amdgpu_atpx_handler.c | Explore in Territory

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (c) 2010 Red Hat Inc.
 * Author : Dave Airlie <[email protected]>
 *
 * 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 "amdgpu.h"
#include "amd_acpi.h"

#define AMDGPU_PX_QUIRK_FORCE_ATPX …

struct amdgpu_px_quirk { … };

struct amdgpu_atpx_functions { … };

struct amdgpu_atpx { … };

static struct amdgpu_atpx_priv { … } amdgpu_atpx_priv;

struct atpx_verify_interface { … } __packed;

struct atpx_px_params { … } __packed;

struct atpx_power_control { … } __packed;

struct atpx_mux { … } __packed;

bool amdgpu_has_atpx(void)
{ … }

bool amdgpu_has_atpx_dgpu_power_cntl(void)
{ … }

bool amdgpu_is_atpx_hybrid(void)
{ … }

bool amdgpu_atpx_dgpu_req_power_for_displays(void)
{ … }

#if defined(CONFIG_ACPI)
void *amdgpu_atpx_get_dhandle(void)
{ … }
#endif

/**
 * 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)
{ … }

/**
 * 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)
{ … }

/**
 * amdgpu_atpx_validate - 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)
{ … }

/**
 * 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)
{ … }

/**
 * 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)
{ … }

/**
 * 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)
{ … }

/**
 * 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)
{ … }

/**
 * 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)
{ … }

/**
 * 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)
{ … }

/**
 * 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)
{ … }

/**
 * 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)
{ … }

/**
 * 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)
{ … }

/**
 * 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)
{ … }

/**
 * 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 enum vga_switcheroo_client_id amdgpu_atpx_get_client_id(struct pci_dev *pdev)
{ … }

static const struct vga_switcheroo_handler amdgpu_atpx_handler = …;

static const struct amdgpu_px_quirk amdgpu_px_quirk_list[] = …;

static void amdgpu_atpx_get_quirks(struct pci_dev *pdev)
{ … }

/**
 * 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)
{ … }

/**
 * amdgpu_register_atpx_handler - register with vga_switcheroo
 *
 * Register the PX callbacks with vga_switcheroo (all asics).
 */
void amdgpu_register_atpx_handler(void)
{ … }

/**
 * amdgpu_unregister_atpx_handler - unregister with vga_switcheroo
 *
 * Unregister the PX callbacks with vga_switcheroo (all asics).
 */
void amdgpu_unregister_atpx_handler(void)
{ … }
linux/drivers/gpu/drm/amd/amdgpu/amdgpu_atpx_handler.c
