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 other_handle;
  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 #define NOUVEAU_DSM_HAS_MUX 0x1
  62 #define NOUVEAU_DSM_HAS_OPT 0x2
  63
  64 #ifdef CONFIG_VGA_SWITCHEROO
  65 static const char nouveau_dsm_muid[] = {
  66         0xA0, 0xA0, 0x95, 0x9D, 0x60, 0x00, 0x48, 0x4D,
  67         0xB3, 0x4D, 0x7E, 0x5F, 0xEA, 0x12, 0x9F, 0xD4,
  68 };
  69
  70 static const char nouveau_op_dsm_muid[] = {
  71         0xF8, 0xD8, 0x86, 0xA4, 0xDA, 0x0B, 0x1B, 0x47,
  72         0xA7, 0x2B, 0x60, 0x42, 0xA6, 0xB5, 0xBE, 0xE0,
  73 };
  74
  75 static int nouveau_optimus_dsm(acpi_handle handle, int func, int arg, uint32_t *result)
  76 {
  77         int i;
  78         union acpi_object *obj;
  79         char args_buff[4];
  80         union acpi_object argv4 = {
  81                 .buffer.type = ACPI_TYPE_BUFFER,
  82                 .buffer.length = 4,
  83                 .buffer.pointer = args_buff
  84         };
  85
  86         /* ACPI is little endian, AABBCCDD becomes {DD,CC,BB,AA} */
  87         for (i = 0; i < 4; i++)
  88                 args_buff[i] = (arg >> i * 8) & 0xFF;
  89
  90         *result = 0;
  91         obj = acpi_evaluate_dsm_typed(handle, nouveau_op_dsm_muid, 0x00000100,
  92                                       func, &argv4, ACPI_TYPE_BUFFER);
  93         if (!obj) {
  94                 acpi_handle_info(handle, "failed to evaluate _DSM\n");
  95                 return AE_ERROR;
  96         } else {
  97                 if (obj->buffer.length == 4) {
  98                         *result |= obj->buffer.pointer[0];
  99                         *result |= (obj->buffer.pointer[1] << 8);
 100                         *result |= (obj->buffer.pointer[2] << 16);
 101                         *result |= (obj->buffer.pointer[3] << 24);
 102                 }
 103                 ACPI_FREE(obj);
 104         }
 105
 106         return 0;
 107 }
 108
 109 /*
 110  * On some platforms, _DSM(nouveau_op_dsm_muid, func0) has special
 111  * requirements on the fourth parameter, so a private implementation
 112  * instead of using acpi_check_dsm().
 113  */
 114 static int nouveau_check_optimus_dsm(acpi_handle handle)
 115 {
 116         int result;
 117
 118         /*
 119          * Function 0 returns a Buffer containing available functions.
 120          * The args parameter is ignored for function 0, so just put 0 in it
 121          */
 122         if (nouveau_optimus_dsm(handle, 0, 0, &result))
 123                 return 0;
 124
 125         /*
 126          * ACPI Spec v4 9.14.1: if bit 0 is zero, no function is supported.
 127          * If the n-th bit is enabled, function n is supported
 128          */
 129         return result & 1 && result & (1 << NOUVEAU_DSM_OPTIMUS_CAPS);
 130 }
 131
 132 static int nouveau_dsm(acpi_handle handle, int func, int arg)
 133 {
 134         int ret = 0;
 135         union acpi_object *obj;
 136         union acpi_object argv4 = {
 137                 .integer.type = ACPI_TYPE_INTEGER,
 138                 .integer.value = arg,
 139         };
 140
 141         obj = acpi_evaluate_dsm_typed(handle, nouveau_dsm_muid, 0x00000102,
 142                                       func, &argv4, ACPI_TYPE_INTEGER);
 143         if (!obj) {
 144                 acpi_handle_info(handle, "failed to evaluate _DSM\n");
 145                 return AE_ERROR;
 146         } else {
 147                 if (obj->integer.value == 0x80000002)
 148                         ret = -ENODEV;
 149                 ACPI_FREE(obj);
 150         }
 151
 152         return ret;
 153 }
 154
 155 static int nouveau_dsm_switch_mux(acpi_handle handle, int mux_id)
 156 {
 157         mxm_wmi_call_mxmx(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
 158         mxm_wmi_call_mxds(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
 159         return nouveau_dsm(handle, NOUVEAU_DSM_LED, mux_id);
 160 }
 161
 162 static int nouveau_dsm_set_discrete_state(acpi_handle handle, enum vga_switcheroo_state state)
 163 {
 164         int arg;
 165         if (state == VGA_SWITCHEROO_ON)
 166                 arg = NOUVEAU_DSM_POWER_SPEED;
 167         else
 168                 arg = NOUVEAU_DSM_POWER_STAMINA;
 169         nouveau_dsm(handle, NOUVEAU_DSM_POWER, arg);
 170         return 0;
 171 }
 172
 173 static int nouveau_dsm_switchto(enum vga_switcheroo_client_id id)
 174 {
 175         if (!nouveau_dsm_priv.dsm_detected)
 176                 return 0;
 177         if (id == VGA_SWITCHEROO_IGD)
 178                 return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_STAMINA);
 179         else
 180                 return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_SPEED);
 181 }
 182
 183 static int nouveau_dsm_power_state(enum vga_switcheroo_client_id id,
 184                                    enum vga_switcheroo_state state)
 185 {
 186         if (id == VGA_SWITCHEROO_IGD)
 187                 return 0;
 188
 189         /* Optimus laptops have the card already disabled in
 190          * nouveau_switcheroo_set_state */
 191         if (!nouveau_dsm_priv.dsm_detected)
 192                 return 0;
 193
 194         return nouveau_dsm_set_discrete_state(nouveau_dsm_priv.dhandle, state);
 195 }
 196
 197 static int nouveau_dsm_get_client_id(struct pci_dev *pdev)
 198 {
 199         /* easy option one - intel vendor ID means Integrated */
 200         if (pdev->vendor == PCI_VENDOR_ID_INTEL)
 201                 return VGA_SWITCHEROO_IGD;
 202
 203         /* is this device on Bus 0? - this may need improving */
 204         if (pdev->bus->number == 0)
 205                 return VGA_SWITCHEROO_IGD;
 206
 207         return VGA_SWITCHEROO_DIS;
 208 }
 209
 210 static struct vga_switcheroo_handler nouveau_dsm_handler = {
 211         .switchto = nouveau_dsm_switchto,
 212         .power_state = nouveau_dsm_power_state,
 213         .get_client_id = nouveau_dsm_get_client_id,
 214 };
 215
 216 static int nouveau_dsm_pci_probe(struct pci_dev *pdev)
 217 {
 218         acpi_handle dhandle;
 219         int retval = 0;
 220
 221         dhandle = ACPI_HANDLE(&pdev->dev);
 222         if (!dhandle)
 223                 return false;
 224
 225         if (!acpi_has_method(dhandle, "_DSM")) {
 226                 nouveau_dsm_priv.other_handle = dhandle;
 227                 return false;
 228         }
 229         if (acpi_check_dsm(dhandle, nouveau_dsm_muid, 0x00000102,
 230                            1 << NOUVEAU_DSM_POWER))
 231                 retval |= NOUVEAU_DSM_HAS_MUX;
 232
 233         if (nouveau_check_optimus_dsm(dhandle))
 234                 retval |= NOUVEAU_DSM_HAS_OPT;
 235
 236         if (retval & NOUVEAU_DSM_HAS_OPT) {
 237                 uint32_t result;
 238                 nouveau_optimus_dsm(dhandle, NOUVEAU_DSM_OPTIMUS_CAPS, 0,
 239                                     &result);
 240                 dev_info(&pdev->dev, "optimus capabilities: %s, status %s%s\n",
 241                          (result & OPTIMUS_ENABLED) ? "enabled" : "disabled",
 242                          (result & OPTIMUS_DYNAMIC_PWR_CAP) ? "dynamic power, " : "",
 243                          (result & OPTIMUS_HDA_CODEC_MASK) ? "hda bios codec supported" : "");
 244         }
 245         if (retval)
 246                 nouveau_dsm_priv.dhandle = dhandle;
 247
 248         return retval;
 249 }
 250
 251 static bool nouveau_dsm_detect(void)
 252 {
 253         char acpi_method_name[255] = { 0 };
 254         struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
 255         struct pci_dev *pdev = NULL;
 256         int has_dsm = 0;
 257         int has_optimus = 0;
 258         int vga_count = 0;
 259         bool guid_valid;
 260         int retval;
 261         bool ret = false;
 262
 263         /* lookup the MXM GUID */
 264         guid_valid = mxm_wmi_supported();
 265
 266         if (guid_valid)
 267                 printk("MXM: GUID detected in BIOS\n");
 268
 269         /* now do DSM detection */
 270         while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
 271                 vga_count++;
 272
 273                 retval = nouveau_dsm_pci_probe(pdev);
 274                 if (retval & NOUVEAU_DSM_HAS_MUX)
 275                         has_dsm |= 1;
 276                 if (retval & NOUVEAU_DSM_HAS_OPT)
 277                         has_optimus = 1;
 278         }
 279
 280         while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_3D << 8, pdev)) != NULL) {
 281                 vga_count++;
 282
 283                 retval = nouveau_dsm_pci_probe(pdev);
 284                 if (retval & NOUVEAU_DSM_HAS_MUX)
 285                         has_dsm |= 1;
 286                 if (retval & NOUVEAU_DSM_HAS_OPT)
 287                         has_optimus = 1;
 288         }
 289
 290         /* find the optimus DSM or the old v1 DSM */
 291         if (has_optimus == 1) {
 292                 acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
 293                         &buffer);
 294                 printk(KERN_INFO "VGA switcheroo: detected Optimus DSM method %s handle\n",
 295                         acpi_method_name);
 296                 nouveau_dsm_priv.optimus_detected = true;
 297                 ret = true;
 298         } else if (vga_count == 2 && has_dsm && guid_valid) {
 299                 acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
 300                         &buffer);
 301                 printk(KERN_INFO "VGA switcheroo: detected DSM switching method %s handle\n",
 302                         acpi_method_name);
 303                 nouveau_dsm_priv.dsm_detected = true;
 304                 /*
 305                  * On some systems hotplug events are generated for the device
 306                  * being switched off when _DSM is executed.  They cause ACPI
 307                  * hotplug to trigger and attempt to remove the device from
 308                  * the system, which causes it to break down.  Prevent that from
 309                  * happening by setting the no_hotplug flag for the involved
 310                  * ACPI device objects.
 311                  */
 312                 acpi_bus_no_hotplug(nouveau_dsm_priv.dhandle);
 313                 acpi_bus_no_hotplug(nouveau_dsm_priv.other_handle);
 314                 ret = true;
 315         }
 316
 317
 318         return ret;
 319 }
 320
 321 void nouveau_register_dsm_handler(void)
 322 {
 323         bool r;
 324
 325         r = nouveau_dsm_detect();
 326         if (!r)
 327                 return;
 328
 329         vga_switcheroo_register_handler(&nouveau_dsm_handler);
 330 }
 331
 332 /* Must be called for Optimus models before the card can be turned off */
 333 void nouveau_switcheroo_optimus_dsm(void)
 334 {
 335         u32 result = 0;
 336         if (!nouveau_dsm_priv.optimus_detected)
 337                 return;
 338
 339         nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_FLAGS,
 340                             0x3, &result);
 341
 342         nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_CAPS,
 343                 NOUVEAU_DSM_OPTIMUS_SET_POWERDOWN, &result);
 344
 345 }
 346
 347 void nouveau_unregister_dsm_handler(void)
 348 {
 349         if (nouveau_dsm_priv.optimus_detected || nouveau_dsm_priv.dsm_detected)
 350                 vga_switcheroo_unregister_handler();
 351 }
 352 #else
 353 void nouveau_register_dsm_handler(void) {}
 354 void nouveau_unregister_dsm_handler(void) {}
 355 void nouveau_switcheroo_optimus_dsm(void) {}
 356 #endif
 357
 358 /* retrieve the ROM in 4k blocks */
 359 static int nouveau_rom_call(acpi_handle rom_handle, uint8_t *bios,
 360                             int offset, int len)
 361 {
 362         acpi_status status;
 363         union acpi_object rom_arg_elements[2], *obj;
 364         struct acpi_object_list rom_arg;
 365         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL};
 366
 367         rom_arg.count = 2;
 368         rom_arg.pointer = &rom_arg_elements[0];
 369
 370         rom_arg_elements[0].type = ACPI_TYPE_INTEGER;
 371         rom_arg_elements[0].integer.value = offset;
 372
 373         rom_arg_elements[1].type = ACPI_TYPE_INTEGER;
 374         rom_arg_elements[1].integer.value = len;
 375
 376         status = acpi_evaluate_object(rom_handle, NULL, &rom_arg, &buffer);
 377         if (ACPI_FAILURE(status)) {
 378                 printk(KERN_INFO "failed to evaluate ROM got %s\n", acpi_format_exception(status));
 379                 return -ENODEV;
 380         }
 381         obj = (union acpi_object *)buffer.pointer;
 382         memcpy(bios+offset, obj->buffer.pointer, len);
 383         kfree(buffer.pointer);
 384         return len;
 385 }
 386
 387 bool nouveau_acpi_rom_supported(struct pci_dev *pdev)
 388 {
 389         acpi_status status;
 390         acpi_handle dhandle, rom_handle;
 391
 392         dhandle = ACPI_HANDLE(&pdev->dev);
 393         if (!dhandle)
 394                 return false;
 395
 396         status = acpi_get_handle(dhandle, "_ROM", &rom_handle);
 397         if (ACPI_FAILURE(status))
 398                 return false;
 399
 400         nouveau_dsm_priv.rom_handle = rom_handle;
 401         return true;
 402 }
 403
 404 int nouveau_acpi_get_bios_chunk(uint8_t *bios, int offset, int len)
 405 {
 406         return nouveau_rom_call(nouveau_dsm_priv.rom_handle, bios, offset, len);
 407 }
 408
 409 void *
 410 nouveau_acpi_edid(struct drm_device *dev, struct drm_connector *connector)
 411 {
 412         struct acpi_device *acpidev;
 413         acpi_handle handle;
 414         int type, ret;
 415         void *edid;
 416
 417         switch (connector->connector_type) {
 418         case DRM_MODE_CONNECTOR_LVDS:
 419         case DRM_MODE_CONNECTOR_eDP:
 420                 type = ACPI_VIDEO_DISPLAY_LCD;
 421                 break;
 422         default:
 423                 return NULL;
 424         }
 425
 426         handle = ACPI_HANDLE(&dev->pdev->dev);
 427         if (!handle)
 428                 return NULL;
 429
 430         ret = acpi_bus_get_device(handle, &acpidev);
 431         if (ret)
 432                 return NULL;
 433
 434         ret = acpi_video_get_edid(acpidev, type, -1, &edid);
 435         if (ret < 0)
 436                 return NULL;
 437
 438         return kmemdup(edid, EDID_LENGTH, GFP_KERNEL);
 439 }