diff options
Diffstat (limited to 'drivers/gpu/drm/radeon/radeon_atpx_handler.c')
| -rw-r--r-- | drivers/gpu/drm/radeon/radeon_atpx_handler.c | 411 |
1 files changed, 336 insertions, 75 deletions
diff --git a/drivers/gpu/drm/radeon/radeon_atpx_handler.c b/drivers/gpu/drm/radeon/radeon_atpx_handler.c index 2a2cf0b88a28..582e99449c12 100644 --- a/drivers/gpu/drm/radeon/radeon_atpx_handler.c +++ b/drivers/gpu/drm/radeon/radeon_atpx_handler.c @@ -12,30 +12,62 @@ #include <acpi/acpi_bus.h> #include <linux/pci.h> -#define ATPX_VERSION 0 -#define ATPX_GPU_PWR 2 -#define ATPX_MUX_SELECT 3 -#define ATPX_I2C_MUX_SELECT 4 -#define ATPX_SWITCH_START 5 -#define ATPX_SWITCH_END 6 - -#define ATPX_INTEGRATED 0 -#define ATPX_DISCRETE 1 +#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; +}; -#define ATPX_MUX_IGD 0 -#define ATPX_MUX_DISCRETE 1 +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; - acpi_handle atpx_handle; + struct radeon_atpx atpx; } radeon_atpx_priv; -static int radeon_atpx_get_version(acpi_handle handle) +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_power_control { + u16 size; + u8 dgpu_state; +} __packed; + +struct atpx_mux { + u16 size; + u16 mux; +} __packed; + +/** + * 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], *obj; + union acpi_object atpx_arg_elements[2]; struct acpi_object_list atpx_arg; struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; @@ -43,99 +75,292 @@ static int radeon_atpx_get_version(acpi_handle handle) atpx_arg.pointer = &atpx_arg_elements[0]; atpx_arg_elements[0].type = ACPI_TYPE_INTEGER; - atpx_arg_elements[0].integer.value = ATPX_VERSION; + 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; + } - atpx_arg_elements[1].type = ACPI_TYPE_INTEGER; - atpx_arg_elements[1].integer.value = ATPX_VERSION; + status = acpi_evaluate_object(handle, "ATPX", &atpx_arg, &buffer); - status = acpi_evaluate_object(handle, NULL, &atpx_arg, &buffer); - if (ACPI_FAILURE(status)) { - printk("%s: failed to call ATPX: %s\n", __func__, acpi_format_exception(status)); - return -ENOSYS; + /* 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; } - obj = (union acpi_object *)buffer.pointer; - if (obj && (obj->type == ACPI_TYPE_BUFFER)) - printk(KERN_INFO "radeon atpx: version is %d\n", *((u8 *)(obj->buffer.pointer) + 2)); - kfree(buffer.pointer); - return 0; + + return buffer.pointer; } -static int radeon_atpx_execute(acpi_handle handle, int cmd_id, u16 value) +/** + * 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) { - acpi_status status; - union acpi_object atpx_arg_elements[2]; - struct acpi_object_list atpx_arg; - struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; - uint8_t buf[4] = {0}; - - if (!handle) - return -EINVAL; - - atpx_arg.count = 2; - atpx_arg.pointer = &atpx_arg_elements[0]; + 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; +} - atpx_arg_elements[0].type = ACPI_TYPE_INTEGER; - atpx_arg_elements[0].integer.value = cmd_id; +/** + * radeon_atpx_verify_interface - verify ATPX + * + * @handle: acpi handle + * @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: %lu\n", size); + err = -EINVAL; + goto out; + } + size = min(sizeof(output), size); - buf[2] = value & 0xff; - buf[3] = (value >> 8) & 0xff; + memcpy(&output, info->buffer.pointer, size); - atpx_arg_elements[1].type = ACPI_TYPE_BUFFER; - atpx_arg_elements[1].buffer.length = 4; - atpx_arg_elements[1].buffer.pointer = buf; + /* TODO: check version? */ + printk("ATPX version %u\n", output.version); - status = acpi_evaluate_object(handle, NULL, &atpx_arg, &buffer); - if (ACPI_FAILURE(status)) { - printk("%s: failed to call ATPX: %s\n", __func__, acpi_format_exception(status)); - return -ENOSYS; - } - kfree(buffer.pointer); + radeon_atpx_parse_functions(&atpx->functions, output.function_bits); - return 0; +out: + kfree(info); + return err; } -static int radeon_atpx_set_discrete_state(acpi_handle handle, int state) +/** + * 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) { - return radeon_atpx_execute(handle, ATPX_GPU_PWR, 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; } -static int radeon_atpx_switch_mux(acpi_handle handle, int mux_id) +/** + * 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) { - return radeon_atpx_execute(handle, ATPX_MUX_SELECT, 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; } -static int radeon_atpx_switch_i2c_mux(acpi_handle handle, int mux_id) +/** + * 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) { - return radeon_atpx_execute(handle, ATPX_I2C_MUX_SELECT, 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; } -static int radeon_atpx_switch_start(acpi_handle handle, int gpu_id) +/** + * 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) { - return radeon_atpx_execute(handle, ATPX_SWITCH_START, gpu_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; } -static int radeon_atpx_switch_end(acpi_handle handle, int gpu_id) +/** + * 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) { - return radeon_atpx_execute(handle, ATPX_SWITCH_END, gpu_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) { - int gpu_id; + u16 gpu_id; if (id == VGA_SWITCHEROO_IGD) - gpu_id = ATPX_INTEGRATED; + gpu_id = ATPX_INTEGRATED_GPU; else - gpu_id = ATPX_DISCRETE; + gpu_id = ATPX_DISCRETE_GPU; - radeon_atpx_switch_start(radeon_atpx_priv.atpx_handle, gpu_id); - radeon_atpx_switch_mux(radeon_atpx_priv.atpx_handle, gpu_id); - radeon_atpx_switch_i2c_mux(radeon_atpx_priv.atpx_handle, gpu_id); - radeon_atpx_switch_end(radeon_atpx_priv.atpx_handle, gpu_id); + 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_switchto - switch to the requested GPU + * + * @id: GPU to switch to + * @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) { @@ -143,10 +368,18 @@ static int radeon_atpx_power_state(enum vga_switcheroo_client_id id, if (id == VGA_SWITCHEROO_IGD) return 0; - radeon_atpx_set_discrete_state(radeon_atpx_priv.atpx_handle, state); + radeon_atpx_set_discrete_state(&radeon_atpx_priv.atpx, state); return 0; } +/** + * radeon_atpx_pci_probe_handle - look up the ATRM and ATPX handles + * + * @pdev: pci device + * + * Look up the ATPX and ATRM 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; @@ -161,18 +394,30 @@ static bool radeon_atpx_pci_probe_handle(struct pci_dev *pdev) return false; radeon_atpx_priv.dhandle = dhandle; - radeon_atpx_priv.atpx_handle = atpx_handle; + 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) { /* set up the ATPX handle */ - - radeon_atpx_get_version(radeon_atpx_priv.atpx_handle); - return 0; + return radeon_atpx_verify_interface(&radeon_atpx_priv.atpx); } +/** + * 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 == DEVICE_ACPI_HANDLE(&pdev->dev)) @@ -188,6 +433,12 @@ static struct vga_switcheroo_handler radeon_atpx_handler = { .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 }; @@ -203,7 +454,7 @@ static bool radeon_atpx_detect(void) } if (has_atpx && vga_count == 2) { - acpi_get_name(radeon_atpx_priv.atpx_handle, ACPI_FULL_PATHNAME, &buffer); + 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; @@ -212,6 +463,11 @@ static bool radeon_atpx_detect(void) 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; @@ -224,6 +480,11 @@ void radeon_register_atpx_handler(void) 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(); 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