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 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 err;
  60
  61         input.count = 4;
  62         input.pointer = params;
  63         params[0].type = ACPI_TYPE_BUFFER;
  64         params[0].buffer.length = sizeof(nouveau_op_dsm_muid);
  65         params[0].buffer.pointer = (char *)nouveau_op_dsm_muid;
  66         params[1].type = ACPI_TYPE_INTEGER;
  67         params[1].integer.value = 0x00000100;
  68         params[2].type = ACPI_TYPE_INTEGER;
  69         params[2].integer.value = func;
  70         params[3].type = ACPI_TYPE_BUFFER;
  71         params[3].buffer.length = 0;
  72
  73         err = acpi_evaluate_object(handle, "_DSM", &input, &output);
  74         if (err) {
  75                 printk(KERN_INFO "failed to evaluate _DSM: %d\n", err);
  76                 return err;
  77         }
  78
  79         obj = (union acpi_object *)output.pointer;
  80
  81         if (obj->type == ACPI_TYPE_INTEGER)
  82                 if (obj->integer.value == 0x80000002) {
  83                         return -ENODEV;
  84                 }
  85
  86         if (obj->type == ACPI_TYPE_BUFFER) {
  87                 if (obj->buffer.length == 4 && result) {
  88                         *result = 0;
  89                         *result |= obj->buffer.pointer[0];
  90                         *result |= (obj->buffer.pointer[1] << 8);
  91                         *result |= (obj->buffer.pointer[2] << 16);
  92                         *result |= (obj->buffer.pointer[3] << 24);
  93                 }
  94         }
  95
  96         kfree(output.pointer);
  97         return 0;
  98 }
  99
 100 static int nouveau_dsm(acpi_handle handle, int func, int arg, uint32_t *result)
 101 {
 102         struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
 103         struct acpi_object_list input;
 104         union acpi_object params[4];
 105         union acpi_object *obj;
 106         int err;
 107
 108         input.count = 4;
 109         input.pointer = params;
 110         params[0].type = ACPI_TYPE_BUFFER;
 111         params[0].buffer.length = sizeof(nouveau_dsm_muid);
 112         params[0].buffer.pointer = (char *)nouveau_dsm_muid;
 113         params[1].type = ACPI_TYPE_INTEGER;
 114         params[1].integer.value = 0x00000102;
 115         params[2].type = ACPI_TYPE_INTEGER;
 116         params[2].integer.value = func;
 117         params[3].type = ACPI_TYPE_INTEGER;
 118         params[3].integer.value = arg;
 119
 120         err = acpi_evaluate_object(handle, "_DSM", &input, &output);
 121         if (err) {
 122                 printk(KERN_INFO "failed to evaluate _DSM: %d\n", err);
 123                 return err;
 124         }
 125
 126         obj = (union acpi_object *)output.pointer;
 127
 128         if (obj->type == ACPI_TYPE_INTEGER)
 129                 if (obj->integer.value == 0x80000002)
 130                         return -ENODEV;
 131
 132         if (obj->type == ACPI_TYPE_BUFFER) {
 133                 if (obj->buffer.length == 4 && result) {
 134                         *result = 0;
 135                         *result |= obj->buffer.pointer[0];
 136                         *result |= (obj->buffer.pointer[1] << 8);
 137                         *result |= (obj->buffer.pointer[2] << 16);
 138                         *result |= (obj->buffer.pointer[3] << 24);
 139                 }
 140         }
 141
 142         kfree(output.pointer);
 143         return 0;
 144 }
 145
 146 /* Returns 1 if a DSM function is usable and 0 otherwise */
 147 static int nouveau_test_dsm(acpi_handle test_handle,
 148         int (*dsm_func)(acpi_handle, int, int, uint32_t *),
 149         int sfnc)
 150 {
 151         u32 result = 0;
 152
 153         /* Function 0 returns a Buffer containing available functions. The args
 154          * parameter is ignored for function 0, so just put 0 in it */
 155         if (dsm_func(test_handle, 0, 0, &result))
 156                 return 0;
 157
 158         /* ACPI Spec v4 9.14.1: if bit 0 is zero, no function is supported. If
 159          * the n-th bit is enabled, function n is supported */
 160         return result & 1 && result & (1 << sfnc);
 161 }
 162
 163 static int nouveau_dsm_switch_mux(acpi_handle handle, int mux_id)
 164 {
 165         mxm_wmi_call_mxmx(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
 166         mxm_wmi_call_mxds(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
 167         return nouveau_dsm(handle, NOUVEAU_DSM_LED, mux_id, NULL);
 168 }
 169
 170 static int nouveau_dsm_set_discrete_state(acpi_handle handle, enum vga_switcheroo_state state)
 171 {
 172         int arg;
 173         if (state == VGA_SWITCHEROO_ON)
 174                 arg = NOUVEAU_DSM_POWER_SPEED;
 175         else
 176                 arg = NOUVEAU_DSM_POWER_STAMINA;
 177         nouveau_dsm(handle, NOUVEAU_DSM_POWER, arg, NULL);
 178         return 0;
 179 }
 180
 181 static int nouveau_dsm_switchto(enum vga_switcheroo_client_id id)
 182 {
 183         if (id == VGA_SWITCHEROO_IGD)
 184                 return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_STAMINA);
 185         else
 186                 return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_SPEED);
 187 }
 188
 189 static int nouveau_dsm_power_state(enum vga_switcheroo_client_id id,
 190                                    enum vga_switcheroo_state state)
 191 {
 192         if (id == VGA_SWITCHEROO_IGD)
 193                 return 0;
 194
 195         return nouveau_dsm_set_discrete_state(nouveau_dsm_priv.dhandle, state);
 196 }
 197
 198 static int nouveau_dsm_init(void)
 199 {
 200         return 0;
 201 }
 202
 203 static int nouveau_dsm_get_client_id(struct pci_dev *pdev)
 204 {
 205         /* easy option one - intel vendor ID means Integrated */
 206         if (pdev->vendor == PCI_VENDOR_ID_INTEL)
 207                 return VGA_SWITCHEROO_IGD;
 208
 209         /* is this device on Bus 0? - this may need improving */
 210         if (pdev->bus->number == 0)
 211                 return VGA_SWITCHEROO_IGD;
 212
 213         return VGA_SWITCHEROO_DIS;
 214 }
 215
 216 static struct vga_switcheroo_handler nouveau_dsm_handler = {
 217         .switchto = nouveau_dsm_switchto,
 218         .power_state = nouveau_dsm_power_state,
 219         .init = nouveau_dsm_init,
 220         .get_client_id = nouveau_dsm_get_client_id,
 221 };
 222
 223 static int nouveau_dsm_pci_probe(struct pci_dev *pdev)
 224 {
 225         acpi_handle dhandle, nvidia_handle;
 226         acpi_status status;
 227         int retval = 0;
 228
 229         dhandle = DEVICE_ACPI_HANDLE(&pdev->dev);
 230         if (!dhandle)
 231                 return false;
 232
 233         status = acpi_get_handle(dhandle, "_DSM", &nvidia_handle);
 234         if (ACPI_FAILURE(status)) {
 235                 return false;
 236         }
 237
 238         if (nouveau_test_dsm(dhandle, nouveau_dsm, NOUVEAU_DSM_POWER))
 239                 retval |= NOUVEAU_DSM_HAS_MUX;
 240
 241         if (nouveau_test_dsm(dhandle, nouveau_optimus_dsm,
 242                 NOUVEAU_DSM_OPTIMUS_FN))
 243                 retval |= NOUVEAU_DSM_HAS_OPT;
 244
 245         if (retval)
 246                 nouveau_dsm_priv.dhandle = dhandle;
 247
 248         return retval;
 249 }
 250
 251 static bool nouveau_dsm_detect(void)
 252 {
 253         char acpi_method_name[255] = { 0 };
 254         struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
 255         struct pci_dev *pdev = NULL;
 256         int has_dsm = 0;
 257         int has_optimus;
 258         int vga_count = 0;
 259         bool guid_valid;
 260         int retval;
 261         bool ret = false;
 262
 263         /* lookup the MXM GUID */
 264         guid_valid = mxm_wmi_supported();
 265
 266         if (guid_valid)
 267                 printk("MXM: GUID detected in BIOS\n");
 268
 269         /* now do DSM detection */
 270         while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
 271                 vga_count++;
 272
 273                 retval = nouveau_dsm_pci_probe(pdev);
 274                 if (retval & NOUVEAU_DSM_HAS_MUX)
 275                         has_dsm |= 1;
 276                 if (retval & NOUVEAU_DSM_HAS_OPT)
 277                         has_optimus = 1;
 278         }
 279
 280         if (vga_count == 2 && has_dsm && guid_valid) {
 281                 acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME, &buffer);
 282                 printk(KERN_INFO "VGA switcheroo: detected DSM switching method %s handle\n",
 283                        acpi_method_name);
 284                 nouveau_dsm_priv.dsm_detected = true;
 285                 ret = true;
 286         }
 287
 288         if (has_optimus == 1)
 289                 nouveau_dsm_priv.optimus_detected = true;
 290
 291         return ret;
 292 }
 293
 294 void nouveau_register_dsm_handler(void)
 295 {
 296         bool r;
 297
 298         r = nouveau_dsm_detect();
 299         if (!r)
 300                 return;
 301
 302         vga_switcheroo_register_handler(&nouveau_dsm_handler);
 303 }
 304
 305 void nouveau_unregister_dsm_handler(void)
 306 {
 307         vga_switcheroo_unregister_handler();
 308 }
 309
 310 /* retrieve the ROM in 4k blocks */
 311 static int nouveau_rom_call(acpi_handle rom_handle, uint8_t *bios,
 312                             int offset, int len)
 313 {
 314         acpi_status status;
 315         union acpi_object rom_arg_elements[2], *obj;
 316         struct acpi_object_list rom_arg;
 317         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL};
 318
 319         rom_arg.count = 2;
 320         rom_arg.pointer = &rom_arg_elements[0];
 321
 322         rom_arg_elements[0].type = ACPI_TYPE_INTEGER;
 323         rom_arg_elements[0].integer.value = offset;
 324
 325         rom_arg_elements[1].type = ACPI_TYPE_INTEGER;
 326         rom_arg_elements[1].integer.value = len;
 327
 328         status = acpi_evaluate_object(rom_handle, NULL, &rom_arg, &buffer);
 329         if (ACPI_FAILURE(status)) {
 330                 printk(KERN_INFO "failed to evaluate ROM got %s\n", acpi_format_exception(status));
 331                 return -ENODEV;
 332         }
 333         obj = (union acpi_object *)buffer.pointer;
 334         memcpy(bios+offset, obj->buffer.pointer, len);
 335         kfree(buffer.pointer);
 336         return len;
 337 }
 338
 339 bool nouveau_acpi_rom_supported(struct pci_dev *pdev)
 340 {
 341         acpi_status status;
 342         acpi_handle dhandle, rom_handle;
 343
 344         if (!nouveau_dsm_priv.dsm_detected && !nouveau_dsm_priv.optimus_detected)
 345                 return false;
 346
 347         dhandle = DEVICE_ACPI_HANDLE(&pdev->dev);
 348         if (!dhandle)
 349                 return false;
 350
 351         status = acpi_get_handle(dhandle, "_ROM", &rom_handle);
 352         if (ACPI_FAILURE(status))
 353                 return false;
 354
 355         nouveau_dsm_priv.rom_handle = rom_handle;
 356         return true;
 357 }
 358
 359 int nouveau_acpi_get_bios_chunk(uint8_t *bios, int offset, int len)
 360 {
 361         return nouveau_rom_call(nouveau_dsm_priv.rom_handle, bios, offset, len);
 362 }
 363
 364 int
 365 nouveau_acpi_edid(struct drm_device *dev, struct drm_connector *connector)
 366 {
 367         struct nouveau_connector *nv_connector = nouveau_connector(connector);
 368         struct acpi_device *acpidev;
 369         acpi_handle handle;
 370         int type, ret;
 371         void *edid;
 372
 373         switch (connector->connector_type) {
 374         case DRM_MODE_CONNECTOR_LVDS:
 375         case DRM_MODE_CONNECTOR_eDP:
 376                 type = ACPI_VIDEO_DISPLAY_LCD;
 377                 break;
 378         default:
 379                 return -EINVAL;
 380         }
 381
 382         handle = DEVICE_ACPI_HANDLE(&dev->pdev->dev);
 383         if (!handle)
 384                 return -ENODEV;
 385
 386         ret = acpi_bus_get_device(handle, &acpidev);
 387         if (ret)
 388                 return -ENODEV;
 389
 390         ret = acpi_video_get_edid(acpidev, type, -1, &edid);
 391         if (ret < 0)
 392                 return ret;
 393
 394         nv_connector->edid = kmemdup(edid, EDID_LENGTH, GFP_KERNEL);
 395         return 0;
 396 }