/*
* 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 "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_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;
}
/**
* 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)
{
/* 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 = 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;
/* 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;
}
/**
* 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);
}
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 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;
/* 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();
}
