| /* |
| * 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 <linux/acpi.h> |
| #include <linux/pci.h> |
| #include <linux/delay.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; |
| bool is_hybrid; |
| }; |
| |
| 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_px_params { |
| u16 size; /* structure size in bytes (includes size field) */ |
| u32 valid_flags; /* which flags are valid */ |
| u32 flags; /* flags */ |
| } __packed; |
| |
| struct atpx_power_control { |
| u16 size; |
| u8 dgpu_state; |
| } __packed; |
| |
| struct atpx_mux { |
| u16 size; |
| u16 mux; |
| } __packed; |
| |
| bool radeon_has_atpx(void) { |
| return radeon_atpx_priv.atpx_detected; |
| } |
| |
| bool radeon_has_atpx_dgpu_power_cntl(void) { |
| return radeon_atpx_priv.atpx.functions.power_cntl; |
| } |
| |
| bool radeon_is_atpx_hybrid(void) { |
| return radeon_atpx_priv.atpx.is_hybrid; |
| } |
| |
| /** |
| * 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_validate_functions - validate ATPX functions |
| * |
| * @atpx: radeon atpx struct |
| * |
| * Validate that required functions are enabled (all asics). |
| * returns 0 on success, error on failure. |
| */ |
| static int radeon_atpx_validate(struct radeon_atpx *atpx) |
| { |
| u32 valid_bits = 0; |
| |
| if (atpx->functions.px_params) { |
| union acpi_object *info; |
| struct atpx_px_params output; |
| size_t size; |
| |
| info = radeon_atpx_call(atpx->handle, ATPX_FUNCTION_GET_PX_PARAMETERS, NULL); |
| if (!info) |
| return -EIO; |
| |
| memset(&output, 0, sizeof(output)); |
| |
| size = *(u16 *) info->buffer.pointer; |
| if (size < 10) { |
| printk("ATPX buffer is too small: %zu\n", size); |
| kfree(info); |
| return -EINVAL; |
| } |
| size = min(sizeof(output), size); |
| |
| memcpy(&output, info->buffer.pointer, size); |
| |
| valid_bits = output.flags & output.valid_flags; |
| |
| kfree(info); |
| } |
| |
| /* if separate mux flag is set, mux controls are required */ |
| if (valid_bits & ATPX_SEPARATE_MUX_FOR_I2C) { |
| atpx->functions.i2c_mux_cntl = true; |
| atpx->functions.disp_mux_cntl = true; |
| } |
| /* if any outputs are muxed, mux controls are required */ |
| if (valid_bits & (ATPX_CRT1_RGB_SIGNAL_MUXED | |
| ATPX_TV_SIGNAL_MUXED | |
| ATPX_DFP_SIGNAL_MUXED)) |
| atpx->functions.disp_mux_cntl = true; |
| |
| /* some bioses set these bits rather than flagging power_cntl as supported */ |
| if (valid_bits & (ATPX_DYNAMIC_PX_SUPPORTED | |
| ATPX_DYNAMIC_DGPU_POWER_OFF_SUPPORTED)) |
| atpx->functions.power_cntl = true; |
| |
| atpx->is_hybrid = false; |
| if (valid_bits & ATPX_MS_HYBRID_GFX_SUPPORTED) { |
| printk("ATPX Hybrid Graphics\n"); |
| #if 1 |
| /* This is a temporary hack until the D3 cold support |
| * makes it upstream. The ATPX power_control method seems |
| * to still work on even if the system should be using |
| * the new standardized hybrid D3 cold ACPI interface. |
| */ |
| atpx->functions.power_cntl = true; |
| #else |
| atpx->functions.power_cntl = false; |
| #endif |
| atpx->is_hybrid = true; |
| } |
| |
| return 0; |
| } |
| |
| /** |
| * radeon_atpx_verify_interface - verify ATPX |
| * |
| * @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, functions 0x%08x\n", |
| output.version, output.function_bits); |
| |
| 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); |
| |
| /* 200ms delay is required after off */ |
| if (state == 0) |
| msleep(200); |
| } |
| 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 = 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) |
| { |
| int r; |
| |
| /* set up the ATPX handle */ |
| r = radeon_atpx_verify_interface(&radeon_atpx_priv.atpx); |
| if (r) |
| return r; |
| |
| /* validate the atpx setup */ |
| r = radeon_atpx_validate(&radeon_atpx_priv.atpx); |
| if (r) |
| return r; |
| |
| return 0; |
| } |
| |
| /** |
| * 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 == ACPI_HANDLE(&pdev->dev)) |
| return VGA_SWITCHEROO_IGD; |
| else |
| return VGA_SWITCHEROO_DIS; |
| } |
| |
| static const 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); |
| } |
| |
| /* some newer PX laptops mark the dGPU as a non-VGA display device */ |
| while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_OTHER << 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; |
| enum vga_switcheroo_handler_flags_t handler_flags = 0; |
| |
| /* 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, handler_flags); |
| } |
| |
| /** |
| * 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(); |
| } |