/* * 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 "amdgpu_acpi.h" struct amdgpu_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 amdgpu_atpx {	acpi_handle handle;	struct amdgpu_atpx_functions functions;}; static struct amdgpu_atpx_priv {	bool atpx_detected;	/* handle for device - and atpx */	acpi_handle dhandle;	acpi_handle other_handle;	struct amdgpu_atpx atpx;} amdgpu_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 amdgpu_has_atpx(void) {	return amdgpu_atpx_priv.atpx_detected;} /** * amdgpu_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 *amdgpu_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;} /** * amdgpu_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 amdgpu_atpx_parse_functions(struct amdgpu_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;} /** * amdgpu_atpx_validate_functions - validate ATPX functions * * @atpx: amdgpu atpx struct * * Validate that required functions are enabled (all asics). * returns 0 on success, error on failure. */static int amdgpu_atpx_validate(struct amdgpu_atpx *atpx){	/* make sure required functions are enabled */	/* dGPU power control is required */	atpx->functions.power_cntl = true; 	if (atpx->functions.px_params) {		union acpi_object *info;		struct atpx_px_params output;		size_t size;		u32 valid_bits; 		info = amdgpu_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;		/* 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; 		kfree(info);	}	return 0;} /** * amdgpu_atpx_verify_interface - verify ATPX * * @atpx: amdgpu 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 amdgpu_atpx_verify_interface(struct amdgpu_atpx *atpx){	union acpi_object *info;	struct atpx_verify_interface output;	size_t size;	int err = 0; 	info = amdgpu_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); 	amdgpu_atpx_parse_functions(&atpx->functions, output.function_bits); out:	kfree(info);	return err;} /** * amdgpu_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 amdgpu_atpx_set_discrete_state(struct amdgpu_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 = amdgpu_atpx_call(atpx->handle,					ATPX_FUNCTION_POWER_CONTROL,					&params);		if (!info)			return -EIO;		kfree(info);	}	return 0;} /** * amdgpu_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 amdgpu_atpx_switch_disp_mux(struct amdgpu_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 = amdgpu_atpx_call(atpx->handle,					ATPX_FUNCTION_DISPLAY_MUX_CONTROL,					&params);		if (!info)			return -EIO;		kfree(info);	}	return 0;} /** * amdgpu_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 amdgpu_atpx_switch_i2c_mux(struct amdgpu_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 = amdgpu_atpx_call(atpx->handle,					ATPX_FUNCTION_I2C_MUX_CONTROL,					&params);		if (!info)			return -EIO;		kfree(info);	}	return 0;} /** * amdgpu_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 amdgpu_atpx_switch_start(struct amdgpu_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 = amdgpu_atpx_call(atpx->handle,					ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_START_NOTIFICATION,					&params);		if (!info)			return -EIO;		kfree(info);	}	return 0;} /** * amdgpu_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 amdgpu_atpx_switch_end(struct amdgpu_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 = amdgpu_atpx_call(atpx->handle,					ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_END_NOTIFICATION,					&params);		if (!info)			return -EIO;		kfree(info);	}	return 0;} /** * amdgpu_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 amdgpu_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; 	amdgpu_atpx_switch_start(&amdgpu_atpx_priv.atpx, gpu_id);	amdgpu_atpx_switch_disp_mux(&amdgpu_atpx_priv.atpx, gpu_id);	amdgpu_atpx_switch_i2c_mux(&amdgpu_atpx_priv.atpx, gpu_id);	amdgpu_atpx_switch_end(&amdgpu_atpx_priv.atpx, gpu_id); 	return 0;} /** * amdgpu_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 amdgpu_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; 	amdgpu_atpx_set_discrete_state(&amdgpu_atpx_priv.atpx, state);	return 0;} /** * amdgpu_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 amdgpu_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)) {		amdgpu_atpx_priv.other_handle = dhandle;		return false;	}	amdgpu_atpx_priv.dhandle = dhandle;	amdgpu_atpx_priv.atpx.handle = atpx_handle;	return true;} /** * amdgpu_atpx_init - verify the ATPX interface * * Verify the ATPX interface (all asics). * Returns 0 on success, error on failure. */static int amdgpu_atpx_init(void){	int r; 	/* set up the ATPX handle */	r = amdgpu_atpx_verify_interface(&amdgpu_atpx_priv.atpx);	if (r)		return r; 	/* validate the atpx setup */	r = amdgpu_atpx_validate(&amdgpu_atpx_priv.atpx);	if (r)		return r; 	return 0;} /** * amdgpu_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 amdgpu_atpx_get_client_id(struct pci_dev *pdev){	if (amdgpu_atpx_priv.dhandle == ACPI_HANDLE(&pdev->dev))		return VGA_SWITCHEROO_IGD;	else

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