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 static const char nouveau_dsm_muid[] = {
  70         0xA0, 0xA0, 0x95, 0x9D, 0x60, 0x00, 0x48, 0x4D,
  71         0xB3, 0x4D, 0x7E, 0x5F, 0xEA, 0x12, 0x9F, 0xD4,
  72 };
  73
  74 static const char nouveau_op_dsm_muid[] = {
  75         0xF8, 0xD8, 0x86, 0xA4, 0xDA, 0x0B, 0x1B, 0x47,
  76         0xA7, 0x2B, 0x60, 0x42, 0xA6, 0xB5, 0xBE, 0xE0,
  77 };
  78
  79 static int nouveau_optimus_dsm(acpi_handle handle, int func, int arg, uint32_t *result)
  80 {
  81         struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
  82         struct acpi_object_list input;
  83         union acpi_object params[4];
  84         union acpi_object *obj;
  85         int i, err;
  86         char args_buff[4];
  87
  88         input.count = 4;
  89         input.pointer = params;
  90         params[0].type = ACPI_TYPE_BUFFER;
  91         params[0].buffer.length = sizeof(nouveau_op_dsm_muid);
  92         params[0].buffer.pointer = (char *)nouveau_op_dsm_muid;
  93         params[1].type = ACPI_TYPE_INTEGER;
  94         params[1].integer.value = 0x00000100;
  95         params[2].type = ACPI_TYPE_INTEGER;
  96         params[2].integer.value = func;
  97         params[3].type = ACPI_TYPE_BUFFER;
  98         params[3].buffer.length = 4;
  99         /* ACPI is little endian, AABBCCDD becomes {DD,CC,BB,AA} */
 100         for (i = 0; i < 4; i++)
 101                 args_buff[i] = (arg >> i * 8) & 0xFF;
 102         params[3].buffer.pointer = args_buff;
 103
 104         err = acpi_evaluate_object(handle, "_DSM", &input, &output);
 105         if (err) {
 106                 printk(KERN_INFO "failed to evaluate _DSM: %d\n", err);
 107                 return err;
 108         }
 109
 110         obj = (union acpi_object *)output.pointer;
 111
 112         if (obj->type == ACPI_TYPE_INTEGER)
 113                 if (obj->integer.value == 0x80000002) {
 114                         kfree(output.pointer);
 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                         kfree(output.pointer);
 163                         return -ENODEV;
 164                 }
 165
 166         if (obj->type == ACPI_TYPE_BUFFER) {
 167                 if (obj->buffer.length == 4 && result) {
 168                         *result = 0;
 169                         *result |= obj->buffer.pointer[0];
 170                         *result |= (obj->buffer.pointer[1] << 8);
 171                         *result |= (obj->buffer.pointer[2] << 16);
 172                         *result |= (obj->buffer.pointer[3] << 24);
 173                 }
 174         }
 175
 176         kfree(output.pointer);
 177         return 0;
 178 }
 179
 180 /* Returns 1 if a DSM function is usable and 0 otherwise */
 181 static int nouveau_test_dsm(acpi_handle test_handle,
 182         int (*dsm_func)(acpi_handle, int, int, uint32_t *),
 183         int sfnc)
 184 {
 185         u32 result = 0;
 186
 187         /* Function 0 returns a Buffer containing available functions. The args
 188          * parameter is ignored for function 0, so just put 0 in it */
 189         if (dsm_func(test_handle, 0, 0, &result))
 190                 return 0;
 191
 192         /* ACPI Spec v4 9.14.1: if bit 0 is zero, no function is supported. If
 193          * the n-th bit is enabled, function n is supported */
 194         return result & 1 && result & (1 << sfnc);
 195 }
 196
 197 static int nouveau_dsm_switch_mux(acpi_handle handle, int mux_id)
 198 {
 199         mxm_wmi_call_mxmx(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
 200         mxm_wmi_call_mxds(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
 201         return nouveau_dsm(handle, NOUVEAU_DSM_LED, mux_id, NULL);
 202 }
 203
 204 static int nouveau_dsm_set_discrete_state(acpi_handle handle, enum vga_switcheroo_state state)
 205 {
 206         int arg;
 207         if (state == VGA_SWITCHEROO_ON)
 208                 arg = NOUVEAU_DSM_POWER_SPEED;
 209         else
 210                 arg = NOUVEAU_DSM_POWER_STAMINA;
 211         nouveau_dsm(handle, NOUVEAU_DSM_POWER, arg, NULL);
 212         return 0;
 213 }
 214
 215 static int nouveau_dsm_switchto(enum vga_switcheroo_client_id id)
 216 {
 217         if (!nouveau_dsm_priv.dsm_detected)
 218                 return 0;
 219         if (id == VGA_SWITCHEROO_IGD)
 220                 return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_STAMINA);
 221         else
 222                 return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_SPEED);
 223 }
 224
 225 static int nouveau_dsm_power_state(enum vga_switcheroo_client_id id,
 226                                    enum vga_switcheroo_state state)
 227 {
 228         if (id == VGA_SWITCHEROO_IGD)
 229                 return 0;
 230
 231         /* Optimus laptops have the card already disabled in
 232          * nouveau_switcheroo_set_state */
 233         if (!nouveau_dsm_priv.dsm_detected)
 234                 return 0;
 235
 236         return nouveau_dsm_set_discrete_state(nouveau_dsm_priv.dhandle, state);
 237 }
 238
 239 static int nouveau_dsm_get_client_id(struct pci_dev *pdev)
 240 {
 241         /* easy option one - intel vendor ID means Integrated */
 242         if (pdev->vendor == PCI_VENDOR_ID_INTEL)
 243                 return VGA_SWITCHEROO_IGD;
 244
 245         /* is this device on Bus 0? - this may need improving */
 246         if (pdev->bus->number == 0)
 247                 return VGA_SWITCHEROO_IGD;
 248
 249         return VGA_SWITCHEROO_DIS;
 250 }
 251
 252 static struct vga_switcheroo_handler nouveau_dsm_handler = {
 253         .switchto = nouveau_dsm_switchto,
 254         .power_state = nouveau_dsm_power_state,
 255         .get_client_id = nouveau_dsm_get_client_id,
 256 };
 257
 258 static int nouveau_dsm_pci_probe(struct pci_dev *pdev)
 259 {
 260         acpi_handle dhandle;
 261         int retval = 0;
 262
 263         dhandle = ACPI_HANDLE(&pdev->dev);
 264         if (!dhandle)
 265                 return false;
 266
 267         if (!acpi_has_method(dhandle, "_DSM")) {
 268                 nouveau_dsm_priv.other_handle = dhandle;
 269                 return false;
 270         }
 271         if (nouveau_test_dsm(dhandle, nouveau_dsm, NOUVEAU_DSM_POWER))
 272                 retval |= NOUVEAU_DSM_HAS_MUX;
 273
 274         if (nouveau_test_dsm(dhandle, nouveau_optimus_dsm,
 275                 NOUVEAU_DSM_OPTIMUS_CAPS))
 276                 retval |= NOUVEAU_DSM_HAS_OPT;
 277
 278         if (retval & NOUVEAU_DSM_HAS_OPT) {
 279                 uint32_t result;
 280                 nouveau_optimus_dsm(dhandle, NOUVEAU_DSM_OPTIMUS_CAPS, 0,
 281                                     &result);
 282                 dev_info(&pdev->dev, "optimus capabilities: %s, status %s%s\n",
 283                          (result & OPTIMUS_ENABLED) ? "enabled" : "disabled",
 284                          (result & OPTIMUS_DYNAMIC_PWR_CAP) ? "dynamic power, " : "",
 285                          (result & OPTIMUS_HDA_CODEC_MASK) ? "hda bios codec supported" : "");
 286         }
 287         if (retval)
 288                 nouveau_dsm_priv.dhandle = dhandle;
 289
 290         return retval;
 291 }
 292
 293 static bool nouveau_dsm_detect(void)
 294 {
 295         char acpi_method_name[255] = { 0 };
 296         struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
 297         struct pci_dev *pdev = NULL;
 298         int has_dsm = 0;
 299         int has_optimus = 0;
 300         int vga_count = 0;
 301         bool guid_valid;
 302         int retval;
 303         bool ret = false;
 304
 305         /* lookup the MXM GUID */
 306         guid_valid = mxm_wmi_supported();
 307
 308         if (guid_valid)
 309                 printk("MXM: GUID detected in BIOS\n");
 310
 311         /* now do DSM detection */
 312         while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
 313                 vga_count++;
 314
 315                 retval = nouveau_dsm_pci_probe(pdev);
 316                 if (retval & NOUVEAU_DSM_HAS_MUX)
 317                         has_dsm |= 1;
 318                 if (retval & NOUVEAU_DSM_HAS_OPT)
 319                         has_optimus = 1;
 320         }
 321
 322         while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_3D << 8, pdev)) != NULL) {
 323                 vga_count++;
 324
 325                 retval = nouveau_dsm_pci_probe(pdev);
 326                 if (retval & NOUVEAU_DSM_HAS_MUX)
 327                         has_dsm |= 1;
 328                 if (retval & NOUVEAU_DSM_HAS_OPT)
 329                         has_optimus = 1;
 330         }
 331
 332         /* find the optimus DSM or the old v1 DSM */
 333         if (has_optimus == 1) {
 334                 acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
 335                         &buffer);
 336                 printk(KERN_INFO "VGA switcheroo: detected Optimus DSM method %s handle\n",
 337                         acpi_method_name);
 338                 nouveau_dsm_priv.optimus_detected = true;
 339                 ret = true;
 340         } else if (vga_count == 2 && has_dsm && guid_valid) {
 341                 acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
 342                         &buffer);
 343                 printk(KERN_INFO "VGA switcheroo: detected DSM switching method %s handle\n",
 344                         acpi_method_name);
 345                 nouveau_dsm_priv.dsm_detected = true;
 346                 /*
 347                  * On some systems hotplug events are generated for the device
 348                  * being switched off when _DSM is executed.  They cause ACPI
 349                  * hotplug to trigger and attempt to remove the device from
 350                  * the system, which causes it to break down.  Prevent that from
 351                  * happening by setting the no_hotplug flag for the involved
 352                  * ACPI device objects.
 353                  */
 354                 acpi_bus_no_hotplug(nouveau_dsm_priv.dhandle);
 355                 acpi_bus_no_hotplug(nouveau_dsm_priv.other_handle);
 356                 ret = true;
 357         }
 358
 359
 360         return ret;
 361 }
 362
 363 void nouveau_register_dsm_handler(void)
 364 {
 365         bool r;
 366
 367         r = nouveau_dsm_detect();
 368         if (!r)
 369                 return;
 370
 371         vga_switcheroo_register_handler(&nouveau_dsm_handler);
 372 }
 373
 374 /* Must be called for Optimus models before the card can be turned off */
 375 void nouveau_switcheroo_optimus_dsm(void)
 376 {
 377         u32 result = 0;
 378         if (!nouveau_dsm_priv.optimus_detected)
 379                 return;
 380
 381         nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_FLAGS,
 382                             0x3, &result);
 383
 384         nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_CAPS,
 385                 NOUVEAU_DSM_OPTIMUS_SET_POWERDOWN, &result);
 386
 387 }
 388
 389 void nouveau_unregister_dsm_handler(void)
 390 {
 391         if (nouveau_dsm_priv.optimus_detected || nouveau_dsm_priv.dsm_detected)
 392                 vga_switcheroo_unregister_handler();
 393 }
 394
 395 /* retrieve the ROM in 4k blocks */
 396 static int nouveau_rom_call(acpi_handle rom_handle, uint8_t *bios,
 397                             int offset, int len)
 398 {
 399         acpi_status status;
 400         union acpi_object rom_arg_elements[2], *obj;
 401         struct acpi_object_list rom_arg;
 402         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL};
 403
 404         rom_arg.count = 2;
 405         rom_arg.pointer = &rom_arg_elements[0];
 406
 407         rom_arg_elements[0].type = ACPI_TYPE_INTEGER;
 408         rom_arg_elements[0].integer.value = offset;
 409
 410         rom_arg_elements[1].type = ACPI_TYPE_INTEGER;
 411         rom_arg_elements[1].integer.value = len;
 412
 413         status = acpi_evaluate_object(rom_handle, NULL, &rom_arg, &buffer);
 414         if (ACPI_FAILURE(status)) {
 415                 printk(KERN_INFO "failed to evaluate ROM got %s\n", acpi_format_exception(status));
 416                 return -ENODEV;
 417         }
 418         obj = (union acpi_object *)buffer.pointer;
 419         memcpy(bios+offset, obj->buffer.pointer, len);
 420         kfree(buffer.pointer);
 421         return len;
 422 }
 423
 424 bool nouveau_acpi_rom_supported(struct pci_dev *pdev)
 425 {
 426         acpi_status status;
 427         acpi_handle dhandle, rom_handle;
 428
 429         if (!nouveau_dsm_priv.dsm_detected && !nouveau_dsm_priv.optimus_detected)
 430                 return false;
 431
 432         dhandle = ACPI_HANDLE(&pdev->dev);
 433         if (!dhandle)
 434                 return false;
 435
 436         status = acpi_get_handle(dhandle, "_ROM", &rom_handle);
 437         if (ACPI_FAILURE(status))
 438                 return false;
 439
 440         nouveau_dsm_priv.rom_handle = rom_handle;
 441         return true;
 442 }
 443
 444 int nouveau_acpi_get_bios_chunk(uint8_t *bios, int offset, int len)
 445 {
 446         return nouveau_rom_call(nouveau_dsm_priv.rom_handle, bios, offset, len);
 447 }
 448
 449 void *
 450 nouveau_acpi_edid(struct drm_device *dev, struct drm_connector *connector)
 451 {
 452         struct acpi_device *acpidev;
 453         acpi_handle handle;
 454         int type, ret;
 455         void *edid;
 456
 457         switch (connector->connector_type) {
 458         case DRM_MODE_CONNECTOR_LVDS:
 459         case DRM_MODE_CONNECTOR_eDP:
 460                 type = ACPI_VIDEO_DISPLAY_LCD;
 461                 break;
 462         default:
 463                 return NULL;
 464         }
 465
 466         handle = ACPI_HANDLE(&dev->pdev->dev);
 467         if (!handle)
 468                 return NULL;
 469
 470         ret = acpi_bus_get_device(handle, &acpidev);
 471         if (ret)
 472                 return NULL;
 473
 474         ret = acpi_video_get_edid(acpidev, type, -1, &edid);
 475         if (ret < 0)
 476                 return NULL;
 477
 478         return kmemdup(edid, EDID_LENGTH, GFP_KERNEL);
 479 }