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 <drm/drmP.h>
  11 #include <drm/drm_crtc_helper.h>
  12 #include "nouveau_drv.h"
  13 #include <drm/nouveau_drm.h>
  14 #include "nv50_display.h"
  15 #include "nouveau_connector.h"
  16
  17 #include <linux/vga_switcheroo.h>
  18
  19 #define NOUVEAU_DSM_LED 0x02
  20 #define NOUVEAU_DSM_LED_STATE 0x00
  21 #define NOUVEAU_DSM_LED_OFF 0x10
  22 #define NOUVEAU_DSM_LED_STAMINA 0x11
  23 #define NOUVEAU_DSM_LED_SPEED 0x12
  24
  25 #define NOUVEAU_DSM_POWER 0x03
  26 #define NOUVEAU_DSM_POWER_STATE 0x00
  27 #define NOUVEAU_DSM_POWER_SPEED 0x01
  28 #define NOUVEAU_DSM_POWER_STAMINA 0x02
  29
  30 #define NOUVEAU_DSM_OPTIMUS_FN 0x1A
  31 #define NOUVEAU_DSM_OPTIMUS_ARGS 0x03000001
  32
  33 static struct nouveau_dsm_priv {
  34         bool dsm_detected;
  35         bool optimus_detected;
  36         acpi_handle dhandle;
  37         acpi_handle rom_handle;
  38 } nouveau_dsm_priv;
  39
  40 #define NOUVEAU_DSM_HAS_MUX 0x1
  41 #define NOUVEAU_DSM_HAS_OPT 0x2
  42
  43 static const char nouveau_dsm_muid[] = {
  44         0xA0, 0xA0, 0x95, 0x9D, 0x60, 0x00, 0x48, 0x4D,
  45         0xB3, 0x4D, 0x7E, 0x5F, 0xEA, 0x12, 0x9F, 0xD4,
  46 };
  47
  48 static const char nouveau_op_dsm_muid[] = {
  49         0xF8, 0xD8, 0x86, 0xA4, 0xDA, 0x0B, 0x1B, 0x47,
  50         0xA7, 0x2B, 0x60, 0x42, 0xA6, 0xB5, 0xBE, 0xE0,
  51 };
  52
  53 static int nouveau_optimus_dsm(acpi_handle handle, int func, int arg, uint32_t *result)
  54 {
  55         struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
  56         struct acpi_object_list input;
  57         union acpi_object params[4];
  58         union acpi_object *obj;
  59         int i, err;
  60         char args_buff[4];
  61
  62         input.count = 4;
  63         input.pointer = params;
  64         params[0].type = ACPI_TYPE_BUFFER;
  65         params[0].buffer.length = sizeof(nouveau_op_dsm_muid);
  66         params[0].buffer.pointer = (char *)nouveau_op_dsm_muid;
  67         params[1].type = ACPI_TYPE_INTEGER;
  68         params[1].integer.value = 0x00000100;
  69         params[2].type = ACPI_TYPE_INTEGER;
  70         params[2].integer.value = func;
  71         params[3].type = ACPI_TYPE_BUFFER;
  72         params[3].buffer.length = 4;
  73         /* ACPI is little endian, AABBCCDD becomes {DD,CC,BB,AA} */
  74         for (i = 0; i < 4; i++)
  75                 args_buff[i] = (arg >> i * 8) & 0xFF;
  76         params[3].buffer.pointer = args_buff;
  77
  78         err = acpi_evaluate_object(handle, "_DSM", &input, &output);
  79         if (err) {
  80                 printk(KERN_INFO "failed to evaluate _DSM: %d\n", err);
  81                 return err;
  82         }
  83
  84         obj = (union acpi_object *)output.pointer;
  85
  86         if (obj->type == ACPI_TYPE_INTEGER)
  87                 if (obj->integer.value == 0x80000002) {
  88                         return -ENODEV;
  89                 }
  90
  91         if (obj->type == ACPI_TYPE_BUFFER) {
  92                 if (obj->buffer.length == 4 && result) {
  93                         *result = 0;
  94                         *result |= obj->buffer.pointer[0];
  95                         *result |= (obj->buffer.pointer[1] << 8);
  96                         *result |= (obj->buffer.pointer[2] << 16);
  97                         *result |= (obj->buffer.pointer[3] << 24);
  98                 }
  99         }
 100
 101         kfree(output.pointer);
 102         return 0;
 103 }
 104
 105 static int nouveau_dsm(acpi_handle handle, int func, int arg, uint32_t *result)
 106 {
 107         struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
 108         struct acpi_object_list input;
 109         union acpi_object params[4];
 110         union acpi_object *obj;
 111         int err;
 112
 113         input.count = 4;
 114         input.pointer = params;
 115         params[0].type = ACPI_TYPE_BUFFER;
 116         params[0].buffer.length = sizeof(nouveau_dsm_muid);
 117         params[0].buffer.pointer = (char *)nouveau_dsm_muid;
 118         params[1].type = ACPI_TYPE_INTEGER;
 119         params[1].integer.value = 0x00000102;
 120         params[2].type = ACPI_TYPE_INTEGER;
 121         params[2].integer.value = func;
 122         params[3].type = ACPI_TYPE_INTEGER;
 123         params[3].integer.value = arg;
 124
 125         err = acpi_evaluate_object(handle, "_DSM", &input, &output);
 126         if (err) {
 127                 printk(KERN_INFO "failed to evaluate _DSM: %d\n", err);
 128                 return err;
 129         }
 130
 131         obj = (union acpi_object *)output.pointer;
 132
 133         if (obj->type == ACPI_TYPE_INTEGER)
 134                 if (obj->integer.value == 0x80000002)
 135                         return -ENODEV;
 136
 137         if (obj->type == ACPI_TYPE_BUFFER) {
 138                 if (obj->buffer.length == 4 && result) {
 139                         *result = 0;
 140                         *result |= obj->buffer.pointer[0];
 141                         *result |= (obj->buffer.pointer[1] << 8);
 142                         *result |= (obj->buffer.pointer[2] << 16);
 143                         *result |= (obj->buffer.pointer[3] << 24);
 144                 }
 145         }
 146
 147         kfree(output.pointer);
 148         return 0;
 149 }
 150
 151 /* Returns 1 if a DSM function is usable and 0 otherwise */
 152 static int nouveau_test_dsm(acpi_handle test_handle,
 153         int (*dsm_func)(acpi_handle, int, int, uint32_t *),
 154         int sfnc)
 155 {
 156         u32 result = 0;
 157
 158         /* Function 0 returns a Buffer containing available functions. The args
 159          * parameter is ignored for function 0, so just put 0 in it */
 160         if (dsm_func(test_handle, 0, 0, &result))
 161                 return 0;
 162
 163         /* ACPI Spec v4 9.14.1: if bit 0 is zero, no function is supported. If
 164          * the n-th bit is enabled, function n is supported */
 165         return result & 1 && result & (1 << sfnc);
 166 }
 167
 168 static int nouveau_dsm_switch_mux(acpi_handle handle, int mux_id)
 169 {
 170         mxm_wmi_call_mxmx(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
 171         mxm_wmi_call_mxds(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
 172         return nouveau_dsm(handle, NOUVEAU_DSM_LED, mux_id, NULL);
 173 }
 174
 175 static int nouveau_dsm_set_discrete_state(acpi_handle handle, enum vga_switcheroo_state state)
 176 {
 177         int arg;
 178         if (state == VGA_SWITCHEROO_ON)
 179                 arg = NOUVEAU_DSM_POWER_SPEED;
 180         else
 181                 arg = NOUVEAU_DSM_POWER_STAMINA;
 182         nouveau_dsm(handle, NOUVEAU_DSM_POWER, arg, NULL);
 183         return 0;
 184 }
 185
 186 static int nouveau_dsm_switchto(enum vga_switcheroo_client_id id)
 187 {
 188         /* perhaps the _DSM functions are mutually exclusive, but prepare for
 189          * the future */
 190         if (!nouveau_dsm_priv.dsm_detected && nouveau_dsm_priv.optimus_detected)
 191                 return 0;
 192         if (id == VGA_SWITCHEROO_IGD)
 193                 return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_STAMINA);
 194         else
 195                 return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_SPEED);
 196 }
 197
 198 static int nouveau_dsm_power_state(enum vga_switcheroo_client_id id,
 199                                    enum vga_switcheroo_state state)
 200 {
 201         if (id == VGA_SWITCHEROO_IGD)
 202                 return 0;
 203
 204         /* Optimus laptops have the card already disabled in
 205          * nouveau_switcheroo_set_state */
 206         if (!nouveau_dsm_priv.dsm_detected && nouveau_dsm_priv.optimus_detected)
 207                 return 0;
 208
 209         return nouveau_dsm_set_discrete_state(nouveau_dsm_priv.dhandle, state);
 210 }
 211
 212 static int nouveau_dsm_get_client_id(struct pci_dev *pdev)
 213 {
 214         /* easy option one - intel vendor ID means Integrated */
 215         if (pdev->vendor == PCI_VENDOR_ID_INTEL)
 216                 return VGA_SWITCHEROO_IGD;
 217
 218         /* is this device on Bus 0? - this may need improving */
 219         if (pdev->bus->number == 0)
 220                 return VGA_SWITCHEROO_IGD;
 221
 222         return VGA_SWITCHEROO_DIS;
 223 }
 224
 225 static struct vga_switcheroo_handler nouveau_dsm_handler = {
 226         .switchto = nouveau_dsm_switchto,
 227         .power_state = nouveau_dsm_power_state,
 228         .get_client_id = nouveau_dsm_get_client_id,
 229 };
 230
 231 static int nouveau_dsm_pci_probe(struct pci_dev *pdev)
 232 {
 233         acpi_handle dhandle, nvidia_handle;
 234         acpi_status status;
 235         int retval = 0;
 236
 237         dhandle = DEVICE_ACPI_HANDLE(&pdev->dev);
 238         if (!dhandle)
 239                 return false;
 240
 241         status = acpi_get_handle(dhandle, "_DSM", &nvidia_handle);
 242         if (ACPI_FAILURE(status)) {
 243                 return false;
 244         }
 245
 246         if (nouveau_test_dsm(dhandle, nouveau_dsm, NOUVEAU_DSM_POWER))
 247                 retval |= NOUVEAU_DSM_HAS_MUX;
 248
 249         if (nouveau_test_dsm(dhandle, nouveau_optimus_dsm,
 250                 NOUVEAU_DSM_OPTIMUS_FN))
 251                 retval |= NOUVEAU_DSM_HAS_OPT;
 252
 253         if (retval)
 254                 nouveau_dsm_priv.dhandle = dhandle;
 255
 256         return retval;
 257 }
 258
 259 static bool nouveau_dsm_detect(void)
 260 {
 261         char acpi_method_name[255] = { 0 };
 262         struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
 263         struct pci_dev *pdev = NULL;
 264         int has_dsm = 0;
 265         int has_optimus = 0;
 266         int vga_count = 0;
 267         bool guid_valid;
 268         int retval;
 269         bool ret = false;
 270
 271         /* lookup the MXM GUID */
 272         guid_valid = mxm_wmi_supported();
 273
 274         if (guid_valid)
 275                 printk("MXM: GUID detected in BIOS\n");
 276
 277         /* now do DSM detection */
 278         while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 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         if (vga_count == 2 && has_dsm && guid_valid) {
 289                 acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
 290                         &buffer);
 291                 printk(KERN_INFO "VGA switcheroo: detected DSM switching method %s handle\n",
 292                         acpi_method_name);
 293                 nouveau_dsm_priv.dsm_detected = true;
 294                 ret = true;
 295         }
 296
 297         if (has_optimus == 1) {
 298                 acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
 299                         &buffer);
 300                 printk(KERN_INFO "VGA switcheroo: detected Optimus DSM method %s handle\n",
 301                         acpi_method_name);
 302                 nouveau_dsm_priv.optimus_detected = true;
 303                 ret = true;
 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_FN,
 328                 NOUVEAU_DSM_OPTIMUS_ARGS, &result);
 329 }
 330
 331 void nouveau_unregister_dsm_handler(void)
 332 {
 333         if (nouveau_dsm_priv.optimus_detected || nouveau_dsm_priv.dsm_detected)
 334                 vga_switcheroo_unregister_handler();
 335 }
 336
 337 /* retrieve the ROM in 4k blocks */
 338 static int nouveau_rom_call(acpi_handle rom_handle, uint8_t *bios,
 339                             int offset, int len)
 340 {
 341         acpi_status status;
 342         union acpi_object rom_arg_elements[2], *obj;
 343         struct acpi_object_list rom_arg;
 344         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL};
 345
 346         rom_arg.count = 2;
 347         rom_arg.pointer = &rom_arg_elements[0];
 348
 349         rom_arg_elements[0].type = ACPI_TYPE_INTEGER;
 350         rom_arg_elements[0].integer.value = offset;
 351
 352         rom_arg_elements[1].type = ACPI_TYPE_INTEGER;
 353         rom_arg_elements[1].integer.value = len;
 354
 355         status = acpi_evaluate_object(rom_handle, NULL, &rom_arg, &buffer);
 356         if (ACPI_FAILURE(status)) {
 357                 printk(KERN_INFO "failed to evaluate ROM got %s\n", acpi_format_exception(status));
 358                 return -ENODEV;
 359         }
 360         obj = (union acpi_object *)buffer.pointer;
 361         memcpy(bios+offset, obj->buffer.pointer, len);
 362         kfree(buffer.pointer);
 363         return len;
 364 }
 365
 366 bool nouveau_acpi_rom_supported(struct pci_dev *pdev)
 367 {
 368         acpi_status status;
 369         acpi_handle dhandle, rom_handle;
 370
 371         if (!nouveau_dsm_priv.dsm_detected && !nouveau_dsm_priv.optimus_detected)
 372                 return false;
 373
 374         dhandle = DEVICE_ACPI_HANDLE(&pdev->dev);
 375         if (!dhandle)
 376                 return false;
 377
 378         status = acpi_get_handle(dhandle, "_ROM", &rom_handle);
 379         if (ACPI_FAILURE(status))
 380                 return false;
 381
 382         nouveau_dsm_priv.rom_handle = rom_handle;
 383         return true;
 384 }
 385
 386 int nouveau_acpi_get_bios_chunk(uint8_t *bios, int offset, int len)
 387 {
 388         return nouveau_rom_call(nouveau_dsm_priv.rom_handle, bios, offset, len);
 389 }
 390
 391 int
 392 nouveau_acpi_edid(struct drm_device *dev, struct drm_connector *connector)
 393 {
 394         struct nouveau_connector *nv_connector = nouveau_connector(connector);
 395         struct acpi_device *acpidev;
 396         acpi_handle handle;
 397         int type, ret;
 398         void *edid;
 399
 400         switch (connector->connector_type) {
 401         case DRM_MODE_CONNECTOR_LVDS:
 402         case DRM_MODE_CONNECTOR_eDP:
 403                 type = ACPI_VIDEO_DISPLAY_LCD;
 404                 break;
 405         default:
 406                 return -EINVAL;
 407         }
 408
 409         handle = DEVICE_ACPI_HANDLE(&dev->pdev->dev);
 410         if (!handle)
 411                 return -ENODEV;
 412
 413         ret = acpi_bus_get_device(handle, &acpidev);
 414         if (ret)
 415                 return -ENODEV;
 416
 417         ret = acpi_video_get_edid(acpidev, type, -1, &edid);
 418         if (ret < 0)
 419                 return ret;
 420
 421         nv_connector->edid = kmemdup(edid, EDID_LENGTH, GFP_KERNEL);
 422         return 0;
 423 }