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_SUPPORTED 0x00
  22 #define NOUVEAU_DSM_SUPPORTED_FUNCTIONS 0x00
  23
  24 #define NOUVEAU_DSM_ACTIVE 0x01
  25 #define NOUVEAU_DSM_ACTIVE_QUERY 0x00
  26
  27 #define NOUVEAU_DSM_LED 0x02
  28 #define NOUVEAU_DSM_LED_STATE 0x00
  29 #define NOUVEAU_DSM_LED_OFF 0x10
  30 #define NOUVEAU_DSM_LED_STAMINA 0x11
  31 #define NOUVEAU_DSM_LED_SPEED 0x12
  32
  33 #define NOUVEAU_DSM_POWER 0x03
  34 #define NOUVEAU_DSM_POWER_STATE 0x00
  35 #define NOUVEAU_DSM_POWER_SPEED 0x01
  36 #define NOUVEAU_DSM_POWER_STAMINA 0x02
  37
  38 static struct nouveau_dsm_priv {
  39         bool dsm_detected;
  40         bool optimus_detected;
  41         acpi_handle dhandle;
  42         acpi_handle rom_handle;
  43 } nouveau_dsm_priv;
  44
  45 #define NOUVEAU_DSM_HAS_MUX 0x1
  46 #define NOUVEAU_DSM_HAS_OPT 0x2
  47
  48 static const char nouveau_dsm_muid[] = {
  49         0xA0, 0xA0, 0x95, 0x9D, 0x60, 0x00, 0x48, 0x4D,
  50         0xB3, 0x4D, 0x7E, 0x5F, 0xEA, 0x12, 0x9F, 0xD4,
  51 };
  52
  53 static const char nouveau_op_dsm_muid[] = {
  54         0xF8, 0xD8, 0x86, 0xA4, 0xDA, 0x0B, 0x1B, 0x47,
  55         0xA7, 0x2B, 0x60, 0x42, 0xA6, 0xB5, 0xBE, 0xE0,
  56 };
  57
  58 static int nouveau_optimus_dsm(acpi_handle handle, int func, int arg, uint32_t *result)
  59 {
  60         struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
  61         struct acpi_object_list input;
  62         union acpi_object params[4];
  63         union acpi_object *obj;
  64         int err;
  65
  66         input.count = 4;
  67         input.pointer = params;
  68         params[0].type = ACPI_TYPE_BUFFER;
  69         params[0].buffer.length = sizeof(nouveau_op_dsm_muid);
  70         params[0].buffer.pointer = (char *)nouveau_op_dsm_muid;
  71         params[1].type = ACPI_TYPE_INTEGER;
  72         params[1].integer.value = 0x00000100;
  73         params[2].type = ACPI_TYPE_INTEGER;
  74         params[2].integer.value = func;
  75         params[3].type = ACPI_TYPE_BUFFER;
  76         params[3].buffer.length = 0;
  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 static int nouveau_dsm_switch_mux(acpi_handle handle, int mux_id)
 152 {
 153         mxm_wmi_call_mxmx(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
 154         mxm_wmi_call_mxds(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
 155         return nouveau_dsm(handle, NOUVEAU_DSM_LED, mux_id, NULL);
 156 }
 157
 158 static int nouveau_dsm_set_discrete_state(acpi_handle handle, enum vga_switcheroo_state state)
 159 {
 160         int arg;
 161         if (state == VGA_SWITCHEROO_ON)
 162                 arg = NOUVEAU_DSM_POWER_SPEED;
 163         else
 164                 arg = NOUVEAU_DSM_POWER_STAMINA;
 165         nouveau_dsm(handle, NOUVEAU_DSM_POWER, arg, NULL);
 166         return 0;
 167 }
 168
 169 static int nouveau_dsm_switchto(enum vga_switcheroo_client_id id)
 170 {
 171         if (id == VGA_SWITCHEROO_IGD)
 172                 return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_STAMINA);
 173         else
 174                 return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_SPEED);
 175 }
 176
 177 static int nouveau_dsm_power_state(enum vga_switcheroo_client_id id,
 178                                    enum vga_switcheroo_state state)
 179 {
 180         if (id == VGA_SWITCHEROO_IGD)
 181                 return 0;
 182
 183         return nouveau_dsm_set_discrete_state(nouveau_dsm_priv.dhandle, state);
 184 }
 185
 186 static int nouveau_dsm_init(void)
 187 {
 188         return 0;
 189 }
 190
 191 static int nouveau_dsm_get_client_id(struct pci_dev *pdev)
 192 {
 193         /* easy option one - intel vendor ID means Integrated */
 194         if (pdev->vendor == PCI_VENDOR_ID_INTEL)
 195                 return VGA_SWITCHEROO_IGD;
 196
 197         /* is this device on Bus 0? - this may need improving */
 198         if (pdev->bus->number == 0)
 199                 return VGA_SWITCHEROO_IGD;
 200
 201         return VGA_SWITCHEROO_DIS;
 202 }
 203
 204 static struct vga_switcheroo_handler nouveau_dsm_handler = {
 205         .switchto = nouveau_dsm_switchto,
 206         .power_state = nouveau_dsm_power_state,
 207         .init = nouveau_dsm_init,
 208         .get_client_id = nouveau_dsm_get_client_id,
 209 };
 210
 211 static int nouveau_dsm_pci_probe(struct pci_dev *pdev)
 212 {
 213         acpi_handle dhandle, nvidia_handle;
 214         acpi_status status;
 215         int ret, retval = 0;
 216         uint32_t result;
 217
 218         dhandle = DEVICE_ACPI_HANDLE(&pdev->dev);
 219         if (!dhandle)
 220                 return false;
 221
 222         status = acpi_get_handle(dhandle, "_DSM", &nvidia_handle);
 223         if (ACPI_FAILURE(status)) {
 224                 return false;
 225         }
 226
 227         ret = nouveau_dsm(dhandle, NOUVEAU_DSM_SUPPORTED,
 228                           NOUVEAU_DSM_SUPPORTED_FUNCTIONS, &result);
 229         if (ret == 0)
 230                 retval |= NOUVEAU_DSM_HAS_MUX;
 231
 232         ret = nouveau_optimus_dsm(dhandle, 0, 0, &result);
 233         if (ret == 0)
 234                 retval |= NOUVEAU_DSM_HAS_OPT;
 235
 236         if (retval)
 237                 nouveau_dsm_priv.dhandle = dhandle;
 238
 239         return retval;
 240 }
 241
 242 static bool nouveau_dsm_detect(void)
 243 {
 244         char acpi_method_name[255] = { 0 };
 245         struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
 246         struct pci_dev *pdev = NULL;
 247         int has_dsm = 0;
 248         int has_optimus;
 249         int vga_count = 0;
 250         bool guid_valid;
 251         int retval;
 252         bool ret = false;
 253
 254         /* lookup the MXM GUID */
 255         guid_valid = mxm_wmi_supported();
 256
 257         if (guid_valid)
 258                 printk("MXM: GUID detected in BIOS\n");
 259
 260         /* now do DSM detection */
 261         while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
 262                 vga_count++;
 263
 264                 retval = nouveau_dsm_pci_probe(pdev);
 265                 if (retval & NOUVEAU_DSM_HAS_MUX)
 266                         has_dsm |= 1;
 267                 if (retval & NOUVEAU_DSM_HAS_OPT)
 268                         has_optimus = 1;
 269         }
 270
 271         if (vga_count == 2 && has_dsm && guid_valid) {
 272                 acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME, &buffer);
 273                 printk(KERN_INFO "VGA switcheroo: detected DSM switching method %s handle\n",
 274                        acpi_method_name);
 275                 nouveau_dsm_priv.dsm_detected = true;
 276                 ret = true;
 277         }
 278
 279         if (has_optimus == 1)
 280                 nouveau_dsm_priv.optimus_detected = true;
 281
 282         return ret;
 283 }
 284
 285 void nouveau_register_dsm_handler(void)
 286 {
 287         bool r;
 288
 289         r = nouveau_dsm_detect();
 290         if (!r)
 291                 return;
 292
 293         vga_switcheroo_register_handler(&nouveau_dsm_handler);
 294 }
 295
 296 void nouveau_unregister_dsm_handler(void)
 297 {
 298         vga_switcheroo_unregister_handler();
 299 }
 300
 301 /* retrieve the ROM in 4k blocks */
 302 static int nouveau_rom_call(acpi_handle rom_handle, uint8_t *bios,
 303                             int offset, int len)
 304 {
 305         acpi_status status;
 306         union acpi_object rom_arg_elements[2], *obj;
 307         struct acpi_object_list rom_arg;
 308         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL};
 309
 310         rom_arg.count = 2;
 311         rom_arg.pointer = &rom_arg_elements[0];
 312
 313         rom_arg_elements[0].type = ACPI_TYPE_INTEGER;
 314         rom_arg_elements[0].integer.value = offset;
 315
 316         rom_arg_elements[1].type = ACPI_TYPE_INTEGER;
 317         rom_arg_elements[1].integer.value = len;
 318
 319         status = acpi_evaluate_object(rom_handle, NULL, &rom_arg, &buffer);
 320         if (ACPI_FAILURE(status)) {
 321                 printk(KERN_INFO "failed to evaluate ROM got %s\n", acpi_format_exception(status));
 322                 return -ENODEV;
 323         }
 324         obj = (union acpi_object *)buffer.pointer;
 325         memcpy(bios+offset, obj->buffer.pointer, len);
 326         kfree(buffer.pointer);
 327         return len;
 328 }
 329
 330 bool nouveau_acpi_rom_supported(struct pci_dev *pdev)
 331 {
 332         acpi_status status;
 333         acpi_handle dhandle, rom_handle;
 334
 335         if (!nouveau_dsm_priv.dsm_detected && !nouveau_dsm_priv.optimus_detected)
 336                 return false;
 337
 338         dhandle = DEVICE_ACPI_HANDLE(&pdev->dev);
 339         if (!dhandle)
 340                 return false;
 341
 342         status = acpi_get_handle(dhandle, "_ROM", &rom_handle);
 343         if (ACPI_FAILURE(status))
 344                 return false;
 345
 346         nouveau_dsm_priv.rom_handle = rom_handle;
 347         return true;
 348 }
 349
 350 int nouveau_acpi_get_bios_chunk(uint8_t *bios, int offset, int len)
 351 {
 352         return nouveau_rom_call(nouveau_dsm_priv.rom_handle, bios, offset, len);
 353 }
 354
 355 int
 356 nouveau_acpi_edid(struct drm_device *dev, struct drm_connector *connector)
 357 {
 358         struct nouveau_connector *nv_connector = nouveau_connector(connector);
 359         struct acpi_device *acpidev;
 360         acpi_handle handle;
 361         int type, ret;
 362         void *edid;
 363
 364         switch (connector->connector_type) {
 365         case DRM_MODE_CONNECTOR_LVDS:
 366         case DRM_MODE_CONNECTOR_eDP:
 367                 type = ACPI_VIDEO_DISPLAY_LCD;
 368                 break;
 369         default:
 370                 return -EINVAL;
 371         }
 372
 373         handle = DEVICE_ACPI_HANDLE(&dev->pdev->dev);
 374         if (!handle)
 375                 return -ENODEV;
 376
 377         ret = acpi_bus_get_device(handle, &acpidev);
 378         if (ret)
 379                 return -ENODEV;
 380
 381         ret = acpi_video_get_edid(acpidev, type, -1, &edid);
 382         if (ret < 0)
 383                 return ret;
 384
 385         nv_connector->edid = kmemdup(edid, EDID_LENGTH, GFP_KERNEL);
 386         return 0;
 387 }