| // SPDX-License-Identifier: MIT |
| #include <linux/pci.h> |
| #include <linux/acpi.h> |
| #include <linux/slab.h> |
| #include <linux/mxm-wmi.h> |
| #include <linux/vga_switcheroo.h> |
| #include <drm/drm_edid.h> |
| #include <acpi/video.h> |
| |
| #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; |
| 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; |
| } |
| |
| acpidev = ACPI_COMPANION(dev->dev); |
| if (!acpidev) |
| return NULL; |
| |
| ret = acpi_video_get_edid(acpidev, type, -1, &edid); |
| if (ret < 0) |
| return NULL; |
| |
| return kmemdup(edid, EDID_LENGTH, GFP_KERNEL); |
| } |