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_drm.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         acpi_handle dhandle;
  49         acpi_handle rom_handle;
  50 } nouveau_dsm_priv;
  51
  52 bool nouveau_is_optimus(void) {
  53         return nouveau_dsm_priv.optimus_detected;
  54 }
  55
  56 bool nouveau_is_v1_dsm(void) {
  57         return nouveau_dsm_priv.dsm_detected;
  58 }
  59
  60 #define NOUVEAU_DSM_HAS_MUX 0x1
  61 #define NOUVEAU_DSM_HAS_OPT 0x2
  62
  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         struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
  76         struct acpi_object_list input;
  77         union acpi_object params[4];
  78         union acpi_object *obj;
  79         int i, err;
  80         char args_buff[4];
  81
  82         input.count = 4;
  83         input.pointer = params;
  84         params[0].type = ACPI_TYPE_BUFFER;
  85         params[0].buffer.length = sizeof(nouveau_op_dsm_muid);
  86         params[0].buffer.pointer = (char *)nouveau_op_dsm_muid;
  87         params[1].type = ACPI_TYPE_INTEGER;
  88         params[1].integer.value = 0x00000100;
  89         params[2].type = ACPI_TYPE_INTEGER;
  90         params[2].integer.value = func;
  91         params[3].type = ACPI_TYPE_BUFFER;
  92         params[3].buffer.length = 4;
  93         /* ACPI is little endian, AABBCCDD becomes {DD,CC,BB,AA} */
  94         for (i = 0; i < 4; i++)
  95                 args_buff[i] = (arg >> i * 8) & 0xFF;
  96         params[3].buffer.pointer = args_buff;
  97
  98         err = acpi_evaluate_object(handle, "_DSM", &input, &output);
  99         if (err) {
 100                 printk(KERN_INFO "failed to evaluate _DSM: %d\n", err);
 101                 return err;
 102         }
 103
 104         obj = (union acpi_object *)output.pointer;
 105
 106         if (obj->type == ACPI_TYPE_INTEGER)
 107                 if (obj->integer.value == 0x80000002) {
 108                         return -ENODEV;
 109                 }
 110
 111         if (obj->type == ACPI_TYPE_BUFFER) {
 112                 if (obj->buffer.length == 4 && result) {
 113                         *result = 0;
 114                         *result |= obj->buffer.pointer[0];
 115                         *result |= (obj->buffer.pointer[1] << 8);
 116                         *result |= (obj->buffer.pointer[2] << 16);
 117                         *result |= (obj->buffer.pointer[3] << 24);
 118                 }
 119         }
 120
 121         kfree(output.pointer);
 122         return 0;
 123 }
 124
 125 static int nouveau_dsm(acpi_handle handle, int func, int arg, uint32_t *result)
 126 {
 127         struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
 128         struct acpi_object_list input;
 129         union acpi_object params[4];
 130         union acpi_object *obj;
 131         int err;
 132
 133         input.count = 4;
 134         input.pointer = params;
 135         params[0].type = ACPI_TYPE_BUFFER;
 136         params[0].buffer.length = sizeof(nouveau_dsm_muid);
 137         params[0].buffer.pointer = (char *)nouveau_dsm_muid;
 138         params[1].type = ACPI_TYPE_INTEGER;
 139         params[1].integer.value = 0x00000102;
 140         params[2].type = ACPI_TYPE_INTEGER;
 141         params[2].integer.value = func;
 142         params[3].type = ACPI_TYPE_INTEGER;
 143         params[3].integer.value = arg;
 144
 145         err = acpi_evaluate_object(handle, "_DSM", &input, &output);
 146         if (err) {
 147                 printk(KERN_INFO "failed to evaluate _DSM: %d\n", err);
 148                 return err;
 149         }
 150
 151         obj = (union acpi_object *)output.pointer;
 152
 153         if (obj->type == ACPI_TYPE_INTEGER)
 154                 if (obj->integer.value == 0x80000002)
 155                         return -ENODEV;
 156
 157         if (obj->type == ACPI_TYPE_BUFFER) {
 158                 if (obj->buffer.length == 4 && result) {
 159                         *result = 0;
 160                         *result |= obj->buffer.pointer[0];
 161                         *result |= (obj->buffer.pointer[1] << 8);
 162                         *result |= (obj->buffer.pointer[2] << 16);
 163                         *result |= (obj->buffer.pointer[3] << 24);
 164                 }
 165         }
 166
 167         kfree(output.pointer);
 168         return 0;
 169 }
 170
 171 /* Returns 1 if a DSM function is usable and 0 otherwise */
 172 static int nouveau_test_dsm(acpi_handle test_handle,
 173         int (*dsm_func)(acpi_handle, int, int, uint32_t *),
 174         int sfnc)
 175 {
 176         u32 result = 0;
 177
 178         /* Function 0 returns a Buffer containing available functions. The args
 179          * parameter is ignored for function 0, so just put 0 in it */
 180         if (dsm_func(test_handle, 0, 0, &result))
 181                 return 0;
 182
 183         /* ACPI Spec v4 9.14.1: if bit 0 is zero, no function is supported. If
 184          * the n-th bit is enabled, function n is supported */
 185         return result & 1 && result & (1 << sfnc);
 186 }
 187
 188 static int nouveau_dsm_switch_mux(acpi_handle handle, int mux_id)
 189 {
 190         mxm_wmi_call_mxmx(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
 191         mxm_wmi_call_mxds(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
 192         return nouveau_dsm(handle, NOUVEAU_DSM_LED, mux_id, NULL);
 193 }
 194
 195 static int nouveau_dsm_set_discrete_state(acpi_handle handle, enum vga_switcheroo_state state)
 196 {
 197         int arg;
 198         if (state == VGA_SWITCHEROO_ON)
 199                 arg = NOUVEAU_DSM_POWER_SPEED;
 200         else
 201                 arg = NOUVEAU_DSM_POWER_STAMINA;
 202         nouveau_dsm(handle, NOUVEAU_DSM_POWER, arg, NULL);
 203         return 0;
 204 }
 205
 206 static int nouveau_dsm_switchto(enum vga_switcheroo_client_id id)
 207 {
 208         if (!nouveau_dsm_priv.dsm_detected)
 209                 return 0;
 210         if (id == VGA_SWITCHEROO_IGD)
 211                 return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_STAMINA);
 212         else
 213                 return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_SPEED);
 214 }
 215
 216 static int nouveau_dsm_power_state(enum vga_switcheroo_client_id id,
 217                                    enum vga_switcheroo_state state)
 218 {
 219         if (id == VGA_SWITCHEROO_IGD)
 220                 return 0;
 221
 222         /* Optimus laptops have the card already disabled in
 223          * nouveau_switcheroo_set_state */
 224         if (!nouveau_dsm_priv.dsm_detected)
 225                 return 0;
 226
 227         return nouveau_dsm_set_discrete_state(nouveau_dsm_priv.dhandle, state);
 228 }
 229
 230 static int nouveau_dsm_get_client_id(struct pci_dev *pdev)
 231 {
 232         /* easy option one - intel vendor ID means Integrated */
 233         if (pdev->vendor == PCI_VENDOR_ID_INTEL)
 234                 return VGA_SWITCHEROO_IGD;
 235
 236         /* is this device on Bus 0? - this may need improving */
 237         if (pdev->bus->number == 0)
 238                 return VGA_SWITCHEROO_IGD;
 239
 240         return VGA_SWITCHEROO_DIS;
 241 }
 242
 243 static struct vga_switcheroo_handler nouveau_dsm_handler = {
 244         .switchto = nouveau_dsm_switchto,
 245         .power_state = nouveau_dsm_power_state,
 246         .get_client_id = nouveau_dsm_get_client_id,
 247 };
 248
 249 static int nouveau_dsm_pci_probe(struct pci_dev *pdev)
 250 {
 251         acpi_handle dhandle;
 252         int retval = 0;
 253
 254         dhandle = ACPI_HANDLE(&pdev->dev);
 255         if (!dhandle)
 256                 return false;
 257
 258         if (!acpi_has_method(dhandle, "_DSM"))
 259                 return false;
 260
 261         if (nouveau_test_dsm(dhandle, nouveau_dsm, NOUVEAU_DSM_POWER))
 262                 retval |= NOUVEAU_DSM_HAS_MUX;
 263
 264         if (nouveau_test_dsm(dhandle, nouveau_optimus_dsm,
 265                 NOUVEAU_DSM_OPTIMUS_CAPS))
 266                 retval |= NOUVEAU_DSM_HAS_OPT;
 267
 268         if (retval & NOUVEAU_DSM_HAS_OPT) {
 269                 uint32_t result;
 270                 nouveau_optimus_dsm(dhandle, NOUVEAU_DSM_OPTIMUS_CAPS, 0,
 271                                     &result);
 272                 dev_info(&pdev->dev, "optimus capabilities: %s, status %s%s\n",
 273                          (result & OPTIMUS_ENABLED) ? "enabled" : "disabled",
 274                          (result & OPTIMUS_DYNAMIC_PWR_CAP) ? "dynamic power, " : "",
 275                          (result & OPTIMUS_HDA_CODEC_MASK) ? "hda bios codec supported" : "");
 276         }
 277         if (retval)
 278                 nouveau_dsm_priv.dhandle = dhandle;
 279
 280         return retval;
 281 }
 282
 283 static bool nouveau_dsm_detect(void)
 284 {
 285         char acpi_method_name[255] = { 0 };
 286         struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
 287         struct pci_dev *pdev = NULL;
 288         int has_dsm = 0;
 289         int has_optimus = 0;
 290         int vga_count = 0;
 291         bool guid_valid;
 292         int retval;
 293         bool ret = false;
 294
 295         /* lookup the MXM GUID */
 296         guid_valid = mxm_wmi_supported();
 297
 298         if (guid_valid)
 299                 printk("MXM: GUID detected in BIOS\n");
 300
 301         /* now do DSM detection */
 302         while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
 303                 vga_count++;
 304
 305                 retval = nouveau_dsm_pci_probe(pdev);
 306                 if (retval & NOUVEAU_DSM_HAS_MUX)
 307                         has_dsm |= 1;
 308                 if (retval & NOUVEAU_DSM_HAS_OPT)
 309                         has_optimus = 1;
 310         }
 311
 312         while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_3D << 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         /* find the optimus DSM or the old v1 DSM */
 323         if (has_optimus == 1) {
 324                 acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
 325                         &buffer);
 326                 printk(KERN_INFO "VGA switcheroo: detected Optimus DSM method %s handle\n",
 327                         acpi_method_name);
 328                 nouveau_dsm_priv.optimus_detected = true;
 329                 ret = true;
 330         } else if (vga_count == 2 && has_dsm && guid_valid) {
 331                 acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
 332                         &buffer);
 333                 printk(KERN_INFO "VGA switcheroo: detected DSM switching method %s handle\n",
 334                         acpi_method_name);
 335                 nouveau_dsm_priv.dsm_detected = true;
 336                 ret = true;
 337         }
 338
 339
 340         return ret;
 341 }
 342
 343 void nouveau_register_dsm_handler(void)
 344 {
 345         bool r;
 346
 347         r = nouveau_dsm_detect();
 348         if (!r)
 349                 return;
 350
 351         vga_switcheroo_register_handler(&nouveau_dsm_handler);
 352 }
 353
 354 /* Must be called for Optimus models before the card can be turned off */
 355 void nouveau_switcheroo_optimus_dsm(void)
 356 {
 357         u32 result = 0;
 358         if (!nouveau_dsm_priv.optimus_detected)
 359                 return;
 360
 361         nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_FLAGS,
 362                             0x3, &result);
 363
 364         nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_CAPS,
 365                 NOUVEAU_DSM_OPTIMUS_SET_POWERDOWN, &result);
 366
 367 }
 368
 369 void nouveau_unregister_dsm_handler(void)
 370 {
 371         if (nouveau_dsm_priv.optimus_detected || nouveau_dsm_priv.dsm_detected)
 372                 vga_switcheroo_unregister_handler();
 373 }
 374
 375 /* retrieve the ROM in 4k blocks */
 376 static int nouveau_rom_call(acpi_handle rom_handle, uint8_t *bios,
 377                             int offset, int len)
 378 {
 379         acpi_status status;
 380         union acpi_object rom_arg_elements[2], *obj;
 381         struct acpi_object_list rom_arg;
 382         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL};
 383
 384         rom_arg.count = 2;
 385         rom_arg.pointer = &rom_arg_elements[0];
 386
 387         rom_arg_elements[0].type = ACPI_TYPE_INTEGER;
 388         rom_arg_elements[0].integer.value = offset;
 389
 390         rom_arg_elements[1].type = ACPI_TYPE_INTEGER;
 391         rom_arg_elements[1].integer.value = len;
 392
 393         status = acpi_evaluate_object(rom_handle, NULL, &rom_arg, &buffer);
 394         if (ACPI_FAILURE(status)) {
 395                 printk(KERN_INFO "failed to evaluate ROM got %s\n", acpi_format_exception(status));
 396                 return -ENODEV;
 397         }
 398         obj = (union acpi_object *)buffer.pointer;
 399         memcpy(bios+offset, obj->buffer.pointer, len);
 400         kfree(buffer.pointer);
 401         return len;
 402 }
 403
 404 bool nouveau_acpi_rom_supported(struct pci_dev *pdev)
 405 {
 406         acpi_status status;
 407         acpi_handle dhandle, rom_handle;
 408
 409         if (!nouveau_dsm_priv.dsm_detected && !nouveau_dsm_priv.optimus_detected)
 410                 return false;
 411
 412         dhandle = ACPI_HANDLE(&pdev->dev);
 413         if (!dhandle)
 414                 return false;
 415
 416         status = acpi_get_handle(dhandle, "_ROM", &rom_handle);
 417         if (ACPI_FAILURE(status))
 418                 return false;
 419
 420         nouveau_dsm_priv.rom_handle = rom_handle;
 421         return true;
 422 }
 423
 424 int nouveau_acpi_get_bios_chunk(uint8_t *bios, int offset, int len)
 425 {
 426         return nouveau_rom_call(nouveau_dsm_priv.rom_handle, bios, offset, len);
 427 }
 428
 429 void *
 430 nouveau_acpi_edid(struct drm_device *dev, struct drm_connector *connector)
 431 {
 432         struct acpi_device *acpidev;
 433         acpi_handle handle;
 434         int type, ret;
 435         void *edid;
 436
 437         switch (connector->connector_type) {
 438         case DRM_MODE_CONNECTOR_LVDS:
 439         case DRM_MODE_CONNECTOR_eDP:
 440                 type = ACPI_VIDEO_DISPLAY_LCD;
 441                 break;
 442         default:
 443                 return NULL;
 444         }
 445
 446         handle = ACPI_HANDLE(&dev->pdev->dev);
 447         if (!handle)
 448                 return NULL;
 449
 450         ret = acpi_bus_get_device(handle, &acpidev);
 451         if (ret)
 452                 return NULL;
 453
 454         ret = acpi_video_get_edid(acpidev, type, -1, &edid);
 455         if (ret < 0)
 456                 return NULL;
 457
 458         return kmemdup(edid, EDID_LENGTH, GFP_KERNEL);
 459 }