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 #ifdef CONFIG_VGA_SWITCHEROO
  64 static const char nouveau_dsm_muid[] = {
  65         0xA0, 0xA0, 0x95, 0x9D, 0x60, 0x00, 0x48, 0x4D,
  66         0xB3, 0x4D, 0x7E, 0x5F, 0xEA, 0x12, 0x9F, 0xD4,
  67 };
  68
  69 static const char nouveau_op_dsm_muid[] = {
  70         0xF8, 0xD8, 0x86, 0xA4, 0xDA, 0x0B, 0x1B, 0x47,
  71         0xA7, 0x2B, 0x60, 0x42, 0xA6, 0xB5, 0xBE, 0xE0,
  72 };
  73
  74 static int nouveau_optimus_dsm(acpi_handle handle, int func, int arg, uint32_t *result)
  75 {
  76         int i;
  77         union acpi_object *obj;
  78         char args_buff[4];
  79         union acpi_object argv4 = {
  80                 .buffer.type = ACPI_TYPE_BUFFER,
  81                 .buffer.length = 4,
  82                 .buffer.pointer = args_buff
  83         };
  84
  85         /* ACPI is little endian, AABBCCDD becomes {DD,CC,BB,AA} */
  86         for (i = 0; i < 4; i++)
  87                 args_buff[i] = (arg >> i * 8) & 0xFF;
  88
  89         *result = 0;
  90         obj = acpi_evaluate_dsm_typed(handle, nouveau_op_dsm_muid, 0x00000100,
  91                                       func, &argv4, ACPI_TYPE_BUFFER);
  92         if (!obj) {
  93                 acpi_handle_info(handle, "failed to evaluate _DSM\n");
  94                 return AE_ERROR;
  95         } else {
  96                 if (obj->buffer.length == 4) {
  97                         *result |= obj->buffer.pointer[0];
  98                         *result |= (obj->buffer.pointer[1] << 8);
  99                         *result |= (obj->buffer.pointer[2] << 16);
 100                         *result |= (obj->buffer.pointer[3] << 24);
 101                 }
 102                 ACPI_FREE(obj);
 103         }
 104
 105         return 0;
 106 }
 107
 108 /*
 109  * On some platforms, _DSM(nouveau_op_dsm_muid, func0) has special
 110  * requirements on the fourth parameter, so a private implementation
 111  * instead of using acpi_check_dsm().
 112  */
 113 static int nouveau_check_optimus_dsm(acpi_handle handle)
 114 {
 115         int result;
 116
 117         /*
 118          * Function 0 returns a Buffer containing available functions.
 119          * The args parameter is ignored for function 0, so just put 0 in it
 120          */
 121         if (nouveau_optimus_dsm(handle, 0, 0, &result))
 122                 return 0;
 123
 124         /*
 125          * ACPI Spec v4 9.14.1: if bit 0 is zero, no function is supported.
 126          * If the n-th bit is enabled, function n is supported
 127          */
 128         return result & 1 && result & (1 << NOUVEAU_DSM_OPTIMUS_CAPS);
 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 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 int nouveau_dsm_pci_probe(struct pci_dev *pdev)
 216 {
 217         acpi_handle dhandle;
 218         int retval = 0;
 219
 220         dhandle = ACPI_HANDLE(&pdev->dev);
 221         if (!dhandle)
 222                 return false;
 223
 224         if (!acpi_has_method(dhandle, "_DSM"))
 225                 return false;
 226
 227         if (acpi_check_dsm(dhandle, nouveau_dsm_muid, 0x00000102,
 228                            1 << NOUVEAU_DSM_POWER))
 229                 retval |= NOUVEAU_DSM_HAS_MUX;
 230
 231         if (nouveau_check_optimus_dsm(dhandle))
 232                 retval |= NOUVEAU_DSM_HAS_OPT;
 233
 234         if (retval & NOUVEAU_DSM_HAS_OPT) {
 235                 uint32_t result;
 236                 nouveau_optimus_dsm(dhandle, NOUVEAU_DSM_OPTIMUS_CAPS, 0,
 237                                     &result);
 238                 dev_info(&pdev->dev, "optimus capabilities: %s, status %s%s\n",
 239                          (result & OPTIMUS_ENABLED) ? "enabled" : "disabled",
 240                          (result & OPTIMUS_DYNAMIC_PWR_CAP) ? "dynamic power, " : "",
 241                          (result & OPTIMUS_HDA_CODEC_MASK) ? "hda bios codec supported" : "");
 242         }
 243         if (retval)
 244                 nouveau_dsm_priv.dhandle = dhandle;
 245
 246         return retval;
 247 }
 248
 249 static bool nouveau_dsm_detect(void)
 250 {
 251         char acpi_method_name[255] = { 0 };
 252         struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
 253         struct pci_dev *pdev = NULL;
 254         int has_dsm = 0;
 255         int has_optimus = 0;
 256         int vga_count = 0;
 257         bool guid_valid;
 258         int retval;
 259         bool ret = false;
 260
 261         /* lookup the MXM GUID */
 262         guid_valid = mxm_wmi_supported();
 263
 264         if (guid_valid)
 265                 printk("MXM: GUID detected in BIOS\n");
 266
 267         /* now do DSM detection */
 268         while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
 269                 vga_count++;
 270
 271                 retval = nouveau_dsm_pci_probe(pdev);
 272                 if (retval & NOUVEAU_DSM_HAS_MUX)
 273                         has_dsm |= 1;
 274                 if (retval & NOUVEAU_DSM_HAS_OPT)
 275                         has_optimus = 1;
 276         }
 277
 278         while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_3D << 8, pdev)) != NULL) {
 279                 vga_count++;
 280
 281                 retval = nouveau_dsm_pci_probe(pdev);
 282                 if (retval & NOUVEAU_DSM_HAS_MUX)
 283                         has_dsm |= 1;
 284                 if (retval & NOUVEAU_DSM_HAS_OPT)
 285                         has_optimus = 1;
 286         }
 287
 288         /* find the optimus DSM or the old v1 DSM */
 289         if (has_optimus == 1) {
 290                 acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
 291                         &buffer);
 292                 printk(KERN_INFO "VGA switcheroo: detected Optimus DSM method %s handle\n",
 293                         acpi_method_name);
 294                 nouveau_dsm_priv.optimus_detected = true;
 295                 ret = true;
 296         } else if (vga_count == 2 && has_dsm && guid_valid) {
 297                 acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
 298                         &buffer);
 299                 printk(KERN_INFO "VGA switcheroo: detected DSM switching method %s handle\n",
 300                         acpi_method_name);
 301                 nouveau_dsm_priv.dsm_detected = true;
 302                 ret = true;
 303         }
 304
 305
 306         return ret;
 307 }
 308
 309 void nouveau_register_dsm_handler(void)
 310 {
 311         bool r;
 312
 313         r = nouveau_dsm_detect();
 314         if (!r)
 315                 return;
 316
 317         vga_switcheroo_register_handler(&nouveau_dsm_handler);
 318 }
 319
 320 /* Must be called for Optimus models before the card can be turned off */
 321 void nouveau_switcheroo_optimus_dsm(void)
 322 {
 323         u32 result = 0;
 324         if (!nouveau_dsm_priv.optimus_detected)
 325                 return;
 326
 327         nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_FLAGS,
 328                             0x3, &result);
 329
 330         nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_CAPS,
 331                 NOUVEAU_DSM_OPTIMUS_SET_POWERDOWN, &result);
 332
 333 }
 334
 335 void nouveau_unregister_dsm_handler(void)
 336 {
 337         if (nouveau_dsm_priv.optimus_detected || nouveau_dsm_priv.dsm_detected)
 338                 vga_switcheroo_unregister_handler();
 339 }
 340 #else
 341 void nouveau_register_dsm_handler(void) {}
 342 void nouveau_unregister_dsm_handler(void) {}
 343 void nouveau_switcheroo_optimus_dsm(void) {}
 344 #endif
 345
 346 /* retrieve the ROM in 4k blocks */
 347 static int nouveau_rom_call(acpi_handle rom_handle, uint8_t *bios,
 348                             int offset, int len)
 349 {
 350         acpi_status status;
 351         union acpi_object rom_arg_elements[2], *obj;
 352         struct acpi_object_list rom_arg;
 353         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL};
 354
 355         rom_arg.count = 2;
 356         rom_arg.pointer = &rom_arg_elements[0];
 357
 358         rom_arg_elements[0].type = ACPI_TYPE_INTEGER;
 359         rom_arg_elements[0].integer.value = offset;
 360
 361         rom_arg_elements[1].type = ACPI_TYPE_INTEGER;
 362         rom_arg_elements[1].integer.value = len;
 363
 364         status = acpi_evaluate_object(rom_handle, NULL, &rom_arg, &buffer);
 365         if (ACPI_FAILURE(status)) {
 366                 printk(KERN_INFO "failed to evaluate ROM got %s\n", acpi_format_exception(status));
 367                 return -ENODEV;
 368         }
 369         obj = (union acpi_object *)buffer.pointer;
 370         memcpy(bios+offset, obj->buffer.pointer, len);
 371         kfree(buffer.pointer);
 372         return len;
 373 }
 374
 375 bool nouveau_acpi_rom_supported(struct pci_dev *pdev)
 376 {
 377         acpi_status status;
 378         acpi_handle dhandle, rom_handle;
 379
 380         dhandle = ACPI_HANDLE(&pdev->dev);
 381         if (!dhandle)
 382                 return false;
 383
 384         status = acpi_get_handle(dhandle, "_ROM", &rom_handle);
 385         if (ACPI_FAILURE(status))
 386                 return false;
 387
 388         nouveau_dsm_priv.rom_handle = rom_handle;
 389         return true;
 390 }
 391
 392 int nouveau_acpi_get_bios_chunk(uint8_t *bios, int offset, int len)
 393 {
 394         return nouveau_rom_call(nouveau_dsm_priv.rom_handle, bios, offset, len);
 395 }
 396
 397 void *
 398 nouveau_acpi_edid(struct drm_device *dev, struct drm_connector *connector)
 399 {
 400         struct acpi_device *acpidev;
 401         acpi_handle handle;
 402         int type, ret;
 403         void *edid;
 404
 405         switch (connector->connector_type) {
 406         case DRM_MODE_CONNECTOR_LVDS:
 407         case DRM_MODE_CONNECTOR_eDP:
 408                 type = ACPI_VIDEO_DISPLAY_LCD;
 409                 break;
 410         default:
 411                 return NULL;
 412         }
 413
 414         handle = ACPI_HANDLE(&dev->pdev->dev);
 415         if (!handle)
 416                 return NULL;
 417
 418         ret = acpi_bus_get_device(handle, &acpidev);
 419         if (ret)
 420                 return NULL;
 421
 422         ret = acpi_video_get_edid(acpidev, type, -1, &edid);
 423         if (ret < 0)
 424                 return NULL;
 425
 426         return kmemdup(edid, EDID_LENGTH, GFP_KERNEL);
 427 }