drivers/gpu/drm/nouveau/nouveau_acpi.c

   1 #include <linux/pci.h>
   2 #include <linux/acpi.h>
   3 #include <linux/slab.h>
   4 #include <acpi/acpi_drivers.h>
   5 #include <acpi/acpi_bus.h>
   6 #include <acpi/video.h>
   7 #include <acpi/acpi.h>
   8 #include <linux/mxm-wmi.h>
   9
  10 #include <linux/vga_switcheroo.h>
  11
  12 #include <drm/drm_edid.h>
  13
  14 #include "nouveau_drm.h"
  15 #include "nouveau_acpi.h"
  16
  17 #define NOUVEAU_DSM_LED 0x02
  18 #define NOUVEAU_DSM_LED_STATE 0x00
  19 #define NOUVEAU_DSM_LED_OFF 0x10
  20 #define NOUVEAU_DSM_LED_STAMINA 0x11
  21 #define NOUVEAU_DSM_LED_SPEED 0x12
  22
  23 #define NOUVEAU_DSM_POWER 0x03
  24 #define NOUVEAU_DSM_POWER_STATE 0x00
  25 #define NOUVEAU_DSM_POWER_SPEED 0x01
  26 #define NOUVEAU_DSM_POWER_STAMINA 0x02
  27
  28 #define NOUVEAU_DSM_OPTIMUS_FN 0x1A
  29 #define NOUVEAU_DSM_OPTIMUS_ARGS 0x03000001
  30
  31 static struct nouveau_dsm_priv {
  32         bool dsm_detected;
  33         bool optimus_detected;
  34         acpi_handle dhandle;
  35         acpi_handle rom_handle;
  36 } nouveau_dsm_priv;
  37
  38 bool nouveau_is_optimus(void) {
  39         return nouveau_dsm_priv.optimus_detected;
  40 }
  41
  42 bool nouveau_is_v1_dsm(void) {
  43         return nouveau_dsm_priv.dsm_detected;
  44 }
  45
  46 #define NOUVEAU_DSM_HAS_MUX 0x1
  47 #define NOUVEAU_DSM_HAS_OPT 0x2
  48
  49 static const char nouveau_dsm_muid[] = {
  50         0xA0, 0xA0, 0x95, 0x9D, 0x60, 0x00, 0x48, 0x4D,
  51         0xB3, 0x4D, 0x7E, 0x5F, 0xEA, 0x12, 0x9F, 0xD4,
  52 };
  53
  54 static const char nouveau_op_dsm_muid[] = {
  55         0xF8, 0xD8, 0x86, 0xA4, 0xDA, 0x0B, 0x1B, 0x47,
  56         0xA7, 0x2B, 0x60, 0x42, 0xA6, 0xB5, 0xBE, 0xE0,
  57 };
  58
  59 static int nouveau_optimus_dsm(acpi_handle handle, int func, int arg, uint32_t *result)
  60 {
  61         struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
  62         struct acpi_object_list input;
  63         union acpi_object params[4];
  64         union acpi_object *obj;
  65         int i, err;
  66         char args_buff[4];
  67
  68         input.count = 4;
  69         input.pointer = params;
  70         params[0].type = ACPI_TYPE_BUFFER;
  71         params[0].buffer.length = sizeof(nouveau_op_dsm_muid);
  72         params[0].buffer.pointer = (char *)nouveau_op_dsm_muid;
  73         params[1].type = ACPI_TYPE_INTEGER;
  74         params[1].integer.value = 0x00000100;
  75         params[2].type = ACPI_TYPE_INTEGER;
  76         params[2].integer.value = func;
  77         params[3].type = ACPI_TYPE_BUFFER;
  78         params[3].buffer.length = 4;
  79         /* ACPI is little endian, AABBCCDD becomes {DD,CC,BB,AA} */
  80         for (i = 0; i < 4; i++)
  81                 args_buff[i] = (arg >> i * 8) & 0xFF;
  82         params[3].buffer.pointer = args_buff;
  83
  84         err = acpi_evaluate_object(handle, "_DSM", &input, &output);
  85         if (err) {
  86                 printk(KERN_INFO "failed to evaluate _DSM: %d\n", err);
  87                 return err;
  88         }
  89
  90         obj = (union acpi_object *)output.pointer;
  91
  92         if (obj->type == ACPI_TYPE_INTEGER)
  93                 if (obj->integer.value == 0x80000002) {
  94                         return -ENODEV;
  95                 }
  96
  97         if (obj->type == ACPI_TYPE_BUFFER) {
  98                 if (obj->buffer.length == 4 && result) {
  99                         *result = 0;
 100                         *result |= obj->buffer.pointer[0];
 101                         *result |= (obj->buffer.pointer[1] << 8);
 102                         *result |= (obj->buffer.pointer[2] << 16);
 103                         *result |= (obj->buffer.pointer[3] << 24);
 104                 }
 105         }
 106
 107         kfree(output.pointer);
 108         return 0;
 109 }
 110
 111 static int nouveau_dsm(acpi_handle handle, int func, int arg, uint32_t *result)
 112 {
 113         struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
 114         struct acpi_object_list input;
 115         union acpi_object params[4];
 116         union acpi_object *obj;
 117         int err;
 118
 119         input.count = 4;
 120         input.pointer = params;
 121         params[0].type = ACPI_TYPE_BUFFER;
 122         params[0].buffer.length = sizeof(nouveau_dsm_muid);
 123         params[0].buffer.pointer = (char *)nouveau_dsm_muid;
 124         params[1].type = ACPI_TYPE_INTEGER;
 125         params[1].integer.value = 0x00000102;
 126         params[2].type = ACPI_TYPE_INTEGER;
 127         params[2].integer.value = func;
 128         params[3].type = ACPI_TYPE_INTEGER;
 129         params[3].integer.value = arg;
 130
 131         err = acpi_evaluate_object(handle, "_DSM", &input, &output);
 132         if (err) {
 133                 printk(KERN_INFO "failed to evaluate _DSM: %d\n", err);
 134                 return err;
 135         }
 136
 137         obj = (union acpi_object *)output.pointer;
 138
 139         if (obj->type == ACPI_TYPE_INTEGER)
 140                 if (obj->integer.value == 0x80000002)
 141                         return -ENODEV;
 142
 143         if (obj->type == ACPI_TYPE_BUFFER) {
 144                 if (obj->buffer.length == 4 && result) {
 145                         *result = 0;
 146                         *result |= obj->buffer.pointer[0];
 147                         *result |= (obj->buffer.pointer[1] << 8);
 148                         *result |= (obj->buffer.pointer[2] << 16);
 149                         *result |= (obj->buffer.pointer[3] << 24);
 150                 }
 151         }
 152
 153         kfree(output.pointer);
 154         return 0;
 155 }
 156
 157 /* Returns 1 if a DSM function is usable and 0 otherwise */
 158 static int nouveau_test_dsm(acpi_handle test_handle,
 159         int (*dsm_func)(acpi_handle, int, int, uint32_t *),
 160         int sfnc)
 161 {
 162         u32 result = 0;
 163
 164         /* Function 0 returns a Buffer containing available functions. The args
 165          * parameter is ignored for function 0, so just put 0 in it */
 166         if (dsm_func(test_handle, 0, 0, &result))
 167                 return 0;
 168
 169         /* ACPI Spec v4 9.14.1: if bit 0 is zero, no function is supported. If
 170          * the n-th bit is enabled, function n is supported */
 171         return result & 1 && result & (1 << sfnc);
 172 }
 173
 174 static int nouveau_dsm_switch_mux(acpi_handle handle, int mux_id)
 175 {
 176         mxm_wmi_call_mxmx(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
 177         mxm_wmi_call_mxds(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
 178         return nouveau_dsm(handle, NOUVEAU_DSM_LED, mux_id, NULL);
 179 }
 180
 181 static int nouveau_dsm_set_discrete_state(acpi_handle handle, enum vga_switcheroo_state state)
 182 {
 183         int arg;
 184         if (state == VGA_SWITCHEROO_ON)
 185                 arg = NOUVEAU_DSM_POWER_SPEED;
 186         else
 187                 arg = NOUVEAU_DSM_POWER_STAMINA;
 188         nouveau_dsm(handle, NOUVEAU_DSM_POWER, arg, NULL);
 189         return 0;
 190 }
 191
 192 static int nouveau_dsm_switchto(enum vga_switcheroo_client_id id)
 193 {
 194         if (!nouveau_dsm_priv.dsm_detected)
 195                 return 0;
 196         if (id == VGA_SWITCHEROO_IGD)
 197                 return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_STAMINA);
 198         else
 199                 return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_SPEED);
 200 }
 201
 202 static int nouveau_dsm_power_state(enum vga_switcheroo_client_id id,
 203                                    enum vga_switcheroo_state state)
 204 {
 205         if (id == VGA_SWITCHEROO_IGD)
 206                 return 0;
 207
 208         /* Optimus laptops have the card already disabled in
 209          * nouveau_switcheroo_set_state */
 210         if (!nouveau_dsm_priv.dsm_detected)
 211                 return 0;
 212
 213         return nouveau_dsm_set_discrete_state(nouveau_dsm_priv.dhandle, state);
 214 }
 215
 216 static int nouveau_dsm_get_client_id(struct pci_dev *pdev)
 217 {
 218         /* easy option one - intel vendor ID means Integrated */
 219         if (pdev->vendor == PCI_VENDOR_ID_INTEL)
 220                 return VGA_SWITCHEROO_IGD;
 221
 222         /* is this device on Bus 0? - this may need improving */
 223         if (pdev->bus->number == 0)
 224                 return VGA_SWITCHEROO_IGD;
 225
 226         return VGA_SWITCHEROO_DIS;
 227 }
 228
 229 static struct vga_switcheroo_handler nouveau_dsm_handler = {
 230         .switchto = nouveau_dsm_switchto,
 231         .power_state = nouveau_dsm_power_state,
 232         .get_client_id = nouveau_dsm_get_client_id,
 233 };
 234
 235 static int nouveau_dsm_pci_probe(struct pci_dev *pdev)
 236 {
 237         acpi_handle dhandle, nvidia_handle;
 238         acpi_status status;
 239         int retval = 0;
 240
 241         dhandle = DEVICE_ACPI_HANDLE(&pdev->dev);
 242         if (!dhandle)
 243                 return false;
 244
 245         status = acpi_get_handle(dhandle, "_DSM", &nvidia_handle);
 246         if (ACPI_FAILURE(status)) {
 247                 return false;
 248         }
 249
 250         if (nouveau_test_dsm(dhandle, nouveau_dsm, NOUVEAU_DSM_POWER))
 251                 retval |= NOUVEAU_DSM_HAS_MUX;
 252
 253         if (nouveau_test_dsm(dhandle, nouveau_optimus_dsm,
 254                 NOUVEAU_DSM_OPTIMUS_FN))
 255                 retval |= NOUVEAU_DSM_HAS_OPT;
 256
 257         if (retval)
 258                 nouveau_dsm_priv.dhandle = dhandle;
 259
 260         return retval;
 261 }
 262
 263 static bool nouveau_dsm_detect(void)
 264 {
 265         char acpi_method_name[255] = { 0 };
 266         struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
 267         struct pci_dev *pdev = NULL;
 268         int has_dsm = 0;
 269         int has_optimus = 0;
 270         int vga_count = 0;
 271         bool guid_valid;
 272         int retval;
 273         bool ret = false;
 274
 275         /* lookup the MXM GUID */
 276         guid_valid = mxm_wmi_supported();
 277
 278         if (guid_valid)
 279                 printk("MXM: GUID detected in BIOS\n");
 280
 281         /* now do DSM detection */
 282         while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
 283                 vga_count++;
 284
 285                 retval = nouveau_dsm_pci_probe(pdev);
 286                 if (retval & NOUVEAU_DSM_HAS_MUX)
 287                         has_dsm |= 1;
 288                 if (retval & NOUVEAU_DSM_HAS_OPT)
 289                         has_optimus = 1;
 290         }
 291
 292         /* find the optimus DSM or the old v1 DSM */
 293         if (has_optimus == 1) {
 294                 acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
 295                         &buffer);
 296                 printk(KERN_INFO "VGA switcheroo: detected Optimus DSM method %s handle\n",
 297                         acpi_method_name);
 298                 nouveau_dsm_priv.optimus_detected = true;
 299                 ret = true;
 300         } else if (vga_count == 2 && has_dsm && guid_valid) {
 301                 acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
 302                         &buffer);
 303                 printk(KERN_INFO "VGA switcheroo: detected DSM switching method %s handle\n",
 304                         acpi_method_name);
 305                 nouveau_dsm_priv.dsm_detected = true;
 306                 ret = true;
 307         }
 308
 309
 310         return ret;
 311 }
 312
 313 void nouveau_register_dsm_handler(void)
 314 {
 315         bool r;
 316
 317         r = nouveau_dsm_detect();
 318         if (!r)
 319                 return;
 320
 321         vga_switcheroo_register_handler(&nouveau_dsm_handler);
 322 }
 323
 324 /* Must be called for Optimus models before the card can be turned off */
 325 void nouveau_switcheroo_optimus_dsm(void)
 326 {
 327         u32 result = 0;
 328         if (!nouveau_dsm_priv.optimus_detected)
 329                 return;
 330
 331         nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_FN,
 332                 NOUVEAU_DSM_OPTIMUS_ARGS, &result);
 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
 341 /* retrieve the ROM in 4k blocks */
 342 static int nouveau_rom_call(acpi_handle rom_handle, uint8_t *bios,
 343                             int offset, int len)
 344 {
 345         acpi_status status;
 346         union acpi_object rom_arg_elements[2], *obj;
 347         struct acpi_object_list rom_arg;
 348         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL};
 349
 350         rom_arg.count = 2;
 351         rom_arg.pointer = &rom_arg_elements[0];
 352
 353         rom_arg_elements[0].type = ACPI_TYPE_INTEGER;
 354         rom_arg_elements[0].integer.value = offset;
 355
 356         rom_arg_elements[1].type = ACPI_TYPE_INTEGER;
 357         rom_arg_elements[1].integer.value = len;
 358
 359         status = acpi_evaluate_object(rom_handle, NULL, &rom_arg, &buffer);
 360         if (ACPI_FAILURE(status)) {
 361                 printk(KERN_INFO "failed to evaluate ROM got %s\n", acpi_format_exception(status));
 362                 return -ENODEV;
 363         }
 364         obj = (union acpi_object *)buffer.pointer;
 365         memcpy(bios+offset, obj->buffer.pointer, len);
 366         kfree(buffer.pointer);
 367         return len;
 368 }
 369
 370 bool nouveau_acpi_rom_supported(struct pci_dev *pdev)
 371 {
 372         acpi_status status;
 373         acpi_handle dhandle, rom_handle;
 374
 375         if (!nouveau_dsm_priv.dsm_detected && !nouveau_dsm_priv.optimus_detected)
 376                 return false;
 377
 378         dhandle = DEVICE_ACPI_HANDLE(&pdev->dev);
 379         if (!dhandle)
 380                 return false;
 381
 382         status = acpi_get_handle(dhandle, "_ROM", &rom_handle);
 383         if (ACPI_FAILURE(status))
 384                 return false;
 385
 386         nouveau_dsm_priv.rom_handle = rom_handle;
 387         return true;
 388 }
 389
 390 int nouveau_acpi_get_bios_chunk(uint8_t *bios, int offset, int len)
 391 {
 392         return nouveau_rom_call(nouveau_dsm_priv.rom_handle, bios, offset, len);
 393 }
 394
 395 void *
 396 nouveau_acpi_edid(struct drm_device *dev, struct drm_connector *connector)
 397 {
 398         struct acpi_device *acpidev;
 399         acpi_handle handle;
 400         int type, ret;
 401         void *edid;
 402
 403         switch (connector->connector_type) {
 404         case DRM_MODE_CONNECTOR_LVDS:
 405         case DRM_MODE_CONNECTOR_eDP:
 406                 type = ACPI_VIDEO_DISPLAY_LCD;
 407                 break;
 408         default:
 409                 return NULL;
 410         }
 411
 412         handle = DEVICE_ACPI_HANDLE(&dev->pdev->dev);
 413         if (!handle)
 414                 return NULL;
 415
 416         ret = acpi_bus_get_device(handle, &acpidev);
 417         if (ret)
 418                 return NULL;
 419
 420         ret = acpi_video_get_edid(acpidev, type, -1, &edid);
 421         if (ret < 0)
 422                 return NULL;
 423
 424         return kmemdup(edid, EDID_LENGTH, GFP_KERNEL);
 425 }