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1// SPDX-License-Identifier: MIT2#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 0x0214#define NOUVEAU_DSM_LED_STATE 0x0015#define NOUVEAU_DSM_LED_OFF 0x1016#define NOUVEAU_DSM_LED_STAMINA 0x1117#define NOUVEAU_DSM_LED_SPEED 0x1218 19#define NOUVEAU_DSM_POWER 0x0320#define NOUVEAU_DSM_POWER_STATE 0x0021#define NOUVEAU_DSM_POWER_SPEED 0x0122#define NOUVEAU_DSM_POWER_STAMINA 0x0223 24#define NOUVEAU_DSM_OPTIMUS_CAPS 0x1A25#define NOUVEAU_DSM_OPTIMUS_FLAGS 0x1B26 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 46static 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 54bool nouveau_is_optimus(void) {55 return nouveau_dsm_priv.optimus_detected;56}57 58bool nouveau_is_v1_dsm(void) {59 return nouveau_dsm_priv.dsm_detected;60}61 62#ifdef CONFIG_VGA_SWITCHEROO63static const guid_t nouveau_dsm_muid =64 GUID_INIT(0x9D95A0A0, 0x0060, 0x4D48,65 0xB3, 0x4D, 0x7E, 0x5F, 0xEA, 0x12, 0x9F, 0xD4);66 67static const guid_t nouveau_op_dsm_muid =68 GUID_INIT(0xA486D8F8, 0x0BDA, 0x471B,69 0xA7, 0x2B, 0x60, 0x42, 0xA6, 0xB5, 0xBE, 0xE0);70 71static 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_buff80 };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 special107 * requirements on the fourth parameter, so a private implementation108 * instead of using acpi_check_dsm().109 */110static 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 it117 */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 supported124 */125 if (result & 1 && result & (1 << NOUVEAU_DSM_OPTIMUS_CAPS))126 return result;127 return 0;128}129 130static 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 153static 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 160static 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 else166 arg = NOUVEAU_DSM_POWER_STAMINA;167 nouveau_dsm(handle, NOUVEAU_DSM_POWER, arg);168 return 0;169}170 171static 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 else178 return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_SPEED);179}180 181static 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 in188 * 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 195static 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 208static 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 214static 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 if (pdev->vendor != PCI_VENDOR_ID_NVIDIA)224 return;225 226 *has_pr3 = false;227 parent_pdev = pci_upstream_bridge(pdev);228 if (parent_pdev) {229 if (parent_pdev->bridge_d3)230 *has_pr3 = pci_pr3_present(parent_pdev);231 else232 pci_d3cold_disable(pdev);233 }234 235 dhandle = ACPI_HANDLE(&pdev->dev);236 if (!dhandle)237 return;238 239 if (!acpi_has_method(dhandle, "_DSM"))240 return;241 242 supports_mux = acpi_check_dsm(dhandle, &nouveau_dsm_muid, 0x00000102,243 1 << NOUVEAU_DSM_POWER);244 optimus_funcs = nouveau_dsm_get_optimus_functions(dhandle);245 246 /* Does not look like a Nvidia device. */247 if (!supports_mux && !optimus_funcs)248 return;249 250 *dhandle_out = dhandle;251 *has_mux = supports_mux;252 *has_opt = !!optimus_funcs;253 *has_opt_flags = optimus_funcs & (1 << NOUVEAU_DSM_OPTIMUS_FLAGS);254 255 if (optimus_funcs) {256 uint32_t result;257 nouveau_optimus_dsm(dhandle, NOUVEAU_DSM_OPTIMUS_CAPS, 0,258 &result);259 dev_info(&pdev->dev, "optimus capabilities: %s, status %s%s\n",260 (result & OPTIMUS_ENABLED) ? "enabled" : "disabled",261 (result & OPTIMUS_DYNAMIC_PWR_CAP) ? "dynamic power, " : "",262 (result & OPTIMUS_HDA_CODEC_MASK) ? "hda bios codec supported" : "");263 }264}265 266static bool nouveau_dsm_detect(void)267{268 char acpi_method_name[255] = { 0 };269 struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};270 struct pci_dev *pdev = NULL;271 acpi_handle dhandle = NULL;272 bool has_mux = false;273 bool has_optimus = false;274 bool has_optimus_flags = false;275 bool has_power_resources = false;276 int vga_count = 0;277 bool guid_valid;278 bool ret = false;279 280 /* lookup the MXM GUID */281 guid_valid = mxm_wmi_supported();282 283 if (guid_valid)284 printk("MXM: GUID detected in BIOS\n");285 286 /* now do DSM detection */287 while ((pdev = pci_get_base_class(PCI_BASE_CLASS_DISPLAY, pdev))) {288 if ((pdev->class != PCI_CLASS_DISPLAY_VGA << 8) &&289 (pdev->class != PCI_CLASS_DISPLAY_3D << 8))290 continue;291 292 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 325void 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 */337void 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 352void 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#else358void nouveau_register_dsm_handler(void) {}359void nouveau_unregister_dsm_handler(void) {}360void nouveau_switcheroo_optimus_dsm(void) {}361#endif362 363void *364nouveau_acpi_edid(struct drm_device *dev, struct drm_connector *connector)365{366 struct acpi_device *acpidev;367 int type, ret;368 void *edid;369 370 switch (connector->connector_type) {371 case DRM_MODE_CONNECTOR_LVDS:372 case DRM_MODE_CONNECTOR_eDP:373 type = ACPI_VIDEO_DISPLAY_LCD;374 break;375 default:376 return NULL;377 }378 379 acpidev = ACPI_COMPANION(dev->dev);380 if (!acpidev)381 return NULL;382 383 ret = acpi_video_get_edid(acpidev, type, -1, &edid);384 if (ret < 0)385 return NULL;386 387 return kmemdup(edid, EDID_LENGTH, GFP_KERNEL);388}389 390bool nouveau_acpi_video_backlight_use_native(void)391{392 return acpi_video_backlight_use_native();393}394 395void nouveau_acpi_video_register_backlight(void)396{397 acpi_video_register_backlight();398}399