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 static int nouveau_dsm(acpi_handle handle, int func, int arg)
 110 {
 111         int ret = 0;
 112         union acpi_object *obj;
 113         union acpi_object argv4 = {
 114                 .integer.type = ACPI_TYPE_INTEGER,
 115                 .integer.value = arg,
 116         };
 117
 118         obj = acpi_evaluate_dsm_typed(handle, nouveau_dsm_muid, 0x00000102,
 119                                       func, &argv4, ACPI_TYPE_INTEGER);
 120         if (!obj) {
 121                 acpi_handle_info(handle, "failed to evaluate _DSM\n");
 122                 return AE_ERROR;
 123         } else {
 124                 if (obj->integer.value == 0x80000002)
 125                         ret = -ENODEV;
 126                 ACPI_FREE(obj);
 127         }
 128
 129         return ret;
 130 }
 131
 132 static int nouveau_dsm_switch_mux(acpi_handle handle, int mux_id)
 133 {
 134         mxm_wmi_call_mxmx(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
 135         mxm_wmi_call_mxds(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
 136         return nouveau_dsm(handle, NOUVEAU_DSM_LED, mux_id);
 137 }
 138
 139 static int nouveau_dsm_set_discrete_state(acpi_handle handle, enum vga_switcheroo_state state)
 140 {
 141         int arg;
 142         if (state == VGA_SWITCHEROO_ON)
 143                 arg = NOUVEAU_DSM_POWER_SPEED;
 144         else
 145                 arg = NOUVEAU_DSM_POWER_STAMINA;
 146         nouveau_dsm(handle, NOUVEAU_DSM_POWER, arg);
 147         return 0;
 148 }
 149
 150 static int nouveau_dsm_switchto(enum vga_switcheroo_client_id id)
 151 {
 152         if (!nouveau_dsm_priv.dsm_detected)
 153                 return 0;
 154         if (id == VGA_SWITCHEROO_IGD)
 155                 return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_STAMINA);
 156         else
 157                 return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_SPEED);
 158 }
 159
 160 static int nouveau_dsm_power_state(enum vga_switcheroo_client_id id,
 161                                    enum vga_switcheroo_state state)
 162 {
 163         if (id == VGA_SWITCHEROO_IGD)
 164                 return 0;
 165
 166         /* Optimus laptops have the card already disabled in
 167          * nouveau_switcheroo_set_state */
 168         if (!nouveau_dsm_priv.dsm_detected)
 169                 return 0;
 170
 171         return nouveau_dsm_set_discrete_state(nouveau_dsm_priv.dhandle, state);
 172 }
 173
 174 static int nouveau_dsm_get_client_id(struct pci_dev *pdev)
 175 {
 176         /* easy option one - intel vendor ID means Integrated */
 177         if (pdev->vendor == PCI_VENDOR_ID_INTEL)
 178                 return VGA_SWITCHEROO_IGD;
 179
 180         /* is this device on Bus 0? - this may need improving */
 181         if (pdev->bus->number == 0)
 182                 return VGA_SWITCHEROO_IGD;
 183
 184         return VGA_SWITCHEROO_DIS;
 185 }
 186
 187 static struct vga_switcheroo_handler nouveau_dsm_handler = {
 188         .switchto = nouveau_dsm_switchto,
 189         .power_state = nouveau_dsm_power_state,
 190         .get_client_id = nouveau_dsm_get_client_id,
 191 };
 192
 193 static int nouveau_dsm_pci_probe(struct pci_dev *pdev)
 194 {
 195         acpi_handle dhandle;
 196         int retval = 0;
 197
 198         dhandle = ACPI_HANDLE(&pdev->dev);
 199         if (!dhandle)
 200                 return false;
 201
 202         if (!acpi_has_method(dhandle, "_DSM")) {
 203                 nouveau_dsm_priv.other_handle = dhandle;
 204                 return false;
 205         }
 206         if (acpi_check_dsm(dhandle, nouveau_dsm_muid, 0x00000102,
 207                            1 << NOUVEAU_DSM_POWER))
 208                 retval |= NOUVEAU_DSM_HAS_MUX;
 209
 210         if (acpi_check_dsm(dhandle, nouveau_op_dsm_muid, 0x00000100,
 211                            1 << NOUVEAU_DSM_OPTIMUS_CAPS))
 212                 retval |= NOUVEAU_DSM_HAS_OPT;
 213
 214         if (retval & NOUVEAU_DSM_HAS_OPT) {
 215                 uint32_t result;
 216                 nouveau_optimus_dsm(dhandle, NOUVEAU_DSM_OPTIMUS_CAPS, 0,
 217                                     &result);
 218                 dev_info(&pdev->dev, "optimus capabilities: %s, status %s%s\n",
 219                          (result & OPTIMUS_ENABLED) ? "enabled" : "disabled",
 220                          (result & OPTIMUS_DYNAMIC_PWR_CAP) ? "dynamic power, " : "",
 221                          (result & OPTIMUS_HDA_CODEC_MASK) ? "hda bios codec supported" : "");
 222         }
 223         if (retval)
 224                 nouveau_dsm_priv.dhandle = dhandle;
 225
 226         return retval;
 227 }
 228
 229 static bool nouveau_dsm_detect(void)
 230 {
 231         char acpi_method_name[255] = { 0 };
 232         struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
 233         struct pci_dev *pdev = NULL;
 234         int has_dsm = 0;
 235         int has_optimus = 0;
 236         int vga_count = 0;
 237         bool guid_valid;
 238         int retval;
 239         bool ret = false;
 240
 241         /* lookup the MXM GUID */
 242         guid_valid = mxm_wmi_supported();
 243
 244         if (guid_valid)
 245                 printk("MXM: GUID detected in BIOS\n");
 246
 247         /* now do DSM detection */
 248         while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
 249                 vga_count++;
 250
 251                 retval = nouveau_dsm_pci_probe(pdev);
 252                 if (retval & NOUVEAU_DSM_HAS_MUX)
 253                         has_dsm |= 1;
 254                 if (retval & NOUVEAU_DSM_HAS_OPT)
 255                         has_optimus = 1;
 256         }
 257
 258         while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_3D << 8, pdev)) != NULL) {
 259                 vga_count++;
 260
 261                 retval = nouveau_dsm_pci_probe(pdev);
 262                 if (retval & NOUVEAU_DSM_HAS_MUX)
 263                         has_dsm |= 1;
 264                 if (retval & NOUVEAU_DSM_HAS_OPT)
 265                         has_optimus = 1;
 266         }
 267
 268         /* find the optimus DSM or the old v1 DSM */
 269         if (has_optimus == 1) {
 270                 acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
 271                         &buffer);
 272                 printk(KERN_INFO "VGA switcheroo: detected Optimus DSM method %s handle\n",
 273                         acpi_method_name);
 274                 nouveau_dsm_priv.optimus_detected = true;
 275                 ret = true;
 276         } else if (vga_count == 2 && has_dsm && guid_valid) {
 277                 acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
 278                         &buffer);
 279                 printk(KERN_INFO "VGA switcheroo: detected DSM switching method %s handle\n",
 280                         acpi_method_name);
 281                 nouveau_dsm_priv.dsm_detected = true;
 282                 /*
 283                  * On some systems hotplug events are generated for the device
 284                  * being switched off when _DSM is executed.  They cause ACPI
 285                  * hotplug to trigger and attempt to remove the device from
 286                  * the system, which causes it to break down.  Prevent that from
 287                  * happening by setting the no_hotplug flag for the involved
 288                  * ACPI device objects.
 289                  */
 290                 acpi_bus_no_hotplug(nouveau_dsm_priv.dhandle);
 291                 acpi_bus_no_hotplug(nouveau_dsm_priv.other_handle);
 292                 ret = true;
 293         }
 294
 295
 296         return ret;
 297 }
 298
 299 void nouveau_register_dsm_handler(void)
 300 {
 301         bool r;
 302
 303         r = nouveau_dsm_detect();
 304         if (!r)
 305                 return;
 306
 307         vga_switcheroo_register_handler(&nouveau_dsm_handler);
 308 }
 309
 310 /* Must be called for Optimus models before the card can be turned off */
 311 void nouveau_switcheroo_optimus_dsm(void)
 312 {
 313         u32 result = 0;
 314         if (!nouveau_dsm_priv.optimus_detected)
 315                 return;
 316
 317         nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_FLAGS,
 318                             0x3, &result);
 319
 320         nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_CAPS,
 321                 NOUVEAU_DSM_OPTIMUS_SET_POWERDOWN, &result);
 322
 323 }
 324
 325 void nouveau_unregister_dsm_handler(void)
 326 {
 327         if (nouveau_dsm_priv.optimus_detected || nouveau_dsm_priv.dsm_detected)
 328                 vga_switcheroo_unregister_handler();
 329 }
 330 #else
 331 void nouveau_register_dsm_handler(void) {}
 332 void nouveau_unregister_dsm_handler(void) {}
 333 void nouveau_switcheroo_optimus_dsm(void) {}
 334 #endif
 335
 336 /* retrieve the ROM in 4k blocks */
 337 static int nouveau_rom_call(acpi_handle rom_handle, uint8_t *bios,
 338                             int offset, int len)
 339 {
 340         acpi_status status;
 341         union acpi_object rom_arg_elements[2], *obj;
 342         struct acpi_object_list rom_arg;
 343         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL};
 344
 345         rom_arg.count = 2;
 346         rom_arg.pointer = &rom_arg_elements[0];
 347
 348         rom_arg_elements[0].type = ACPI_TYPE_INTEGER;
 349         rom_arg_elements[0].integer.value = offset;
 350
 351         rom_arg_elements[1].type = ACPI_TYPE_INTEGER;
 352         rom_arg_elements[1].integer.value = len;
 353
 354         status = acpi_evaluate_object(rom_handle, NULL, &rom_arg, &buffer);
 355         if (ACPI_FAILURE(status)) {
 356                 printk(KERN_INFO "failed to evaluate ROM got %s\n", acpi_format_exception(status));
 357                 return -ENODEV;
 358         }
 359         obj = (union acpi_object *)buffer.pointer;
 360         memcpy(bios+offset, obj->buffer.pointer, len);
 361         kfree(buffer.pointer);
 362         return len;
 363 }
 364
 365 bool nouveau_acpi_rom_supported(struct pci_dev *pdev)
 366 {
 367         acpi_status status;
 368         acpi_handle dhandle, rom_handle;
 369
 370         if (!nouveau_dsm_priv.dsm_detected && !nouveau_dsm_priv.optimus_detected)
 371                 return false;
 372
 373         dhandle = ACPI_HANDLE(&pdev->dev);
 374         if (!dhandle)
 375                 return false;
 376
 377         status = acpi_get_handle(dhandle, "_ROM", &rom_handle);
 378         if (ACPI_FAILURE(status))
 379                 return false;
 380
 381         nouveau_dsm_priv.rom_handle = rom_handle;
 382         return true;
 383 }
 384
 385 int nouveau_acpi_get_bios_chunk(uint8_t *bios, int offset, int len)
 386 {
 387         return nouveau_rom_call(nouveau_dsm_priv.rom_handle, bios, offset, len);
 388 }
 389
 390 void *
 391 nouveau_acpi_edid(struct drm_device *dev, struct drm_connector *connector)
 392 {
 393         struct acpi_device *acpidev;
 394         acpi_handle handle;
 395         int type, ret;
 396         void *edid;
 397
 398         switch (connector->connector_type) {
 399         case DRM_MODE_CONNECTOR_LVDS:
 400         case DRM_MODE_CONNECTOR_eDP:
 401                 type = ACPI_VIDEO_DISPLAY_LCD;
 402                 break;
 403         default:
 404                 return NULL;
 405         }
 406
 407         handle = ACPI_HANDLE(&dev->pdev->dev);
 408         if (!handle)
 409                 return NULL;
 410
 411         ret = acpi_bus_get_device(handle, &acpidev);
 412         if (ret)
 413                 return NULL;
 414
 415         ret = acpi_video_get_edid(acpidev, type, -1, &edid);
 416         if (ret < 0)
 417                 return NULL;
 418
 419         return kmemdup(edid, EDID_LENGTH, GFP_KERNEL);
 420 }