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 rom_handle;
  55 } nouveau_dsm_priv;
  56
  57 bool nouveau_is_optimus(void) {
  58         return nouveau_dsm_priv.optimus_detected;
  59 }
  60
  61 bool nouveau_is_v1_dsm(void) {
  62         return nouveau_dsm_priv.dsm_detected;
  63 }
  64
  65 #define NOUVEAU_DSM_HAS_MUX 0x1
  66 #define NOUVEAU_DSM_HAS_OPT 0x2
  67
  68 static const char nouveau_dsm_muid[] = {
  69         0xA0, 0xA0, 0x95, 0x9D, 0x60, 0x00, 0x48, 0x4D,
  70         0xB3, 0x4D, 0x7E, 0x5F, 0xEA, 0x12, 0x9F, 0xD4,
  71 };
  72
  73 static const char nouveau_op_dsm_muid[] = {
  74         0xF8, 0xD8, 0x86, 0xA4, 0xDA, 0x0B, 0x1B, 0x47,
  75         0xA7, 0x2B, 0x60, 0x42, 0xA6, 0xB5, 0xBE, 0xE0,
  76 };
  77
  78 static int nouveau_optimus_dsm(acpi_handle handle, int func, int arg, uint32_t *result)
  79 {
  80         struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
  81         struct acpi_object_list input;
  82         union acpi_object params[4];
  83         union acpi_object *obj;
  84         int i, err;
  85         char args_buff[4];
  86
  87         input.count = 4;
  88         input.pointer = params;
  89         params[0].type = ACPI_TYPE_BUFFER;
  90         params[0].buffer.length = sizeof(nouveau_op_dsm_muid);
  91         params[0].buffer.pointer = (char *)nouveau_op_dsm_muid;
  92         params[1].type = ACPI_TYPE_INTEGER;
  93         params[1].integer.value = 0x00000100;
  94         params[2].type = ACPI_TYPE_INTEGER;
  95         params[2].integer.value = func;
  96         params[3].type = ACPI_TYPE_BUFFER;
  97         params[3].buffer.length = 4;
  98         /* ACPI is little endian, AABBCCDD becomes {DD,CC,BB,AA} */
  99         for (i = 0; i < 4; i++)
 100                 args_buff[i] = (arg >> i * 8) & 0xFF;
 101         params[3].buffer.pointer = args_buff;
 102
 103         err = acpi_evaluate_object(handle, "_DSM", &input, &output);
 104         if (err) {
 105                 printk(KERN_INFO "failed to evaluate _DSM: %d\n", err);
 106                 return err;
 107         }
 108
 109         obj = (union acpi_object *)output.pointer;
 110
 111         if (obj->type == ACPI_TYPE_INTEGER)
 112                 if (obj->integer.value == 0x80000002) {
 113                         return -ENODEV;
 114                 }
 115
 116         if (obj->type == ACPI_TYPE_BUFFER) {
 117                 if (obj->buffer.length == 4 && result) {
 118                         *result = 0;
 119                         *result |= obj->buffer.pointer[0];
 120                         *result |= (obj->buffer.pointer[1] << 8);
 121                         *result |= (obj->buffer.pointer[2] << 16);
 122                         *result |= (obj->buffer.pointer[3] << 24);
 123                 }
 124         }
 125
 126         kfree(output.pointer);
 127         return 0;
 128 }
 129
 130 static int nouveau_dsm(acpi_handle handle, int func, int arg, uint32_t *result)
 131 {
 132         struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
 133         struct acpi_object_list input;
 134         union acpi_object params[4];
 135         union acpi_object *obj;
 136         int err;
 137
 138         input.count = 4;
 139         input.pointer = params;
 140         params[0].type = ACPI_TYPE_BUFFER;
 141         params[0].buffer.length = sizeof(nouveau_dsm_muid);
 142         params[0].buffer.pointer = (char *)nouveau_dsm_muid;
 143         params[1].type = ACPI_TYPE_INTEGER;
 144         params[1].integer.value = 0x00000102;
 145         params[2].type = ACPI_TYPE_INTEGER;
 146         params[2].integer.value = func;
 147         params[3].type = ACPI_TYPE_INTEGER;
 148         params[3].integer.value = arg;
 149
 150         err = acpi_evaluate_object(handle, "_DSM", &input, &output);
 151         if (err) {
 152                 printk(KERN_INFO "failed to evaluate _DSM: %d\n", err);
 153                 return err;
 154         }
 155
 156         obj = (union acpi_object *)output.pointer;
 157
 158         if (obj->type == ACPI_TYPE_INTEGER)
 159                 if (obj->integer.value == 0x80000002)
 160                         return -ENODEV;
 161
 162         if (obj->type == ACPI_TYPE_BUFFER) {
 163                 if (obj->buffer.length == 4 && result) {
 164                         *result = 0;
 165                         *result |= obj->buffer.pointer[0];
 166                         *result |= (obj->buffer.pointer[1] << 8);
 167                         *result |= (obj->buffer.pointer[2] << 16);
 168                         *result |= (obj->buffer.pointer[3] << 24);
 169                 }
 170         }
 171
 172         kfree(output.pointer);
 173         return 0;
 174 }
 175
 176 /* Returns 1 if a DSM function is usable and 0 otherwise */
 177 static int nouveau_test_dsm(acpi_handle test_handle,
 178         int (*dsm_func)(acpi_handle, int, int, uint32_t *),
 179         int sfnc)
 180 {
 181         u32 result = 0;
 182
 183         /* Function 0 returns a Buffer containing available functions. The args
 184          * parameter is ignored for function 0, so just put 0 in it */
 185         if (dsm_func(test_handle, 0, 0, &result))
 186                 return 0;
 187
 188         /* ACPI Spec v4 9.14.1: if bit 0 is zero, no function is supported. If
 189          * the n-th bit is enabled, function n is supported */
 190         return result & 1 && result & (1 << sfnc);
 191 }
 192
 193 static int nouveau_dsm_switch_mux(acpi_handle handle, int mux_id)
 194 {
 195         mxm_wmi_call_mxmx(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
 196         mxm_wmi_call_mxds(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
 197         return nouveau_dsm(handle, NOUVEAU_DSM_LED, mux_id, NULL);
 198 }
 199
 200 static int nouveau_dsm_set_discrete_state(acpi_handle handle, enum vga_switcheroo_state state)
 201 {
 202         int arg;
 203         if (state == VGA_SWITCHEROO_ON)
 204                 arg = NOUVEAU_DSM_POWER_SPEED;
 205         else
 206                 arg = NOUVEAU_DSM_POWER_STAMINA;
 207         nouveau_dsm(handle, NOUVEAU_DSM_POWER, arg, NULL);
 208         return 0;
 209 }
 210
 211 static int nouveau_dsm_switchto(enum vga_switcheroo_client_id id)
 212 {
 213         if (!nouveau_dsm_priv.dsm_detected)
 214                 return 0;
 215         if (id == VGA_SWITCHEROO_IGD)
 216                 return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_STAMINA);
 217         else
 218                 return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_SPEED);
 219 }
 220
 221 static int nouveau_dsm_power_state(enum vga_switcheroo_client_id id,
 222                                    enum vga_switcheroo_state state)
 223 {
 224         if (id == VGA_SWITCHEROO_IGD)
 225                 return 0;
 226
 227         /* Optimus laptops have the card already disabled in
 228          * nouveau_switcheroo_set_state */
 229         if (!nouveau_dsm_priv.dsm_detected)
 230                 return 0;
 231
 232         return nouveau_dsm_set_discrete_state(nouveau_dsm_priv.dhandle, state);
 233 }
 234
 235 static int nouveau_dsm_get_client_id(struct pci_dev *pdev)
 236 {
 237         /* easy option one - intel vendor ID means Integrated */
 238         if (pdev->vendor == PCI_VENDOR_ID_INTEL)
 239                 return VGA_SWITCHEROO_IGD;
 240
 241         /* is this device on Bus 0? - this may need improving */
 242         if (pdev->bus->number == 0)
 243                 return VGA_SWITCHEROO_IGD;
 244
 245         return VGA_SWITCHEROO_DIS;
 246 }
 247
 248 static struct vga_switcheroo_handler nouveau_dsm_handler = {
 249         .switchto = nouveau_dsm_switchto,
 250         .power_state = nouveau_dsm_power_state,
 251         .get_client_id = nouveau_dsm_get_client_id,
 252 };
 253
 254 static int nouveau_dsm_pci_probe(struct pci_dev *pdev)
 255 {
 256         acpi_handle dhandle;
 257         int retval = 0;
 258
 259         dhandle = ACPI_HANDLE(&pdev->dev);
 260         if (!dhandle)
 261                 return false;
 262
 263         if (!acpi_has_method(dhandle, "_DSM"))
 264                 return false;
 265
 266         if (nouveau_test_dsm(dhandle, nouveau_dsm, NOUVEAU_DSM_POWER))
 267                 retval |= NOUVEAU_DSM_HAS_MUX;
 268
 269         if (nouveau_test_dsm(dhandle, nouveau_optimus_dsm,
 270                 NOUVEAU_DSM_OPTIMUS_CAPS))
 271                 retval |= NOUVEAU_DSM_HAS_OPT;
 272
 273         if (retval & NOUVEAU_DSM_HAS_OPT) {
 274                 uint32_t result;
 275                 nouveau_optimus_dsm(dhandle, NOUVEAU_DSM_OPTIMUS_CAPS, 0,
 276                                     &result);
 277                 dev_info(&pdev->dev, "optimus capabilities: %s, status %s%s\n",
 278                          (result & OPTIMUS_ENABLED) ? "enabled" : "disabled",
 279                          (result & OPTIMUS_DYNAMIC_PWR_CAP) ? "dynamic power, " : "",
 280                          (result & OPTIMUS_HDA_CODEC_MASK) ? "hda bios codec supported" : "");
 281         }
 282         if (retval)
 283                 nouveau_dsm_priv.dhandle = dhandle;
 284
 285         return retval;
 286 }
 287
 288 static bool nouveau_dsm_detect(void)
 289 {
 290         char acpi_method_name[255] = { 0 };
 291         struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
 292         struct pci_dev *pdev = NULL;
 293         int has_dsm = 0;
 294         int has_optimus = 0;
 295         int vga_count = 0;
 296         bool guid_valid;
 297         int retval;
 298         bool ret = false;
 299
 300         /* lookup the MXM GUID */
 301         guid_valid = mxm_wmi_supported();
 302
 303         if (guid_valid)
 304                 printk("MXM: GUID detected in BIOS\n");
 305
 306         /* now do DSM detection */
 307         while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
 308                 vga_count++;
 309
 310                 retval = nouveau_dsm_pci_probe(pdev);
 311                 if (retval & NOUVEAU_DSM_HAS_MUX)
 312                         has_dsm |= 1;
 313                 if (retval & NOUVEAU_DSM_HAS_OPT)
 314                         has_optimus = 1;
 315         }
 316
 317         /* find the optimus DSM or the old v1 DSM */
 318         if (has_optimus == 1) {
 319                 acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
 320                         &buffer);
 321                 printk(KERN_INFO "VGA switcheroo: detected Optimus DSM method %s handle\n",
 322                         acpi_method_name);
 323                 nouveau_dsm_priv.optimus_detected = true;
 324                 ret = true;
 325         } else if (vga_count == 2 && has_dsm && guid_valid) {
 326                 acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
 327                         &buffer);
 328                 printk(KERN_INFO "VGA switcheroo: detected DSM switching method %s handle\n",
 329                         acpi_method_name);
 330                 nouveau_dsm_priv.dsm_detected = true;
 331                 ret = true;
 332         }
 333
 334
 335         return ret;
 336 }
 337
 338 void nouveau_register_dsm_handler(void)
 339 {
 340         bool r;
 341
 342         r = nouveau_dsm_detect();
 343         if (!r)
 344                 return;
 345
 346         vga_switcheroo_register_handler(&nouveau_dsm_handler);
 347 }
 348
 349 /* Must be called for Optimus models before the card can be turned off */
 350 void nouveau_switcheroo_optimus_dsm(void)
 351 {
 352         u32 result = 0;
 353         if (!nouveau_dsm_priv.optimus_detected)
 354                 return;
 355
 356         nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_FLAGS,
 357                             0x3, &result);
 358
 359         nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_CAPS,
 360                 NOUVEAU_DSM_OPTIMUS_SET_POWERDOWN, &result);
 361
 362 }
 363
 364 void nouveau_unregister_dsm_handler(void)
 365 {
 366         if (nouveau_dsm_priv.optimus_detected || nouveau_dsm_priv.dsm_detected)
 367                 vga_switcheroo_unregister_handler();
 368 }
 369
 370 /* retrieve the ROM in 4k blocks */
 371 static int nouveau_rom_call(acpi_handle rom_handle, uint8_t *bios,
 372                             int offset, int len)
 373 {
 374         acpi_status status;
 375         union acpi_object rom_arg_elements[2], *obj;
 376         struct acpi_object_list rom_arg;
 377         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL};
 378
 379         rom_arg.count = 2;
 380         rom_arg.pointer = &rom_arg_elements[0];
 381
 382         rom_arg_elements[0].type = ACPI_TYPE_INTEGER;
 383         rom_arg_elements[0].integer.value = offset;
 384
 385         rom_arg_elements[1].type = ACPI_TYPE_INTEGER;
 386         rom_arg_elements[1].integer.value = len;
 387
 388         status = acpi_evaluate_object(rom_handle, NULL, &rom_arg, &buffer);
 389         if (ACPI_FAILURE(status)) {
 390                 printk(KERN_INFO "failed to evaluate ROM got %s\n", acpi_format_exception(status));
 391                 return -ENODEV;
 392         }
 393         obj = (union acpi_object *)buffer.pointer;
 394         memcpy(bios+offset, obj->buffer.pointer, len);
 395         kfree(buffer.pointer);
 396         return len;
 397 }
 398
 399 bool nouveau_acpi_rom_supported(struct pci_dev *pdev)
 400 {
 401         acpi_status status;
 402         acpi_handle dhandle, rom_handle;
 403
 404         if (!nouveau_dsm_priv.dsm_detected && !nouveau_dsm_priv.optimus_detected)
 405                 return false;
 406
 407         dhandle = ACPI_HANDLE(&pdev->dev);
 408         if (!dhandle)
 409                 return false;
 410
 411         status = acpi_get_handle(dhandle, "_ROM", &rom_handle);
 412         if (ACPI_FAILURE(status))
 413                 return false;
 414
 415         nouveau_dsm_priv.rom_handle = rom_handle;
 416         return true;
 417 }
 418
 419 int nouveau_acpi_get_bios_chunk(uint8_t *bios, int offset, int len)
 420 {
 421         return nouveau_rom_call(nouveau_dsm_priv.rom_handle, bios, offset, len);
 422 }
 423
 424 void *
 425 nouveau_acpi_edid(struct drm_device *dev, struct drm_connector *connector)
 426 {
 427         struct acpi_device *acpidev;
 428         acpi_handle handle;
 429         int type, ret;
 430         void *edid;
 431
 432         switch (connector->connector_type) {
 433         case DRM_MODE_CONNECTOR_LVDS:
 434         case DRM_MODE_CONNECTOR_eDP:
 435                 type = ACPI_VIDEO_DISPLAY_LCD;
 436                 break;
 437         default:
 438                 return NULL;
 439         }
 440
 441         handle = ACPI_HANDLE(&dev->pdev->dev);
 442         if (!handle)
 443                 return NULL;
 444
 445         ret = acpi_bus_get_device(handle, &acpidev);
 446         if (ret)
 447                 return NULL;
 448
 449         ret = acpi_video_get_edid(acpidev, type, -1, &edid);
 450         if (ret < 0)
 451                 return NULL;
 452
 453         return kmemdup(edid, EDID_LENGTH, GFP_KERNEL);
 454 }