// SPDX-License-Identifier: MIT #include #include #include #include #include #include #include #include "nouveau_drv.h" #include "nouveau_acpi.h" #define NOUVEAU_DSM_LED 0x02 #define NOUVEAU_DSM_LED_STATE 0x00 #define NOUVEAU_DSM_LED_OFF 0x10 #define NOUVEAU_DSM_LED_STAMINA 0x11 #define NOUVEAU_DSM_LED_SPEED 0x12 #define NOUVEAU_DSM_POWER 0x03 #define NOUVEAU_DSM_POWER_STATE 0x00 #define NOUVEAU_DSM_POWER_SPEED 0x01 #define NOUVEAU_DSM_POWER_STAMINA 0x02 #define NOUVEAU_DSM_OPTIMUS_CAPS 0x1A #define NOUVEAU_DSM_OPTIMUS_FLAGS 0x1B #define NOUVEAU_DSM_OPTIMUS_POWERDOWN_PS3 (3 << 24) #define NOUVEAU_DSM_OPTIMUS_NO_POWERDOWN_PS3 (2 << 24) #define NOUVEAU_DSM_OPTIMUS_FLAGS_CHANGED (1) #define NOUVEAU_DSM_OPTIMUS_SET_POWERDOWN (NOUVEAU_DSM_OPTIMUS_POWERDOWN_PS3 | NOUVEAU_DSM_OPTIMUS_FLAGS_CHANGED) /* result of the optimus caps function */ #define OPTIMUS_ENABLED (1 << 0) #define OPTIMUS_STATUS_MASK (3 << 3) #define OPTIMUS_STATUS_OFF (0 << 3) #define OPTIMUS_STATUS_ON_ENABLED (1 << 3) #define OPTIMUS_STATUS_PWR_STABLE (3 << 3) #define OPTIMUS_DISPLAY_HOTPLUG (1 << 6) #define OPTIMUS_CAPS_MASK (7 << 24) #define OPTIMUS_DYNAMIC_PWR_CAP (1 << 24) #define OPTIMUS_AUDIO_CAPS_MASK (3 << 27) #define OPTIMUS_HDA_CODEC_MASK (2 << 27) /* hda bios control */ static struct nouveau_dsm_priv { bool dsm_detected; bool optimus_detected; bool optimus_flags_detected; bool optimus_skip_dsm; acpi_handle dhandle; } nouveau_dsm_priv; bool nouveau_is_optimus(void) { return nouveau_dsm_priv.optimus_detected; } bool nouveau_is_v1_dsm(void) { return nouveau_dsm_priv.dsm_detected; } #ifdef CONFIG_VGA_SWITCHEROO static const guid_t nouveau_dsm_muid = GUID_INIT(0x9D95A0A0, 0x0060, 0x4D48, 0xB3, 0x4D, 0x7E, 0x5F, 0xEA, 0x12, 0x9F, 0xD4); static const guid_t nouveau_op_dsm_muid = GUID_INIT(0xA486D8F8, 0x0BDA, 0x471B, 0xA7, 0x2B, 0x60, 0x42, 0xA6, 0xB5, 0xBE, 0xE0); static int nouveau_optimus_dsm(acpi_handle handle, int func, int arg, uint32_t *result) { int i; union acpi_object *obj; char args_buff[4]; union acpi_object argv4 = { .buffer.type = ACPI_TYPE_BUFFER, .buffer.length = 4, .buffer.pointer = args_buff }; /* ACPI is little endian, AABBCCDD becomes {DD,CC,BB,AA} */ for (i = 0; i < 4; i++) args_buff[i] = (arg >> i * 8) & 0xFF; *result = 0; obj = acpi_evaluate_dsm_typed(handle, &nouveau_op_dsm_muid, 0x00000100, func, &argv4, ACPI_TYPE_BUFFER); if (!obj) { acpi_handle_info(handle, "failed to evaluate _DSM\n"); return AE_ERROR; } else { if (obj->buffer.length == 4) { *result |= obj->buffer.pointer[0]; *result |= (obj->buffer.pointer[1] << 8); *result |= (obj->buffer.pointer[2] << 16); *result |= (obj->buffer.pointer[3] << 24); } ACPI_FREE(obj); } return 0; } /* * On some platforms, _DSM(nouveau_op_dsm_muid, func0) has special * requirements on the fourth parameter, so a private implementation * instead of using acpi_check_dsm(). */ static int nouveau_dsm_get_optimus_functions(acpi_handle handle) { int result; /* * Function 0 returns a Buffer containing available functions. * The args parameter is ignored for function 0, so just put 0 in it */ if (nouveau_optimus_dsm(handle, 0, 0, &result)) return 0; /* * ACPI Spec v4 9.14.1: if bit 0 is zero, no function is supported. * If the n-th bit is enabled, function n is supported */ if (result & 1 && result & (1 << NOUVEAU_DSM_OPTIMUS_CAPS)) return result; return 0; } static int nouveau_dsm(acpi_handle handle, int func, int arg) { int ret = 0; union acpi_object *obj; union acpi_object argv4 = { .integer.type = ACPI_TYPE_INTEGER, .integer.value = arg, }; obj = acpi_evaluate_dsm_typed(handle, &nouveau_dsm_muid, 0x00000102, func, &argv4, ACPI_TYPE_INTEGER); if (!obj) { acpi_handle_info(handle, "failed to evaluate _DSM\n"); return AE_ERROR; } else { if (obj->integer.value == 0x80000002) ret = -ENODEV; ACPI_FREE(obj); } return ret; } static int nouveau_dsm_switch_mux(acpi_handle handle, int mux_id) { mxm_wmi_call_mxmx(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0); mxm_wmi_call_mxds(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0); return nouveau_dsm(handle, NOUVEAU_DSM_LED, mux_id); } static int nouveau_dsm_set_discrete_state(acpi_handle handle, enum vga_switcheroo_state state) { int arg; if (state == VGA_SWITCHEROO_ON) arg = NOUVEAU_DSM_POWER_SPEED; else arg = NOUVEAU_DSM_POWER_STAMINA; nouveau_dsm(handle, NOUVEAU_DSM_POWER, arg); return 0; } static int nouveau_dsm_switchto(enum vga_switcheroo_client_id id) { if (!nouveau_dsm_priv.dsm_detected) return 0; if (id == VGA_SWITCHEROO_IGD) return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_STAMINA); else return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_SPEED); } static int nouveau_dsm_power_state(enum vga_switcheroo_client_id id, enum vga_switcheroo_state state) { if (id == VGA_SWITCHEROO_IGD) return 0; /* Optimus laptops have the card already disabled in * nouveau_switcheroo_set_state */ if (!nouveau_dsm_priv.dsm_detected) return 0; return nouveau_dsm_set_discrete_state(nouveau_dsm_priv.dhandle, state); } static enum vga_switcheroo_client_id nouveau_dsm_get_client_id(struct pci_dev *pdev) { /* easy option one - intel vendor ID means Integrated */ if (pdev->vendor == PCI_VENDOR_ID_INTEL) return VGA_SWITCHEROO_IGD; /* is this device on Bus 0? - this may need improving */ if (pdev->bus->number == 0) return VGA_SWITCHEROO_IGD; return VGA_SWITCHEROO_DIS; } static const struct vga_switcheroo_handler nouveau_dsm_handler = { .switchto = nouveau_dsm_switchto, .power_state = nouveau_dsm_power_state, .get_client_id = nouveau_dsm_get_client_id, }; static void nouveau_dsm_pci_probe(struct pci_dev *pdev, acpi_handle *dhandle_out, bool *has_mux, bool *has_opt, bool *has_opt_flags, bool *has_pr3) { acpi_handle dhandle; bool supports_mux; int optimus_funcs; struct pci_dev *parent_pdev; *has_pr3 = false; parent_pdev = pci_upstream_bridge(pdev); if (parent_pdev) { if (parent_pdev->bridge_d3) *has_pr3 = pci_pr3_present(parent_pdev); else pci_d3cold_disable(pdev); } dhandle = ACPI_HANDLE(&pdev->dev); if (!dhandle) return; if (!acpi_has_method(dhandle, "_DSM")) return; supports_mux = acpi_check_dsm(dhandle, &nouveau_dsm_muid, 0x00000102, 1 << NOUVEAU_DSM_POWER); optimus_funcs = nouveau_dsm_get_optimus_functions(dhandle); /* Does not look like a Nvidia device. */ if (!supports_mux && !optimus_funcs) return; *dhandle_out = dhandle; *has_mux = supports_mux; *has_opt = !!optimus_funcs; *has_opt_flags = optimus_funcs & (1 << NOUVEAU_DSM_OPTIMUS_FLAGS); if (optimus_funcs) { uint32_t result; nouveau_optimus_dsm(dhandle, NOUVEAU_DSM_OPTIMUS_CAPS, 0, &result); dev_info(&pdev->dev, "optimus capabilities: %s, status %s%s\n", (result & OPTIMUS_ENABLED) ? "enabled" : "disabled", (result & OPTIMUS_DYNAMIC_PWR_CAP) ? "dynamic power, " : "", (result & OPTIMUS_HDA_CODEC_MASK) ? "hda bios codec supported" : ""); } } static bool nouveau_dsm_detect(void) { char acpi_method_name[255] = { 0 }; struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name}; struct pci_dev *pdev = NULL; acpi_handle dhandle = NULL; bool has_mux = false; bool has_optimus = false; bool has_optimus_flags = false; bool has_power_resources = false; int vga_count = 0; bool guid_valid; bool ret = false; /* lookup the MXM GUID */ guid_valid = mxm_wmi_supported(); if (guid_valid) printk("MXM: GUID detected in BIOS\n"); /* now do DSM detection */ while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) { vga_count++; nouveau_dsm_pci_probe(pdev, &dhandle, &has_mux, &has_optimus, &has_optimus_flags, &has_power_resources); } while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_3D << 8, pdev)) != NULL) { vga_count++; nouveau_dsm_pci_probe(pdev, &dhandle, &has_mux, &has_optimus, &has_optimus_flags, &has_power_resources); } /* find the optimus DSM or the old v1 DSM */ if (has_optimus) { nouveau_dsm_priv.dhandle = dhandle; acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME, &buffer); pr_info("VGA switcheroo: detected Optimus DSM method %s handle\n", acpi_method_name); if (has_power_resources) pr_info("nouveau: detected PR support, will not use DSM\n"); nouveau_dsm_priv.optimus_detected = true; nouveau_dsm_priv.optimus_flags_detected = has_optimus_flags; nouveau_dsm_priv.optimus_skip_dsm = has_power_resources; ret = true; } else if (vga_count == 2 && has_mux && guid_valid) { nouveau_dsm_priv.dhandle = dhandle; acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME, &buffer); pr_info("VGA switcheroo: detected DSM switching method %s handle\n", acpi_method_name); nouveau_dsm_priv.dsm_detected = true; ret = true; } return ret; } void nouveau_register_dsm_handler(void) { bool r; r = nouveau_dsm_detect(); if (!r) return; vga_switcheroo_register_handler(&nouveau_dsm_handler, 0); } /* Must be called for Optimus models before the card can be turned off */ void nouveau_switcheroo_optimus_dsm(void) { u32 result = 0; if (!nouveau_dsm_priv.optimus_detected || nouveau_dsm_priv.optimus_skip_dsm) return; if (nouveau_dsm_priv.optimus_flags_detected) nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_FLAGS, 0x3, &result); nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_CAPS, NOUVEAU_DSM_OPTIMUS_SET_POWERDOWN, &result); } void nouveau_unregister_dsm_handler(void) { if (nouveau_dsm_priv.optimus_detected || nouveau_dsm_priv.dsm_detected) vga_switcheroo_unregister_handler(); } #else void nouveau_register_dsm_handler(void) {} void nouveau_unregister_dsm_handler(void) {} void nouveau_switcheroo_optimus_dsm(void) {} #endif void * nouveau_acpi_edid(struct drm_device *dev, struct drm_connector *connector) { struct acpi_device *acpidev; acpi_handle handle; int type, ret; void *edid; switch (connector->connector_type) { case DRM_MODE_CONNECTOR_LVDS: case DRM_MODE_CONNECTOR_eDP: type = ACPI_VIDEO_DISPLAY_LCD; break; default: return NULL; } handle = ACPI_HANDLE(&dev->pdev->dev); if (!handle) return NULL; ret = acpi_bus_get_device(handle, &acpidev); if (ret) return NULL; ret = acpi_video_get_edid(acpidev, type, -1, &edid); if (ret < 0) return NULL; return kmemdup(edid, EDID_LENGTH, GFP_KERNEL); }