diff options
Diffstat (limited to 'include/linux/vga_switcheroo.h')
| -rw-r--r-- | include/linux/vga_switcheroo.h | 199 |
1 files changed, 199 insertions, 0 deletions
diff --git a/include/linux/vga_switcheroo.h b/include/linux/vga_switcheroo.h new file mode 100644 index 000000000..7e6ac0114 --- /dev/null +++ b/include/linux/vga_switcheroo.h @@ -0,0 +1,199 @@ +/* + * vga_switcheroo.h - Support for laptop with dual GPU using one set of outputs + * + * Copyright (c) 2010 Red Hat Inc. + * Author : Dave Airlie <airlied@redhat.com> + * + * Copyright (c) 2015 Lukas Wunner <lukas@wunner.de> + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice (including the next + * paragraph) shall be included in all copies or substantial portions of the + * Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER + * DEALINGS + * IN THE SOFTWARE. + * + */ + +#ifndef _LINUX_VGA_SWITCHEROO_H_ +#define _LINUX_VGA_SWITCHEROO_H_ + +#include <linux/fb.h> + +struct pci_dev; + +/** + * enum vga_switcheroo_handler_flags_t - handler flags bitmask + * @VGA_SWITCHEROO_CAN_SWITCH_DDC: whether the handler is able to switch the + * DDC lines separately. This signals to clients that they should call + * drm_get_edid_switcheroo() to probe the EDID + * @VGA_SWITCHEROO_NEEDS_EDP_CONFIG: whether the handler is unable to switch + * the AUX channel separately. This signals to clients that the active + * GPU needs to train the link and communicate the link parameters to the + * inactive GPU (mediated by vga_switcheroo). The inactive GPU may then + * skip the AUX handshake and set up its output with these pre-calibrated + * values (DisplayPort specification v1.1a, section 2.5.3.3) + * + * Handler flags bitmask. Used by handlers to declare their capabilities upon + * registering with vga_switcheroo. + */ +enum vga_switcheroo_handler_flags_t { + VGA_SWITCHEROO_CAN_SWITCH_DDC = (1 << 0), + VGA_SWITCHEROO_NEEDS_EDP_CONFIG = (1 << 1), +}; + +/** + * enum vga_switcheroo_state - client power state + * @VGA_SWITCHEROO_OFF: off + * @VGA_SWITCHEROO_ON: on + * @VGA_SWITCHEROO_NOT_FOUND: client has not registered with vga_switcheroo. + * Only used in vga_switcheroo_get_client_state() which in turn is only + * called from hda_intel.c + * + * Client power state. + */ +enum vga_switcheroo_state { + VGA_SWITCHEROO_OFF, + VGA_SWITCHEROO_ON, + /* below are referred only from vga_switcheroo_get_client_state() */ + VGA_SWITCHEROO_NOT_FOUND, +}; + +/** + * enum vga_switcheroo_client_id - client identifier + * @VGA_SWITCHEROO_UNKNOWN_ID: initial identifier assigned to vga clients. + * Determining the id requires the handler, so GPUs are given their + * true id in a delayed fashion in vga_switcheroo_enable() + * @VGA_SWITCHEROO_IGD: integrated graphics device + * @VGA_SWITCHEROO_DIS: discrete graphics device + * @VGA_SWITCHEROO_MAX_CLIENTS: currently no more than two GPUs are supported + * + * Client identifier. Audio clients use the same identifier & 0x100. + */ +enum vga_switcheroo_client_id { + VGA_SWITCHEROO_UNKNOWN_ID = 0x1000, + VGA_SWITCHEROO_IGD = 0, + VGA_SWITCHEROO_DIS, + VGA_SWITCHEROO_MAX_CLIENTS, +}; + +/** + * struct vga_switcheroo_handler - handler callbacks + * @init: initialize handler. + * Optional. This gets called when vga_switcheroo is enabled, i.e. when + * two vga clients have registered. It allows the handler to perform + * some delayed initialization that depends on the existence of the + * vga clients. Currently only the radeon and amdgpu drivers use this. + * The return value is ignored + * @switchto: switch outputs to given client. + * Mandatory. For muxless machines this should be a no-op. Returning 0 + * denotes success, anything else failure (in which case the switch is + * aborted) + * @switch_ddc: switch DDC lines to given client. + * Optional. Should return the previous DDC owner on success or a + * negative int on failure + * @power_state: cut or reinstate power of given client. + * Optional. The return value is ignored + * @get_client_id: determine if given pci device is integrated or discrete GPU. + * Mandatory + * + * Handler callbacks. The multiplexer itself. The @switchto and @get_client_id + * methods are mandatory, all others may be set to NULL. + */ +struct vga_switcheroo_handler { + int (*init)(void); + int (*switchto)(enum vga_switcheroo_client_id id); + int (*switch_ddc)(enum vga_switcheroo_client_id id); + int (*power_state)(enum vga_switcheroo_client_id id, + enum vga_switcheroo_state state); + enum vga_switcheroo_client_id (*get_client_id)(struct pci_dev *pdev); +}; + +/** + * struct vga_switcheroo_client_ops - client callbacks + * @set_gpu_state: do the equivalent of suspend/resume for the card. + * Mandatory. This should not cut power to the discrete GPU, + * which is the job of the handler + * @reprobe: poll outputs. + * Optional. This gets called after waking the GPU and switching + * the outputs to it + * @can_switch: check if the device is in a position to switch now. + * Mandatory. The client should return false if a user space process + * has one of its device files open + * @gpu_bound: notify the client id to audio client when the GPU is bound. + * + * Client callbacks. A client can be either a GPU or an audio device on a GPU. + * The @set_gpu_state and @can_switch methods are mandatory, @reprobe may be + * set to NULL. For audio clients, the @reprobe member is bogus. + * OTOH, @gpu_bound is only for audio clients, and not used for GPU clients. + */ +struct vga_switcheroo_client_ops { + void (*set_gpu_state)(struct pci_dev *dev, enum vga_switcheroo_state); + void (*reprobe)(struct pci_dev *dev); + bool (*can_switch)(struct pci_dev *dev); + void (*gpu_bound)(struct pci_dev *dev, enum vga_switcheroo_client_id); +}; + +#if defined(CONFIG_VGA_SWITCHEROO) +void vga_switcheroo_unregister_client(struct pci_dev *dev); +int vga_switcheroo_register_client(struct pci_dev *dev, + const struct vga_switcheroo_client_ops *ops, + bool driver_power_control); +int vga_switcheroo_register_audio_client(struct pci_dev *pdev, + const struct vga_switcheroo_client_ops *ops, + struct pci_dev *vga_dev); + +void vga_switcheroo_client_fb_set(struct pci_dev *dev, + struct fb_info *info); + +int vga_switcheroo_register_handler(const struct vga_switcheroo_handler *handler, + enum vga_switcheroo_handler_flags_t handler_flags); +void vga_switcheroo_unregister_handler(void); +enum vga_switcheroo_handler_flags_t vga_switcheroo_handler_flags(void); +int vga_switcheroo_lock_ddc(struct pci_dev *pdev); +int vga_switcheroo_unlock_ddc(struct pci_dev *pdev); + +int vga_switcheroo_process_delayed_switch(void); + +bool vga_switcheroo_client_probe_defer(struct pci_dev *pdev); +enum vga_switcheroo_state vga_switcheroo_get_client_state(struct pci_dev *dev); + +int vga_switcheroo_init_domain_pm_ops(struct device *dev, struct dev_pm_domain *domain); +void vga_switcheroo_fini_domain_pm_ops(struct device *dev); +#else + +static inline void vga_switcheroo_unregister_client(struct pci_dev *dev) {} +static inline int vga_switcheroo_register_client(struct pci_dev *dev, + const struct vga_switcheroo_client_ops *ops, bool driver_power_control) { return 0; } +static inline void vga_switcheroo_client_fb_set(struct pci_dev *dev, struct fb_info *info) {} +static inline int vga_switcheroo_register_handler(const struct vga_switcheroo_handler *handler, + enum vga_switcheroo_handler_flags_t handler_flags) { return 0; } +static inline int vga_switcheroo_register_audio_client(struct pci_dev *pdev, + const struct vga_switcheroo_client_ops *ops, + struct pci_dev *vga_dev) { return 0; } +static inline void vga_switcheroo_unregister_handler(void) {} +static inline enum vga_switcheroo_handler_flags_t vga_switcheroo_handler_flags(void) { return 0; } +static inline int vga_switcheroo_lock_ddc(struct pci_dev *pdev) { return -ENODEV; } +static inline int vga_switcheroo_unlock_ddc(struct pci_dev *pdev) { return -ENODEV; } +static inline int vga_switcheroo_process_delayed_switch(void) { return 0; } +static inline bool vga_switcheroo_client_probe_defer(struct pci_dev *pdev) { return false; } +static inline enum vga_switcheroo_state vga_switcheroo_get_client_state(struct pci_dev *dev) { return VGA_SWITCHEROO_ON; } + +static inline int vga_switcheroo_init_domain_pm_ops(struct device *dev, struct dev_pm_domain *domain) { return -EINVAL; } +static inline void vga_switcheroo_fini_domain_pm_ops(struct device *dev) {} + +#endif +#endif /* _LINUX_VGA_SWITCHEROO_H_ */ |