/* * Copyright (c) 2010 Red Hat Inc. * Author : Dave Airlie <airlied@redhat.com> * * Licensed under GPLv2 * * ATPX support for both Intel/ATI */ #include <linux/vga_switcheroo.h> #include <linux/slab.h> #include <acpi/acpi.h> #include <acpi/acpi_bus.h> #include <linux/pci.h> #include "radeon_acpi.h" struct radeon_atpx_functions { bool px_params; bool power_cntl; bool disp_mux_cntl; bool i2c_mux_cntl; bool switch_start; bool switch_end; bool disp_connectors_mapping; bool disp_detetion_ports; }; struct radeon_atpx { acpi_handle handle; struct radeon_atpx_functions functions; }; static struct radeon_atpx_priv { bool atpx_detected; /* handle for device - and atpx */ acpi_handle dhandle; struct radeon_atpx atpx; } radeon_atpx_priv; struct atpx_verify_interface { u16 size; /* structure size in bytes (includes size field) */ u16 version; /* version */ u32 function_bits; /* supported functions bit vector */ } __packed; struct atpx_power_control { u16 size; u8 dgpu_state; } __packed; struct atpx_mux { u16 size; u16 mux; } __packed; /** * radeon_atpx_call - call an ATPX method * * @handle: acpi handle * @function: the ATPX function to execute * @params: ATPX function params * * Executes the requested ATPX function (all asics). * Returns a pointer to the acpi output buffer. */ static union acpi_object *radeon_atpx_call(acpi_handle handle, int function, struct acpi_buffer *params) { acpi_status status; union acpi_object atpx_arg_elements[2]; struct acpi_object_list atpx_arg; struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; atpx_arg.count = 2; atpx_arg.pointer = &atpx_arg_elements[0]; atpx_arg_elements[0].type = ACPI_TYPE_INTEGER; atpx_arg_elements[0].integer.value = function; if (params) { atpx_arg_elements[1].type = ACPI_TYPE_BUFFER; atpx_arg_elements[1].buffer.length = params->length; atpx_arg_elements[1].buffer.pointer = params->pointer; } else { /* We need a second fake parameter */ atpx_arg_elements[1].type = ACPI_TYPE_INTEGER; atpx_arg_elements[1].integer.value = 0; } status = acpi_evaluate_object(handle, NULL, &atpx_arg, &buffer); /* Fail only if calling the method fails and ATPX is supported */ if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { printk("failed to evaluate ATPX got %s\n", acpi_format_exception(status)); kfree(buffer.pointer); return NULL; } return buffer.pointer; } /** * radeon_atpx_parse_functions - parse supported functions * * @f: supported functions struct * @mask: supported functions mask from ATPX * * Use the supported functions mask from ATPX function * ATPX_FUNCTION_VERIFY_INTERFACE to determine what functions * are supported (all asics). */ static void radeon_atpx_parse_functions(struct radeon_atpx_functions *f, u32 mask) { f->px_params = mask & ATPX_GET_PX_PARAMETERS_SUPPORTED; f->power_cntl = mask & ATPX_POWER_CONTROL_SUPPORTED; f->disp_mux_cntl = mask & ATPX_DISPLAY_MUX_CONTROL_SUPPORTED; f->i2c_mux_cntl = mask & ATPX_I2C_MUX_CONTROL_SUPPORTED; f->switch_start = mask & ATPX_GRAPHICS_DEVICE_SWITCH_START_NOTIFICATION_SUPPORTED; f->switch_end = mask & ATPX_GRAPHICS_DEVICE_SWITCH_END_NOTIFICATION_SUPPORTED; f->disp_connectors_mapping = mask & ATPX_GET_DISPLAY_CONNECTORS_MAPPING_SUPPORTED; f->disp_detetion_ports = mask & ATPX_GET_DISPLAY_DETECTION_PORTS_SUPPORTED; } /** * radeon_atpx_verify_interface - verify ATPX * * @handle: acpi handle * @atpx: radeon atpx struct * * Execute the ATPX_FUNCTION_VERIFY_INTERFACE ATPX function * to initialize ATPX and determine what features are supported * (all asics). * returns 0 on success, error on failure. */ static int radeon_atpx_verify_interface(struct radeon_atpx *atpx) { union acpi_object *info; struct atpx_verify_interface output; size_t size; int err = 0; info = radeon_atpx_call(atpx->handle, ATPX_FUNCTION_VERIFY_INTERFACE, NULL); if (!info) return -EIO; memset(&output, 0, sizeof(output)); size = *(u16 *) info->buffer.pointer; if (size < 8) { printk("ATPX buffer is too small: %zu\n", size); err = -EINVAL; goto out; } size = min(sizeof(output), size); memcpy(&output, info->buffer.pointer, size); /* TODO: check version? */ printk("ATPX version %u\n", output.version); radeon_atpx_parse_functions(&atpx->functions, output.function_bits); out: kfree(info); return err; } /** * radeon_atpx_set_discrete_state - power up/down discrete GPU * * @atpx: atpx info struct * @state: discrete GPU state (0 = power down, 1 = power up) * * Execute the ATPX_FUNCTION_POWER_CONTROL ATPX function to * power down/up the discrete GPU (all asics). * Returns 0 on success, error on failure. */ static int radeon_atpx_set_discrete_state(struct radeon_atpx *atpx, u8 state) { struct acpi_buffer params; union acpi_object *info; struct atpx_power_control input; if (atpx->functions.power_cntl) { input.size = 3; input.dgpu_state = state; params.length = input.size; params.pointer = &input; info = radeon_atpx_call(atpx->handle, ATPX_FUNCTION_POWER_CONTROL, ¶ms); if (!info) return -EIO; kfree(info); } return 0; } /** * radeon_atpx_switch_disp_mux - switch display mux * * @atpx: atpx info struct * @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU) * * Execute the ATPX_FUNCTION_DISPLAY_MUX_CONTROL ATPX function to * switch the display mux between the discrete GPU and integrated GPU * (all asics). * Returns 0 on success, error on failure. */ static int radeon_atpx_switch_disp_mux(struct radeon_atpx *atpx, u16 mux_id) { struct acpi_buffer params; union acpi_object *info; struct atpx_mux input; if (atpx->functions.disp_mux_cntl) { input.size = 4; input.mux = mux_id; params.length = input.size; params.pointer = &input; info = radeon_atpx_call(atpx->handle, ATPX_FUNCTION_DISPLAY_MUX_CONTROL, ¶ms); if (!info) return -EIO; kfree(info); } return 0; } /** * radeon_atpx_switch_i2c_mux - switch i2c/hpd mux * * @atpx: atpx info struct * @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU) * * Execute the ATPX_FUNCTION_I2C_MUX_CONTROL ATPX function to * switch the i2c/hpd mux between the discrete GPU and integrated GPU * (all asics). * Returns 0 on success, error on failure. */ static int radeon_atpx_switch_i2c_mux(struct radeon_atpx *atpx, u16 mux_id) { struct acpi_buffer params; union acpi_object *info; struct atpx_mux input; if (atpx->functions.i2c_mux_cntl) { input.size = 4; input.mux = mux_id; params.length = input.size; params.pointer = &input; info = radeon_atpx_call(atpx->handle, ATPX_FUNCTION_I2C_MUX_CONTROL, ¶ms); if (!info) return -EIO; kfree(info); } return 0; } /** * radeon_atpx_switch_start - notify the sbios of a GPU switch * * @atpx: atpx info struct * @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU) * * Execute the ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_START_NOTIFICATION ATPX * function to notify the sbios that a switch between the discrete GPU and * integrated GPU has begun (all asics). * Returns 0 on success, error on failure. */ static int radeon_atpx_switch_start(struct radeon_atpx *atpx, u16 mux_id) { struct acpi_buffer params; union acpi_object *info; struct atpx_mux input; if (atpx->functions.switch_start) { input.size = 4; input.mux = mux_id; params.length = input.size; params.pointer = &input; info = radeon_atpx_call(atpx->handle, ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_START_NOTIFICATION, ¶ms); if (!info) return -EIO; kfree(info); } return 0; } /** * radeon_atpx_switch_end - notify the sbios of a GPU switch * * @atpx: atpx info struct * @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU) * * Execute the ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_END_NOTIFICATION ATPX * function to notify the sbios that a switch between the discrete GPU and * integrated GPU has ended (all asics). * Returns 0 on success, error on failure. */ static int radeon_atpx_switch_end(struct radeon_atpx *atpx, u16 mux_id) { struct acpi_buffer params; union acpi_object *info; struct atpx_mux input; if (atpx->functions.switch_end) { input.size = 4; input.mux = mux_id; params.length = input.size; params.pointer = &input; info = radeon_atpx_call(atpx->handle, ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_END_NOTIFICATION, ¶ms); if (!info) return -EIO; kfree(info); } return 0; } /** * radeon_atpx_switchto - switch to the requested GPU * * @id: GPU to switch to * * Execute the necessary ATPX functions to switch between the discrete GPU and * integrated GPU (all asics). * Returns 0 on success, error on failure. */ static int radeon_atpx_switchto(enum vga_switcheroo_client_id id) { u16 gpu_id; if (id == VGA_SWITCHEROO_IGD) gpu_id = ATPX_INTEGRATED_GPU; else gpu_id = ATPX_DISCRETE_GPU; radeon_atpx_switch_start(&radeon_atpx_priv.atpx, gpu_id); radeon_atpx_switch_disp_mux(&radeon_atpx_priv.atpx, gpu_id); radeon_atpx_switch_i2c_mux(&radeon_atpx_priv.atpx, gpu_id); radeon_atpx_switch_end(&radeon_atpx_priv.atpx, gpu_id); return 0; } /** * radeon_atpx_power_state - power down/up the requested GPU * * @id: GPU to power down/up * @state: requested power state (0 = off, 1 = on) * * Execute the necessary ATPX function to power down/up the discrete GPU * (all asics). * Returns 0 on success, error on failure. */ static int radeon_atpx_power_state(enum vga_switcheroo_client_id id, enum vga_switcheroo_state state) { /* on w500 ACPI can't change intel gpu state */ if (id == VGA_SWITCHEROO_IGD) return 0; radeon_atpx_set_discrete_state(&radeon_atpx_priv.atpx, state); return 0; } /** * radeon_atpx_pci_probe_handle - look up the ATPX handle * * @pdev: pci device * * Look up the ATPX handles (all asics). * Returns true if the handles are found, false if not. */ static bool radeon_atpx_pci_probe_handle(struct pci_dev *pdev) { acpi_handle dhandle, atpx_handle; acpi_status status; dhandle = DEVICE_ACPI_HANDLE(&pdev->dev); if (!dhandle) return false; status = acpi_get_handle(dhandle, "ATPX", &atpx_handle); if (ACPI_FAILURE(status)) return false; radeon_atpx_priv.dhandle = dhandle; radeon_atpx_priv.atpx.handle = atpx_handle; return true; } /** * radeon_atpx_init - verify the ATPX interface * * Verify the ATPX interface (all asics). * Returns 0 on success, error on failure. */ static int radeon_atpx_init(void) { /* set up the ATPX handle */ return radeon_atpx_verify_interface(&radeon_atpx_priv.atpx); } /** * radeon_atpx_get_client_id - get the client id * * @pdev: pci device * * look up whether we are the integrated or discrete GPU (all asics). * Returns the client id. */ static int radeon_atpx_get_client_id(struct pci_dev *pdev) { if (radeon_atpx_priv.dhandle == DEVICE_ACPI_HANDLE(&pdev->dev)) return VGA_SWITCHEROO_IGD; else return VGA_SWITCHEROO_DIS; } static struct vga_switcheroo_handler radeon_atpx_handler = { .switchto = radeon_atpx_switchto, .power_state = radeon_atpx_power_state, .init = radeon_atpx_init, .get_client_id = radeon_atpx_get_client_id, }; /** * radeon_atpx_detect - detect whether we have PX * * Check if we have a PX system (all asics). * Returns true if we have a PX system, false if not. */ static bool radeon_atpx_detect(void) { char acpi_method_name[255] = { 0 }; struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name}; struct pci_dev *pdev = NULL; bool has_atpx = false; int vga_count = 0; while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) { vga_count++; has_atpx |= (radeon_atpx_pci_probe_handle(pdev) == true); } if (has_atpx && vga_count == 2) { acpi_get_name(radeon_atpx_priv.atpx.handle, ACPI_FULL_PATHNAME, &buffer); printk(KERN_INFO "VGA switcheroo: detected switching method %s handle\n", acpi_method_name); radeon_atpx_priv.atpx_detected = true; return true; } return false; } /** * radeon_register_atpx_handler - register with vga_switcheroo * * Register the PX callbacks with vga_switcheroo (all asics). */ void radeon_register_atpx_handler(void) { bool r; /* detect if we have any ATPX + 2 VGA in the system */ r = radeon_atpx_detect(); if (!r) return; vga_switcheroo_register_handler(&radeon_atpx_handler); } /** * radeon_unregister_atpx_handler - unregister with vga_switcheroo * * Unregister the PX callbacks with vga_switcheroo (all asics). */ void radeon_unregister_atpx_handler(void) { vga_switcheroo_unregister_handler(); }