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 "drmP.h"
  11 #include "drm.h"
  12 #include "drm_sarea.h"
  13 #include "drm_crtc_helper.h"
  14 #include "nouveau_drv.h"
  15 #include "nouveau_drm.h"
  16 #include "nv50_display.h"
  17 #include "nouveau_connector.h"
  18
  19 #include <linux/vga_switcheroo.h>
  20
  21 #define NOUVEAU_DSM_LED 0x02
  22 #define NOUVEAU_DSM_LED_STATE 0x00
  23 #define NOUVEAU_DSM_LED_OFF 0x10
  24 #define NOUVEAU_DSM_LED_STAMINA 0x11
  25 #define NOUVEAU_DSM_LED_SPEED 0x12
  26
  27 #define NOUVEAU_DSM_POWER 0x03
  28 #define NOUVEAU_DSM_POWER_STATE 0x00
  29 #define NOUVEAU_DSM_POWER_SPEED 0x01
  30 #define NOUVEAU_DSM_POWER_STAMINA 0x02
  31
  32 #define NOUVEAU_DSM_OPTIMUS_FN 0x1A
  33 #define NOUVEAU_DSM_OPTIMUS_ARGS 0x03000001
  34
  35 static struct nouveau_dsm_priv {
  36         bool dsm_detected;
  37         bool optimus_detected;
  38         acpi_handle dhandle;
  39         acpi_handle rom_handle;
  40 } nouveau_dsm_priv;
  41
  42 #define NOUVEAU_DSM_HAS_MUX 0x1
  43 #define NOUVEAU_DSM_HAS_OPT 0x2
  44
  45 static const char nouveau_dsm_muid[] = {
  46         0xA0, 0xA0, 0x95, 0x9D, 0x60, 0x00, 0x48, 0x4D,
  47         0xB3, 0x4D, 0x7E, 0x5F, 0xEA, 0x12, 0x9F, 0xD4,
  48 };
  49
  50 static const char nouveau_op_dsm_muid[] = {
  51         0xF8, 0xD8, 0x86, 0xA4, 0xDA, 0x0B, 0x1B, 0x47,
  52         0xA7, 0x2B, 0x60, 0x42, 0xA6, 0xB5, 0xBE, 0xE0,
  53 };
  54
  55 static int nouveau_optimus_dsm(acpi_handle handle, int func, int arg, uint32_t *result)
  56 {
  57         struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
  58         struct acpi_object_list input;
  59         union acpi_object params[4];
  60         union acpi_object *obj;
  61         int i, err;
  62         char args_buff[4];
  63
  64         input.count = 4;
  65         input.pointer = params;
  66         params[0].type = ACPI_TYPE_BUFFER;
  67         params[0].buffer.length = sizeof(nouveau_op_dsm_muid);
  68         params[0].buffer.pointer = (char *)nouveau_op_dsm_muid;
  69         params[1].type = ACPI_TYPE_INTEGER;
  70         params[1].integer.value = 0x00000100;
  71         params[2].type = ACPI_TYPE_INTEGER;
  72         params[2].integer.value = func;
  73         params[3].type = ACPI_TYPE_BUFFER;
  74         params[3].buffer.length = 4;
  75         /* ACPI is little endian, AABBCCDD becomes {DD,CC,BB,AA} */
  76         for (i = 0; i < 4; i++)
  77                 args_buff[i] = (arg >> i * 8) & 0xFF;
  78         params[3].buffer.pointer = args_buff;
  79
  80         err = acpi_evaluate_object(handle, "_DSM", &input, &output);
  81         if (err) {
  82                 printk(KERN_INFO "failed to evaluate _DSM: %d\n", err);
  83                 return err;
  84         }
  85
  86         obj = (union acpi_object *)output.pointer;
  87
  88         if (obj->type == ACPI_TYPE_INTEGER)
  89                 if (obj->integer.value == 0x80000002) {
  90                         return -ENODEV;
  91                 }
  92
  93         if (obj->type == ACPI_TYPE_BUFFER) {
  94                 if (obj->buffer.length == 4 && result) {
  95                         *result = 0;
  96                         *result |= obj->buffer.pointer[0];
  97                         *result |= (obj->buffer.pointer[1] << 8);
  98                         *result |= (obj->buffer.pointer[2] << 16);
  99                         *result |= (obj->buffer.pointer[3] << 24);
 100                 }
 101         }
 102
 103         kfree(output.pointer);
 104         return 0;
 105 }
 106
 107 static int nouveau_dsm(acpi_handle handle, int func, int arg, uint32_t *result)
 108 {
 109         struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
 110         struct acpi_object_list input;
 111         union acpi_object params[4];
 112         union acpi_object *obj;
 113         int err;
 114
 115         input.count = 4;
 116         input.pointer = params;
 117         params[0].type = ACPI_TYPE_BUFFER;
 118         params[0].buffer.length = sizeof(nouveau_dsm_muid);
 119         params[0].buffer.pointer = (char *)nouveau_dsm_muid;
 120         params[1].type = ACPI_TYPE_INTEGER;
 121         params[1].integer.value = 0x00000102;
 122         params[2].type = ACPI_TYPE_INTEGER;
 123         params[2].integer.value = func;
 124         params[3].type = ACPI_TYPE_INTEGER;
 125         params[3].integer.value = arg;
 126
 127         err = acpi_evaluate_object(handle, "_DSM", &input, &output);
 128         if (err) {
 129                 printk(KERN_INFO "failed to evaluate _DSM: %d\n", err);
 130                 return err;
 131         }
 132
 133         obj = (union acpi_object *)output.pointer;
 134
 135         if (obj->type == ACPI_TYPE_INTEGER)
 136                 if (obj->integer.value == 0x80000002)
 137                         return -ENODEV;
 138
 139         if (obj->type == ACPI_TYPE_BUFFER) {
 140                 if (obj->buffer.length == 4 && result) {
 141                         *result = 0;
 142                         *result |= obj->buffer.pointer[0];
 143                         *result |= (obj->buffer.pointer[1] << 8);
 144                         *result |= (obj->buffer.pointer[2] << 16);
 145                         *result |= (obj->buffer.pointer[3] << 24);
 146                 }
 147         }
 148
 149         kfree(output.pointer);
 150         return 0;
 151 }
 152
 153 /* Returns 1 if a DSM function is usable and 0 otherwise */
 154 static int nouveau_test_dsm(acpi_handle test_handle,
 155         int (*dsm_func)(acpi_handle, int, int, uint32_t *),
 156         int sfnc)
 157 {
 158         u32 result = 0;
 159
 160         /* Function 0 returns a Buffer containing available functions. The args
 161          * parameter is ignored for function 0, so just put 0 in it */
 162         if (dsm_func(test_handle, 0, 0, &result))
 163                 return 0;
 164
 165         /* ACPI Spec v4 9.14.1: if bit 0 is zero, no function is supported. If
 166          * the n-th bit is enabled, function n is supported */
 167         return result & 1 && result & (1 << sfnc);
 168 }
 169
 170 static int nouveau_dsm_switch_mux(acpi_handle handle, int mux_id)
 171 {
 172         mxm_wmi_call_mxmx(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
 173         mxm_wmi_call_mxds(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
 174         return nouveau_dsm(handle, NOUVEAU_DSM_LED, mux_id, NULL);
 175 }
 176
 177 static int nouveau_dsm_set_discrete_state(acpi_handle handle, enum vga_switcheroo_state state)
 178 {
 179         int arg;
 180         if (state == VGA_SWITCHEROO_ON)
 181                 arg = NOUVEAU_DSM_POWER_SPEED;
 182         else
 183                 arg = NOUVEAU_DSM_POWER_STAMINA;
 184         nouveau_dsm(handle, NOUVEAU_DSM_POWER, arg, NULL);
 185         return 0;
 186 }
 187
 188 static int nouveau_dsm_switchto(enum vga_switcheroo_client_id id)
 189 {
 190         /* perhaps the _DSM functions are mutually exclusive, but prepare for
 191          * the future */
 192         if (!nouveau_dsm_priv.dsm_detected && nouveau_dsm_priv.optimus_detected)
 193                 return 0;
 194         if (id == VGA_SWITCHEROO_IGD)
 195                 return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_STAMINA);
 196         else
 197                 return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_SPEED);
 198 }
 199
 200 static int nouveau_dsm_power_state(enum vga_switcheroo_client_id id,
 201                                    enum vga_switcheroo_state state)
 202 {
 203         if (id == VGA_SWITCHEROO_IGD)
 204                 return 0;
 205
 206         /* Optimus laptops have the card already disabled in
 207          * nouveau_switcheroo_set_state */
 208         if (!nouveau_dsm_priv.dsm_detected && nouveau_dsm_priv.optimus_detected)
 209                 return 0;
 210
 211         return nouveau_dsm_set_discrete_state(nouveau_dsm_priv.dhandle, state);
 212 }
 213
 214 static int nouveau_dsm_init(void)
 215 {
 216         return 0;
 217 }
 218
 219 static int nouveau_dsm_get_client_id(struct pci_dev *pdev)
 220 {
 221         /* easy option one - intel vendor ID means Integrated */
 222         if (pdev->vendor == PCI_VENDOR_ID_INTEL)
 223                 return VGA_SWITCHEROO_IGD;
 224
 225         /* is this device on Bus 0? - this may need improving */
 226         if (pdev->bus->number == 0)
 227                 return VGA_SWITCHEROO_IGD;
 228
 229         return VGA_SWITCHEROO_DIS;
 230 }
 231
 232 static struct vga_switcheroo_handler nouveau_dsm_handler = {
 233         .switchto = nouveau_dsm_switchto,
 234         .power_state = nouveau_dsm_power_state,
 235         .init = nouveau_dsm_init,
 236         .get_client_id = nouveau_dsm_get_client_id,
 237 };
 238
 239 static int nouveau_dsm_pci_probe(struct pci_dev *pdev)
 240 {
 241         acpi_handle dhandle, nvidia_handle;
 242         acpi_status status;
 243         int retval = 0;
 244
 245         dhandle = DEVICE_ACPI_HANDLE(&pdev->dev);
 246         if (!dhandle)
 247                 return false;
 248
 249         status = acpi_get_handle(dhandle, "_DSM", &nvidia_handle);
 250         if (ACPI_FAILURE(status)) {
 251                 return false;
 252         }
 253
 254         if (nouveau_test_dsm(dhandle, nouveau_dsm, NOUVEAU_DSM_POWER))
 255                 retval |= NOUVEAU_DSM_HAS_MUX;
 256
 257         if (nouveau_test_dsm(dhandle, nouveau_optimus_dsm,
 258                 NOUVEAU_DSM_OPTIMUS_FN))
 259                 retval |= NOUVEAU_DSM_HAS_OPT;
 260
 261         if (retval)
 262                 nouveau_dsm_priv.dhandle = dhandle;
 263
 264         return retval;
 265 }
 266
 267 static bool nouveau_dsm_detect(void)
 268 {
 269         char acpi_method_name[255] = { 0 };
 270         struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
 271         struct pci_dev *pdev = NULL;
 272         int has_dsm = 0;
 273         int has_optimus = 0;
 274         int vga_count = 0;
 275         bool guid_valid;
 276         int retval;
 277         bool ret = false;
 278
 279         /* lookup the MXM GUID */
 280         guid_valid = mxm_wmi_supported();
 281
 282         if (guid_valid)
 283                 printk("MXM: GUID detected in BIOS\n");
 284
 285         /* now do DSM detection */
 286         while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
 287                 vga_count++;
 288
 289                 retval = nouveau_dsm_pci_probe(pdev);
 290                 if (retval & NOUVEAU_DSM_HAS_MUX)
 291                         has_dsm |= 1;
 292                 if (retval & NOUVEAU_DSM_HAS_OPT)
 293                         has_optimus = 1;
 294         }
 295
 296         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         if (has_optimus == 1) {
 306                 acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
 307                         &buffer);
 308                 printk(KERN_INFO "VGA switcheroo: detected Optimus DSM method %s handle\n",
 309                         acpi_method_name);
 310                 nouveau_dsm_priv.optimus_detected = true;
 311                 ret = true;
 312         }
 313
 314         return ret;
 315 }
 316
 317 void nouveau_register_dsm_handler(void)
 318 {
 319         bool r;
 320
 321         r = nouveau_dsm_detect();
 322         if (!r)
 323                 return;
 324
 325         vga_switcheroo_register_handler(&nouveau_dsm_handler);
 326 }
 327
 328 /* Must be called for Optimus models before the card can be turned off */
 329 void nouveau_switcheroo_optimus_dsm(void)
 330 {
 331         u32 result = 0;
 332         if (!nouveau_dsm_priv.optimus_detected)
 333                 return;
 334
 335         nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_FN,
 336                 NOUVEAU_DSM_OPTIMUS_ARGS, &result);
 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
 345 /* retrieve the ROM in 4k blocks */
 346 static int nouveau_rom_call(acpi_handle rom_handle, uint8_t *bios,
 347                             int offset, int len)
 348 {
 349         acpi_status status;
 350         union acpi_object rom_arg_elements[2], *obj;
 351         struct acpi_object_list rom_arg;
 352         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL};
 353
 354         rom_arg.count = 2;
 355         rom_arg.pointer = &rom_arg_elements[0];
 356
 357         rom_arg_elements[0].type = ACPI_TYPE_INTEGER;
 358         rom_arg_elements[0].integer.value = offset;
 359
 360         rom_arg_elements[1].type = ACPI_TYPE_INTEGER;
 361         rom_arg_elements[1].integer.value = len;
 362
 363         status = acpi_evaluate_object(rom_handle, NULL, &rom_arg, &buffer);
 364         if (ACPI_FAILURE(status)) {
 365                 printk(KERN_INFO "failed to evaluate ROM got %s\n", acpi_format_exception(status));
 366                 return -ENODEV;
 367         }
 368         obj = (union acpi_object *)buffer.pointer;
 369         memcpy(bios+offset, obj->buffer.pointer, len);
 370         kfree(buffer.pointer);
 371         return len;
 372 }
 373
 374 bool nouveau_acpi_rom_supported(struct pci_dev *pdev)
 375 {
 376         acpi_status status;
 377         acpi_handle dhandle, rom_handle;
 378
 379         if (!nouveau_dsm_priv.dsm_detected && !nouveau_dsm_priv.optimus_detected)
 380                 return false;
 381
 382         dhandle = DEVICE_ACPI_HANDLE(&pdev->dev);
 383         if (!dhandle)
 384                 return false;
 385
 386         status = acpi_get_handle(dhandle, "_ROM", &rom_handle);
 387         if (ACPI_FAILURE(status))
 388                 return false;
 389
 390         nouveau_dsm_priv.rom_handle = rom_handle;
 391         return true;
 392 }
 393
 394 int nouveau_acpi_get_bios_chunk(uint8_t *bios, int offset, int len)
 395 {
 396         return nouveau_rom_call(nouveau_dsm_priv.rom_handle, bios, offset, len);
 397 }
 398
 399 int
 400 nouveau_acpi_edid(struct drm_device *dev, struct drm_connector *connector)
 401 {
 402         struct nouveau_connector *nv_connector = nouveau_connector(connector);
 403         struct acpi_device *acpidev;
 404         acpi_handle handle;
 405         int type, ret;
 406         void *edid;
 407
 408         switch (connector->connector_type) {
 409         case DRM_MODE_CONNECTOR_LVDS:
 410         case DRM_MODE_CONNECTOR_eDP:
 411                 type = ACPI_VIDEO_DISPLAY_LCD;
 412                 break;
 413         default:
 414                 return -EINVAL;
 415         }
 416
 417         handle = DEVICE_ACPI_HANDLE(&dev->pdev->dev);
 418         if (!handle)
 419                 return -ENODEV;
 420
 421         ret = acpi_bus_get_device(handle, &acpidev);
 422         if (ret)
 423                 return -ENODEV;
 424
 425         ret = acpi_video_get_edid(acpidev, type, -1, &edid);
 426         if (ret < 0)
 427                 return ret;
 428
 429         nv_connector->edid = kmemdup(edid, EDID_LENGTH, GFP_KERNEL);
 430         return 0;
 431 }