[linux-2.6-block.git] / drivers / gpu / drm / amd / amdgpu / amdgpu_atpx_handler.c

/*
 * 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 "amd_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;
	bool is_hybrid;
	bool dgpu_req_power_for_displays;
};

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;
}

bool amdgpu_has_atpx_dgpu_power_cntl(void) {
	return amdgpu_atpx_priv.atpx.functions.power_cntl;
}

bool amdgpu_is_atpx_hybrid(void) {
	return amdgpu_atpx_priv.atpx.is_hybrid;
}

bool amdgpu_atpx_dgpu_req_power_for_displays(void) {
	return amdgpu_atpx_priv.atpx.dgpu_req_power_for_displays;
}

/**
 * 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)
{
	u32 valid_bits = 0;

	if (atpx->functions.px_params) {
		union acpi_object *info;
		struct atpx_px_params output;
		size_t size;

		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;

		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");
		atpx->functions.power_cntl = false;
		atpx->is_hybrid = true;
	}

	atpx->dgpu_req_power_for_displays = false;
	if (valid_bits & ATPX_DGPU_REQ_POWER_FOR_DISPLAYS)
		atpx->dgpu_req_power_for_displays = true;

	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);

		/* 200ms delay is required after off */
		if (state == 0)
			msleep(200);
	}
	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
		return VGA_SWITCHEROO_DIS;
}

static const struct vga_switcheroo_handler amdgpu_atpx_handler = {
	.switchto = amdgpu_atpx_switchto,
	.power_state = amdgpu_atpx_power_state,
	.get_client_id = amdgpu_atpx_get_client_id,
};

/**
 * amdgpu_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 amdgpu_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 |= (amdgpu_atpx_pci_probe_handle(pdev) == true);
	}

	while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_OTHER << 8, pdev)) != NULL) {
		vga_count++;

		has_atpx |= (amdgpu_atpx_pci_probe_handle(pdev) == true);
	}

	if (has_atpx && vga_count == 2) {
		acpi_get_name(amdgpu_atpx_priv.atpx.handle, ACPI_FULL_PATHNAME, &buffer);
		printk(KERN_INFO "vga_switcheroo: detected switching method %s handle\n",
		       acpi_method_name);
		amdgpu_atpx_priv.atpx_detected = true;
		amdgpu_atpx_init();
		return true;
	}
	return false;
}

/**
 * amdgpu_register_atpx_handler - register with vga_switcheroo
 *
 * Register the PX callbacks with vga_switcheroo (all asics).
 */
void amdgpu_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 = amdgpu_atpx_detect();
	if (!r)
		return;

	vga_switcheroo_register_handler(&amdgpu_atpx_handler, handler_flags);
}

/**
 * amdgpu_unregister_atpx_handler - unregister with vga_switcheroo
 *
 * Unregister the PX callbacks with vga_switcheroo (all asics).
 */
void amdgpu_unregister_atpx_handler(void)
{
	vga_switcheroo_unregister_handler();
}
Commit	Line	Data
d38ceaf9 AD	1	/*
	2	* Copyright (c) 2010 Red Hat Inc.
	3	* Author : Dave Airlie <airlied@redhat.com>
	4	*
	5	* Licensed under GPLv2
	6	*
	7	* ATPX support for both Intel/ATI
	8	*/
	9	#include <linux/vga_switcheroo.h>
	10	#include <linux/slab.h>
	11	#include <linux/acpi.h>
	12	#include <linux/pci.h>
f81eb1a3	13	#include <linux/delay.h>
d38ceaf9	14
66dc0ddd	15	#include "amd_acpi.h"
d38ceaf9 AD	16
	17	struct amdgpu_atpx_functions {
	18	bool px_params;
	19	bool power_cntl;
	20	bool disp_mux_cntl;
	21	bool i2c_mux_cntl;
	22	bool switch_start;
	23	bool switch_end;
	24	bool disp_connectors_mapping;
	25	bool disp_detetion_ports;
	26	};
	27
	28	struct amdgpu_atpx {
	29	acpi_handle handle;
	30	struct amdgpu_atpx_functions functions;
2f5af82e	31	bool is_hybrid;
efc83cf4	32	bool dgpu_req_power_for_displays;
d38ceaf9 AD	33	};
	34
	35	static struct amdgpu_atpx_priv {
	36	bool atpx_detected;
	37	/* handle for device - and atpx */
	38	acpi_handle dhandle;
	39	acpi_handle other_handle;
	40	struct amdgpu_atpx atpx;
	41	} amdgpu_atpx_priv;
	42
	43	struct atpx_verify_interface {
	44	u16 size; /* structure size in bytes (includes size field) */
	45	u16 version; /* version */
	46	u32 function_bits; /* supported functions bit vector */
	47	} __packed;
	48
	49	struct atpx_px_params {
	50	u16 size; /* structure size in bytes (includes size field) */
	51	u32 valid_flags; /* which flags are valid */
	52	u32 flags; /* flags */
	53	} __packed;
	54
	55	struct atpx_power_control {
	56	u16 size;
	57	u8 dgpu_state;
	58	} __packed;
	59
	60	struct atpx_mux {
	61	u16 size;
	62	u16 mux;
	63	} __packed;
	64
	65	bool amdgpu_has_atpx(void) {
	66	return amdgpu_atpx_priv.atpx_detected;
	67	}
	68
a78fe133 AD	69	bool amdgpu_has_atpx_dgpu_power_cntl(void) {
	70	return amdgpu_atpx_priv.atpx.functions.power_cntl;
	71	}
	72
2f5af82e AD	73	bool amdgpu_is_atpx_hybrid(void) {
	74	return amdgpu_atpx_priv.atpx.is_hybrid;
	75	}
	76
efc83cf4 AD	77	bool amdgpu_atpx_dgpu_req_power_for_displays(void) {
	78	return amdgpu_atpx_priv.atpx.dgpu_req_power_for_displays;
	79	}
	80
d38ceaf9 AD	81	/**
	82	* amdgpu_atpx_call - call an ATPX method
	83	*
	84	* @handle: acpi handle
	85	* @function: the ATPX function to execute
	86	* @params: ATPX function params
	87	*
	88	* Executes the requested ATPX function (all asics).
	89	* Returns a pointer to the acpi output buffer.
	90	*/
	91	static union acpi_object *amdgpu_atpx_call(acpi_handle handle, int function,
	92	struct acpi_buffer *params)
	93	{
	94	acpi_status status;
	95	union acpi_object atpx_arg_elements[2];
	96	struct acpi_object_list atpx_arg;
	97	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
	98
	99	atpx_arg.count = 2;
	100	atpx_arg.pointer = &atpx_arg_elements[0];
	101
	102	atpx_arg_elements[0].type = ACPI_TYPE_INTEGER;
	103	atpx_arg_elements[0].integer.value = function;
	104
	105	if (params) {
	106	atpx_arg_elements[1].type = ACPI_TYPE_BUFFER;
	107	atpx_arg_elements[1].buffer.length = params->length;
	108	atpx_arg_elements[1].buffer.pointer = params->pointer;
	109	} else {
	110	/* We need a second fake parameter */
	111	atpx_arg_elements[1].type = ACPI_TYPE_INTEGER;
	112	atpx_arg_elements[1].integer.value = 0;
	113	}
	114
	115	status = acpi_evaluate_object(handle, NULL, &atpx_arg, &buffer);
	116
	117	/* Fail only if calling the method fails and ATPX is supported */
	118	if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
	119	printk("failed to evaluate ATPX got %s\n",
	120	acpi_format_exception(status));
	121	kfree(buffer.pointer);
	122	return NULL;
	123	}
	124
	125	return buffer.pointer;
	126	}
	127
	128	/**
	129	* amdgpu_atpx_parse_functions - parse supported functions
	130	*
	131	* @f: supported functions struct
	132	* @mask: supported functions mask from ATPX
	133	*
	134	* Use the supported functions mask from ATPX function
	135	* ATPX_FUNCTION_VERIFY_INTERFACE to determine what functions
	136	* are supported (all asics).
	137	*/
	138	static void amdgpu_atpx_parse_functions(struct amdgpu_atpx_functions *f, u32 mask)
	139	{
	140	f->px_params = mask & ATPX_GET_PX_PARAMETERS_SUPPORTED;
	141	f->power_cntl = mask & ATPX_POWER_CONTROL_SUPPORTED;
	142	f->disp_mux_cntl = mask & ATPX_DISPLAY_MUX_CONTROL_SUPPORTED;
	143	f->i2c_mux_cntl = mask & ATPX_I2C_MUX_CONTROL_SUPPORTED;
	144	f->switch_start = mask & ATPX_GRAPHICS_DEVICE_SWITCH_START_NOTIFICATION_SUPPORTED;
145	f->switch_end = mask & ATPX_GRAPHICS_DEVICE_SWITCH_END_NOTIFICATION_SUPPORTED;
146	f->disp_connectors_mapping = mask & ATPX_GET_DISPLAY_CONNECTORS_MAPPING_SUPPORTED;
147	f->disp_detetion_ports = mask & ATPX_GET_DISPLAY_DETECTION_PORTS_SUPPORTED;
148	}
149
150	/**
151	* amdgpu_atpx_validate_functions - validate ATPX functions
152	*
153	* @atpx: amdgpu atpx struct
154	*
155	* Validate that required functions are enabled (all asics).
156	* returns 0 on success, error on failure.
157	*/
158	static int amdgpu_atpx_validate(struct amdgpu_atpx *atpx)
159	{
8d45f80e	160	u32 valid_bits = 0;
e9bef455	161
d38ceaf9 AD	162	if (atpx->functions.px_params) {
	163	union acpi_object *info;
	164	struct atpx_px_params output;
	165	size_t size;
d38ceaf9 AD	166
	167	info = amdgpu_atpx_call(atpx->handle, ATPX_FUNCTION_GET_PX_PARAMETERS, NULL);
	168	if (!info)
	169	return -EIO;
	170
	171	memset(&output, 0, sizeof(output));
	172
	173	size = (u16 ) info->buffer.pointer;
	174	if (size < 10) {
	175	printk("ATPX buffer is too small: %zu\n", size);
	176	kfree(info);
	177	return -EINVAL;
	178	}
	179	size = min(sizeof(output), size);
	180
	181	memcpy(&output, info->buffer.pointer, size);
	182
	183	valid_bits = output.flags & output.valid_flags;
5c614792	184
d38ceaf9 AD	185	kfree(info);
d38ceaf9 AD	186	}
8d45f80e AD	187
	188	/* if separate mux flag is set, mux controls are required */
	189	if (valid_bits & ATPX_SEPARATE_MUX_FOR_I2C) {
	190	atpx->functions.i2c_mux_cntl = true;
	191	atpx->functions.disp_mux_cntl = true;
	192	}
	193	/* if any outputs are muxed, mux controls are required */
	194	if (valid_bits & (ATPX_CRT1_RGB_SIGNAL_MUXED \|
	195	ATPX_TV_SIGNAL_MUXED \|
	196	ATPX_DFP_SIGNAL_MUXED))
	197	atpx->functions.disp_mux_cntl = true;
	198
	199
	200	/* some bioses set these bits rather than flagging power_cntl as supported */
	201	if (valid_bits & (ATPX_DYNAMIC_PX_SUPPORTED \|
	202	ATPX_DYNAMIC_DGPU_POWER_OFF_SUPPORTED))
	203	atpx->functions.power_cntl = true;
	204
2f5af82e	205	atpx->is_hybrid = false;
8d45f80e	206	if (valid_bits & ATPX_MS_HYBRID_GFX_SUPPORTED) {
2f5af82e	207	printk("ATPX Hybrid Graphics\n");
8d45f80e	208	atpx->functions.power_cntl = false;
2f5af82e	209	atpx->is_hybrid = true;
8d45f80e AD	210	}
8d45f80e AD	211
efc83cf4 AD	212	atpx->dgpu_req_power_for_displays = false;
	213	if (valid_bits & ATPX_DGPU_REQ_POWER_FOR_DISPLAYS)
	214	atpx->dgpu_req_power_for_displays = true;
	215
d38ceaf9 AD	216	return 0;
	217	}
	218
	219	/**
	220	* amdgpu_atpx_verify_interface - verify ATPX
	221	*
	222	* @atpx: amdgpu atpx struct
	223	*
	224	* Execute the ATPX_FUNCTION_VERIFY_INTERFACE ATPX function
	225	* to initialize ATPX and determine what features are supported
	226	* (all asics).
	227	* returns 0 on success, error on failure.
	228	*/
	229	static int amdgpu_atpx_verify_interface(struct amdgpu_atpx *atpx)
	230	{
	231	union acpi_object *info;
	232	struct atpx_verify_interface output;
	233	size_t size;
	234	int err = 0;
	235
	236	info = amdgpu_atpx_call(atpx->handle, ATPX_FUNCTION_VERIFY_INTERFACE, NULL);
	237	if (!info)
	238	return -EIO;
	239
	240	memset(&output, 0, sizeof(output));
	241
	242	size = (u16 ) info->buffer.pointer;
	243	if (size < 8) {
	244	printk("ATPX buffer is too small: %zu\n", size);
	245	err = -EINVAL;
	246	goto out;
	247	}
	248	size = min(sizeof(output), size);
	249
	250	memcpy(&output, info->buffer.pointer, size);
	251
	252	/* TODO: check version? */
	253	printk("ATPX version %u, functions 0x%08x\n",
	254	output.version, output.function_bits);
	255
	256	amdgpu_atpx_parse_functions(&atpx->functions, output.function_bits);
	257
	258	out:
	259	kfree(info);
	260	return err;
	261	}
	262
	263	/**
	264	* amdgpu_atpx_set_discrete_state - power up/down discrete GPU
	265	*
	266	* @atpx: atpx info struct
	267	* @state: discrete GPU state (0 = power down, 1 = power up)
	268	*
	269	* Execute the ATPX_FUNCTION_POWER_CONTROL ATPX function to
	270	* power down/up the discrete GPU (all asics).
	271	* Returns 0 on success, error on failure.
	272	*/
	273	static int amdgpu_atpx_set_discrete_state(struct amdgpu_atpx *atpx, u8 state)
	274	{
	275	struct acpi_buffer params;
	276	union acpi_object *info;
	277	struct atpx_power_control input;
	278
	279	if (atpx->functions.power_cntl) {
280	input.size = 3;
281	input.dgpu_state = state;
282	params.length = input.size;
283	params.pointer = &input;
284	info = amdgpu_atpx_call(atpx->handle,
285	ATPX_FUNCTION_POWER_CONTROL,
286	&params);
287	if (!info)
288	return -EIO;
289	kfree(info);
f81eb1a3 AD	290
	291	/* 200ms delay is required after off */
	292	if (state == 0)
	293	msleep(200);
d38ceaf9 AD	294	}
	295	return 0;
	296	}
	297
	298	/**
	299	* amdgpu_atpx_switch_disp_mux - switch display mux
	300	*
	301	* @atpx: atpx info struct
	302	* @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU)
	303	*
	304	* Execute the ATPX_FUNCTION_DISPLAY_MUX_CONTROL ATPX function to
	305	* switch the display mux between the discrete GPU and integrated GPU
	306	* (all asics).
	307	* Returns 0 on success, error on failure.
	308	*/
	309	static int amdgpu_atpx_switch_disp_mux(struct amdgpu_atpx *atpx, u16 mux_id)
	310	{
	311	struct acpi_buffer params;
	312	union acpi_object *info;
	313	struct atpx_mux input;
	314
	315	if (atpx->functions.disp_mux_cntl) {
	316	input.size = 4;
	317	input.mux = mux_id;
	318	params.length = input.size;
	319	params.pointer = &input;
	320	info = amdgpu_atpx_call(atpx->handle,
	321	ATPX_FUNCTION_DISPLAY_MUX_CONTROL,
	322	&params);
	323	if (!info)
	324	return -EIO;
	325	kfree(info);
	326	}
	327	return 0;
	328	}
	329
	330	/**
	331	* amdgpu_atpx_switch_i2c_mux - switch i2c/hpd mux
	332	*
	333	* @atpx: atpx info struct
	334	* @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU)
	335	*
	336	* Execute the ATPX_FUNCTION_I2C_MUX_CONTROL ATPX function to
	337	* switch the i2c/hpd mux between the discrete GPU and integrated GPU
	338	* (all asics).
	339	* Returns 0 on success, error on failure.
	340	*/
	341	static int amdgpu_atpx_switch_i2c_mux(struct amdgpu_atpx *atpx, u16 mux_id)
	342	{
	343	struct acpi_buffer params;
	344	union acpi_object *info;
	345	struct atpx_mux input;
	346
	347	if (atpx->functions.i2c_mux_cntl) {
	348	input.size = 4;
	349	input.mux = mux_id;
	350	params.length = input.size;
	351	params.pointer = &input;
	352	info = amdgpu_atpx_call(atpx->handle,
	353	ATPX_FUNCTION_I2C_MUX_CONTROL,
	354	&params);
	355	if (!info)
	356	return -EIO;
	357	kfree(info);
358	}
359	return 0;
360	}
361
362	/**
363	* amdgpu_atpx_switch_start - notify the sbios of a GPU switch
364	*
365	* @atpx: atpx info struct
366	* @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU)
367	*
368	* Execute the ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_START_NOTIFICATION ATPX
369	* function to notify the sbios that a switch between the discrete GPU and
370	* integrated GPU has begun (all asics).
371	* Returns 0 on success, error on failure.
372	*/
373	static int amdgpu_atpx_switch_start(struct amdgpu_atpx *atpx, u16 mux_id)
374	{
375	struct acpi_buffer params;
376	union acpi_object *info;
377	struct atpx_mux input;
378
379	if (atpx->functions.switch_start) {
380	input.size = 4;
381	input.mux = mux_id;
382	params.length = input.size;
383	params.pointer = &input;
384	info = amdgpu_atpx_call(atpx->handle,
385	ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_START_NOTIFICATION,
386	&params);
387	if (!info)
388	return -EIO;
389	kfree(info);
390	}
391	return 0;
392	}
393
394	/**
395	* amdgpu_atpx_switch_end - notify the sbios of a GPU switch
396	*
397	* @atpx: atpx info struct
398	* @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU)
399	*
400	* Execute the ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_END_NOTIFICATION ATPX
401	* function to notify the sbios that a switch between the discrete GPU and
402	* integrated GPU has ended (all asics).
403	* Returns 0 on success, error on failure.
404	*/
405	static int amdgpu_atpx_switch_end(struct amdgpu_atpx *atpx, u16 mux_id)
406	{
407	struct acpi_buffer params;
408	union acpi_object *info;
409	struct atpx_mux input;
410
411	if (atpx->functions.switch_end) {
412	input.size = 4;
413	input.mux = mux_id;
414	params.length = input.size;
415	params.pointer = &input;
416	info = amdgpu_atpx_call(atpx->handle,
417	ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_END_NOTIFICATION,
418	&params);
419	if (!info)
420	return -EIO;
421	kfree(info);
422	}
423	return 0;
424	}
425
426	/**
427	* amdgpu_atpx_switchto - switch to the requested GPU
428	*
429	* @id: GPU to switch to
430	*
431	* Execute the necessary ATPX functions to switch between the discrete GPU and
432	* integrated GPU (all asics).
433	* Returns 0 on success, error on failure.
434	*/
435	static int amdgpu_atpx_switchto(enum vga_switcheroo_client_id id)
436	{
437	u16 gpu_id;
438
439	if (id == VGA_SWITCHEROO_IGD)
440	gpu_id = ATPX_INTEGRATED_GPU;
441	else
442	gpu_id = ATPX_DISCRETE_GPU;
443
444	amdgpu_atpx_switch_start(&amdgpu_atpx_priv.atpx, gpu_id);
445	amdgpu_atpx_switch_disp_mux(&amdgpu_atpx_priv.atpx, gpu_id);
446	amdgpu_atpx_switch_i2c_mux(&amdgpu_atpx_priv.atpx, gpu_id);
447	amdgpu_atpx_switch_end(&amdgpu_atpx_priv.atpx, gpu_id);
448
449	return 0;
450	}
451
452	/**
453	* amdgpu_atpx_power_state - power down/up the requested GPU
454	*
455	* @id: GPU to power down/up
456	* @state: requested power state (0 = off, 1 = on)
457	*
458	* Execute the necessary ATPX function to power down/up the discrete GPU
459	* (all asics).
460	* Returns 0 on success, error on failure.
461	*/
462	static int amdgpu_atpx_power_state(enum vga_switcheroo_client_id id,
463	enum vga_switcheroo_state state)
464	{
465	/* on w500 ACPI can't change intel gpu state */
466	if (id == VGA_SWITCHEROO_IGD)
467	return 0;
468
469	amdgpu_atpx_set_discrete_state(&amdgpu_atpx_priv.atpx, state);
470	return 0;
471	}
472
473	/**
474	* amdgpu_atpx_pci_probe_handle - look up the ATPX handle
475	*
476	* @pdev: pci device
477	*
478	* Look up the ATPX handles (all asics).
479	* Returns true if the handles are found, false if not.
480	*/
481	static bool amdgpu_atpx_pci_probe_handle(struct pci_dev *pdev)
482	{
483	acpi_handle dhandle, atpx_handle;
484	acpi_status status;
485
486	dhandle = ACPI_HANDLE(&pdev->dev);
487	if (!dhandle)
488	return false;
489
490	status = acpi_get_handle(dhandle, "ATPX", &atpx_handle);
491	if (ACPI_FAILURE(status)) {
492	amdgpu_atpx_priv.other_handle = dhandle;
493	return false;
494	}
495	amdgpu_atpx_priv.dhandle = dhandle;
496	amdgpu_atpx_priv.atpx.handle = atpx_handle;
497	return true;
498	}
499
500	/**
501	* amdgpu_atpx_init - verify the ATPX interface
502	*
503	* Verify the ATPX interface (all asics).
504	* Returns 0 on success, error on failure.
505	*/
506	static int amdgpu_atpx_init(void)
507	{
508	int r;
509
510	/* set up the ATPX handle */
511	r = amdgpu_atpx_verify_interface(&amdgpu_atpx_priv.atpx);
512	if (r)
513	return r;
514
515	/* validate the atpx setup */
516	r = amdgpu_atpx_validate(&amdgpu_atpx_priv.atpx);
517	if (r)
518	return r;
519
520	return 0;
521	}
522
523	/**
524	* amdgpu_atpx_get_client_id - get the client id
525	*
526	* @pdev: pci device
527	*
528	* look up whether we are the integrated or discrete GPU (all asics).
529	* Returns the client id.
530	*/
531	static int amdgpu_atpx_get_client_id(struct pci_dev *pdev)
532	{
533	if (amdgpu_atpx_priv.dhandle == ACPI_HANDLE(&pdev->dev))
534	return VGA_SWITCHEROO_IGD;
535	else
536	return VGA_SWITCHEROO_DIS;
537	}
538
5d170139	539	static const struct vga_switcheroo_handler amdgpu_atpx_handler = {
d38ceaf9 AD	540	.switchto = amdgpu_atpx_switchto,
d38ceaf9 AD	541	.power_state = amdgpu_atpx_power_state,
d38ceaf9 AD	542	.get_client_id = amdgpu_atpx_get_client_id,
	543	};
	544
	545	/**
	546	* amdgpu_atpx_detect - detect whether we have PX
	547	*
	548	* Check if we have a PX system (all asics).
	549	* Returns true if we have a PX system, false if not.
	550	*/
	551	static bool amdgpu_atpx_detect(void)
	552	{
	553	char acpi_method_name[255] = { 0 };
	554	struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
	555	struct pci_dev *pdev = NULL;
	556	bool has_atpx = false;
	557	int vga_count = 0;
	558
	559	while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
	560	vga_count++;
	561
	562	has_atpx \|= (amdgpu_atpx_pci_probe_handle(pdev) == true);
	563	}
	564
	565	while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_OTHER << 8, pdev)) != NULL) {
	566	vga_count++;
	567
	568	has_atpx \|= (amdgpu_atpx_pci_probe_handle(pdev) == true);
	569	}
	570
	571	if (has_atpx && vga_count == 2) {
	572	acpi_get_name(amdgpu_atpx_priv.atpx.handle, ACPI_FULL_PATHNAME, &buffer);
1694467b	573	printk(KERN_INFO "vga_switcheroo: detected switching method %s handle\n",
d38ceaf9 AD	574	acpi_method_name);
d38ceaf9 AD	575	amdgpu_atpx_priv.atpx_detected = true;
6b1095ee	576	amdgpu_atpx_init();
d38ceaf9 AD	577	return true;
	578	}
	579	return false;
	580	}
	581
	582	/**
	583	* amdgpu_register_atpx_handler - register with vga_switcheroo
	584	*
	585	* Register the PX callbacks with vga_switcheroo (all asics).
	586	*/
	587	void amdgpu_register_atpx_handler(void)
	588	{
	589	bool r;
156d7d41	590	enum vga_switcheroo_handler_flags_t handler_flags = 0;
d38ceaf9 AD	591
	592	/* detect if we have any ATPX + 2 VGA in the system */
	593	r = amdgpu_atpx_detect();
	594	if (!r)
	595	return;
	596
156d7d41	597	vga_switcheroo_register_handler(&amdgpu_atpx_handler, handler_flags);
d38ceaf9 AD	598	}
	599
	600	/**
	601	* amdgpu_unregister_atpx_handler - unregister with vga_switcheroo
	602	*
	603	* Unregister the PX callbacks with vga_switcheroo (all asics).
	604	*/
	605	void amdgpu_unregister_atpx_handler(void)
	606	{
	607	vga_switcheroo_unregister_handler();
	608	}