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Release 4.11 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;
	
bool bridge_pm_usable;
	/* 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; }

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

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

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

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/** * 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; }

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/** * 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; }

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Alex Deucher78100.00%1100.00%
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/** * 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"); /* * Disable legacy PM methods only when pcie port PM is usable, * otherwise the device might fail to power off or power on. */ atpx->functions.power_cntl = !amdgpu_atpx_priv.bridge_pm_usable; 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; }

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Alex Deucher26998.18%583.33%
Peter Wu51.82%116.67%
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/** * 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; }

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Alex Deucher161100.00%1100.00%
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/** * 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; }

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Alex Deucher107100.00%2100.00%
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/** * 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; }

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Alex Deucher95100.00%1100.00%
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/** * 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; }

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Alex Deucher95100.00%1100.00%
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/** * 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; }

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Alex Deucher95100.00%1100.00%
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/** * 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; }

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Alex Deucher95100.00%1100.00%
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/** * 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; }

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/** * 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; }

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Alex Deucher37100.00%1100.00%
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/** * 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; }

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/** * 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; }

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/** * 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; }

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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; bool d3_supported = false; struct pci_dev *parent_pdev; while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) { vga_count++; has_atpx |= (amdgpu_atpx_pci_probe_handle(pdev) == true); parent_pdev = pci_upstream_bridge(pdev); d3_supported |= parent_pdev && parent_pdev->bridge_d3; } while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_OTHER << 8, pdev)) != NULL) { vga_count++; has_atpx |= (amdgpu_atpx_pci_probe_handle(pdev) == true); parent_pdev = pci_upstream_bridge(pdev); d3_supported |= parent_pdev && parent_pdev->bridge_d3; } 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_priv.bridge_pm_usable = d3_supported; amdgpu_atpx_init(); return true; } return false; }

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Alex Deucher16077.29%250.00%
Peter Wu4622.22%125.00%
Lukas Wunner10.48%125.00%
Total207100.00%4100.00%

/** * 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); }

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Alex Deucher2877.78%150.00%
Lukas Wunner822.22%150.00%
Total36100.00%2100.00%

/** * 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(); }

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Alex Deucher190696.70%857.14%
Peter Wu542.74%214.29%
Lukas Wunner100.51%321.43%
Rex Zhu10.05%17.14%
Total1971100.00%14100.00%
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