diff options
Diffstat (limited to 'drivers/gpu/drm/amd/amdgpu/amdgpu_atpx_handler.c')
| -rw-r--r-- | drivers/gpu/drm/amd/amdgpu/amdgpu_atpx_handler.c | 572 |
1 files changed, 572 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_atpx_handler.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_atpx_handler.c new file mode 100644 index 000000000000..3f7aaa45bf8e --- /dev/null +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_atpx_handler.c @@ -0,0 +1,572 @@ +/* + * 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, + ¶ms); + 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, + ¶ms); + 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, + ¶ms); + 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, + ¶ms); + 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, + ¶ms); + 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 struct vga_switcheroo_handler amdgpu_atpx_handler = { + .switchto = amdgpu_atpx_switchto, + .power_state = amdgpu_atpx_power_state, + .init = amdgpu_atpx_init, + .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; + 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; + + /* 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); +} + +/** + * 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(); +} |