drivers/gpu/drm/nouveau/nouveau_acpi.c

   1 #include <linux/pci.h>
   2 #include <linux/acpi.h>
   3 #include <linux/slab.h>
   4 #include <acpi/acpi_drivers.h>
   5 #include <acpi/acpi_bus.h>
   6 #include <acpi/video.h>
   7 #include <acpi/acpi.h>
   8 #include <linux/mxm-wmi.h>
   9
  10 #include <linux/vga_switcheroo.h>
  11
  12 #include <drm/drm_edid.h>
  13
  14 #include "nouveau_drm.h"
  15 #include "nouveau_acpi.h"
  16
  17 #define NOUVEAU_DSM_LED 0x02
  18 #define NOUVEAU_DSM_LED_STATE 0x00
  19 #define NOUVEAU_DSM_LED_OFF 0x10
  20 #define NOUVEAU_DSM_LED_STAMINA 0x11
  21 #define NOUVEAU_DSM_LED_SPEED 0x12
  22
  23 #define NOUVEAU_DSM_POWER 0x03
  24 #define NOUVEAU_DSM_POWER_STATE 0x00
  25 #define NOUVEAU_DSM_POWER_SPEED 0x01
  26 #define NOUVEAU_DSM_POWER_STAMINA 0x02
  27
  28 #define NOUVEAU_DSM_OPTIMUS_CAPS 0x1A
  29 #define NOUVEAU_DSM_OPTIMUS_FLAGS 0x1B
  30
  31 #define NOUVEAU_DSM_OPTIMUS_POWERDOWN_PS3 (3 << 24)
  32 #define NOUVEAU_DSM_OPTIMUS_NO_POWERDOWN_PS3 (2 << 24)
  33 #define NOUVEAU_DSM_OPTIMUS_FLAGS_CHANGED (1)
  34
  35 #define NOUVEAU_DSM_OPTIMUS_SET_POWERDOWN (NOUVEAU_DSM_OPTIMUS_POWERDOWN_PS3 | NOUVEAU_DSM_OPTIMUS_FLAGS_CHANGED)
  36
  37 /* result of the optimus caps function */
  38 #define OPTIMUS_ENABLED (1 << 0)
  39 #define OPTIMUS_STATUS_MASK (3 << 3)
  40 #define OPTIMUS_STATUS_OFF  (0 << 3)
  41 #define OPTIMUS_STATUS_ON_ENABLED  (1 << 3)
  42 #define OPTIMUS_STATUS_PWR_STABLE  (3 << 3)
  43 #define OPTIMUS_DISPLAY_HOTPLUG (1 << 6)
  44 #define OPTIMUS_CAPS_MASK (7 << 24)
  45 #define OPTIMUS_DYNAMIC_PWR_CAP (1 << 24)
  46
  47 #define OPTIMUS_AUDIO_CAPS_MASK (3 << 27)
  48 #define OPTIMUS_HDA_CODEC_MASK (2 << 27) /* hda bios control */
  49
  50 static struct nouveau_dsm_priv {
  51         bool dsm_detected;
  52         bool optimus_detected;
  53         acpi_handle dhandle;
  54         acpi_handle other_handle;
  55         acpi_handle rom_handle;
  56 } nouveau_dsm_priv;
  57
  58 bool nouveau_is_optimus(void) {
  59         return nouveau_dsm_priv.optimus_detected;
  60 }
  61
  62 bool nouveau_is_v1_dsm(void) {
  63         return nouveau_dsm_priv.dsm_detected;
  64 }
  65
  66 #define NOUVEAU_DSM_HAS_MUX 0x1
  67 #define NOUVEAU_DSM_HAS_OPT 0x2
  68
  69 #ifdef CONFIG_VGA_SWITCHEROO
  70 static const char nouveau_dsm_muid[] = {
  71         0xA0, 0xA0, 0x95, 0x9D, 0x60, 0x00, 0x48, 0x4D,
  72         0xB3, 0x4D, 0x7E, 0x5F, 0xEA, 0x12, 0x9F, 0xD4,
  73 };
  74
  75 static const char nouveau_op_dsm_muid[] = {
  76         0xF8, 0xD8, 0x86, 0xA4, 0xDA, 0x0B, 0x1B, 0x47,
  77         0xA7, 0x2B, 0x60, 0x42, 0xA6, 0xB5, 0xBE, 0xE0,
  78 };
  79
  80 static int nouveau_optimus_dsm(acpi_handle handle, int func, int arg, uint32_t *result)
  81 {
  82         struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
  83         struct acpi_object_list input;
  84         union acpi_object params[4];
  85         union acpi_object *obj;
  86         int i, err;
  87         char args_buff[4];
  88
  89         input.count = 4;
  90         input.pointer = params;
  91         params[0].type = ACPI_TYPE_BUFFER;
  92         params[0].buffer.length = sizeof(nouveau_op_dsm_muid);
  93         params[0].buffer.pointer = (char *)nouveau_op_dsm_muid;
  94         params[1].type = ACPI_TYPE_INTEGER;
  95         params[1].integer.value = 0x00000100;
  96         params[2].type = ACPI_TYPE_INTEGER;
  97         params[2].integer.value = func;
  98         params[3].type = ACPI_TYPE_BUFFER;
  99         params[3].buffer.length = 4;
 100         /* ACPI is little endian, AABBCCDD becomes {DD,CC,BB,AA} */
 101         for (i = 0; i < 4; i++)
 102                 args_buff[i] = (arg >> i * 8) & 0xFF;
 103         params[3].buffer.pointer = args_buff;
 104
 105         err = acpi_evaluate_object(handle, "_DSM", &input, &output);
 106         if (err) {
 107                 printk(KERN_INFO "failed to evaluate _DSM: %d\n", err);
 108                 return err;
 109         }
 110
 111         obj = (union acpi_object *)output.pointer;
 112
 113         if (obj->type == ACPI_TYPE_INTEGER)
 114                 if (obj->integer.value == 0x80000002) {
 115                         return -ENODEV;
 116                 }
 117
 118         if (obj->type == ACPI_TYPE_BUFFER) {
 119                 if (obj->buffer.length == 4 && result) {
 120                         *result = 0;
 121                         *result |= obj->buffer.pointer[0];
 122                         *result |= (obj->buffer.pointer[1] << 8);
 123                         *result |= (obj->buffer.pointer[2] << 16);
 124                         *result |= (obj->buffer.pointer[3] << 24);
 125                 }
 126         }
 127
 128         kfree(output.pointer);
 129         return 0;
 130 }
 131
 132 static int nouveau_dsm(acpi_handle handle, int func, int arg, uint32_t *result)
 133 {
 134         struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
 135         struct acpi_object_list input;
 136         union acpi_object params[4];
 137         union acpi_object *obj;
 138         int err;
 139
 140         input.count = 4;
 141         input.pointer = params;
 142         params[0].type = ACPI_TYPE_BUFFER;
 143         params[0].buffer.length = sizeof(nouveau_dsm_muid);
 144         params[0].buffer.pointer = (char *)nouveau_dsm_muid;
 145         params[1].type = ACPI_TYPE_INTEGER;
 146         params[1].integer.value = 0x00000102;
 147         params[2].type = ACPI_TYPE_INTEGER;
 148         params[2].integer.value = func;
 149         params[3].type = ACPI_TYPE_INTEGER;
 150         params[3].integer.value = arg;
 151
 152         err = acpi_evaluate_object(handle, "_DSM", &input, &output);
 153         if (err) {
 154                 printk(KERN_INFO "failed to evaluate _DSM: %d\n", err);
 155                 return err;
 156         }
 157
 158         obj = (union acpi_object *)output.pointer;
 159
 160         if (obj->type == ACPI_TYPE_INTEGER)
 161                 if (obj->integer.value == 0x80000002)
 162                         return -ENODEV;
 163
 164         if (obj->type == ACPI_TYPE_BUFFER) {
 165                 if (obj->buffer.length == 4 && result) {
 166                         *result = 0;
 167                         *result |= obj->buffer.pointer[0];
 168                         *result |= (obj->buffer.pointer[1] << 8);
 169                         *result |= (obj->buffer.pointer[2] << 16);
 170                         *result |= (obj->buffer.pointer[3] << 24);
 171                 }
 172         }
 173
 174         kfree(output.pointer);
 175         return 0;
 176 }
 177
 178 /* Returns 1 if a DSM function is usable and 0 otherwise */
 179 static int nouveau_test_dsm(acpi_handle test_handle,
 180         int (*dsm_func)(acpi_handle, int, int, uint32_t *),
 181         int sfnc)
 182 {
 183         u32 result = 0;
 184
 185         /* Function 0 returns a Buffer containing available functions. The args
 186          * parameter is ignored for function 0, so just put 0 in it */
 187         if (dsm_func(test_handle, 0, 0, &result))
 188                 return 0;
 189
 190         /* ACPI Spec v4 9.14.1: if bit 0 is zero, no function is supported. If
 191          * the n-th bit is enabled, function n is supported */
 192         return result & 1 && result & (1 << sfnc);
 193 }
 194
 195 static int nouveau_dsm_switch_mux(acpi_handle handle, int mux_id)
 196 {
 197         mxm_wmi_call_mxmx(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
 198         mxm_wmi_call_mxds(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
 199         return nouveau_dsm(handle, NOUVEAU_DSM_LED, mux_id, NULL);
 200 }
 201
 202 static int nouveau_dsm_set_discrete_state(acpi_handle handle, enum vga_switcheroo_state state)
 203 {
 204         int arg;
 205         if (state == VGA_SWITCHEROO_ON)
 206                 arg = NOUVEAU_DSM_POWER_SPEED;
 207         else
 208                 arg = NOUVEAU_DSM_POWER_STAMINA;
 209         nouveau_dsm(handle, NOUVEAU_DSM_POWER, arg, NULL);
 210         return 0;
 211 }
 212
 213 static int nouveau_dsm_switchto(enum vga_switcheroo_client_id id)
 214 {
 215         if (!nouveau_dsm_priv.dsm_detected)
 216                 return 0;
 217         if (id == VGA_SWITCHEROO_IGD)
 218                 return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_STAMINA);
 219         else
 220                 return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_SPEED);
 221 }
 222
 223 static int nouveau_dsm_power_state(enum vga_switcheroo_client_id id,
 224                                    enum vga_switcheroo_state state)
 225 {
 226         if (id == VGA_SWITCHEROO_IGD)
 227                 return 0;
 228
 229         /* Optimus laptops have the card already disabled in
 230          * nouveau_switcheroo_set_state */
 231         if (!nouveau_dsm_priv.dsm_detected)
 232                 return 0;
 233
 234         return nouveau_dsm_set_discrete_state(nouveau_dsm_priv.dhandle, state);
 235 }
 236
 237 static int nouveau_dsm_get_client_id(struct pci_dev *pdev)
 238 {
 239         /* easy option one - intel vendor ID means Integrated */
 240         if (pdev->vendor == PCI_VENDOR_ID_INTEL)
 241                 return VGA_SWITCHEROO_IGD;
 242
 243         /* is this device on Bus 0? - this may need improving */
 244         if (pdev->bus->number == 0)
 245                 return VGA_SWITCHEROO_IGD;
 246
 247         return VGA_SWITCHEROO_DIS;
 248 }
 249
 250 static struct vga_switcheroo_handler nouveau_dsm_handler = {
 251         .switchto = nouveau_dsm_switchto,
 252         .power_state = nouveau_dsm_power_state,
 253         .get_client_id = nouveau_dsm_get_client_id,
 254 };
 255
 256 static int nouveau_dsm_pci_probe(struct pci_dev *pdev)
 257 {
 258         acpi_handle dhandle;
 259         int retval = 0;
 260
 261         dhandle = DEVICE_ACPI_HANDLE(&pdev->dev);
 262         if (!dhandle)
 263                 return false;
 264
 265         if (!acpi_has_method(dhandle, "_DSM")) {
 266                 nouveau_dsm_priv.other_handle = dhandle;
 267                 return false;
 268         }
 269         if (nouveau_test_dsm(dhandle, nouveau_dsm, NOUVEAU_DSM_POWER))
 270                 retval |= NOUVEAU_DSM_HAS_MUX;
 271
 272         if (nouveau_test_dsm(dhandle, nouveau_optimus_dsm,
 273                 NOUVEAU_DSM_OPTIMUS_CAPS))
 274                 retval |= NOUVEAU_DSM_HAS_OPT;
 275
 276         if (retval & NOUVEAU_DSM_HAS_OPT) {
 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         if (retval)
 286                 nouveau_dsm_priv.dhandle = dhandle;
 287
 288         return retval;
 289 }
 290
 291 static bool nouveau_dsm_detect(void)
 292 {
 293         char acpi_method_name[255] = { 0 };
 294         struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
 295         struct pci_dev *pdev = NULL;
 296         int has_dsm = 0;
 297         int has_optimus = 0;
 298         int vga_count = 0;
 299         bool guid_valid;
 300         int retval;
 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                 retval = nouveau_dsm_pci_probe(pdev);
 314                 if (retval & NOUVEAU_DSM_HAS_MUX)
 315                         has_dsm |= 1;
 316                 if (retval & NOUVEAU_DSM_HAS_OPT)
 317                         has_optimus = 1;
 318         }
 319
 320         /* find the optimus DSM or the old v1 DSM */
 321         if (has_optimus == 1) {
 322                 acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
 323                         &buffer);
 324                 printk(KERN_INFO "VGA switcheroo: detected Optimus DSM method %s handle\n",
 325                         acpi_method_name);
 326                 nouveau_dsm_priv.optimus_detected = true;
 327                 ret = true;
 328         } else if (vga_count == 2 && has_dsm && guid_valid) {
 329                 acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
 330                         &buffer);
 331                 printk(KERN_INFO "VGA switcheroo: detected DSM switching method %s handle\n",
 332                         acpi_method_name);
 333                 nouveau_dsm_priv.dsm_detected = true;
 334                 /*
 335                  * On some systems hotplug events are generated for the device
 336                  * being switched off when _DSM is executed.  They cause ACPI
 337                  * hotplug to trigger and attempt to remove the device from
 338                  * the system, which causes it to break down.  Prevent that from
 339                  * happening by setting the no_hotplug flag for the involved
 340                  * ACPI device objects.
 341                  */
 342                 acpi_bus_no_hotplug(nouveau_dsm_priv.dhandle);
 343                 acpi_bus_no_hotplug(nouveau_dsm_priv.other_handle);
 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);
 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)
 367                 return;
 368
 369         nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_FLAGS,
 370                             0x3, &result);
 371
 372         nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_CAPS,
 373                 NOUVEAU_DSM_OPTIMUS_SET_POWERDOWN, &result);
 374
 375 }
 376
 377 void nouveau_unregister_dsm_handler(void)
 378 {
 379         if (nouveau_dsm_priv.optimus_detected || nouveau_dsm_priv.dsm_detected)
 380                 vga_switcheroo_unregister_handler();
 381 }
 382 #else
 383 void nouveau_register_dsm_handler(void) {}
 384 void nouveau_unregister_dsm_handler(void) {}
 385 void nouveau_switcheroo_optimus_dsm(void) {}
 386 #endif
 387
 388 /* retrieve the ROM in 4k blocks */
 389 static int nouveau_rom_call(acpi_handle rom_handle, uint8_t *bios,
 390                             int offset, int len)
 391 {
 392         acpi_status status;
 393         union acpi_object rom_arg_elements[2], *obj;
 394         struct acpi_object_list rom_arg;
 395         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL};
 396
 397         rom_arg.count = 2;
 398         rom_arg.pointer = &rom_arg_elements[0];
 399
 400         rom_arg_elements[0].type = ACPI_TYPE_INTEGER;
 401         rom_arg_elements[0].integer.value = offset;
 402
 403         rom_arg_elements[1].type = ACPI_TYPE_INTEGER;
 404         rom_arg_elements[1].integer.value = len;
 405
 406         status = acpi_evaluate_object(rom_handle, NULL, &rom_arg, &buffer);
 407         if (ACPI_FAILURE(status)) {
 408                 printk(KERN_INFO "failed to evaluate ROM got %s\n", acpi_format_exception(status));
 409                 return -ENODEV;
 410         }
 411         obj = (union acpi_object *)buffer.pointer;
 412         memcpy(bios+offset, obj->buffer.pointer, len);
 413         kfree(buffer.pointer);
 414         return len;
 415 }
 416
 417 bool nouveau_acpi_rom_supported(struct pci_dev *pdev)
 418 {
 419         acpi_status status;
 420         acpi_handle dhandle, rom_handle;
 421
 422         dhandle = DEVICE_ACPI_HANDLE(&pdev->dev);
 423         if (!dhandle)
 424                 return false;
 425
 426         status = acpi_get_handle(dhandle, "_ROM", &rom_handle);
 427         if (ACPI_FAILURE(status))
 428                 return false;
 429
 430         nouveau_dsm_priv.rom_handle = rom_handle;
 431         return true;
 432 }
 433
 434 int nouveau_acpi_get_bios_chunk(uint8_t *bios, int offset, int len)
 435 {
 436         return nouveau_rom_call(nouveau_dsm_priv.rom_handle, bios, offset, len);
 437 }
 438
 439 void *
 440 nouveau_acpi_edid(struct drm_device *dev, struct drm_connector *connector)
 441 {
 442         struct acpi_device *acpidev;
 443         acpi_handle handle;
 444         int type, ret;
 445         void *edid;
 446
 447         switch (connector->connector_type) {
 448         case DRM_MODE_CONNECTOR_LVDS:
 449         case DRM_MODE_CONNECTOR_eDP:
 450                 type = ACPI_VIDEO_DISPLAY_LCD;
 451                 break;
 452         default:
 453                 return NULL;
 454         }
 455
 456         handle = DEVICE_ACPI_HANDLE(&dev->pdev->dev);
 457         if (!handle)
 458                 return NULL;
 459
 460         ret = acpi_bus_get_device(handle, &acpidev);
 461         if (ret)
 462                 return NULL;
 463
 464         ret = acpi_video_get_edid(acpidev, type, -1, &edid);
 465         if (ret < 0)
 466                 return NULL;
 467
 468         return kmemdup(edid, EDID_LENGTH, GFP_KERNEL);
 469 }