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