_CODEC_MASK) ? "hda bios codec supported" : "");
 284
 285                 *has_pr3 = nouveau_pr3_present(pdev);
 286         }
 287 }
 288
 289 static bool nouveau_dsm_detect(void)
 290 {
 291         char acpi_method_name[255] = { 0 };
 292         struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
 293         struct pci_dev *pdev = NULL;
 294         acpi_handle dhandle = NULL;
 295         bool has_mux = false;
 296         bool has_optimus = false;
 297         bool has_optimus_flags = false;
 298         bool has_power_resources = false;
 299         int vga_count = 0;
 300         bool guid_valid;
 301         bool ret = false;
 302
 303         /* lookup the MXM GUID */
 304         guid_valid = mxm_wmi_supported();
 305
 306         if (guid_valid)
 307                 printk("MXM: GUID detected in BIOS\n");
 308
 309         /* now do DSM detection */
 310         while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
 311                 vga_count++;
 312
 313                 nouveau_dsm_pci_probe(pdev, &dhandle, &has_mux, &has_optimus,
 314                                       &has_optimus_flags, &has_power_resources);
 315         }
 316
 317         while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_3D << 8, pdev)) != NULL) {
 318                 vga_count++;
 319
 320                 nouveau_dsm_pci_probe(pdev, &dhandle, &has_mux, &has_optimus,
 321                                       &has_optimus_flags, &has_power_resources);
 322         }
 323
 324         /* find the optimus DSM or the old v1 DSM */
 325         if (has_optimus) {
 326                 nouveau_dsm_priv.dhandle = dhandle;
 327                 acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
 328                         &buffer);
 329                 printk(KERN_INFO "VGA switcheroo: detected Optimus DSM method %s handle\n",
 330                         acpi_method_name);
 331                 if (has_power_resources)
 332                         pr_info("nouveau: detected PR support, will not use DSM\n");
 333                 nouveau_dsm_priv.optimus_detected = true;
 334                 nouveau_dsm_priv.optimus_flags_detected = has_optimus_flags;
 335                 nouveau_dsm_priv.optimus_skip_dsm = has_power_resources;
 336                 ret = true;
 337         } else if (vga_count == 2 && has_mux && guid_valid) {
 338                 nouveau_dsm_priv.dhandle = dhandle;
 339                 acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
 340                         &buffer);
 341                 printk(KERN_INFO "VGA switcheroo: detected DSM switching method %s handle\n",
 342                         acpi_method_name);
 343                 nouveau_dsm_priv.dsm_detected = true;
 344                 ret = true;
 345         }
 346
 347
 348         return ret;
 349 }
 350
 351 void nouveau_register_dsm_handler(void)
 352 {
 353         bool r;
 354
 355         r = nouveau_dsm_detect();
 356         if (!r)
 357                 return;
 358
 359         vga_switcheroo_register_handler(&nouveau_dsm_handler, 0);
 360 }
 361
 362 /* Must be called for Optimus models before the card can be turned off */
 363 void nouveau_switcheroo_optimus_dsm(void)
 364 {
 365         u32 result = 0;
 366         if (!nouveau_dsm_priv.optimus_detected || nouveau_dsm_priv.optimus_skip_dsm)
 367                 return;
 368
 369         if (nouveau_dsm_priv.optimus_flags_detected)
 370                 nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_FLAGS,
 371                                     0x3, &result);
 372
 373         nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_CAPS,
 374                 NOUVEAU_DSM_OPTIMUS_SET_POWERDOWN, &result);
 375
 376 }
 377
 378 void nouveau_unregister_dsm_handler(void)
 379 {
 380         if (nouveau_dsm_priv.optimus_detected || nouveau_dsm_priv.dsm_detected)
 381                 vga_switcheroo_unregister_handler();
 382 }
 383 #else
 384 void nouveau_register_dsm_handler(void) {}
 385 void nouveau_unregister_dsm_handler(void) {}
 386 void nouveau_switcheroo_optimus_dsm(void) {}
 387 #endif
 388
 389 /* retrieve the ROM in 4k blocks */
 390 static int nouveau_rom_call(acpi_handle rom_handle, uint8_t *bios,
 391                             int offset, int len)
 392 {
 393         acpi_status status;
 394         union acpi_object rom_arg_elements[2], *obj;
 395         struct acpi_object_list rom_arg;
 396         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL};
 397
 398         rom_arg.count = 2;
 399         rom_arg.pointer = &rom_arg_elements[0];
 400
 401         rom_arg_elements[0].type = ACPI_TYPE_INTEGER;
 402         rom_arg_elements[0].integer.value = offset;
 403
 404         rom_arg_elements[1].type = ACPI_TYPE_INTEGER;
 405         rom_arg_elements[1].integer.value = len;
 406
 407         status = acpi_evaluate_object(rom_handle, NULL, &rom_arg, &buffer);
 408         if (ACPI_FAILURE(status)) {
 409                 printk(KERN_INFO "failed to evaluate ROM got %s\n", acpi_format_exception(status));
 410                 return -ENODEV;
 411         }
 412         obj = (union acpi_object *)buffer.pointer;
 413         len = min(len, (int)obj->buffer.length);
 414         memcpy(bios+offset, obj->buffer.pointer, len);
 415         kfree(buffer.pointer);
 416         return len;
 417 }
 418
 419 bool nouveau_acpi_rom_supported(struct device *dev)
 420 {
 421         acpi_status status;
 422         acpi_handle dhandle, rom_handle;
 423
 424         dhandle = ACPI_HANDLE(dev);
 425         if (!dhandle)
 426                 return false;
 427
 428         status = acpi_get_handle(dhandle, "_ROM", &rom_handle);
 429         if (ACPI_FAILURE(status))
 430                 return false;
 431
 432         nouveau_dsm_priv.rom_handle = rom_handle;
 433         return true;
 434 }
 435
 436 int nouveau_acpi_get_bios_chunk(uint8_t *bios, int offset, int len)
 437 {
 438         return nouveau_rom_call(nouveau_dsm_priv.rom_handle, bios, offset, len);
 439 }
 440
 441 void *
 442 nouveau_acpi_edid(struct drm_device *dev, struct drm_connector *connector)
 443 {
 444         struct acpi_device *acpidev;
 445         acpi_handle handle;
 446         int type, ret;
 447         void *edid;
 448
 449         switch (connector->connector_type) {
 450         case DRM_MODE_CONNECTOR_LVDS:
 451         case DRM_MODE_CONNECTOR_eDP:
 452                 type = ACPI_VIDEO_DISPLAY_LCD;
 453                 break;
 454         default:
 455                 return NULL;
 456         }
 457
 458         handle = ACPI_HANDLE(&dev->pdev->dev);
 459         if (!handle)
 460                 return NULL;
 461
 462         ret = acpi_bus_get_device(handle, &acpidev);
 463         if (ret)
 464                 return NULL;
 465
 466         ret = acpi_video_get_edid(acpidev, type, -1, &edid);
 467         if (ret < 0)
 468                 return NULL;
 469
 470         return kmemdup(edid, EDID_LENGTH, GFP_KERNEL);
 471 }