drivers/gpu/drm/nouveau/nouveau_acpi.c

   1 // SPDX-License-Identifier: MIT
   2 #include <linux/pci.h>
   3 #include <linux/acpi.h>
   4 #include <linux/slab.h>
   5 #include <linux/mxm-wmi.h>
   6 #include <linux/vga_switcheroo.h>
   7 #include <drm/drm_edid.h>
   8 #include <acpi/video.h>
   9
  10 #include "nouveau_drv.h"
  11 #include "nouveau_acpi.h"
  12
  13 #define NOUVEAU_DSM_LED 0x02
  14 #define NOUVEAU_DSM_LED_STATE 0x00
  15 #define NOUVEAU_DSM_LED_OFF 0x10
  16 #define NOUVEAU_DSM_LED_STAMINA 0x11
  17 #define NOUVEAU_DSM_LED_SPEED 0x12
  18
  19 #define NOUVEAU_DSM_POWER 0x03
  20 #define NOUVEAU_DSM_POWER_STATE 0x00
  21 #define NOUVEAU_DSM_POWER_SPEED 0x01
  22 #define NOUVEAU_DSM_POWER_STAMINA 0x02
  23
  24 #define NOUVEAU_DSM_OPTIMUS_CAPS 0x1A
  25 #define NOUVEAU_DSM_OPTIMUS_FLAGS 0x1B
  26
  27 #define NOUVEAU_DSM_OPTIMUS_POWERDOWN_PS3 (3 << 24)
  28 #define NOUVEAU_DSM_OPTIMUS_NO_POWERDOWN_PS3 (2 << 24)
  29 #define NOUVEAU_DSM_OPTIMUS_FLAGS_CHANGED (1)
  30
  31 #define NOUVEAU_DSM_OPTIMUS_SET_POWERDOWN (NOUVEAU_DSM_OPTIMUS_POWERDOWN_PS3 | NOUVEAU_DSM_OPTIMUS_FLAGS_CHANGED)
  32
  33 /* result of the optimus caps function */
  34 #define OPTIMUS_ENABLED (1 << 0)
  35 #define OPTIMUS_STATUS_MASK (3 << 3)
  36 #define OPTIMUS_STATUS_OFF  (0 << 3)
  37 #define OPTIMUS_STATUS_ON_ENABLED  (1 << 3)
  38 #define OPTIMUS_STATUS_PWR_STABLE  (3 << 3)
  39 #define OPTIMUS_DISPLAY_HOTPLUG (1 << 6)
  40 #define OPTIMUS_CAPS_MASK (7 << 24)
  41 #define OPTIMUS_DYNAMIC_PWR_CAP (1 << 24)
  42
  43 #define OPTIMUS_AUDIO_CAPS_MASK (3 << 27)
  44 #define OPTIMUS_HDA_CODEC_MASK (2 << 27) /* hda bios control */
  45
  46 static struct nouveau_dsm_priv {
  47         bool dsm_detected;
  48         bool optimus_detected;
  49         bool optimus_flags_detected;
  50         bool optimus_skip_dsm;
  51         acpi_handle dhandle;
  52 } nouveau_dsm_priv;
  53
  54 bool nouveau_is_optimus(void) {
  55         return nouveau_dsm_priv.optimus_detected;
  56 }
  57
  58 bool nouveau_is_v1_dsm(void) {
  59         return nouveau_dsm_priv.dsm_detected;
  60 }
  61
  62 #ifdef CONFIG_VGA_SWITCHEROO
  63 static const guid_t nouveau_dsm_muid =
  64         GUID_INIT(0x9D95A0A0, 0x0060, 0x4D48,
  65                   0xB3, 0x4D, 0x7E, 0x5F, 0xEA, 0x12, 0x9F, 0xD4);
  66
  67 static const guid_t nouveau_op_dsm_muid =
  68         GUID_INIT(0xA486D8F8, 0x0BDA, 0x471B,
  69                   0xA7, 0x2B, 0x60, 0x42, 0xA6, 0xB5, 0xBE, 0xE0);
  70
  71 static int nouveau_optimus_dsm(acpi_handle handle, int func, int arg, uint32_t *result)
  72 {
  73         int i;
  74         union acpi_object *obj;
  75         char args_buff[4];
  76         union acpi_object argv4 = {
  77                 .buffer.type = ACPI_TYPE_BUFFER,
  78                 .buffer.length = 4,
  79                 .buffer.pointer = args_buff
  80         };
  81
  82         /* ACPI is little endian, AABBCCDD becomes {DD,CC,BB,AA} */
  83         for (i = 0; i < 4; i++)
  84                 args_buff[i] = (arg >> i * 8) & 0xFF;
  85
  86         *result = 0;
  87         obj = acpi_evaluate_dsm_typed(handle, &nouveau_op_dsm_muid, 0x00000100,
  88                                       func, &argv4, ACPI_TYPE_BUFFER);
  89         if (!obj) {
  90                 acpi_handle_info(handle, "failed to evaluate _DSM\n");
  91                 return AE_ERROR;
  92         } else {
  93                 if (obj->buffer.length == 4) {
  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                 ACPI_FREE(obj);
 100         }
 101
 102         return 0;
 103 }
 104
 105 /*
 106  * On some platforms, _DSM(nouveau_op_dsm_muid, func0) has special
 107  * requirements on the fourth parameter, so a private implementation
 108  * instead of using acpi_check_dsm().
 109  */
 110 static int nouveau_dsm_get_optimus_functions(acpi_handle handle)
 111 {
 112         int result;
 113
 114         /*
 115          * Function 0 returns a Buffer containing available functions.
 116          * The args parameter is ignored for function 0, so just put 0 in it
 117          */
 118         if (nouveau_optimus_dsm(handle, 0, 0, &result))
 119                 return 0;
 120
 121         /*
 122          * ACPI Spec v4 9.14.1: if bit 0 is zero, no function is supported.
 123          * If the n-th bit is enabled, function n is supported
 124          */
 125         if (result & 1 && result & (1 << NOUVEAU_DSM_OPTIMUS_CAPS))
 126                 return result;
 127         return 0;
 128 }
 129
 130 static int nouveau_dsm(acpi_handle handle, int func, int arg)
 131 {
 132         int ret = 0;
 133         union acpi_object *obj;
 134         union acpi_object argv4 = {
 135                 .integer.type = ACPI_TYPE_INTEGER,
 136                 .integer.value = arg,
 137         };
 138
 139         obj = acpi_evaluate_dsm_typed(handle, &nouveau_dsm_muid, 0x00000102,
 140                                       func, &argv4, ACPI_TYPE_INTEGER);
 141         if (!obj) {
 142                 acpi_handle_info(handle, "failed to evaluate _DSM\n");
 143                 return AE_ERROR;
 144         } else {
 145                 if (obj->integer.value == 0x80000002)
 146                         ret = -ENODEV;
 147                 ACPI_FREE(obj);
 148         }
 149
 150         return ret;
 151 }
 152
 153 static int nouveau_dsm_switch_mux(acpi_handle handle, int mux_id)
 154 {
 155         mxm_wmi_call_mxmx(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
 156         mxm_wmi_call_mxds(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
 157         return nouveau_dsm(handle, NOUVEAU_DSM_LED, mux_id);
 158 }
 159
 160 static int nouveau_dsm_set_discrete_state(acpi_handle handle, enum vga_switcheroo_state state)
 161 {
 162         int arg;
 163         if (state == VGA_SWITCHEROO_ON)
 164                 arg = NOUVEAU_DSM_POWER_SPEED;
 165         else
 166                 arg = NOUVEAU_DSM_POWER_STAMINA;
 167         nouveau_dsm(handle, NOUVEAU_DSM_POWER, arg);
 168         return 0;
 169 }
 170
 171 static int nouveau_dsm_switchto(enum vga_switcheroo_client_id id)
 172 {
 173         if (!nouveau_dsm_priv.dsm_detected)
 174                 return 0;
 175         if (id == VGA_SWITCHEROO_IGD)
 176                 return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_STAMINA);
 177         else
 178                 return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_SPEED);
 179 }
 180
 181 static int nouveau_dsm_power_state(enum vga_switcheroo_client_id id,
 182                                    enum vga_switcheroo_state state)
 183 {
 184         if (id == VGA_SWITCHEROO_IGD)
 185                 return 0;
 186
 187         /* Optimus laptops have the card already disabled in
 188          * nouveau_switcheroo_set_state */
 189         if (!nouveau_dsm_priv.dsm_detected)
 190                 return 0;
 191
 192         return nouveau_dsm_set_discrete_state(nouveau_dsm_priv.dhandle, state);
 193 }
 194
 195 static enum vga_switcheroo_client_id nouveau_dsm_get_client_id(struct pci_dev *pdev)
 196 {
 197         /* easy option one - intel vendor ID means Integrated */
 198         if (pdev->vendor == PCI_VENDOR_ID_INTEL)
 199                 return VGA_SWITCHEROO_IGD;
 200
 201         /* is this device on Bus 0? - this may need improving */
 202         if (pdev->bus->number == 0)
 203                 return VGA_SWITCHEROO_IGD;
 204
 205         return VGA_SWITCHEROO_DIS;
 206 }
 207
 208 static const struct vga_switcheroo_handler nouveau_dsm_handler = {
 209         .switchto = nouveau_dsm_switchto,
 210         .power_state = nouveau_dsm_power_state,
 211         .get_client_id = nouveau_dsm_get_client_id,
 212 };
 213
 214 static void nouveau_dsm_pci_probe(struct pci_dev *pdev, acpi_handle *dhandle_out,
 215                                   bool *has_mux, bool *has_opt,
 216                                   bool *has_opt_flags, bool *has_pr3)
 217 {
 218         acpi_handle dhandle;
 219         bool supports_mux;
 220         int optimus_funcs;
 221         struct pci_dev *parent_pdev;
 222
 223         *has_pr3 = false;
 224         parent_pdev = pci_upstream_bridge(pdev);
 225         if (parent_pdev) {
 226                 if (parent_pdev->bridge_d3)
 227                         *has_pr3 = pci_pr3_present(parent_pdev);
 228                 else
 229                         pci_d3cold_disable(pdev);
 230         }
 231
 232         dhandle = ACPI_HANDLE(&pdev->dev);
 233         if (!dhandle)
 234                 return;
 235
 236         if (!acpi_has_method(dhandle, "_DSM"))
 237                 return;
 238
 239         supports_mux = acpi_check_dsm(dhandle, &nouveau_dsm_muid, 0x00000102,
 240                                       1 << NOUVEAU_DSM_POWER);
 241         optimus_funcs = nouveau_dsm_get_optimus_functions(dhandle);
 242
 243         /* Does not look like a Nvidia device. */
 244         if (!supports_mux && !optimus_funcs)
 245                 return;
 246
 247         *dhandle_out = dhandle;
 248         *has_mux = supports_mux;
 249         *has_opt = !!optimus_funcs;
 250         *has_opt_flags = optimus_funcs & (1 << NOUVEAU_DSM_OPTIMUS_FLAGS);
 251
 252         if (optimus_funcs) {
 253                 uint32_t result;
 254                 nouveau_optimus_dsm(dhandle, NOUVEAU_DSM_OPTIMUS_CAPS, 0,
 255                                     &result);
 256                 dev_info(&pdev->dev, "optimus capabilities: %s, status %s%s\n",
 257                          (result & OPTIMUS_ENABLED) ? "enabled" : "disabled",
 258                          (result & OPTIMUS_DYNAMIC_PWR_CAP) ? "dynamic power, " : "",
 259                          (result & OPTIMUS_HDA_CODEC_MASK) ? "hda bios codec supported" : "");
 260         }
 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         acpi_handle dhandle = NULL;
 269         bool has_mux = false;
 270         bool has_optimus = false;
 271         bool has_optimus_flags = false;
 272         bool has_power_resources = false;
 273         int vga_count = 0;
 274         bool guid_valid;
 275         bool ret = false;
 276
 277         /* lookup the MXM GUID */
 278         guid_valid = mxm_wmi_supported();
 279
 280         if (guid_valid)
 281                 printk("MXM: GUID detected in BIOS\n");
 282
 283         /* now do DSM detection */
 284         while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
 285                 vga_count++;
 286
 287                 nouveau_dsm_pci_probe(pdev, &dhandle, &has_mux, &has_optimus,
 288                                       &has_optimus_flags, &has_power_resources);
 289         }
 290
 291         while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_3D << 8, pdev)) != NULL) {
 292                 vga_count++;
 293
 294                 nouveau_dsm_pci_probe(pdev, &dhandle, &has_mux, &has_optimus,
 295                                       &has_optimus_flags, &has_power_resources);
 296         }
 297
 298         /* find the optimus DSM or the old v1 DSM */
 299         if (has_optimus) {
 300                 nouveau_dsm_priv.dhandle = dhandle;
 301                 acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
 302                         &buffer);
 303                 pr_info("VGA switcheroo: detected Optimus DSM method %s handle\n",
 304                         acpi_method_name);
 305                 if (has_power_resources)
 306                         pr_info("nouveau: detected PR support, will not use DSM\n");
 307                 nouveau_dsm_priv.optimus_detected = true;
 308                 nouveau_dsm_priv.optimus_flags_detected = has_optimus_flags;
 309                 nouveau_dsm_priv.optimus_skip_dsm = has_power_resources;
 310                 ret = true;
 311         } else if (vga_count == 2 && has_mux && guid_valid) {
 312                 nouveau_dsm_priv.dhandle = dhandle;
 313                 acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
 314                         &buffer);
 315                 pr_info("VGA switcheroo: detected DSM switching method %s handle\n",
 316                         acpi_method_name);
 317                 nouveau_dsm_priv.dsm_detected = true;
 318                 ret = true;
 319         }
 320
 321
 322         return ret;
 323 }
 324
 325 void nouveau_register_dsm_handler(void)
 326 {
 327         bool r;
 328
 329         r = nouveau_dsm_detect();
 330         if (!r)
 331                 return;
 332
 333         vga_switcheroo_register_handler(&nouveau_dsm_handler, 0);
 334 }
 335
 336 /* Must be called for Optimus models before the card can be turned off */
 337 void nouveau_switcheroo_optimus_dsm(void)
 338 {
 339         u32 result = 0;
 340         if (!nouveau_dsm_priv.optimus_detected || nouveau_dsm_priv.optimus_skip_dsm)
 341                 return;
 342
 343         if (nouveau_dsm_priv.optimus_flags_detected)
 344                 nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_FLAGS,
 345                                     0x3, &result);
 346
 347         nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_CAPS,
 348                 NOUVEAU_DSM_OPTIMUS_SET_POWERDOWN, &result);
 349
 350 }
 351
 352 void nouveau_unregister_dsm_handler(void)
 353 {
 354         if (nouveau_dsm_priv.optimus_detected || nouveau_dsm_priv.dsm_detected)
 355                 vga_switcheroo_unregister_handler();
 356 }
 357 #else
 358 void nouveau_register_dsm_handler(void) {}
 359 void nouveau_unregister_dsm_handler(void) {}
 360 void nouveau_switcheroo_optimus_dsm(void) {}
 361 #endif
 362
 363 void *
 364 nouveau_acpi_edid(struct drm_device *dev, struct drm_connector *connector)
 365 {
 366         struct acpi_device *acpidev;
 367         acpi_handle handle;
 368         int type, ret;
 369         void *edid;
 370
 371         switch (connector->connector_type) {
 372         case DRM_MODE_CONNECTOR_LVDS:
 373         case DRM_MODE_CONNECTOR_eDP:
 374                 type = ACPI_VIDEO_DISPLAY_LCD;
 375                 break;
 376         default:
 377                 return NULL;
 378         }
 379
 380         handle = ACPI_HANDLE(&dev->pdev->dev);
 381         if (!handle)
 382                 return NULL;
 383
 384         ret = acpi_bus_get_device(handle, &acpidev);
 385         if (ret)
 386                 return NULL;
 387
 388         ret = acpi_video_get_edid(acpidev, type, -1, &edid);
 389         if (ret < 0)
 390                 return NULL;
 391
 392         return kmemdup(edid, EDID_LENGTH, GFP_KERNEL);
 393 }